"""
Admin API routes for managing core data.
"""
from typing import List, Optional
from datetime import datetime
from django.utils import timezone
from ninja import Router, Schema
from ninja.errors import HttpError
from ninja_jwt.authentication import JWTAuth
from ninja.pagination import paginate, PageNumberPagination

from apps.users.models import User
from apps.products.models import Product, Website, Category
from apps.bounties.models import Bounty, BountyDispute, PaymentEvent

router = Router()


def require_admin(user):
    if not user or user.role != 'admin' or not user.is_active:
        raise HttpError(403, "仅管理员可访问")


class UserOut(Schema):
    id: int
    open_id: str
    name: Optional[str] = None
    role: str
    is_active: bool
    created_at: datetime


class UserUpdateIn(Schema):
    role: Optional[str] = None
    is_active: Optional[bool] = None


class SimpleOut(Schema):
    id: int
    name: str


class BountyAdminOut(Schema):
    id: int
    title: str
    status: str
    reward: str
    publisher_id: int
    acceptor_id: Optional[int] = None
    is_escrowed: bool
    is_paid: bool
    created_at: datetime

    class Config:
        from_attributes = True

    @staticmethod
    def resolve_reward(obj):
        return str(obj.reward)


class PaymentEventOut(Schema):
    id: int
    event_id: str
    event_type: str
    bounty_id: Optional[int] = None
    success: bool
    processed_at: datetime

    class Config:
        from_attributes = True


class DisputeOut(Schema):
    id: int
    bounty_id: int
    initiator_id: int
    status: str
    created_at: datetime

    class Config:
        from_attributes = True


@router.get("/users/", response=List[UserOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=20)
def list_users(request):
    require_admin(request.auth)
    return User.objects.all().order_by('-created_at')


@router.patch("/users/{user_id}", response=UserOut, auth=JWTAuth())
def update_user(request, user_id: int, data: UserUpdateIn):
    require_admin(request.auth)
    try:
        user = User.objects.get(id=user_id)
    except User.DoesNotExist:
        raise HttpError(404, "用户不存在")
    update_data = data.dict(exclude_unset=True)
    for key, value in update_data.items():
        setattr(user, key, value)
    user.save()
    return user


@router.get("/categories/", response=List[SimpleOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=50)
def list_categories(request):
    require_admin(request.auth)
    return Category.objects.values('id', 'name').order_by('name')


@router.get("/websites/", response=List[SimpleOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=50)
def list_websites(request):
    require_admin(request.auth)
    return Website.objects.values('id', 'name').order_by('name')


@router.get("/products/", response=List[SimpleOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=50)
def list_products(request):
    require_admin(request.auth)
    return Product.objects.values('id', 'name').order_by('-created_at')


@router.get("/bounties/", response=List[BountyAdminOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=20)
def list_bounties(request, status: Optional[str] = None):
    require_admin(request.auth)
    queryset = Bounty.objects.select_related("publisher", "acceptor").all().order_by('-created_at')
    if status:
        queryset = queryset.filter(status=status)
    return queryset


@router.get("/disputes/", response=List[DisputeOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=20)
def list_disputes(request, status: Optional[str] = None):
    require_admin(request.auth)
    disputes = BountyDispute.objects.all().order_by('-created_at')
    if status:
        disputes = disputes.filter(status=status)
    return disputes


@router.get("/payments/", response=List[PaymentEventOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=20)
def list_payment_events(request):
    require_admin(request.auth)
    return PaymentEvent.objects.all().order_by('-processed_at')


# ==================== Product Review ====================

class ProductAdminOut(Schema):
    """Product admin output schema with all fields."""
    id: int
    name: str
    description: Optional[str] = None
    image: Optional[str] = None
    images: List[str] = []
    category_id: int
    category_name: Optional[str] = None
    status: str
    submitted_by_id: Optional[int] = None
    submitted_by_name: Optional[str] = None
    reject_reason: Optional[str] = None
    reviewed_at: Optional[datetime] = None
    created_at: datetime
    updated_at: datetime

    @staticmethod
    def resolve_category_name(obj):
        return obj.category.name if obj.category else None

    @staticmethod
    def resolve_submitted_by_name(obj):
        if obj.submitted_by:
            return obj.submitted_by.name or obj.submitted_by.open_id
        return None


class ProductReviewIn(Schema):
    """Product review input schema."""
    approved: bool
    reject_reason: Optional[str] = None


class ProductImagesIn(Schema):
    """Product images update input schema."""
    images: List[str] = []
    image: Optional[str] = None


@router.get("/products/pending/", response=List[ProductAdminOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=20)
def list_pending_products(request):
    """List all pending products for review."""
    require_admin(request.auth)
    return Product.objects.select_related("category", "submitted_by").filter(
        status='pending'
    ).order_by('-created_at')


@router.get("/products/all/", response=List[ProductAdminOut], auth=JWTAuth())
@paginate(PageNumberPagination, page_size=20)
def list_all_products(request, status: Optional[str] = None):
    """List all products with optional status filter."""
    require_admin(request.auth)
    queryset = Product.objects.select_related("category", "submitted_by").order_by('-created_at')
    if status:
        queryset = queryset.filter(status=status)
    return queryset


@router.post("/products/{product_id}/review/", response=ProductAdminOut, auth=JWTAuth())
def review_product(request, product_id: int, data: ProductReviewIn):
    """Approve or reject a product."""
    require_admin(request.auth)
    
    try:
        product = Product.objects.select_related("category", "submitted_by").get(id=product_id)
    except Product.DoesNotExist:
        raise HttpError(404, "商品不存在")
    
    if product.status != 'pending':
        raise HttpError(400, "只能审核待审核状态的商品")
    
    if data.approved:
        product.status = 'approved'
        product.reject_reason = None
    else:
        if not data.reject_reason:
            raise HttpError(400, "拒绝时需要提供原因")
        product.status = 'rejected'
        product.reject_reason = data.reject_reason
    
    product.reviewed_at = timezone.now()
    product.save()
    
    return product


@router.put("/products/{product_id}/images/", response=ProductAdminOut, auth=JWTAuth())
def update_product_images(request, product_id: int, data: ProductImagesIn):
    require_admin(request.auth)
    try:
        product = Product.objects.select_related("category", "submitted_by").get(id=product_id)
    except Product.DoesNotExist:
        raise HttpError(404, "商品不存在")

    max_images = 6
    images = [url.strip() for url in (data.images or []) if url and url.strip()]
    image = (data.image or "").strip() or (images[0] if images else None)
    if image and image not in images:
        images.insert(0, image)
    if len(images) > max_images:
        raise HttpError(400, f"最多上传{max_images}张图片")

    product.image = image or None
    product.images = images
    product.save(update_fields=["image", "images", "updated_at"])
    return product