(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 = [];

    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 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;
        }

        tableBody.innerHTML = plans.map(function (plan) {
            const url = (plan.official_url || "").trim();
            const linkCell = url
                ? '<a href="' + escapeAttr(url) + '" target="_blank" rel="noopener noreferrer">官网</a>'
                : "—";
            return (
                '<tr>' +
                '<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('');
    }

    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() {
        const filtered = applyFilters();
        renderTable(filtered);
    }

    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();
    });

    fetch('/api/plans')
        .then(function (res) { return res.json(); })
        .then(function (plans) {
            allPlans = plans;
            fillFilterOptions();
            refresh();
        })
        .catch(function () {
            tableBody.innerHTML = '<tr><td colspan="10" class="empty-state"><p>加载失败，请刷新页面</p></td></tr>';
        });
})();