(function () {
    const tableBody = document.getElementById('table-body');
    const filterProvider = document.getElementById('filter-provider');
    const filterRegion = document.getElementById('filter-region');
    const filterMemory = document.getElementById('filter-memory');
    const filterCurrency = document.getElementById('filter-currency');
    const btnReset = document.getElementById('btn-reset');

    let allPlans = [];
    let isLoading = false;

    function unique(values) {
        return [...new Set(values)].filter(Boolean).sort();
    }

    function getDisplayRegion(plan) {
        return (plan.countries && plan.countries.trim()) ? plan.countries.trim() : (plan.region || "—");
    }

    function getAllRegionOptions(plans) {
        const set = new Set();
        plans.forEach(function (p) {
            if (p.countries) {
                p.countries.split(',').forEach(function (s) {
                    const t = s.trim();
                    if (t) set.add(t);
                });
            }
            if (p.region && p.region.trim()) set.add(p.region.trim());
        });
        return unique([...set]);
    }

    function fillFilterOptions() {
        const providers = unique(allPlans.map(function (p) { return p.provider; }));
        const regions = getAllRegionOptions(allPlans);

        filterProvider.innerHTML = '<option value="">全部</option>';
        providers.forEach(function (p) {
            const opt = document.createElement('option');
            opt.value = p;
            opt.textContent = p;
            filterProvider.appendChild(opt);
        });

        filterRegion.innerHTML = '<option value="">全部</option>';
        regions.forEach(function (r) {
            const opt = document.createElement('option');
            opt.value = r;
            opt.textContent = r;
            filterRegion.appendChild(opt);
        });
    }

    function formatPrice(plan) {
        const isCNY = filterCurrency.value === 'CNY';
        let price = isCNY ? plan.price_cny : plan.price_usd;
        let symbol = isCNY ? '¥' : '$';
        if (price == null || price === '' || isNaN(price)) {
            price = isCNY ? plan.price_usd : plan.price_cny;
            symbol = isCNY ? '$' : '¥';
        }
        if (price == null || price === '' || isNaN(price)) return "—";
        return symbol + Number(price).toLocaleString();
    }

    function showVal(val, suffix) {
        if (val == null || val === '' || (typeof val === 'number' && isNaN(val))) return "—";
        return suffix ? val + suffix : val;
    }

    function applyFilters() {
        const provider = filterProvider.value;
        const region = filterRegion.value;
        const memoryMin = parseInt(filterMemory.value, 10) || 0;

        return allPlans.filter(function (plan) {
            if (provider && plan.provider !== provider) return false;
            if (region) {
                const matchRegion = getDisplayRegion(plan) === region ||
                    (plan.countries && plan.countries.split(',').map(function (s) { return s.trim(); }).indexOf(region) !== -1) ||
                    plan.region === region;
                if (!matchRegion) return false;
            }
            if (memoryMin && (plan.memory_gb == null || plan.memory_gb < memoryMin)) return false;
            return true;
        });
    }

    function showLoadingSkeleton() {
        const colCount = 10;
        const skeletonRows = Array(5).fill(0).map(function() {
            return '<tr class="loading-row"><td colspan="' + colCount + '"></td></tr>';
        }).join('');
        tableBody.innerHTML = skeletonRows;
    }

    function renderTable(plans) {
        const colCount = 10;
        if (plans.length === 0) {
            tableBody.innerHTML = '<tr><td colspan="' + colCount + '" class="empty-state"><p>🔍 没有符合条件的方案</p></td></tr>';
            return;
        }

        // 添加淡入动画
        tableBody.style.opacity = '0';

        tableBody.innerHTML = plans.map(function (plan, index) {
            const url = (plan.official_url || "").trim();
            const linkCell = url
                ? '<a href="' + escapeAttr(url) + '" target="_blank" rel="noopener noreferrer">🔗 官网</a>'
                : "—";
            return (
                '<tr style="animation: fadeIn 0.3s ease-in-out ' + (index * 0.02) + 's forwards; opacity: 0;">' +
                '<td class="provider">' + escapeHtml(plan.provider) + '</td>' +
                '<td class="region">' + escapeHtml(getDisplayRegion(plan)) + '</td>' +
                '<td>' + escapeHtml(plan.name) + '</td>' +
                '<td>' + showVal(plan.vcpu) + '</td>' +
                '<td>' + showVal(plan.memory_gb, ' GB') + '</td>' +
                '<td>' + showVal(plan.storage_gb, ' GB') + '</td>' +
                '<td>' + showVal(plan.bandwidth_mbps, ' Mbps') + '</td>' +
                '<td>' + (plan.traffic ? escapeHtml(plan.traffic) : '—') + '</td>' +
                '<td class="col-price">' + formatPrice(plan) + '</td>' +
                '<td class="col-link">' + linkCell + '</td>' +
                '</tr>'
            );
        }).join('');

        // 触发淡入
        setTimeout(function() {
            tableBody.style.opacity = '1';
        }, 10);
    }

    function escapeAttr(s) {
        const div = document.createElement('div');
        div.textContent = s;
        return div.innerHTML.replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
    }

    function escapeHtml(s) {
        if (s == null || s === '') return '';
        const div = document.createElement('div');
        div.textContent = String(s);
        return div.innerHTML;
    }

    function refresh() {
        if (isLoading) return;
        const filtered = applyFilters();
        renderTable(filtered);

        // 更新结果计数
        updateResultCount(filtered.length);
    }

    function updateResultCount(count) {
        const existingCount = document.querySelector('.result-count');
        if (existingCount) {
            existingCount.textContent = '共 ' + count + ' 条结果';
        }
    }

    filterProvider.addEventListener('change', refresh);
    filterRegion.addEventListener('change', refresh);
    filterMemory.addEventListener('change', refresh);
    filterCurrency.addEventListener('change', refresh);

    btnReset.addEventListener('click', function () {
        filterProvider.value = '';
        filterRegion.value = '';
        filterMemory.value = '0';
        filterCurrency.value = 'CNY';
        refresh();
    });

    // 显示加载状态
    isLoading = true;
    showLoadingSkeleton();

    fetch('/api/plans')
        .then(function (res) {
            if (!res.ok) throw new Error('Network response was not ok');
            return res.json();
        })
        .then(function (plans) {
            allPlans = plans;
            fillFilterOptions();
            isLoading = false;
            refresh();

            // 添加结果计数显示
            const filters = document.querySelector('.filters');
            if (filters && !document.querySelector('.result-count')) {
                const countEl = document.createElement('div');
                countEl.className = 'result-count';
                countEl.style.cssText = 'margin-left: auto; color: var(--text-muted); font-size: 0.9rem;';
                countEl.textContent = '共 ' + plans.length + ' 条结果';
                filters.appendChild(countEl);
            }
        })
        .catch(function (error) {
            isLoading = false;
            console.error('加载失败:', error);
            tableBody.innerHTML = '<tr><td colspan="10" class="empty-state"><p>❌ 加载失败，请刷新页面重试</p></td></tr>';
        });

    // 添加 CSS 动画
    const style = document.createElement('style');
    style.textContent = `
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .table-wrap { transition: opacity 0.3s ease; }
    `;
    document.head.appendChild(style);
})();