# -*- coding: utf-8 -*-
"""云服务器价格对比 - Flask 应用"""
import io
from datetime import datetime, timezone
from urllib.parse import urlencode
from flask import Flask, render_template, jsonify, request, redirect, url_for, session, send_file
from werkzeug.middleware.proxy_fix import ProxyFix
from sqlalchemy import text, func, or_
from config import Config
from extensions import db
from openpyxl import Workbook
from openpyxl import load_workbook

app = Flask(__name__)
app.config.from_object(Config)
# 部署在 Nginx 等反向代理后时，信任 X-Forwarded-* 头（HTTPS、真实 IP）
app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1)
db.init_app(app)

from models import (
    VPSPlan,
    Provider,
    PriceHistory,
    User,
    ForumPost,
    ForumComment,
    ForumCategory,
    ForumReport,
    ForumNotification,
    ForumPostLike,
    ForumPostBookmark,
)  # noqa: E402


def _ensure_mysql_columns():
    """为已有 MySQL 表添加缺失列，避免 1054 Unknown column。"""
    try:
        engine = db.engine
        if engine.dialect.name != "mysql":
            return
        with engine.connect() as conn:
            for col, spec in [
                ("traffic", "VARCHAR(64) NULL"),
                ("countries", "VARCHAR(255) NULL"),
                ("provider_id", "INT NULL"),
            ]:
                try:
                    conn.execute(text("ALTER TABLE vps_plans ADD COLUMN {} {}".format(col, spec)))
                    conn.commit()
                except Exception:
                    conn.rollback()
            for col, spec in [
                ("name", "VARCHAR(128) NULL"),
                ("region", "VARCHAR(128) NULL"),
                ("price_cny", "DOUBLE NULL"),
                ("price_usd", "DOUBLE NULL"),
            ]:
                try:
                    conn.execute(text("ALTER TABLE vps_plans MODIFY COLUMN {} {}".format(col, spec)))
                    conn.commit()
                except Exception:
                    conn.rollback()
    except Exception:
        pass  # 表不存在或非 MySQL 时忽略


def _ensure_forum_columns():
    """为已有论坛表补齐后续新增字段。"""
    try:
        engine = db.engine
        dialect = engine.dialect.name
        with engine.connect() as conn:
            if dialect == "mysql":
                alters = [
                    "ALTER TABLE forum_posts ADD COLUMN category VARCHAR(32) NOT NULL DEFAULT '综合讨论'",
                    "ALTER TABLE forum_posts ADD COLUMN view_count INT NOT NULL DEFAULT 0",
                ]
            else:
                alters = [
                    "ALTER TABLE forum_posts ADD COLUMN category TEXT DEFAULT '综合讨论'",
                    "ALTER TABLE forum_posts ADD COLUMN view_count INTEGER DEFAULT 0",
                ]
            for sql in alters:
                try:
                    conn.execute(text(sql))
                    conn.commit()
                except Exception:
                    conn.rollback()
    except Exception:
        pass


def _ensure_forum_manage_columns():
    """为用户与论坛帖子补齐管理字段（封禁/置顶/精华/锁帖）。"""
    try:
        engine = db.engine
        dialect = engine.dialect.name
        with engine.connect() as conn:
            if dialect == "mysql":
                alters = [
                    "ALTER TABLE users ADD COLUMN is_banned TINYINT(1) NOT NULL DEFAULT 0",
                    "ALTER TABLE users ADD COLUMN banned_at DATETIME NULL",
                    "ALTER TABLE users ADD COLUMN banned_reason VARCHAR(255) NULL",
                    "ALTER TABLE forum_posts ADD COLUMN is_pinned TINYINT(1) NOT NULL DEFAULT 0",
                    "ALTER TABLE forum_posts ADD COLUMN is_featured TINYINT(1) NOT NULL DEFAULT 0",
                    "ALTER TABLE forum_posts ADD COLUMN is_locked TINYINT(1) NOT NULL DEFAULT 0",
                ]
            else:
                alters = [
                    "ALTER TABLE users ADD COLUMN is_banned INTEGER DEFAULT 0",
                    "ALTER TABLE users ADD COLUMN banned_at DATETIME",
                    "ALTER TABLE users ADD COLUMN banned_reason TEXT",
                    "ALTER TABLE forum_posts ADD COLUMN is_pinned INTEGER DEFAULT 0",
                    "ALTER TABLE forum_posts ADD COLUMN is_featured INTEGER DEFAULT 0",
                    "ALTER TABLE forum_posts ADD COLUMN is_locked INTEGER DEFAULT 0",
                ]
            for sql in alters:
                try:
                    conn.execute(text(sql))
                    conn.commit()
                except Exception:
                    conn.rollback()
    except Exception:
        pass


DEFAULT_FORUM_CATEGORIES = [
    "综合讨论",
    "VPS 评测",
    "优惠活动",
    "运维经验",
    "新手提问",
]


def _ensure_forum_categories_seed():
    """初始化论坛默认分类。"""
    try:
        if ForumCategory.query.count() > 0:
            return
        for idx, name in enumerate(DEFAULT_FORUM_CATEGORIES, start=1):
            db.session.add(ForumCategory(
                name=name,
                sort_order=idx * 10,
                is_active=True,
            ))
        db.session.commit()
    except Exception:
        db.session.rollback()


def _ensure_price_history_baseline():
    """为历史数据补首条价格快照，便于后续计算涨跌。"""
    try:
        missing = (
            db.session.query(VPSPlan)
            .outerjoin(PriceHistory, PriceHistory.plan_id == VPSPlan.id)
            .filter(PriceHistory.id.is_(None))
            .all()
        )
        if not missing:
            return
        for p in missing:
            if p.price_cny is None and p.price_usd is None:
                continue
            db.session.add(PriceHistory(
                plan_id=p.id,
                price_cny=p.price_cny,
                price_usd=p.price_usd,
                currency=(p.currency or "CNY"),
                source="bootstrap",
            ))
        db.session.commit()
    except Exception:
        db.session.rollback()


# 启动时自动创建表（若不存在），并为已有表补列
with app.app_context():
    db.create_all()
    _ensure_mysql_columns()
    _ensure_forum_columns()
    _ensure_forum_manage_columns()
    _ensure_forum_categories_seed()
    _ensure_price_history_baseline()

ADMIN_PASSWORD = app.config["ADMIN_PASSWORD"]
SITE_URL = app.config["SITE_URL"]
SITE_NAME = app.config["SITE_NAME"]

# 国家/区域标签，供后台表单选择
COUNTRY_TAGS = [
    "中国大陆", "中国香港", "中国台湾", "美国", "日本", "新加坡", "韩国",
    "德国", "英国", "法国", "荷兰", "加拿大", "澳大利亚", "印度", "其他",
]

PRICE_SOURCE_LABELS = {
    "manual": "手工编辑",
    "import": "Excel 导入",
    "bootstrap": "基线",
}

FORUM_REPORT_REASONS = [
    "垃圾广告",
    "辱骂攻击",
    "违法违规",
    "虚假信息",
    "其他",
]

FORUM_REPORT_STATUS_LABELS = {
    "pending": "待处理",
    "processed": "已处理",
    "rejected": "已驳回",
}

FORUM_NOTIFICATION_TYPE_LABELS = {
    "post_commented": "帖子新评论",
    "thread_replied": "主题新回复",
    "report_processed": "举报处理结果",
    "content_removed": "内容处理通知",
}


def _get_current_user():
    user_id = session.get("user_id")
    if not user_id:
        return None
    user = db.session.get(User, user_id)
    if not user:
        session.pop("user_id", None)
    return user


def _is_banned_user(user):
    return bool(user and bool(user.is_banned))


def _user_ban_message(user):
    if not user:
        return "账号状态异常"
    reason = (user.banned_reason or "").strip()
    if reason:
        return "账号已被封禁：{}".format(reason)
    return "账号已被封禁"


def _is_valid_username(username):
    if not username:
        return False
    if len(username) < 3 or len(username) > 20:
        return False
    return all(ch.isalnum() or ch == "_" for ch in username)


def _safe_next_url(default_endpoint):
    nxt = (request.values.get("next") or "").strip()
    if nxt.startswith("/") and not nxt.startswith("//"):
        return nxt
    return url_for(default_endpoint)


def _safe_form_next_url(default_url):
    nxt = (request.form.get("next") or request.args.get("next") or "").strip()
    if nxt.startswith("/") and not nxt.startswith("//"):
        return nxt
    return default_url


def _create_notification(
    user_id,
    notif_type,
    message,
    actor_id=None,
    post_id=None,
    comment_id=None,
    report_id=None,
):
    """创建站内通知（由调用方控制事务提交）。"""
    if not user_id or not message:
        return
    db.session.add(ForumNotification(
        user_id=user_id,
        actor_id=actor_id,
        notif_type=notif_type,
        post_id=post_id,
        comment_id=comment_id,
        report_id=report_id,
        message=message[:255],
        is_read=False,
    ))


def _notification_target_url(notification):
    if notification.post_id:
        exists = db.session.get(ForumPost, notification.post_id)
        if exists:
            return url_for("forum_post_detail", post_id=notification.post_id)
    return url_for("user_notifications")


def _load_forum_categories(active_only=True):
    """读取论坛分类（默认只读启用项）。"""
    try:
        q = ForumCategory.query
        if active_only:
            q = q.filter_by(is_active=True)
        return q.order_by(ForumCategory.sort_order.asc(), ForumCategory.id.asc()).all()
    except Exception:
        return []


def _get_forum_category_names(active_only=True):
    rows = _load_forum_categories(active_only=active_only)
    names = [x.name for x in rows if x.name]
    if names:
        return names
    # 若全部被停用，前台仍回退到已存在分类，避免下拉为空。
    if active_only:
        rows = _load_forum_categories(active_only=False)
        names = [x.name for x in rows if x.name]
        if names:
            return names
    return list(DEFAULT_FORUM_CATEGORIES)


@app.context_processor
def inject_global_user():
    current_user = _get_current_user()
    notifications_unread_count = 0
    if current_user:
        notifications_unread_count = ForumNotification.query.filter_by(
            user_id=current_user.id,
            is_read=False,
        ).count()
    return {
        "current_user": current_user,
        "admin_logged_in": bool(session.get("admin_logged_in")),
        "forum_categories": _get_forum_category_names(active_only=True),
        "forum_report_reasons": FORUM_REPORT_REASONS,
        "notifications_unread_count": notifications_unread_count,
    }


def _humanize_time(dt):
    if not dt:
        return ""
    if dt.tzinfo is None:
        now = datetime.utcnow()
    else:
        now = datetime.now(dt.tzinfo)
    delta = now - dt
    seconds = int(delta.total_seconds())
    if seconds < 0:
        return dt.strftime("%Y-%m-%d")
    if seconds < 60:
        return "刚刚"
    if seconds < 3600:
        return "{} 分钟前".format(seconds // 60)
    if seconds < 86400:
        return "{} 小时前".format(seconds // 3600)
    if seconds < 86400 * 14:
        return "{} 天前".format(seconds // 86400)
    return dt.strftime("%Y-%m-%d")


def _build_forum_post_cards(rows):
    """将论坛查询结果行转换为列表卡片数据。"""
    cards = []
    for post, reply_count, latest_activity, author_name, like_count, bookmark_count in rows:
        latest_activity = latest_activity or post.created_at
        username = author_name or "用户"
        cards.append({
            "post": post,
            "reply_count": int(reply_count or 0),
            "view_count": int(post.view_count or 0),
            "like_count": int(like_count or 0),
            "bookmark_count": int(bookmark_count or 0),
            "latest_activity": latest_activity,
            "latest_activity_text": _humanize_time(latest_activity),
            "author_name": username,
            "author_initial": (username[0] if username else "?").upper(),
        })
    return cards


def _build_forum_url(tab="latest", category=None, q=None, page=1):
    """构建论坛列表页链接，并尽量保持 URL 简洁。"""
    params = {}
    if (tab or "latest") != "latest":
        params["tab"] = tab
    if category:
        params["category"] = category
    if q:
        params["q"] = q
    if page and int(page) > 1:
        params["page"] = int(page)
    return url_for("forum_index", **params)


def _query_forum_post_rows(active_tab="latest", selected_category=None, search_query=None, author_id=None):
    """论坛列表查询：支持最新/新帖/热门 + 分类过滤 + 关键词搜索。"""
    comment_stats_subq = (
        db.session.query(
            ForumComment.post_id.label("post_id"),
            func.count(ForumComment.id).label("comment_count"),
            func.max(ForumComment.created_at).label("latest_comment_at"),
        )
        .group_by(ForumComment.post_id)
        .subquery()
    )
    comment_count_expr = func.coalesce(comment_stats_subq.c.comment_count, 0)
    latest_activity_expr = func.coalesce(comment_stats_subq.c.latest_comment_at, ForumPost.created_at)
    like_stats_subq = (
        db.session.query(
            ForumPostLike.post_id.label("post_id"),
            func.count(ForumPostLike.id).label("like_count"),
        )
        .group_by(ForumPostLike.post_id)
        .subquery()
    )
    bookmark_stats_subq = (
        db.session.query(
            ForumPostBookmark.post_id.label("post_id"),
            func.count(ForumPostBookmark.id).label("bookmark_count"),
        )
        .group_by(ForumPostBookmark.post_id)
        .subquery()
    )
    like_count_expr = func.coalesce(like_stats_subq.c.like_count, 0)
    bookmark_count_expr = func.coalesce(bookmark_stats_subq.c.bookmark_count, 0)
    q = (
        db.session.query(
            ForumPost,
            comment_count_expr.label("comment_count"),
            latest_activity_expr.label("latest_activity"),
            User.username.label("author_name"),
            like_count_expr.label("like_count"),
            bookmark_count_expr.label("bookmark_count"),
        )
        .outerjoin(comment_stats_subq, comment_stats_subq.c.post_id == ForumPost.id)
        .outerjoin(like_stats_subq, like_stats_subq.c.post_id == ForumPost.id)
        .outerjoin(bookmark_stats_subq, bookmark_stats_subq.c.post_id == ForumPost.id)
        .outerjoin(User, User.id == ForumPost.user_id)
    )
    if selected_category:
        q = q.filter(ForumPost.category == selected_category)
    if author_id is not None:
        q = q.filter(ForumPost.user_id == author_id)
    if search_query:
        pattern = "%{}%".format(search_query)
        q = q.filter(
            or_(
                ForumPost.title.ilike(pattern),
                ForumPost.content.ilike(pattern),
                User.username.ilike(pattern),
            )
        )
    if active_tab == "hot":
        q = q.order_by(
            ForumPost.is_pinned.desc(),
            comment_count_expr.desc(),
            like_count_expr.desc(),
            ForumPost.view_count.desc(),
            latest_activity_expr.desc(),
            ForumPost.id.desc(),
        )
    elif active_tab == "new":
        q = q.order_by(ForumPost.is_pinned.desc(), ForumPost.created_at.desc(), ForumPost.id.desc())
    else:
        q = q.order_by(ForumPost.is_pinned.desc(), latest_activity_expr.desc(), ForumPost.id.desc())
    return q


def _forum_sidebar_data():
    category_counts = (
        db.session.query(ForumPost.category, func.count(ForumPost.id))
        .group_by(ForumPost.category)
        .order_by(func.count(ForumPost.id).desc())
        .all()
    )
    active_users = (
        db.session.query(User.username, func.count(ForumPost.id).label("post_count"))
        .outerjoin(ForumPost, ForumPost.user_id == User.id)
        .group_by(User.id)
        .order_by(func.count(ForumPost.id).desc(), User.created_at.asc())
        .limit(6)
        .all()
    )
    return {
        "total_users": User.query.count(),
        "total_posts": ForumPost.query.count(),
        "total_comments": ForumComment.query.count(),
        "category_counts": list(category_counts),
        "active_users": list(active_users),
    }


def _currency_symbol(currency):
    return "¥" if (currency or "CNY").upper() == "CNY" else "$"


def _format_money(currency, value):
    return "{}{:.2f}".format(_currency_symbol(currency), float(value))


def _format_history_time(dt):
    return dt.strftime("%Y-%m-%d %H:%M") if dt else ""


def _pick_price_pair(latest, previous=None):
    if previous is None:
        if latest.price_cny is not None:
            return "CNY", float(latest.price_cny), None
        if latest.price_usd is not None:
            return "USD", float(latest.price_usd), None
        return None, None, None
    if latest.price_cny is not None and previous.price_cny is not None:
        return "CNY", float(latest.price_cny), float(previous.price_cny)
    if latest.price_usd is not None and previous.price_usd is not None:
        return "USD", float(latest.price_usd), float(previous.price_usd)
    return None, None, None


def _build_price_trend(latest, previous=None):
    currency, current_value, previous_value = _pick_price_pair(latest, previous)
    if currency is None or current_value is None:
        return None
    source = PRICE_SOURCE_LABELS.get(latest.source or "", latest.source or "未知来源")
    meta = "当前 {} · {} · {}".format(
        _format_money(currency, current_value),
        _format_history_time(latest.captured_at),
        source,
    )
    if previous_value is None:
        return {
            "direction": "new",
            "delta_text": "首次记录",
            "meta_text": meta,
        }
    diff = current_value - previous_value
    if abs(diff) < 1e-9:
        return {
            "direction": "flat",
            "delta_text": "→ 持平",
            "meta_text": meta,
        }
    direction = "up" if diff > 0 else "down"
    arrow = "↑" if diff > 0 else "↓"
    sign = "+" if diff > 0 else "-"
    delta_text = "{} {}{}{:,.2f}".format(arrow, sign, _currency_symbol(currency), abs(diff))
    if abs(previous_value) > 1e-9:
        pct = diff / previous_value * 100
        delta_text += " ({:+.2f}%)".format(pct)
    return {
        "direction": direction,
        "delta_text": delta_text,
        "meta_text": meta,
    }


def _build_plan_trend_map(plans):
    plan_ids = [p.id for p in plans if p.id is not None]
    if not plan_ids:
        return {}
    rows = (
        PriceHistory.query
        .filter(PriceHistory.plan_id.in_(plan_ids))
        .order_by(PriceHistory.plan_id.asc(), PriceHistory.captured_at.desc(), PriceHistory.id.desc())
        .all()
    )
    grouped = {}
    for row in rows:
        bucket = grouped.setdefault(row.plan_id, [])
        if len(bucket) < 2:
            bucket.append(row)
    result = {}
    for plan_id, bucket in grouped.items():
        latest = bucket[0] if bucket else None
        previous = bucket[1] if len(bucket) > 1 else None
        trend = _build_price_trend(latest, previous) if latest else None
        if trend:
            result[plan_id] = trend
    return result


def admin_required(f):
    from functools import wraps
    @wraps(f)
    def wrapped(*args, **kwargs):
        if not session.get("admin_logged_in"):
            return redirect(url_for("admin_login"))
        return f(*args, **kwargs)
    return wrapped


def user_login_required(f):
    from functools import wraps
    @wraps(f)
    def wrapped(*args, **kwargs):
        user = _get_current_user()
        if not user:
            return redirect(url_for("user_login", next=request.path))
        if _is_banned_user(user):
            session.pop("user_id", None)
            return redirect(url_for("user_login", next=request.path, error=_user_ban_message(user)))
        return f(*args, **kwargs)
    return wrapped


def _ensure_forum_interaction_user(user, post_id=None):
    """校验当前登录用户是否可进行论坛互动动作。"""
    if not _is_banned_user(user):
        return None
    text = _user_ban_message(user)
    if post_id:
        return _forum_redirect_with_error(post_id, text)
    return redirect(url_for("forum_index", error=text))


def _can_edit_post(user, post):
    if not user or not post:
        return False
    return post.user_id == user.id


def _can_edit_comment(user, comment):
    if not user or not comment:
        return False
    return comment.user_id == user.id


def _forum_redirect_with_error(post_id, text_msg):
    return redirect(url_for("forum_post_detail", post_id=post_id, error=text_msg))


def _forum_redirect_with_msg(post_id, text_msg):
    return redirect(url_for("forum_post_detail", post_id=post_id, msg=text_msg))


# 首页多语言文案（中文 / English）
I18N = {
    "zh": {
        "tagline": "云服务器价格一目了然",
        "filter_provider": "厂商",
        "filter_region": "区域",
        "filter_memory": "内存 ≥",
        "filter_price": "价格区间",
        "filter_currency": "货币",
        "search_placeholder": "搜索厂商、配置...",
        "all": "全部",
        "unlimited": "不限",
        "btn_reset": "重置筛选",
        "th_provider": "厂商",
        "th_country": "国家",
        "th_config": "配置",
        "th_vcpu": "vCPU",
        "th_memory": "内存",
        "th_storage": "存储",
        "th_bandwidth": "带宽",
        "th_traffic": "流量",
        "th_price": "月付价格",
        "th_action": "操作",
        "disclaimer": "* 价格仅供参考，以各厂商官网为准。部分为按量/包年折算月价。",
        "footer_note": "数据仅供参考 · 请以云厂商官网实时报价为准",
        "contact_label": "联系我们",
        "empty_state": "未找到匹配的方案",
        "load_error": "数据加载失败，请刷新页面重试",
        "search_label": "搜索",
        "price_under50": "< ¥50",
        "price_50_100": "¥50-100",
        "price_100_300": "¥100-300",
        "price_300_500": "¥300-500",
        "price_over500": "> ¥500",
        "cny": "人民币 (¥)",
        "usd": "美元 ($)",
    },
    "en": {
        "tagline": "VPS & cloud server prices at a glance",
        "filter_provider": "Provider",
        "filter_region": "Region",
        "filter_memory": "Memory ≥",
        "filter_price": "Price range",
        "filter_currency": "Currency",
        "search_placeholder": "Search provider, config...",
        "all": "All",
        "unlimited": "Any",
        "btn_reset": "Reset",
        "th_provider": "Provider",
        "th_country": "Country",
        "th_config": "Config",
        "th_vcpu": "vCPU",
        "th_memory": "Memory",
        "th_storage": "Storage",
        "th_bandwidth": "Bandwidth",
        "th_traffic": "Traffic",
        "th_price": "Monthly",
        "th_action": "Action",
        "disclaimer": "* Prices are indicative. See provider sites for current rates.",
        "footer_note": "Data for reference only. Check provider sites for latest pricing.",
        "contact_label": "Contact",
        "empty_state": "No matching plans found",
        "load_error": "Failed to load data. Please refresh.",
        "search_label": "Search",
        "price_under50": "< 50",
        "price_50_100": "50-100",
        "price_100_300": "100-300",
        "price_300_500": "300-500",
        "price_over500": "> 500",
        "cny": "CNY (¥)",
        "usd": "USD ($)",
    },
}


@app.route("/")
def index():
    lang = request.args.get("lang") or session.get("lang", "zh")
    if lang not in ("zh", "en"):
        lang = "zh"
    session["lang"] = lang
    t = I18N[lang]
    plans = VPSPlan.query.order_by(VPSPlan.provider, VPSPlan.price_cny).all()
    return render_template(
        "index.html",
        site_url=SITE_URL,
        site_name=SITE_NAME,
        plans_json_ld=[p.to_dict() for p in plans],
        lang=lang,
        t=t,
    )


@app.route("/api/plans")
def api_plans():
    plans = VPSPlan.query.order_by(VPSPlan.provider, VPSPlan.price_cny).all()
    return jsonify([p.to_dict() for p in plans])


# ---------- 前台用户与论坛 ----------
@app.route("/register", methods=["GET", "POST"])
def user_register():
    current = _get_current_user()
    if current:
        if _is_banned_user(current):
            session.pop("user_id", None)
        else:
            return redirect(url_for("forum_index"))
    error = None
    if request.method == "POST":
        username = (request.form.get("username") or "").strip()
        password = request.form.get("password") or ""
        confirm_password = request.form.get("confirm_password") or ""

        if not _is_valid_username(username):
            error = "用户名需为 3-20 位，仅支持字母、数字、下划线"
        elif len(password) < 6:
            error = "密码至少 6 位"
        elif password != confirm_password:
            error = "两次输入的密码不一致"
        elif User.query.filter(func.lower(User.username) == username.lower()).first():
            error = "用户名已存在"
        else:
            user = User(username=username)
            user.set_password(password)
            user.last_login_at = datetime.now(timezone.utc)
            db.session.add(user)
            db.session.commit()
            session["user_id"] = user.id
            return redirect(_safe_next_url("forum_index"))

    return render_template("auth/register.html", error=error)


@app.route("/login", methods=["GET", "POST"])
def user_login():
    current = _get_current_user()
    if current:
        if _is_banned_user(current):
            session.pop("user_id", None)
        else:
            return redirect(url_for("forum_index"))
    error = (request.args.get("error") or "").strip() or None
    if request.method == "POST":
        username = (request.form.get("username") or "").strip()
        password = request.form.get("password") or ""
        user = User.query.filter(func.lower(User.username) == username.lower()).first()
        if not user or not user.check_password(password):
            error = "用户名或密码错误"
        elif _is_banned_user(user):
            error = _user_ban_message(user)
        else:
            user.last_login_at = datetime.now(timezone.utc)
            db.session.commit()
            session["user_id"] = user.id
            return redirect(_safe_next_url("forum_index"))
    return render_template("auth/login.html", error=error)


@app.route("/logout")
def user_logout():
    session.pop("user_id", None)
    return redirect(url_for("forum_index"))


@app.route("/profile")
def user_profile_redirect():
    return redirect(url_for("user_profile"))


@app.route("/me", methods=["GET", "POST"])
@user_login_required
def user_profile():
    user = _get_current_user()
    tab = (request.args.get("tab") or "posts").strip().lower()
    if tab not in {"posts", "comments", "likes", "bookmarks", "settings"}:
        tab = "posts"

    if request.method == "POST":
        action = (request.form.get("action") or "").strip().lower()
        if action == "profile":
            username = (request.form.get("username") or "").strip()
            if username == user.username:
                return redirect(url_for("user_profile", tab="settings", msg="资料未变更"))
            if not _is_valid_username(username):
                return redirect(url_for("user_profile", tab="settings", error="用户名需为 3-20 位，仅支持字母、数字、下划线"))
            exists = (
                User.query
                .filter(func.lower(User.username) == username.lower(), User.id != user.id)
                .first()
            )
            if exists:
                return redirect(url_for("user_profile", tab="settings", error="用户名已存在"))
            user.username = username
            db.session.commit()
            return redirect(url_for("user_profile", tab="settings", msg="用户名已更新"))

        if action == "password":
            current_password = request.form.get("current_password") or ""
            new_password = request.form.get("new_password") or ""
            confirm_password = request.form.get("confirm_password") or ""
            if not user.check_password(current_password):
                return redirect(url_for("user_profile", tab="settings", error="当前密码错误"))
            if len(new_password) < 6:
                return redirect(url_for("user_profile", tab="settings", error="新密码至少 6 位"))
            if new_password != confirm_password:
                return redirect(url_for("user_profile", tab="settings", error="两次新密码输入不一致"))
            user.set_password(new_password)
            db.session.commit()
            return redirect(url_for("user_profile", tab="settings", msg="密码已更新"))

        return redirect(url_for("user_profile", tab="settings", error="未知操作"))

    my_post_rows = (
        _query_forum_post_rows(active_tab="latest", author_id=user.id)
        .limit(60)
        .all()
    )
    my_post_cards = _build_forum_post_cards(my_post_rows)
    my_comment_rows = (
        db.session.query(
            ForumComment,
            ForumPost.id.label("post_id"),
            ForumPost.title.label("post_title"),
        )
        .join(ForumPost, ForumComment.post_id == ForumPost.id)
        .filter(ForumComment.user_id == user.id)
        .order_by(ForumComment.created_at.desc(), ForumComment.id.desc())
        .limit(120)
        .all()
    )
    my_comment_items = [
        {
            "comment": c,
            "post_id": post_id,
            "post_title": post_title,
        }
        for c, post_id, post_title in my_comment_rows
    ]
    my_like_rows = (
        db.session.query(
            ForumPostLike,
            ForumPost.id.label("post_id"),
            ForumPost.title.label("post_title"),
            ForumPost.category.label("post_category"),
            ForumPost.created_at.label("post_created_at"),
        )
        .join(ForumPost, ForumPostLike.post_id == ForumPost.id)
        .filter(ForumPostLike.user_id == user.id)
        .order_by(ForumPostLike.created_at.desc(), ForumPostLike.id.desc())
        .limit(120)
        .all()
    )
    my_like_items = [
        {
            "like": like_row,
            "post_id": post_id,
            "post_title": post_title,
            "post_category": post_category,
            "post_created_at": post_created_at,
        }
        for like_row, post_id, post_title, post_category, post_created_at in my_like_rows
    ]
    my_bookmark_rows = (
        db.session.query(
            ForumPostBookmark,
            ForumPost.id.label("post_id"),
            ForumPost.title.label("post_title"),
            ForumPost.category.label("post_category"),
            ForumPost.created_at.label("post_created_at"),
        )
        .join(ForumPost, ForumPostBookmark.post_id == ForumPost.id)
        .filter(ForumPostBookmark.user_id == user.id)
        .order_by(ForumPostBookmark.created_at.desc(), ForumPostBookmark.id.desc())
        .limit(120)
        .all()
    )
    my_bookmark_items = [
        {
            "bookmark": bookmark_row,
            "post_id": post_id,
            "post_title": post_title,
            "post_category": post_category,
            "post_created_at": post_created_at,
        }
        for bookmark_row, post_id, post_title, post_category, post_created_at in my_bookmark_rows
    ]
    stats = {
        "post_count": ForumPost.query.filter_by(user_id=user.id).count(),
        "comment_count": ForumComment.query.filter_by(user_id=user.id).count(),
        "like_count": ForumPostLike.query.filter_by(user_id=user.id).count(),
        "bookmark_count": ForumPostBookmark.query.filter_by(user_id=user.id).count(),
        "report_count": ForumReport.query.filter_by(reporter_id=user.id).count(),
        "pending_report_count": ForumReport.query.filter_by(reporter_id=user.id, status="pending").count(),
        "notification_count": ForumNotification.query.filter_by(user_id=user.id).count(),
        "unread_notification_count": ForumNotification.query.filter_by(user_id=user.id, is_read=False).count(),
    }
    return render_template(
        "forum/profile.html",
        profile_user=user,
        active_tab=tab,
        my_post_cards=my_post_cards,
        my_comment_items=my_comment_items,
        my_like_items=my_like_items,
        my_bookmark_items=my_bookmark_items,
        stats=stats,
        message=request.args.get("msg") or "",
        error=request.args.get("error") or "",
    )


@app.route("/notifications")
@user_login_required
def user_notifications():
    user = _get_current_user()
    status = (request.args.get("status") or "all").strip().lower()
    if status not in {"all", "unread", "read"}:
        status = "all"
    q = ForumNotification.query.filter_by(user_id=user.id)
    if status == "unread":
        q = q.filter_by(is_read=False)
    elif status == "read":
        q = q.filter_by(is_read=True)
    rows = q.order_by(ForumNotification.created_at.desc(), ForumNotification.id.desc()).limit(300).all()
    items = []
    for n in rows:
        items.append({
            "notification": n,
            "type_label": FORUM_NOTIFICATION_TYPE_LABELS.get(n.notif_type, n.notif_type or "通知"),
            "actor_name": n.actor_rel.username if n.actor_rel else "",
            "target_url": _notification_target_url(n),
            "time_text": _humanize_time(n.created_at),
        })
    unread_count = ForumNotification.query.filter_by(user_id=user.id, is_read=False).count()
    read_count = ForumNotification.query.filter_by(user_id=user.id, is_read=True).count()
    return render_template(
        "forum/notifications.html",
        active_status=status,
        notification_items=items,
        unread_count=unread_count,
        read_count=read_count,
        total_count=unread_count + read_count,
        message=request.args.get("msg") or "",
        error=request.args.get("error") or "",
    )


@app.route("/notification/<int:notification_id>/go")
@user_login_required
def user_notification_go(notification_id):
    user = _get_current_user()
    n = ForumNotification.query.get_or_404(notification_id)
    if n.user_id != user.id:
        return redirect(url_for("user_notifications", error="无权访问该通知"))
    if not n.is_read:
        n.is_read = True
        db.session.commit()
    return redirect(_notification_target_url(n))


@app.route("/notification/<int:notification_id>/read", methods=["POST"])
@user_login_required
def user_notification_read(notification_id):
    user = _get_current_user()
    n = ForumNotification.query.get_or_404(notification_id)
    if n.user_id != user.id:
        return redirect(url_for("user_notifications", error="无权操作该通知"))
    if not n.is_read:
        n.is_read = True
        db.session.commit()
    next_url = (request.form.get("next") or "").strip()
    if next_url.startswith("/") and not next_url.startswith("//"):
        return redirect(next_url)
    return redirect(url_for("user_notifications", msg="已标记为已读"))


@app.route("/notifications/read-all", methods=["POST"])
@user_login_required
def user_notifications_read_all():
    user = _get_current_user()
    unread = ForumNotification.query.filter_by(user_id=user.id, is_read=False)
    updated = unread.update({"is_read": True}, synchronize_session=False)
    db.session.commit()
    msg = "已全部标记为已读" if updated else "没有未读通知"
    return redirect(url_for("user_notifications", msg=msg))


@app.route("/forum")
def forum_index():
    active_tab = (request.args.get("tab") or "latest").strip().lower()
    if active_tab not in {"latest", "new", "hot"}:
        active_tab = "latest"
    selected_category = (request.args.get("category") or "").strip() or None
    if selected_category and len(selected_category) > 32:
        selected_category = selected_category[:32]
    search_query = (request.args.get("q") or "").strip()
    if len(search_query) > 80:
        search_query = search_query[:80]
    page = request.args.get("page", type=int) or 1
    if page < 1:
        page = 1
    per_page = 20

    rows_query = _query_forum_post_rows(
        active_tab=active_tab,
        selected_category=selected_category,
        search_query=search_query or None,
    )
    total_posts = rows_query.order_by(None).count()
    total_pages = max((total_posts + per_page - 1) // per_page, 1)
    if page > total_pages:
        page = total_pages
    rows = rows_query.offset((page - 1) * per_page).limit(per_page).all()
    post_cards = _build_forum_post_cards(rows)

    sidebar = _forum_sidebar_data()
    category_count_map = {name: int(count or 0) for name, count in (sidebar.get("category_counts") or [])}
    category_names = list(_get_forum_category_names(active_only=True))
    for name in category_count_map.keys():
        if name and name not in category_names:
            category_names.append(name)
    if selected_category and selected_category not in category_names:
        category_names.insert(0, selected_category)

    tab_defs = [
        ("latest", "最新"),
        ("new", "新帖"),
        ("hot", "热门"),
    ]
    tab_links = [
        {
            "key": key,
            "label": label,
            "url": _build_forum_url(
                tab=key,
                category=selected_category,
                q=search_query or None,
                page=1,
            ),
            "active": active_tab == key,
        }
        for key, label in tab_defs
    ]
    category_links = [
        {
            "name": "全部",
            "count": None,
            "url": _build_forum_url(tab=active_tab, category=None, q=search_query or None, page=1),
            "active": selected_category is None,
        }
    ]
    for name in category_names:
        category_links.append({
            "name": name,
            "count": category_count_map.get(name, 0),
            "url": _build_forum_url(tab=active_tab, category=name, q=search_query or None, page=1),
            "active": selected_category == name,
        })

    category_nav_url = _build_forum_url(
        tab=active_tab,
        category=selected_category or (category_names[0] if category_names else None),
        q=search_query or None,
        page=1,
    )

    window_start = max(1, page - 2)
    window_end = min(total_pages, page + 2)
    page_links = [
        {
            "num": num,
            "url": _build_forum_url(
                tab=active_tab,
                category=selected_category,
                q=search_query or None,
                page=num,
            ),
            "active": num == page,
        }
        for num in range(window_start, window_end + 1)
    ]

    has_filters = bool(selected_category or search_query or active_tab != "latest")
    if search_query and selected_category:
        empty_hint = "当前分类下没有匹配关键词的帖子。"
    elif search_query:
        empty_hint = "没有匹配关键词的帖子。"
    elif selected_category:
        empty_hint = "该分类暂时没有帖子。"
    else:
        empty_hint = "当前没有帖子，点击右上角按钮发布第一条内容。"

    result_start = ((page - 1) * per_page + 1) if total_posts else 0
    result_end = min(page * per_page, total_posts) if total_posts else 0

    return render_template(
        "forum/index.html",
        post_cards=post_cards,
        sidebar=sidebar,
        active_tab=active_tab,
        selected_category=selected_category,
        search_query=search_query,
        tab_links=tab_links,
        category_links=category_links,
        category_nav_url=category_nav_url,
        total_posts=total_posts,
        total_pages=total_pages,
        current_page=page,
        page_links=page_links,
        has_prev=(page > 1),
        has_next=(page < total_pages),
        prev_page_url=_build_forum_url(
            tab=active_tab,
            category=selected_category,
            q=search_query or None,
            page=page - 1,
        ),
        next_page_url=_build_forum_url(
            tab=active_tab,
            category=selected_category,
            q=search_query or None,
            page=page + 1,
        ),
        clear_search_url=_build_forum_url(
            tab=active_tab,
            category=selected_category,
            q=None,
            page=1,
        ),
        clear_all_url=_build_forum_url(tab="latest", category=None, q=None, page=1),
        has_filters=has_filters,
        empty_hint=empty_hint,
        result_start=result_start,
        result_end=result_end,
        message=request.args.get("msg") or "",
        error=request.args.get("error") or "",
    )


@app.route("/forum/post/new", methods=["GET", "POST"])
@user_login_required
def forum_post_new():
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user)
    if blocked_resp:
        return blocked_resp
    error = None
    title = ""
    content = ""
    available_categories = _get_forum_category_names(active_only=True)
    category = available_categories[0] if available_categories else "综合讨论"
    if request.method == "POST":
        title = (request.form.get("title") or "").strip()
        content = (request.form.get("content") or "").strip()
        category = (request.form.get("category") or "").strip() or category
        if category not in available_categories:
            category = available_categories[0] if available_categories else "综合讨论"
        if len(title) < 5:
            error = "标题至少 5 个字符"
        elif len(title) > 160:
            error = "标题不能超过 160 个字符"
        elif len(content) < 10:
            error = "内容至少 10 个字符"
        else:
            post = ForumPost(
                user_id=user.id,
                category=category,
                title=title,
                content=content,
            )
            db.session.add(post)
            db.session.commit()
            return redirect(url_for("forum_post_detail", post_id=post.id))
    return render_template(
        "forum/post_form.html",
        error=error,
        title_val=title,
        content_val=content,
        category_val=category,
        categories=available_categories,
        page_title="创建新主题",
        submit_text="发布主题",
        action_url=url_for("forum_post_new"),
        cancel_url=url_for("forum_index"),
        form_mode="create",
    )


@app.route("/forum/post/<int:post_id>/edit", methods=["GET", "POST"])
@user_login_required
def forum_post_edit(post_id):
    post = ForumPost.query.get_or_404(post_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=post.id)
    if blocked_resp:
        return blocked_resp
    if not _can_edit_post(user, post):
        return _forum_redirect_with_error(post.id, "你没有权限编辑该帖子")

    error = None
    title = post.title or ""
    content = post.content or ""
    available_categories = _get_forum_category_names(active_only=True)
    if post.category and post.category not in available_categories:
        available_categories.insert(0, post.category)
    category = post.category or (available_categories[0] if available_categories else "综合讨论")
    if request.method == "POST":
        title = (request.form.get("title") or "").strip()
        content = (request.form.get("content") or "").strip()
        category = (request.form.get("category") or "").strip() or category
        if category not in available_categories:
            category = available_categories[0] if available_categories else "综合讨论"
        if len(title) < 5:
            error = "标题至少 5 个字符"
        elif len(title) > 160:
            error = "标题不能超过 160 个字符"
        elif len(content) < 10:
            error = "内容至少 10 个字符"
        else:
            post.title = title
            post.content = content
            post.category = category
            db.session.commit()
            return _forum_redirect_with_msg(post.id, "帖子已更新")

    return render_template(
        "forum/post_form.html",
        error=error,
        title_val=title,
        content_val=content,
        category_val=category,
        categories=available_categories,
        page_title="编辑主题",
        submit_text="保存修改",
        action_url=url_for("forum_post_edit", post_id=post.id),
        cancel_url=url_for("forum_post_detail", post_id=post.id),
        form_mode="edit",
    )


@app.route("/forum/post/<int:post_id>/delete", methods=["POST"])
@user_login_required
def forum_post_delete(post_id):
    post = ForumPost.query.get_or_404(post_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=post.id)
    if blocked_resp:
        return blocked_resp
    if not _can_edit_post(user, post):
        return _forum_redirect_with_error(post.id, "你没有权限删除该帖子")
    db.session.delete(post)
    db.session.commit()
    return redirect(url_for("forum_index"))


@app.route("/forum/post/<int:post_id>")
def forum_post_detail(post_id):
    post = ForumPost.query.get_or_404(post_id)
    current_user = _get_current_user()
    viewed_posts = session.get("viewed_posts") or []
    if post.id not in viewed_posts:
        post.view_count = int(post.view_count or 0) + 1
        viewed_posts.append(post.id)
        session["viewed_posts"] = viewed_posts[-200:]
        db.session.commit()
    comments = (
        ForumComment.query
        .filter_by(post_id=post.id)
        .order_by(ForumComment.created_at.asc(), ForumComment.id.asc())
        .all()
    )
    like_count = ForumPostLike.query.filter_by(post_id=post.id).count()
    bookmark_count = ForumPostBookmark.query.filter_by(post_id=post.id).count()
    liked_by_me = False
    bookmarked_by_me = False
    can_interact = bool(current_user and not _is_banned_user(current_user))
    if current_user:
        liked_by_me = (
            ForumPostLike.query
            .filter_by(post_id=post.id, user_id=current_user.id)
            .first() is not None
        )
        bookmarked_by_me = (
            ForumPostBookmark.query
            .filter_by(post_id=post.id, user_id=current_user.id)
            .first() is not None
        )
    sidebar = _forum_sidebar_data()
    return render_template(
        "forum/post_detail.html",
        post=post,
        comments=comments,
        like_count=like_count,
        bookmark_count=bookmark_count,
        liked_by_me=liked_by_me,
        bookmarked_by_me=bookmarked_by_me,
        can_interact=can_interact,
        sidebar=sidebar,
        message=request.args.get("msg") or "",
        error=request.args.get("error") or "",
    )


@app.route("/forum/post/<int:post_id>/like", methods=["POST"])
@user_login_required
def forum_post_like_toggle(post_id):
    post = ForumPost.query.get_or_404(post_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=post.id)
    if blocked_resp:
        return blocked_resp

    exists = ForumPostLike.query.filter_by(post_id=post.id, user_id=user.id).first()
    if exists:
        db.session.delete(exists)
        db.session.commit()
        return redirect(_safe_form_next_url(url_for("forum_post_detail", post_id=post.id, msg="已取消点赞")))
    db.session.add(ForumPostLike(post_id=post.id, user_id=user.id))
    db.session.commit()
    return redirect(_safe_form_next_url(url_for("forum_post_detail", post_id=post.id, msg="已点赞该帖子")))


@app.route("/forum/post/<int:post_id>/bookmark", methods=["POST"])
@user_login_required
def forum_post_bookmark_toggle(post_id):
    post = ForumPost.query.get_or_404(post_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=post.id)
    if blocked_resp:
        return blocked_resp

    exists = ForumPostBookmark.query.filter_by(post_id=post.id, user_id=user.id).first()
    if exists:
        db.session.delete(exists)
        db.session.commit()
        return redirect(_safe_form_next_url(url_for("forum_post_detail", post_id=post.id, msg="已取消收藏")))
    db.session.add(ForumPostBookmark(post_id=post.id, user_id=user.id))
    db.session.commit()
    return redirect(_safe_form_next_url(url_for("forum_post_detail", post_id=post.id, msg="已收藏该帖子")))


@app.route("/forum/post/<int:post_id>/comment", methods=["POST"])
@user_login_required
def forum_post_comment(post_id):
    post = ForumPost.query.get_or_404(post_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=post.id)
    if blocked_resp:
        return blocked_resp
    if post.is_locked:
        return _forum_redirect_with_error(post.id, "该帖子已锁定，暂不允许新增评论")
    content = (request.form.get("content") or "").strip()
    if len(content) < 2:
        return redirect(url_for("forum_post_detail", post_id=post.id, error="评论至少 2 个字符"))
    comment = ForumComment(
        post_id=post.id,
        user_id=user.id,
        content=content,
    )
    db.session.add(comment)
    db.session.flush()

    actor_name = user.username or "用户"
    post_title = post.title or "主题"
    if post.user_id and post.user_id != user.id:
        _create_notification(
            user_id=post.user_id,
            notif_type="post_commented",
            message="{} 评论了你的帖子《{}》".format(actor_name, post_title),
            actor_id=user.id,
            post_id=post.id,
            comment_id=comment.id,
        )

    participant_rows = (
        db.session.query(ForumComment.user_id)
        .filter(
            ForumComment.post_id == post.id,
            ForumComment.user_id.isnot(None),
            ForumComment.user_id != user.id,
        )
        .distinct()
        .limit(50)
        .all()
    )
    for (uid,) in participant_rows:
        if not uid:
            continue
        if uid == post.user_id or uid == user.id:
            continue
        _create_notification(
            user_id=uid,
            notif_type="thread_replied",
            message="{} 在你参与的主题《{}》有新回复".format(actor_name, post_title),
            actor_id=user.id,
            post_id=post.id,
            comment_id=comment.id,
        )

    db.session.commit()
    return redirect(url_for("forum_post_detail", post_id=post.id, msg="评论发布成功"))


@app.route("/forum/comment/<int:comment_id>/edit", methods=["GET", "POST"])
@user_login_required
def forum_comment_edit(comment_id):
    comment = ForumComment.query.get_or_404(comment_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=comment.post_id)
    if blocked_resp:
        return blocked_resp
    if not _can_edit_comment(user, comment):
        return _forum_redirect_with_error(comment.post_id, "你没有权限编辑该评论")

    error = None
    content = comment.content or ""
    if request.method == "POST":
        content = (request.form.get("content") or "").strip()
        if len(content) < 2:
            error = "评论至少 2 个字符"
        else:
            comment.content = content
            db.session.commit()
            return _forum_redirect_with_msg(comment.post_id, "评论已更新")

    return render_template(
        "forum/comment_form.html",
        error=error,
        comment=comment,
        content_val=content,
        action_url=url_for("forum_comment_edit", comment_id=comment.id),
        cancel_url=url_for("forum_post_detail", post_id=comment.post_id),
    )


@app.route("/forum/comment/<int:comment_id>/delete", methods=["POST"])
@user_login_required
def forum_comment_delete(comment_id):
    comment = ForumComment.query.get_or_404(comment_id)
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user, post_id=comment.post_id)
    if blocked_resp:
        return blocked_resp
    if not _can_edit_comment(user, comment):
        return _forum_redirect_with_error(comment.post_id, "你没有权限删除该评论")
    post_id = comment.post_id
    db.session.delete(comment)
    db.session.commit()
    return _forum_redirect_with_msg(post_id, "评论已删除")


@app.route("/forum/report", methods=["POST"])
@user_login_required
def forum_report_create():
    user = _get_current_user()
    blocked_resp = _ensure_forum_interaction_user(user)
    if blocked_resp:
        return blocked_resp
    target_type = (request.form.get("target_type") or "").strip().lower()
    target_id = request.form.get("target_id", type=int) or 0
    reason = (request.form.get("reason") or "其他").strip()
    detail = (request.form.get("detail") or "").strip()
    if len(detail) > 500:
        detail = detail[:500]
    if reason not in FORUM_REPORT_REASONS:
        reason = "其他"

    report_post_id = None
    target_owner_id = None
    snapshot_title = None
    snapshot_content = None
    if target_type == "post":
        target_post = db.session.get(ForumPost, target_id)
        if target_post is None:
            return redirect(url_for("forum_index"))
        report_post_id = target_post.id
        target_owner_id = target_post.user_id
        snapshot_title = target_post.title
        snapshot_content = target_post.content
    elif target_type == "comment":
        target_comment = db.session.get(ForumComment, target_id)
        if target_comment is None:
            return redirect(url_for("forum_index"))
        report_post_id = target_comment.post_id
        target_owner_id = target_comment.user_id
        snapshot_title = target_comment.post_rel.title if target_comment.post_rel else None
        snapshot_content = target_comment.content
    else:
        return redirect(url_for("forum_index"))

    if target_owner_id == user.id:
        return _forum_redirect_with_error(report_post_id, "不能举报自己的内容")

    exists = ForumReport.query.filter_by(
        reporter_id=user.id,
        target_type=target_type,
        target_id=target_id,
        status="pending",
    ).first()
    if exists:
        return _forum_redirect_with_msg(report_post_id, "你已举报该内容，请等待处理")

    db.session.add(ForumReport(
        reporter_id=user.id,
        target_type=target_type,
        target_id=target_id,
        reason=reason,
        detail=detail or None,
        snapshot_title=snapshot_title,
        snapshot_content=snapshot_content,
        status="pending",
    ))
    db.session.commit()
    return _forum_redirect_with_msg(report_post_id, "举报已提交，感谢反馈")


# ---------- SEO ----------
@app.route("/sitemap.xml")
def sitemap():
    from flask import make_response
    url = SITE_URL.rstrip("/")
    xml = f'''<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>{url}/</loc>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
  </url>
  <url>
    <loc>{url}/forum</loc>
    <changefreq>daily</changefreq>
    <priority>0.9</priority>
  </url>
</urlset>'''
    resp = make_response(xml)
    resp.mimetype = "application/xml"
    return resp


@app.route("/robots.txt")
def robots():
    from flask import make_response
    url = SITE_URL.rstrip("/")
    txt = f"""User-agent: *
Allow: /

Sitemap: {url}/sitemap.xml
"""
    resp = make_response(txt)
    resp.mimetype = "text/plain"
    return resp


# ---------- 后台 ----------
@app.route("/admin/login", methods=["GET", "POST"])
def admin_login():
    if request.method == "POST":
        password = request.form.get("password", "")
        if password == ADMIN_PASSWORD:
            session["admin_logged_in"] = True
            return redirect(url_for("admin_dashboard"))
        return render_template("admin/login.html", error="密码错误")
    return render_template("admin/login.html")


@app.route("/admin/logout")
def admin_logout():
    session.pop("admin_logged_in", None)
    return redirect(url_for("index"))


@app.route("/admin/api/plan/<int:plan_id>")
@admin_required
def admin_api_plan(plan_id):
    plan = VPSPlan.query.get_or_404(plan_id)
    return jsonify({
        "id": plan.id,
        "provider_id": plan.provider_id,
        "countries": plan.countries or "",
        "vcpu": plan.vcpu,
        "memory_gb": plan.memory_gb,
        "storage_gb": plan.storage_gb,
        "bandwidth_mbps": plan.bandwidth_mbps,
        "traffic": plan.traffic or "",
        "price_cny": float(plan.price_cny) if plan.price_cny is not None else None,
        "price_usd": float(plan.price_usd) if plan.price_usd is not None else None,
        "currency": plan.currency or "CNY",
        "official_url": plan.official_url or "",
    })


@app.route("/admin/api/plan/<int:plan_id>/price-history")
@admin_required
def admin_api_plan_price_history(plan_id):
    plan = VPSPlan.query.get_or_404(plan_id)
    rows = (
        PriceHistory.query
        .filter_by(plan_id=plan.id)
        .order_by(PriceHistory.captured_at.desc(), PriceHistory.id.desc())
        .limit(30)
        .all()
    )
    return jsonify([
        {
            "id": r.id,
            "price_cny": float(r.price_cny) if r.price_cny is not None else None,
            "price_usd": float(r.price_usd) if r.price_usd is not None else None,
            "currency": r.currency or "CNY",
            "source": r.source or "",
            "captured_at": r.captured_at.isoformat() if r.captured_at else "",
        }
        for r in rows
    ])


@app.route("/admin")
@admin_required
def admin_dashboard():
    providers = Provider.query.order_by(Provider.name).all()
    plans = VPSPlan.query.order_by(VPSPlan.provider, VPSPlan.price_cny).all()
    plan_trends = _build_plan_trend_map(plans)
    return render_template(
        "admin/dashboard.html",
        providers=providers,
        plans=plans,
        plan_trends=plan_trends,
        country_tags=COUNTRY_TAGS,
    )


# ---------- 厂商管理 ----------
@app.route("/admin/providers")
@admin_required
def admin_providers():
    providers = Provider.query.order_by(Provider.name).all()
    return render_template("admin/providers.html", providers=providers)


@app.route("/admin/provider/new", methods=["GET", "POST"])
@admin_required
def admin_provider_new():
    if request.method == "POST":
        name = request.form.get("name", "").strip()
        official_url = request.form.get("official_url", "").strip() or None
        if not name:
            return render_template("admin/provider_form.html", provider=None, error="请填写厂商名称")
        if Provider.query.filter_by(name=name).first():
            return render_template("admin/provider_form.html", provider=None, error="该厂商名称已存在")
        p = Provider(name=name, official_url=official_url)
        db.session.add(p)
        db.session.commit()
        return redirect(url_for("admin_provider_detail", provider_id=p.id))
    return render_template("admin/provider_form.html", provider=None)


@app.route("/admin/provider/<int:provider_id>")
@admin_required
def admin_provider_detail(provider_id):
    provider = Provider.query.get_or_404(provider_id)
    plans = VPSPlan.query.filter(
        (VPSPlan.provider_id == provider_id) | (VPSPlan.provider == provider.name)
    ).order_by(VPSPlan.price_cny.asc(), VPSPlan.name).all()
    providers = Provider.query.order_by(Provider.name).all()
    plan_trends = _build_plan_trend_map(plans)
    return render_template(
        "admin/provider_detail.html",
        provider=provider,
        plans=plans,
        plan_trends=plan_trends,
        providers=providers,
        country_tags=COUNTRY_TAGS,
    )


@app.route("/admin/provider/<int:provider_id>/edit", methods=["GET", "POST"])
@admin_required
def admin_provider_edit(provider_id):
    provider = Provider.query.get_or_404(provider_id)
    if request.method == "POST":
        provider.name = request.form.get("name", "").strip()
        provider.official_url = request.form.get("official_url", "").strip() or None
        if not provider.name:
            return render_template("admin/provider_form.html", provider=provider, error="请填写厂商名称")
        db.session.commit()
        return redirect(url_for("admin_provider_detail", provider_id=provider.id))
    return render_template("admin/provider_form.html", provider=provider)


@app.route("/admin/provider/<int:provider_id>/delete", methods=["POST"])
@admin_required
def admin_provider_delete(provider_id):
    provider = Provider.query.get_or_404(provider_id)
    # 将该厂商下的配置改为无厂商关联（保留配置，仅清空 provider_id）
    VPSPlan.query.filter_by(provider_id=provider_id).update({"provider_id": None})
    db.session.delete(provider)
    db.session.commit()
    return redirect(url_for("admin_providers"))


def _parse_sort_order(raw, default=100):
    s = (raw or "").strip()
    if not s:
        return default
    try:
        return int(s)
    except ValueError:
        return default


def _admin_user_counts(user_ids):
    """批量统计用户维度数据，减少列表页 N+1 查询。"""
    if not user_ids:
        return {
            "posts": {},
            "comments": {},
            "reports": {},
            "unread_notifications": {},
        }

    post_counts = {
        uid: int(cnt or 0)
        for uid, cnt in (
            db.session.query(ForumPost.user_id, func.count(ForumPost.id))
            .filter(ForumPost.user_id.in_(user_ids))
            .group_by(ForumPost.user_id)
            .all()
        )
    }
    comment_counts = {
        uid: int(cnt or 0)
        for uid, cnt in (
            db.session.query(ForumComment.user_id, func.count(ForumComment.id))
            .filter(ForumComment.user_id.in_(user_ids))
            .group_by(ForumComment.user_id)
            .all()
        )
    }
    report_counts = {
        uid: int(cnt or 0)
        for uid, cnt in (
            db.session.query(ForumReport.reporter_id, func.count(ForumReport.id))
            .filter(ForumReport.reporter_id.in_(user_ids))
            .group_by(ForumReport.reporter_id)
            .all()
        )
    }
    unread_notification_counts = {
        uid: int(cnt or 0)
        for uid, cnt in (
            db.session.query(ForumNotification.user_id, func.count(ForumNotification.id))
            .filter(ForumNotification.user_id.in_(user_ids), ForumNotification.is_read.is_(False))
            .group_by(ForumNotification.user_id)
            .all()
        )
    }
    return {
        "posts": post_counts,
        "comments": comment_counts,
        "reports": report_counts,
        "unread_notifications": unread_notification_counts,
    }


def _admin_load_user_options(limit=400):
    return (
        User.query
        .order_by(User.username.asc(), User.id.asc())
        .limit(limit)
        .all()
    )


def _admin_load_post_options(limit=400):
    return (
        ForumPost.query
        .order_by(ForumPost.created_at.desc(), ForumPost.id.desc())
        .limit(limit)
        .all()
    )


def _admin_fill_post_and_user_options(post_options, selected_post_id, user_options, selected_user_id):
    """确保编辑场景中的当前值始终出现在下拉框中。"""
    if selected_post_id and all(p.id != selected_post_id for p in post_options):
        selected_post = db.session.get(ForumPost, selected_post_id)
        if selected_post:
            post_options = [selected_post] + post_options
    if selected_user_id and all(u.id != selected_user_id for u in user_options):
        selected_user = db.session.get(User, selected_user_id)
        if selected_user:
            user_options = [selected_user] + user_options
    return post_options, user_options


# ---------- 论坛分类管理 ----------
@app.route("/admin/forum/categories")
@admin_required
def admin_forum_categories():
    categories = _load_forum_categories(active_only=False)
    posts_by_category = {
        name: count
        for name, count in (
            db.session.query(ForumPost.category, func.count(ForumPost.id))
            .group_by(ForumPost.category)
            .all()
        )
    }
    return render_template(
        "admin/forum_categories.html",
        categories=categories,
        posts_by_category=posts_by_category,
        msg=request.args.get("msg", ""),
        error=request.args.get("error", ""),
    )


@app.route("/admin/forum/category/new", methods=["GET", "POST"])
@admin_required
def admin_forum_category_new():
    error = ""
    name_val = ""
    sort_order_val = 100
    is_active_val = True
    if request.method == "POST":
        name_val = (request.form.get("name") or "").strip()
        sort_order_val = _parse_sort_order(request.form.get("sort_order"), 100)
        is_active_val = bool(request.form.get("is_active"))
        if not name_val:
            error = "请填写分类名称"
        elif len(name_val) > 32:
            error = "分类名称最多 32 个字符"
        elif ForumCategory.query.filter(func.lower(ForumCategory.name) == name_val.lower()).first():
            error = "分类名称已存在"
        else:
            db.session.add(ForumCategory(
                name=name_val,
                sort_order=sort_order_val,
                is_active=is_active_val,
            ))
            db.session.commit()
            return redirect(url_for("admin_forum_categories", msg="已新增分类：{}".format(name_val)))
    return render_template(
        "admin/forum_category_form.html",
        page_title="新增论坛分类",
        submit_text="创建分类",
        action_url=url_for("admin_forum_category_new"),
        error=error,
        name_val=name_val,
        sort_order_val=sort_order_val,
        is_active_val=is_active_val,
        category_id=None,
    )


@app.route("/admin/forum/category/<int:category_id>/edit", methods=["GET", "POST"])
@admin_required
def admin_forum_category_edit(category_id):
    category = ForumCategory.query.get_or_404(category_id)
    error = ""
    name_val = category.name
    sort_order_val = category.sort_order
    is_active_val = bool(category.is_active)
    if request.method == "POST":
        name_val = (request.form.get("name") or "").strip()
        sort_order_val = _parse_sort_order(request.form.get("sort_order"), category.sort_order)
        is_active_val = bool(request.form.get("is_active"))
        if not name_val:
            error = "请填写分类名称"
        elif len(name_val) > 32:
            error = "分类名称最多 32 个字符"
        elif category.is_active and not is_active_val and ForumCategory.query.filter_by(is_active=True).count() <= 1:
            error = "至少保留一个启用分类"
        else:
            exists = (
                ForumCategory.query
                .filter(func.lower(ForumCategory.name) == name_val.lower(), ForumCategory.id != category.id)
                .first()
            )
            if exists:
                error = "分类名称已存在"
            else:
                old_name = category.name
                category.name = name_val
                category.sort_order = sort_order_val
                category.is_active = is_active_val
                if old_name != name_val:
                    ForumPost.query.filter_by(category=old_name).update({"category": name_val})
                db.session.commit()
                return redirect(url_for("admin_forum_categories", msg="已更新分类：{}".format(name_val)))
    return render_template(
        "admin/forum_category_form.html",
        page_title="编辑论坛分类",
        submit_text="保存修改",
        action_url=url_for("admin_forum_category_edit", category_id=category.id),
        error=error,
        name_val=name_val,
        sort_order_val=sort_order_val,
        is_active_val=is_active_val,
        category_id=category.id,
    )


@app.route("/admin/forum/category/<int:category_id>/delete", methods=["POST"])
@admin_required
def admin_forum_category_delete(category_id):
    category = ForumCategory.query.get_or_404(category_id)
    total = ForumCategory.query.count()
    if total <= 1:
        return redirect(url_for("admin_forum_categories", error="至少保留一个分类，无法删除最后一个"))
    if category.is_active and ForumCategory.query.filter_by(is_active=True).count() <= 1:
        return redirect(url_for("admin_forum_categories", error="至少保留一个启用分类，无法删除最后一个启用项"))
    replacement = (
        ForumCategory.query
        .filter(ForumCategory.id != category.id)
        .order_by(ForumCategory.is_active.desc(), ForumCategory.sort_order.asc(), ForumCategory.id.asc())
        .first()
    )
    if replacement is None:
        return redirect(url_for("admin_forum_categories", error="未找到可替代分类"))
    ForumPost.query.filter_by(category=category.name).update({"category": replacement.name})
    db.session.delete(category)
    db.session.commit()
    return redirect(url_for("admin_forum_categories", msg="已删除分类，帖子迁移到：{}".format(replacement.name)))


def _get_report_target_info(report):
    """返回举报目标的展示信息。"""
    info = {
        "exists": False,
        "post_id": None,
        "title": report.snapshot_title or "",
        "content": report.snapshot_content or "",
        "author_name": "",
    }
    if report.target_type == "post":
        post = db.session.get(ForumPost, report.target_id)
        if post:
            info.update({
                "exists": True,
                "post_id": post.id,
                "title": post.title or info["title"],
                "content": post.content or info["content"],
                "author_name": post.author_rel.username if post.author_rel else "",
            })
    elif report.target_type == "comment":
        comment = db.session.get(ForumComment, report.target_id)
        if comment:
            info.update({
                "exists": True,
                "post_id": comment.post_id,
                "title": comment.post_rel.title if comment.post_rel else (info["title"] or ""),
                "content": comment.content or info["content"],
                "author_name": comment.author_rel.username if comment.author_rel else "",
            })
    if info["content"] and len(info["content"]) > 140:
        info["content"] = info["content"][:140] + "..."
    return info


@app.route("/admin/forum/reports")
@admin_required
def admin_forum_reports():
    status = (request.args.get("status") or "pending").strip().lower()
    if status not in {"pending", "processed", "rejected", "all"}:
        status = "pending"
    q = ForumReport.query.order_by(ForumReport.created_at.desc(), ForumReport.id.desc())
    if status != "all":
        q = q.filter_by(status=status)
    reports = q.limit(300).all()
    report_items = []
    for r in reports:
        report_items.append({
            "report": r,
            "target": _get_report_target_info(r),
            "reporter_name": r.reporter_rel.username if r.reporter_rel else "用户",
        })
    grouped = (
        db.session.query(ForumReport.status, func.count(ForumReport.id))
        .group_by(ForumReport.status)
        .all()
    )
    count_map = {k: int(v or 0) for k, v in grouped}
    return render_template(
        "admin/forum_reports.html",
        status=status,
        report_items=report_items,
        status_count_map=count_map,
        status_labels=FORUM_REPORT_STATUS_LABELS,
        msg=request.args.get("msg", ""),
        error=request.args.get("error", ""),
    )


@app.route("/admin/forum/report/<int:report_id>/process", methods=["POST"])
@admin_required
def admin_forum_report_process(report_id):
    report = ForumReport.query.get_or_404(report_id)
    action = (request.form.get("action") or "").strip().lower()
    review_note = (request.form.get("review_note") or "").strip()
    if len(review_note) > 500:
        review_note = review_note[:500]

    if report.status != "pending":
        return redirect(url_for("admin_forum_reports", error="该举报已处理"))

    outcome = ""
    target_owner_id = None
    target_post_id = None
    target_kind_label = "内容"
    if action == "delete_target":
        deleted = False
        if report.target_type == "post":
            target = db.session.get(ForumPost, report.target_id)
            if target:
                target_owner_id = target.user_id
                target_post_id = target.id
                target_kind_label = "帖子"
                db.session.delete(target)
                deleted = True
            outcome = "已删除被举报帖子" if deleted else "目标帖子已不存在"
        elif report.target_type == "comment":
            target = db.session.get(ForumComment, report.target_id)
            if target:
                target_owner_id = target.user_id
                target_post_id = target.post_id
                target_kind_label = "评论"
                db.session.delete(target)
                deleted = True
            outcome = "已删除被举报评论" if deleted else "目标评论已不存在"
        else:
            return redirect(url_for("admin_forum_reports", error="未知举报目标类型"))
        report.status = "processed"
        report.review_note = review_note or outcome
    elif action == "keep":
        report.status = "processed"
        report.review_note = review_note or "审核后保留内容"
        outcome = "已标记为保留"
    elif action == "reject":
        report.status = "rejected"
        report.review_note = review_note or "举报不成立"
        outcome = "已驳回举报"
    else:
        return redirect(url_for("admin_forum_reports", error="未知处理动作"))

    report.reviewed_by = "admin"
    report.reviewed_at = datetime.now(timezone.utc)

    _create_notification(
        user_id=report.reporter_id,
        notif_type="report_processed",
        message="你提交的举报（#{}）处理结果：{}".format(report.id, outcome),
        report_id=report.id,
        post_id=target_post_id,
    )
    if action == "delete_target" and target_owner_id and target_owner_id != report.reporter_id:
        _create_notification(
            user_id=target_owner_id,
            notif_type="content_removed",
            message="你的{}因举报处理已被删除".format(target_kind_label),
            report_id=report.id,
            post_id=target_post_id,
        )

    db.session.commit()
    return redirect(url_for("admin_forum_reports", msg=outcome))


@app.route("/admin/users")
@admin_required
def admin_users():
    keyword = (request.args.get("q") or "").strip()
    if len(keyword) > 50:
        keyword = keyword[:50]
    q = User.query
    if keyword:
        pattern = "%{}%".format(keyword)
        q = q.filter(User.username.ilike(pattern))
    users = q.order_by(User.created_at.desc(), User.id.desc()).limit(300).all()
    user_ids = [u.id for u in users]
    count_maps = _admin_user_counts(user_ids)
    return render_template(
        "admin/users.html",
        users=users,
        keyword=keyword,
        post_count_map=count_maps["posts"],
        comment_count_map=count_maps["comments"],
        report_count_map=count_maps["reports"],
        unread_notification_count_map=count_maps["unread_notifications"],
        msg=request.args.get("msg", ""),
        error=request.args.get("error", ""),
    )


@app.route("/admin/user/new", methods=["GET", "POST"])
@admin_required
def admin_user_new():
    error = ""
    username_val = ""
    if request.method == "POST":
        username_val = (request.form.get("username") or "").strip()
        password = request.form.get("password") or ""
        confirm_password = request.form.get("confirm_password") or ""

        if not _is_valid_username(username_val):
            error = "用户名需为 3-20 位，仅支持字母、数字、下划线"
        elif len(password) < 6:
            error = "密码至少 6 位"
        elif password != confirm_password:
            error = "两次输入的密码不一致"
        elif User.query.filter(func.lower(User.username) == username_val.lower()).first():
            error = "用户名已存在"
        else:
            user = User(username=username_val)
            user.set_password(password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for("admin_users", msg="已新增用户：{}".format(username_val)))

    return render_template(
        "admin/user_form.html",
        page_title="新增用户",
        submit_text="创建用户",
        action_url=url_for("admin_user_new"),
        error=error,
        username_val=username_val,
        user_id=None,
    )


@app.route("/admin/user/<int:user_id>/edit", methods=["GET", "POST"])
@admin_required
def admin_user_edit(user_id):
    user = User.query.get_or_404(user_id)
    error = ""
    username_val = user.username or ""
    if request.method == "POST":
        username_val = (request.form.get("username") or "").strip()
        new_password = request.form.get("new_password") or ""
        confirm_password = request.form.get("confirm_password") or ""

        if not _is_valid_username(username_val):
            error = "用户名需为 3-20 位，仅支持字母、数字、下划线"
        elif (
            User.query
            .filter(func.lower(User.username) == username_val.lower(), User.id != user.id)
            .first()
        ):
            error = "用户名已存在"
        elif new_password and len(new_password) < 6:
            error = "新密码至少 6 位"
        elif new_password and new_password != confirm_password:
            error = "两次新密码输入不一致"
        else:
            old_username = user.username
            user.username = username_val
            changed = False
            if old_username != username_val:
                changed = True
            if new_password:
                user.set_password(new_password)
                changed = True
            if changed:
                db.session.commit()
                return redirect(url_for("admin_users", msg="已更新用户：{}".format(username_val)))
            return redirect(url_for("admin_users", msg="未检测到变更"))

    return render_template(
        "admin/user_form.html",
        page_title="编辑用户",
        submit_text="保存修改",
        action_url=url_for("admin_user_edit", user_id=user.id),
        error=error,
        username_val=username_val,
        user_id=user.id,
    )


@app.route("/admin/user/<int:user_id>/delete", methods=["POST"])
@admin_required
def admin_user_delete(user_id):
    user = User.query.get_or_404(user_id)
    if User.query.count() <= 1:
        return redirect(url_for("admin_users", error="至少保留一个用户，无法删除最后一个"))

    username = user.username or "用户"
    try:
        # 其他用户已收到的通知可能引用该用户为 actor，删除前置空避免外键冲突。
        ForumNotification.query.filter_by(actor_id=user.id).update({"actor_id": None}, synchronize_session=False)
        db.session.delete(user)
        db.session.commit()
        return redirect(url_for("admin_users", msg="已删除用户：{}".format(username)))
    except Exception:
        db.session.rollback()
        return redirect(url_for("admin_users", error="删除失败，请稍后重试"))


@app.route("/admin/user/<int:user_id>/ban", methods=["POST"])
@admin_required
def admin_user_ban(user_id):
    user = User.query.get_or_404(user_id)
    reason = (request.form.get("reason") or "").strip()
    if len(reason) > 255:
        reason = reason[:255]
    if user.is_banned:
        return redirect(url_for("admin_users", msg="用户已处于封禁状态：{}".format(user.username)))

    user.is_banned = True
    user.banned_at = datetime.now(timezone.utc)
    user.banned_reason = reason or "管理员封禁"
    db.session.commit()
    return redirect(url_for("admin_users", msg="已封禁用户：{}".format(user.username)))


@app.route("/admin/user/<int:user_id>/unban", methods=["POST"])
@admin_required
def admin_user_unban(user_id):
    user = User.query.get_or_404(user_id)
    if not user.is_banned:
        return redirect(url_for("admin_users", msg="用户未被封禁：{}".format(user.username)))

    user.is_banned = False
    user.banned_at = None
    user.banned_reason = None
    db.session.commit()
    return redirect(url_for("admin_users", msg="已解封用户：{}".format(user.username)))


@app.route("/admin/forum/posts")
@admin_required
def admin_forum_posts():
    keyword = (request.args.get("q") or "").strip()
    if len(keyword) > 80:
        keyword = keyword[:80]
    selected_category = (request.args.get("category") or "").strip() or None
    selected_author_id = request.args.get("author_id", type=int)

    comment_stats_subq = (
        db.session.query(
            ForumComment.post_id.label("post_id"),
            func.count(ForumComment.id).label("comment_count"),
        )
        .group_by(ForumComment.post_id)
        .subquery()
    )
    like_stats_subq = (
        db.session.query(
            ForumPostLike.post_id.label("post_id"),
            func.count(ForumPostLike.id).label("like_count"),
        )
        .group_by(ForumPostLike.post_id)
        .subquery()
    )
    bookmark_stats_subq = (
        db.session.query(
            ForumPostBookmark.post_id.label("post_id"),
            func.count(ForumPostBookmark.id).label("bookmark_count"),
        )
        .group_by(ForumPostBookmark.post_id)
        .subquery()
    )
    q = (
        db.session.query(
            ForumPost,
            func.coalesce(comment_stats_subq.c.comment_count, 0).label("comment_count"),
            User.username.label("author_name"),
            func.coalesce(like_stats_subq.c.like_count, 0).label("like_count"),
            func.coalesce(bookmark_stats_subq.c.bookmark_count, 0).label("bookmark_count"),
        )
        .outerjoin(comment_stats_subq, comment_stats_subq.c.post_id == ForumPost.id)
        .outerjoin(like_stats_subq, like_stats_subq.c.post_id == ForumPost.id)
        .outerjoin(bookmark_stats_subq, bookmark_stats_subq.c.post_id == ForumPost.id)
        .outerjoin(User, User.id == ForumPost.user_id)
    )
    if selected_category:
        q = q.filter(ForumPost.category == selected_category)
    if selected_author_id:
        q = q.filter(ForumPost.user_id == selected_author_id)
    if keyword:
        pattern = "%{}%".format(keyword)
        q = q.filter(
            or_(
                ForumPost.title.ilike(pattern),
                ForumPost.content.ilike(pattern),
                User.username.ilike(pattern),
            )
        )
    rows = q.order_by(ForumPost.is_pinned.desc(), ForumPost.created_at.desc(), ForumPost.id.desc()).limit(400).all()

    category_names = list(_get_forum_category_names(active_only=False))
    for (name,) in db.session.query(ForumPost.category).distinct().all():
        if name and name not in category_names:
            category_names.append(name)
    if selected_category and selected_category not in category_names:
        category_names.insert(0, selected_category)

    author_rows = (
        db.session.query(
            User.id,
            User.username,
            func.count(ForumPost.id).label("post_count"),
        )
        .outerjoin(ForumPost, ForumPost.user_id == User.id)
        .group_by(User.id)
        .order_by(func.count(ForumPost.id).desc(), User.username.asc())
        .limit(300)
        .all()
    )

    return render_template(
        "admin/forum_posts.html",
        rows=rows,
        category_names=category_names,
        author_rows=author_rows,
        keyword=keyword,
        selected_category=selected_category,
        selected_author_id=selected_author_id,
        msg=request.args.get("msg", ""),
        error=request.args.get("error", ""),
    )


@app.route("/admin/forum/post/<int:post_id>/moderate", methods=["POST"])
@admin_required
def admin_forum_post_moderate(post_id):
    post = ForumPost.query.get_or_404(post_id)
    action = (request.form.get("action") or "").strip().lower()
    if action == "pin":
        post.is_pinned = True
    elif action == "unpin":
        post.is_pinned = False
    elif action == "feature":
        post.is_featured = True
    elif action == "unfeature":
        post.is_featured = False
    elif action == "lock":
        post.is_locked = True
    elif action == "unlock":
        post.is_locked = False
    else:
        return redirect(url_for("admin_forum_posts", error="未知帖子管理动作"))
    db.session.commit()
    return redirect(url_for("admin_forum_posts", msg="已更新帖子 #{} 状态".format(post.id)))


@app.route("/admin/forum/post/new", methods=["GET", "POST"])
@admin_required
def admin_forum_post_new():
    error = ""
    users = _admin_load_user_options(limit=400)
    categories = _get_forum_category_names(active_only=False)
    if not categories:
        categories = list(DEFAULT_FORUM_CATEGORIES)
    selected_author_id = request.args.get("author_id", type=int) or (users[0].id if users else None)
    selected_category = request.args.get("category") or (categories[0] if categories else "综合讨论")
    is_pinned_val = False
    is_featured_val = False
    is_locked_val = False
    title_val = ""
    content_val = ""

    if request.method == "POST":
        selected_author_id = request.form.get("author_id", type=int)
        selected_category = (request.form.get("category") or "").strip() or selected_category
        is_pinned_val = bool(request.form.get("is_pinned"))
        is_featured_val = bool(request.form.get("is_featured"))
        is_locked_val = bool(request.form.get("is_locked"))
        title_val = (request.form.get("title") or "").strip()
        content_val = (request.form.get("content") or "").strip()

        author = db.session.get(User, selected_author_id or 0)
        if not author:
            error = "请选择有效作者"
        elif selected_category not in categories:
            error = "请选择有效分类"
        elif len(title_val) < 5:
            error = "标题至少 5 个字符"
        elif len(title_val) > 160:
            error = "标题不能超过 160 个字符"
        elif len(content_val) < 10:
            error = "内容至少 10 个字符"
        else:
            db.session.add(ForumPost(
                user_id=author.id,
                category=selected_category,
                title=title_val,
                content=content_val,
                is_pinned=is_pinned_val,
                is_featured=is_featured_val,
                is_locked=is_locked_val,
            ))
            db.session.commit()
            return redirect(url_for("admin_forum_posts", msg="已新增帖子"))

    if not users:
        error = error or "当前没有可用用户，请先在用户管理中新增用户"
    return render_template(
        "admin/forum_post_form.html",
        page_title="后台新增帖子",
        submit_text="创建帖子",
        action_url=url_for("admin_forum_post_new"),
        cancel_url=url_for("admin_forum_posts"),
        error=error,
        users=users,
        categories=categories,
        selected_author_id=selected_author_id,
        selected_category=selected_category,
        is_pinned_val=is_pinned_val,
        is_featured_val=is_featured_val,
        is_locked_val=is_locked_val,
        title_val=title_val,
        content_val=content_val,
        post_id=None,
    )


@app.route("/admin/forum/post/<int:post_id>/edit", methods=["GET", "POST"])
@admin_required
def admin_forum_post_edit(post_id):
    post = ForumPost.query.get_or_404(post_id)
    error = ""
    users = _admin_load_user_options(limit=400)
    categories = _get_forum_category_names(active_only=False)
    if post.category and post.category not in categories:
        categories.insert(0, post.category)

    selected_author_id = post.user_id
    selected_category = post.category or (categories[0] if categories else "综合讨论")
    is_pinned_val = bool(post.is_pinned)
    is_featured_val = bool(post.is_featured)
    is_locked_val = bool(post.is_locked)
    title_val = post.title or ""
    content_val = post.content or ""

    if request.method == "POST":
        selected_author_id = request.form.get("author_id", type=int)
        selected_category = (request.form.get("category") or "").strip() or selected_category
        is_pinned_val = bool(request.form.get("is_pinned"))
        is_featured_val = bool(request.form.get("is_featured"))
        is_locked_val = bool(request.form.get("is_locked"))
        title_val = (request.form.get("title") or "").strip()
        content_val = (request.form.get("content") or "").strip()

        author = db.session.get(User, selected_author_id or 0)
        if not author:
            error = "请选择有效作者"
        elif selected_category not in categories:
            error = "请选择有效分类"
        elif len(title_val) < 5:
            error = "标题至少 5 个字符"
        elif len(title_val) > 160:
            error = "标题不能超过 160 个字符"
        elif len(content_val) < 10:
            error = "内容至少 10 个字符"
        else:
            post.user_id = author.id
            post.category = selected_category
            post.is_pinned = is_pinned_val
            post.is_featured = is_featured_val
            post.is_locked = is_locked_val
            post.title = title_val
            post.content = content_val
            db.session.commit()
            return redirect(url_for("admin_forum_posts", msg="已更新帖子 #{}".format(post.id)))

    if not users:
        error = error or "当前没有可用用户，请先在用户管理中新增用户"
    return render_template(
        "admin/forum_post_form.html",
        page_title="后台编辑帖子",
        submit_text="保存修改",
        action_url=url_for("admin_forum_post_edit", post_id=post.id),
        cancel_url=url_for("admin_forum_posts"),
        error=error,
        users=users,
        categories=categories,
        selected_author_id=selected_author_id,
        selected_category=selected_category,
        is_pinned_val=is_pinned_val,
        is_featured_val=is_featured_val,
        is_locked_val=is_locked_val,
        title_val=title_val,
        content_val=content_val,
        post_id=post.id,
    )


@app.route("/admin/forum/post/<int:post_id>/delete", methods=["POST"])
@admin_required
def admin_forum_post_delete(post_id):
    post = ForumPost.query.get_or_404(post_id)
    db.session.delete(post)
    db.session.commit()
    return redirect(url_for("admin_forum_posts", msg="已删除帖子 #{}".format(post_id)))


@app.route("/admin/forum/comments")
@admin_required
def admin_forum_comments():
    keyword = (request.args.get("q") or "").strip()
    if len(keyword) > 80:
        keyword = keyword[:80]
    selected_author_id = request.args.get("author_id", type=int)
    selected_post_id = request.args.get("post_id", type=int)

    q = (
        db.session.query(
            ForumComment,
            ForumPost.title.label("post_title"),
            User.username.label("author_name"),
        )
        .join(ForumPost, ForumComment.post_id == ForumPost.id)
        .outerjoin(User, User.id == ForumComment.user_id)
    )
    if selected_post_id:
        q = q.filter(ForumComment.post_id == selected_post_id)
    if selected_author_id:
        q = q.filter(ForumComment.user_id == selected_author_id)
    if keyword:
        pattern = "%{}%".format(keyword)
        q = q.filter(
            or_(
                ForumComment.content.ilike(pattern),
                ForumPost.title.ilike(pattern),
                User.username.ilike(pattern),
            )
        )
    rows = q.order_by(ForumComment.created_at.desc(), ForumComment.id.desc()).limit(500).all()

    author_rows = (
        db.session.query(
            User.id,
            User.username,
            func.count(ForumComment.id).label("comment_count"),
        )
        .outerjoin(ForumComment, ForumComment.user_id == User.id)
        .group_by(User.id)
        .order_by(func.count(ForumComment.id).desc(), User.username.asc())
        .limit(300)
        .all()
    )
    post_rows = (
        db.session.query(
            ForumPost.id,
            ForumPost.title,
        )
        .order_by(ForumPost.created_at.desc(), ForumPost.id.desc())
        .limit(300)
        .all()
    )
    if selected_post_id and all(pid != selected_post_id for pid, _ in post_rows):
        selected_post = db.session.get(ForumPost, selected_post_id)
        if selected_post:
            post_rows = [(selected_post.id, selected_post.title)] + post_rows

    return render_template(
        "admin/forum_comments.html",
        rows=rows,
        author_rows=author_rows,
        post_rows=post_rows,
        keyword=keyword,
        selected_author_id=selected_author_id,
        selected_post_id=selected_post_id,
        msg=request.args.get("msg", ""),
        error=request.args.get("error", ""),
    )


@app.route("/admin/forum/comment/new", methods=["GET", "POST"])
@admin_required
def admin_forum_comment_new():
    error = ""
    post_options = _admin_load_post_options(limit=400)
    user_options = _admin_load_user_options(limit=400)
    selected_post_id = request.args.get("post_id", type=int) or (post_options[0].id if post_options else None)
    selected_user_id = request.args.get("user_id", type=int) or (user_options[0].id if user_options else None)
    post_options, user_options = _admin_fill_post_and_user_options(
        post_options,
        selected_post_id,
        user_options,
        selected_user_id,
    )

    content_val = ""
    if request.method == "POST":
        selected_post_id = request.form.get("post_id", type=int)
        selected_user_id = request.form.get("user_id", type=int)
        content_val = (request.form.get("content") or "").strip()
        post_options, user_options = _admin_fill_post_and_user_options(
            post_options,
            selected_post_id,
            user_options,
            selected_user_id,
        )
        target_post = db.session.get(ForumPost, selected_post_id or 0)
        target_user = db.session.get(User, selected_user_id or 0)
        if not target_post:
            error = "请选择有效帖子"
        elif not target_user:
            error = "请选择有效用户"
        elif len(content_val) < 2:
            error = "评论至少 2 个字符"
        else:
            db.session.add(ForumComment(
                post_id=target_post.id,
                user_id=target_user.id,
                content=content_val,
            ))
            db.session.commit()
            return redirect(url_for("admin_forum_comments", post_id=target_post.id, msg="已新增评论"))

    if not post_options:
        error = error or "暂无可评论的帖子，请先新增帖子"
    elif not user_options:
        error = error or "当前没有可用用户，请先在用户管理中新增用户"
    return render_template(
        "admin/forum_comment_form.html",
        page_title="后台新增评论",
        submit_text="创建评论",
        action_url=url_for("admin_forum_comment_new"),
        cancel_url=url_for("admin_forum_comments"),
        error=error,
        post_options=post_options,
        user_options=user_options,
        selected_post_id=selected_post_id,
        selected_user_id=selected_user_id,
        content_val=content_val,
        comment_id=None,
    )


@app.route("/admin/forum/comment/<int:comment_id>/edit", methods=["GET", "POST"])
@admin_required
def admin_forum_comment_edit(comment_id):
    comment = ForumComment.query.get_or_404(comment_id)
    error = ""
    post_options = _admin_load_post_options(limit=400)
    user_options = _admin_load_user_options(limit=400)
    selected_post_id = comment.post_id
    selected_user_id = comment.user_id
    post_options, user_options = _admin_fill_post_and_user_options(
        post_options,
        selected_post_id,
        user_options,
        selected_user_id,
    )
    content_val = comment.content or ""
    if request.method == "POST":
        selected_post_id = request.form.get("post_id", type=int)
        selected_user_id = request.form.get("user_id", type=int)
        content_val = (request.form.get("content") or "").strip()
        post_options, user_options = _admin_fill_post_and_user_options(
            post_options,
            selected_post_id,
            user_options,
            selected_user_id,
        )
        target_post = db.session.get(ForumPost, selected_post_id or 0)
        target_user = db.session.get(User, selected_user_id or 0)
        if not target_post:
            error = "请选择有效帖子"
        elif not target_user:
            error = "请选择有效用户"
        elif len(content_val) < 2:
            error = "评论至少 2 个字符"
        else:
            comment.post_id = target_post.id
            comment.user_id = target_user.id
            comment.content = content_val
            db.session.commit()
            return redirect(url_for("admin_forum_comments", post_id=target_post.id, msg="已更新评论 #{}".format(comment.id)))

    if not post_options:
        error = error or "暂无可评论的帖子，请先新增帖子"
    elif not user_options:
        error = error or "当前没有可用用户，请先在用户管理中新增用户"
    return render_template(
        "admin/forum_comment_form.html",
        page_title="后台编辑评论",
        submit_text="保存修改",
        action_url=url_for("admin_forum_comment_edit", comment_id=comment.id),
        cancel_url=url_for("admin_forum_comments", post_id=selected_post_id),
        error=error,
        post_options=post_options,
        user_options=user_options,
        selected_post_id=selected_post_id,
        selected_user_id=selected_user_id,
        content_val=content_val,
        comment_id=comment.id,
    )


@app.route("/admin/forum/comment/<int:comment_id>/delete", methods=["POST"])
@admin_required
def admin_forum_comment_delete(comment_id):
    comment = ForumComment.query.get_or_404(comment_id)
    post_id = comment.post_id
    db.session.delete(comment)
    db.session.commit()
    return redirect(url_for("admin_forum_comments", post_id=post_id, msg="已删除评论 #{}".format(comment_id)))


@app.route("/admin/plan/new", methods=["GET", "POST"])
@admin_required
def admin_plan_new():
    provider_id = request.args.get("provider_id", type=int)
    if request.method == "POST":
        return _save_plan(None)
    providers = Provider.query.order_by(Provider.name).all()
    return render_template(
        "admin/plan_form.html",
        plan=None,
        country_tags=COUNTRY_TAGS,
        providers=providers,
        preselected_provider_id=provider_id,
    )


@app.route("/admin/plan/<int:plan_id>/edit", methods=["GET", "POST"])
@admin_required
def admin_plan_edit(plan_id):
    plan = VPSPlan.query.get_or_404(plan_id)
    if request.method == "POST":
        return _save_plan(plan)
    return redirect(url_for("admin_dashboard"))


def _parse_optional_int(s):
    s = (s or "").strip()
    if not s:
        return None
    try:
        return int(s)
    except ValueError:
        return None


def _parse_optional_float(s):
    s = (s or "").strip()
    if not s:
        return None
    try:
        return float(s)
    except ValueError:
        return None


def _save_plan(plan):
    provider_id = request.form.get("provider_id", type=int)
    countries = request.form.get("countries", "").strip() or None
    vcpu = _parse_optional_int(request.form.get("vcpu"))
    memory_gb = _parse_optional_int(request.form.get("memory_gb"))
    storage_gb = _parse_optional_int(request.form.get("storage_gb"))
    bandwidth_mbps = _parse_optional_int(request.form.get("bandwidth_mbps"))
    traffic = request.form.get("traffic", "").strip() or None
    price_cny = _parse_optional_float(request.form.get("price_cny"))
    price_usd = _parse_optional_float(request.form.get("price_usd"))
    currency = request.form.get("currency", "CNY").strip() or "CNY"
    official_url = request.form.get("official_url", "").strip() or None

    provider = None
    if provider_id:
        provider = db.session.get(Provider, provider_id)
    if not provider:
        providers = Provider.query.order_by(Provider.name).all()
        return render_template(
            "admin/plan_form.html",
            plan=plan,
            country_tags=COUNTRY_TAGS,
            providers=providers,
            preselected_provider_id=provider_id,
            error="请选择厂商",
        )

    if plan is None:
        plan = VPSPlan(
            provider_id=provider.id,
            provider=provider.name,
            region=None,
            name=None,
            vcpu=vcpu,
            memory_gb=memory_gb,
            storage_gb=storage_gb,
            bandwidth_mbps=bandwidth_mbps,
            traffic=traffic,
            price_cny=price_cny,
            price_usd=price_usd,
            currency=currency,
            official_url=official_url,
            countries=countries,
        )
        db.session.add(plan)
    else:
        plan.provider_id = provider.id
        plan.provider = provider.name
        plan.region = None
        plan.name = None
        plan.vcpu = vcpu
        plan.memory_gb = memory_gb
        plan.storage_gb = storage_gb
        plan.bandwidth_mbps = bandwidth_mbps
        plan.traffic = traffic
        plan.price_cny = price_cny
        plan.price_usd = price_usd
        plan.currency = currency
        plan.official_url = official_url
        plan.countries = countries

    db.session.flush()
    _record_price_history(plan, source="manual")
    db.session.commit()
    # 若从厂商详情页进入添加，保存后返回该厂商详情
    from_provider_id = request.form.get("from_provider_id", type=int)
    if from_provider_id:
        return redirect(url_for("admin_provider_detail", provider_id=from_provider_id))
    return redirect(url_for("admin_dashboard"))


@app.route("/admin/plan/<int:plan_id>/delete", methods=["POST"])
@admin_required
def admin_plan_delete(plan_id):
    plan = VPSPlan.query.get_or_404(plan_id)
    PriceHistory.query.filter_by(plan_id=plan_id).delete()
    db.session.delete(plan)
    db.session.commit()
    return redirect(url_for("admin_dashboard"))


# ---------- Excel 导出 / 导入 ----------
EXCEL_HEADERS = [
    "厂商", "厂商官网", "国家", "vCPU", "内存GB", "存储GB", "带宽Mbps", "流量",
    "月付人民币", "月付美元", "货币", "配置官网",
]


@app.route("/admin/export/excel")
@admin_required
def admin_export_excel():
    wb = Workbook()
    ws = wb.active
    ws.title = "配置"
    ws.append(EXCEL_HEADERS)
    plans = VPSPlan.query.order_by(VPSPlan.provider, VPSPlan.price_cny).all()
    for p in plans:
        provider_url = (p.provider_rel.official_url if p.provider_rel else "") or ""
        ws.append([
            p.provider_name,
            provider_url or "",
            p.countries or "",
            p.vcpu if p.vcpu is not None else "",
            p.memory_gb if p.memory_gb is not None else "",
            p.storage_gb if p.storage_gb is not None else "",
            p.bandwidth_mbps if p.bandwidth_mbps is not None else "",
            p.traffic or "",
            p.price_cny if p.price_cny is not None else "",
            p.price_usd if p.price_usd is not None else "",
            p.currency or "CNY",
            p.official_url or "",
        ])
    buf = io.BytesIO()
    wb.save(buf)
    buf.seek(0)
    return send_file(
        buf,
        mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
        as_attachment=True,
        download_name="vps_配置_导出.xlsx",
    )


def _num(v):
    if v is None or v == "":
        return None
    try:
        return int(float(v))
    except (ValueError, TypeError):
        return None


def _float(v):
    if v is None or v == "":
        return None
    try:
        return float(v)
    except (ValueError, TypeError):
        return None


def _opt_text(v):
    if v is None:
        return None
    s = str(v).strip()
    return s or None


def _safe_str(v):
    if v is None:
        return ""
    return str(v).strip()


def _eq_optional(a, b):
    if a is None and b is None:
        return True
    if a is None or b is None:
        return False
    if isinstance(a, float) or isinstance(b, float):
        return abs(float(a) - float(b)) < 1e-9
    return a == b


def _record_price_history(plan, source):
    if plan is None:
        return
    if plan.price_cny is None and plan.price_usd is None:
        return
    if plan.id is None:
        db.session.flush()
    latest = (
        PriceHistory.query
        .filter_by(plan_id=plan.id)
        .order_by(PriceHistory.captured_at.desc(), PriceHistory.id.desc())
        .first()
    )
    currency = _opt_text(plan.currency) or "CNY"
    if latest:
        same_currency = _safe_str(latest.currency).upper() == _safe_str(currency).upper()
        if same_currency and _eq_optional(latest.price_cny, plan.price_cny) and _eq_optional(latest.price_usd, plan.price_usd):
            return
    db.session.add(PriceHistory(
        plan_id=plan.id,
        price_cny=plan.price_cny,
        price_usd=plan.price_usd,
        currency=currency,
        source=source,
    ))


def _display_val(v):
    if v is None or v == "":
        return "—"
    if isinstance(v, float):
        s = "{:.2f}".format(v).rstrip("0").rstrip(".")
        return s if s else "0"
    return str(v)


def _row_identity_key(row):
    return (
        _safe_str(row.get("厂商")),
        _num(row.get("vCPU")),
        _num(row.get("内存GB")),
        _num(row.get("存储GB")),
        _num(row.get("带宽Mbps")),
        _safe_str(row.get("国家")),
        _safe_str(row.get("流量")),
    )


def _plan_identity_key(plan):
    return (
        _safe_str(plan.provider_name),
        plan.vcpu,
        plan.memory_gb,
        plan.storage_gb,
        plan.bandwidth_mbps,
        _safe_str(plan.countries),
        _safe_str(plan.traffic),
    )


def _plan_diff(plan, row):
    """返回导入行相对于现有 plan 的差异列表。"""
    fields = [
        ("国家", "countries", _opt_text(row.get("国家"))),
        ("vCPU", "vcpu", _num(row.get("vCPU"))),
        ("内存GB", "memory_gb", _num(row.get("内存GB"))),
        ("存储GB", "storage_gb", _num(row.get("存储GB"))),
        ("带宽Mbps", "bandwidth_mbps", _num(row.get("带宽Mbps"))),
        ("流量", "traffic", _opt_text(row.get("流量"))),
        ("月付人民币", "price_cny", _float(row.get("月付人民币"))),
        ("月付美元", "price_usd", _float(row.get("月付美元"))),
        ("货币", "currency", _opt_text(row.get("货币")) or "CNY"),
        ("配置官网", "official_url", _opt_text(row.get("配置官网"))),
    ]
    diffs = []
    for label, attr, new_value in fields:
        old_value = getattr(plan, attr)
        if not _eq_optional(old_value, new_value):
            diffs.append({
                "label": label,
                "old": old_value,
                "new": new_value,
                "old_display": _display_val(old_value),
                "new_display": _display_val(new_value),
            })
    return diffs


def _upsert_provider_from_row(row):
    provider_name = _safe_str(row.get("厂商"))
    if not provider_name:
        return None
    imported_provider_url = _opt_text(row.get("厂商官网"))
    provider = Provider.query.filter_by(name=provider_name).first()
    if not provider:
        provider = Provider(name=provider_name, official_url=imported_provider_url)
        db.session.add(provider)
        db.session.flush()
    elif imported_provider_url and provider.official_url != imported_provider_url:
        provider.official_url = imported_provider_url
    return provider


def _fill_plan_from_row(plan, row, provider):
    plan.provider_id = provider.id
    plan.provider = provider.name
    plan.region = None
    plan.name = None
    plan.vcpu = _num(row.get("vCPU"))
    plan.memory_gb = _num(row.get("内存GB"))
    plan.storage_gb = _num(row.get("存储GB"))
    plan.bandwidth_mbps = _num(row.get("带宽Mbps"))
    plan.traffic = _opt_text(row.get("流量"))
    plan.price_cny = _float(row.get("月付人民币"))
    plan.price_usd = _float(row.get("月付美元"))
    plan.currency = _opt_text(row.get("货币")) or "CNY"
    plan.official_url = _opt_text(row.get("配置官网"))
    plan.countries = _opt_text(row.get("国家"))


@app.route("/admin/import", methods=["GET", "POST"])
@admin_required
def admin_import():
    if request.method == "GET":
        return render_template("admin/import.html")
    f = request.files.get("file")
    if not f or not f.filename:
        return render_template("admin/import.html", error="请选择 Excel 文件")
    if not f.filename.lower().endswith(".xlsx"):
        return render_template("admin/import.html", error="请上传 .xlsx 文件")
    try:
        wb = load_workbook(io.BytesIO(f.read()), read_only=True, data_only=True)
        ws = wb.active
        rows = list(ws.iter_rows(min_row=2, values_only=True))
    except Exception as e:
        return render_template("admin/import.html", error="解析失败: {}".format(str(e)))
    headers = EXCEL_HEADERS
    parsed = []
    for row in rows:
        if not any(cell is not None and str(cell).strip() for cell in row):
            continue
        d = {}
        for i, h in enumerate(headers):
            if i < len(row):
                v = row[i]
                if v is not None and hasattr(v, "strip"):
                    v = v.strip()
                d[h] = v
            else:
                d[h] = None
        parsed.append(d)
    if not parsed:
        return render_template("admin/import.html", error="文件中没有有效数据行")
    plans = VPSPlan.query.all()
    plan_index = {}
    for p in plans:
        key = _plan_identity_key(p)
        if key not in plan_index:
            plan_index[key] = p
    seen_row_keys = set()
    preview_items = []
    for row in parsed:
        key = _row_identity_key(row)
        provider_name = key[0]
        if not provider_name:
            continue
        if key in seen_row_keys:
            continue
        seen_row_keys.add(key)
        matched = plan_index.get(key)
        if not matched:
            preview_items.append({
                "action": "add",
                "row": row,
                "changes": [],
                "provider_url_changed": False,
            })
            continue
        changes = _plan_diff(matched, row)
        imported_provider_url = _opt_text(row.get("厂商官网"))
        old_provider_url = _opt_text(matched.provider_rel.official_url if matched.provider_rel else None)
        provider_url_changed = bool(imported_provider_url and imported_provider_url != old_provider_url)
        if changes or provider_url_changed:
            preview_items.append({
                "action": "update",
                "plan_id": matched.id,
                "row": row,
                "changes": changes,
                "provider_url_changed": provider_url_changed,
                "provider_url_old": old_provider_url,
                "provider_url_new": imported_provider_url,
            })
    session["import_preview"] = preview_items
    return redirect(url_for("admin_import_preview"))


@app.route("/admin/import/preview", methods=["GET", "POST"])
@admin_required
def admin_import_preview():
    preview_items = session.get("import_preview") or []
    add_count = sum(1 for x in preview_items if x.get("action") == "add")
    update_count = sum(1 for x in preview_items if x.get("action") == "update")
    if request.method == "GET":
        return render_template(
            "admin/import_preview.html",
            rows=list(enumerate(preview_items)),
            add_count=add_count,
            update_count=update_count,
        )
    selected = request.form.getlist("row_index")
    if not selected:
        return render_template(
            "admin/import_preview.html",
            rows=list(enumerate(preview_items)),
            add_count=add_count,
            update_count=update_count,
            error="请至少勾选一行",
        )
    indices = sorted(set(int(x) for x in selected if x.isdigit()))
    add_applied = 0
    update_applied = 0
    for i in indices:
        if i < 0 or i >= len(preview_items):
            continue
        item = preview_items[i]
        row = item.get("row") or {}
        provider = _upsert_provider_from_row(row)
        if not provider:
            continue
        action = item.get("action")
        if action == "update":
            plan = db.session.get(VPSPlan, item.get("plan_id"))
            if not plan:
                plan = VPSPlan()
                db.session.add(plan)
                add_applied += 1
            else:
                update_applied += 1
            _fill_plan_from_row(plan, row, provider)
        else:
            plan = VPSPlan()
            _fill_plan_from_row(plan, row, provider)
            db.session.add(plan)
            add_applied += 1
        _record_price_history(plan, source="import")
    db.session.commit()
    session.pop("import_preview", None)
    msg = "已新增 {} 条，更新 {} 条配置".format(add_applied, update_applied)
    return redirect(url_for("admin_dashboard") + "?" + urlencode({"msg": msg}))


if __name__ == "__main__":
    app.run(debug=True, port=5001)