(function () {
  'use strict';

  var Api = function () { return window.AdminApi; };
  var Ui = function () { return window.AdminUi; };
  var I = function () { return window.AdminI18n; };

  function statCard(label, value, opts) {
    opts = opts || {};
    var inner = '<div class="soon-admin-stat__label">' + I().esc(label) +
      '</div><div class="soon-admin-stat__value">' + I().esc(value) + '</div>';
    if (opts.hint) inner += '<div class="soon-admin-stat__hint">' + I().esc(opts.hint) + '</div>';
    if (opts.href) {
      return '<a class="soon-admin-stat soon-admin-stat--link" href="' + I().esc(opts.href) + '">' + inner + '</a>';
    }
    return '<div class="soon-admin-stat">' + inner + '</div>';
  }

  function alertBar(d) {
    var parts = [];
    if (d.orders_pending > 0) parts.push('待支付订单 <strong>' + d.orders_pending + '</strong> 笔');
    if (d.refunds_pending > 0) parts.push('退款待审核 <strong>' + d.refunds_pending + '</strong> 笔');
    if (!parts.length) return '';
    var href = '#/orders';
    if (d.refunds_pending > 0) href = '#/orders?refund_status=pending';
    else if (d.orders_pending > 0) href = '#/orders?status=pending';
    return '<div class="soon-admin-alert-bar"><span>' + parts.join(' · ') + '</span>' +
      '<a href="' + href + '" class="soon-btn soon-btn--sm">去处理</a></div>';
  }

  function quickLinks() {
    var links = [
      { href: '#/users', label: '用户管理' },
      { href: '#/orders', label: '订单管理' },
      { href: '#/plans', label: '套餐配置' },
      { href: '#/payment', label: '支付密钥' },
      { href: '#/settings', label: '系统设置' },
      { href: '#/audits', label: '审计日志' },
    ];
    var level = (window.AdminState && AdminState.adminLevel) || 'full';
    var visible = window.AdminPermissions
      ? AdminPermissions.filterQuickLinks(links, level)
      : links;
    var items = visible.map(function (l) {
      return '<a class="soon-admin-quick-link" href="' + l.href + '">' + I().esc(l.label) + '</a>';
    }).join('');
    return '<div class="soon-admin-card"><h3 class="soon-admin-card__title">快捷入口</h3>' +
      '<div class="soon-admin-quick-grid">' + items + '</div></div>';
  }

  function recentOrdersTable(orders) {
    var rows = (orders || []).map(function (o) {
      return '<tr><td>' + I().esc(o.order_no || o.id) + '</td><td>' + I().esc(o.email || '') + '</td><td>' +
        I().formatCents(o.amount_cents) + '</td><td>' + I().badgeStatus(o.status) + '</td><td>' +
        I().formatDateTime(o.created_at) + '</td></tr>';
    }).join('');
    return Ui().dataTable(['订单号', '用户', '金额', '状态', '时间'], rows, 5);
  }

  function render() {
    var panel = Ui().el('panel-dashboard');
    if (!panel) return;
    panel.innerHTML = '<div class="soon-admin-page">' +
      Ui().pageHeader('运营概览', '关键指标、待办提醒与最近订单',
        '<button type="button" class="soon-btn soon-btn--sm soon-btn--ghost" id="dashRefresh">刷新</button>') +
      Ui().skeletonStats(6) +
      '<div class="soon-admin-dash-grid">' +
      '<div class="soon-admin-card"><h3 class="soon-admin-card__title">最近订单</h3>' + Ui().skeletonTable() + '</div>' +
      '<div class="soon-skeleton soon-skeleton--h160"></div></div></div>';

    function fetchStats(showLoading) {
      var btn = Ui().el('dashRefresh');
      if (showLoading && btn) Ui().setBtnLoading(btn, true, '刷新中…');
      Api().get('stats').then(function (j) {
        if (showLoading && btn) Ui().setBtnLoading(btn, false);
        if (!j) {
          panel.innerHTML = '<div class="soon-admin-page">' +
            Ui().pageHeader('运营概览', '关键指标、待办提醒与最近订单',
              '<button type="button" class="soon-btn soon-btn--sm soon-btn--ghost" id="dashRefresh">刷新</button>') +
            Ui().listError('概览数据加载失败', 'dashRetry') + '</div>';
          Ui().el('dashRetry').onclick = render;
          Ui().el('dashRefresh').onclick = function () { fetchStats(true); };
          return;
        }
        paintDashboard(panel, j.data);
      });
    }

    Ui().el('dashRefresh').onclick = function () { fetchStats(true); };
    fetchStats(false);
  }

  function paintDashboard(panel, d) {
    var stats =
      statCard('用户总数', d.users, { href: '#/users', hint: '点击进入用户管理' }) +
      statCard('订单总数', d.orders, { href: '#/orders', hint: '含全部状态' }) +
      statCard('今日订单', d.orders_today, { href: '#/orders', hint: '按创建日统计' }) +
      statCard('待支付', d.orders_pending || 0, { href: '#/orders?status=pending', hint: '需关注超时未付' }) +
      statCard('活跃订阅', d.active_subscriptions, { href: '#/users', hint: '有效会员数' }) +
      statCard('今日收入', I().formatCents(d.revenue_today_cents), { href: '#/orders', hint: '已支付订单' }) +
      statCard('云端文件', d.files_total, { hint: '未删除的设计文件' }) +
      statCard('退款待审', d.refunds_pending || 0, { href: '#/orders?refund_status=pending', hint: '需在订单页处理' });

    panel.innerHTML = '<div class="soon-admin-page">' +
      Ui().pageHeader('运营概览', '关键指标、待办提醒与最近订单',
        '<button type="button" class="soon-btn soon-btn--sm soon-btn--ghost" id="dashRefresh">刷新</button>' +
        '<a href="#/orders" class="soon-btn soon-btn--sm">全部订单</a>') +
      alertBar(d) +
      '<div class="soon-admin-stat-grid soon-admin-stat-grid--dash">' + stats + '</div>' +
      '<div class="soon-admin-dash-grid">' +
      '<div class="soon-admin-card"><div class="soon-admin-card__head-row">' +
      '<h3 class="soon-admin-card__title">最近订单</h3>' +
      '<a href="#/orders" class="soon-admin-card__link">查看全部</a></div>' +
      recentOrdersTable(d.recent_orders) + '</div>' +
      quickLinks() + '</div></div>';

    Ui().el('dashRefresh').onclick = render;
  }

  window.AdminViews = window.AdminViews || {};
  window.AdminViews.dashboard = { render: render };
})();