'use client';

import { useEffect, useRef, useState } from 'react';
import { usePathname, useRouter } from 'next/navigation';
import {
  BarChartOutlined,
  DashboardOutlined,
  DatabaseOutlined,
  FileSearchOutlined,
  FlagOutlined,
  GiftOutlined,
  HeartOutlined,
  LineChartOutlined,
  LogoutOutlined,
  MessageOutlined,
  MoneyCollectOutlined,
  NotificationOutlined,
  ProfileOutlined,
  SafetyCertificateOutlined,
  SettingOutlined,
  ShareAltOutlined,
  TeamOutlined,
  UserOutlined,
} from '@ant-design/icons';
import { Avatar, Dropdown, Layout, Tooltip } from 'antd';
import { api } from '@/lib/api';
import { clearAuth, getAdmin, getToken, setAuth } from '@/lib/auth';
import {
  REVIEW_BADGE_REFRESH_EVENT,
  type ReviewBadgeKey,
} from '@/lib/reviewBadge';
import type {
  AdminInfo,
  FeedbackSummary,
  PriceReportSummary,
  WithdrawSummary,
} from '@/lib/types';

const { Sider, Header, Content } = Layout;

type NavItem = {
  key: string;
  icon: React.ReactNode;
  label: string;
};

type NavGroup =
  | (NavItem & { children?: never })
  | {
      key: string;
      icon: React.ReactNode;
      label: string;
      children: NavItem[];
    };

const hasChildren = (group: NavGroup): group is NavGroup & { children: NavItem[] } =>
  Array.isArray(group.children);

const NAV_GROUPS: NavGroup[] = [
  {
    key: 'dashboard',
    icon: <DashboardOutlined />,
    label: '看板',
    children: [
      { key: '/dashboard', icon: <DashboardOutlined />, label: '数据大盘' },
      { key: '/ad-revenue-report', icon: <BarChartOutlined />, label: '广告收益' },
      { key: '/comparison-records', icon: <ProfileOutlined />, label: '比价记录' },
      { key: '/coupon-data', icon: <GiftOutlined />, label: '领券记录' },
      { key: '/cps', icon: <ShareAltOutlined />, label: 'CPS收益' },
    ],
  },
  {
    key: 'reward-review',
    icon: <MoneyCollectOutlined />,
    label: '奖励审核',
    children: [
      { key: '/withdraws', icon: <MoneyCollectOutlined />, label: '提现审核' },
      { key: '/price-reports', icon: <FlagOutlined />, label: '低价审核' },
      { key: '/feedbacks', icon: <MessageOutlined />, label: '用户反馈' },
    ],
  },
  {
    key: 'data-config',
    icon: <SettingOutlined />,
    label: '数据配置',
    children: [
      { key: '/config', icon: <SettingOutlined />, label: '系统配置' },
      { key: '/ad-revenue', icon: <NotificationOutlined />, label: '广告配置' },
      { key: '/huawei-review', icon: <SafetyCertificateOutlined />, label: '华为审核开关' },
      { key: '/users', icon: <UserOutlined />, label: '用户管理' },
    ],
  },
  {
    key: 'monitoring-audit',
    icon: <FileSearchOutlined />,
    label: '监控审计',
    children: [
      { key: '/device-liveness', icon: <HeartOutlined />, label: '设备存活' },
      { key: '/analytics-health', icon: <LineChartOutlined />, label: '埋点成功率' },
      { key: '/event-logs', icon: <DatabaseOutlined />, label: '埋点日志' },
      { key: '/audit-logs', icon: <FileSearchOutlined />, label: '审计日志' },
    ],
  },
  { key: '/admins', icon: <TeamOutlined />, label: '权限管理' },
];

// 导航项 key(/dashboard)→ 权限页 key(dashboard),与后端 permissions.py 目录对齐
const permOf = (key: string) => key.replace(/^\//, '');

export default function MainLayout({ children }: { children: React.ReactNode }) {
  const router = useRouter();
  const pathname = usePathname();
  const [admin, setAdmin] = useState<AdminInfo | null>(null);
  const [collapsed, setCollapsed] = useState(false);
  const [pendingReviewCounts, setPendingReviewCounts] = useState<Partial<Record<ReviewBadgeKey, number>>>({});
  const reviewRefreshVersion = useRef<Partial<Record<ReviewBadgeKey, number>>>({});

  useEffect(() => {
    const token = getToken();
    if (!token) {
      router.replace('/login');
      return;
    }
    setAdmin(getAdmin()); // 先用本地存的(快、不闪)
    // 再拉 /me 刷新有效可见页:超管改过该角色权限也能及时反映到左侧导航
    api
      .get<AdminInfo>('/admin/api/auth/me')
      .then(({ data }) => {
        setAdmin(data);
        setAuth(token, data);
      })
      .catch(() => {});
  }, [router]);

  useEffect(() => {
    if (!admin) return;
    const canAccess = (page: string) =>
      admin.role === 'super_admin' || !admin.pages || admin.pages.includes(page);

    const refresh = async (key: ReviewBadgeKey) => {
      if (!canAccess(key.slice(1))) return;
      const version = (reviewRefreshVersion.current[key] ?? 0) + 1;
      reviewRefreshVersion.current[key] = version;
      let count: number;
      if (key === '/withdraws') {
        count = (await api.get<WithdrawSummary>('/admin/api/withdraws/summary')).data.reviewing_count;
      } else if (key === '/price-reports') {
        count = (await api.get<PriceReportSummary>('/admin/api/price-reports/summary')).data.pending;
      } else {
        count = (await api.get<FeedbackSummary>('/admin/api/feedbacks/summary')).data.pending;
      }
      if (reviewRefreshVersion.current[key] !== version) return;
      setPendingReviewCounts((current) => ({ ...current, [key]: count }));
    };

    const refreshSafely = (key: ReviewBadgeKey) => refresh(key).catch(() => {});
    void Promise.all([
      refreshSafely('/withdraws'),
      refreshSafely('/price-reports'),
      refreshSafely('/feedbacks'),
    ]);

    const onReviewCompleted = (event: Event) => {
      const key = (event as CustomEvent<ReviewBadgeKey>).detail;
      if (key) void refreshSafely(key);
    };
    window.addEventListener(REVIEW_BADGE_REFRESH_EVENT, onReviewCompleted);
    return () => {
      window.removeEventListener(REVIEW_BADGE_REFRESH_EVENT, onReviewCompleted);
    };
  }, [admin]);

  if (!admin) return null; // 守卫期间不闪烁内容

  // 选中态:取路径一级(/users/123 -> /users)
  const selectedKey = '/' + (pathname.split('/')[1] || 'dashboard');
  // 叶子导航项按当前角色的有效可见页过滤:super_admin 恒可见;缺 pages 信息(旧登录)兜底全显示不锁死。
  const isSuper = admin.role === 'super_admin';
  const canShowLeaf = (item: { key: string }) =>
    isSuper || !admin.pages || admin.pages.includes(permOf(item.key));
  const visibleGroups = NAV_GROUPS
    .map((group) => {
      if (!hasChildren(group)) return group;
      return { ...group, children: group.children.filter(canShowLeaf) };
    })
    .filter((group) => (hasChildren(group) ? group.children.length > 0 : canShowLeaf(group)));
  const flatNavItems = visibleGroups.flatMap((group) =>
    hasChildren(group) ? group.children : [group],
  );

  const reviewBadge = (key: string) => {
    const count = pendingReviewCounts[key as ReviewBadgeKey] ?? 0;
    if (count <= 0) return null;
    return (
      <span
        className="nav-review-badge"
        aria-label={`${count} 条未审核`}
        title={`${count} 条未审核`}
      >
        {count}
      </span>
    );
  };

  const logout = () => {
    clearAuth();
    router.replace('/login');
  };

  return (
    <Layout style={{ minHeight: '100vh' }}>
      <Sider
        theme="dark"
        breakpoint="lg"
        collapsible
        collapsed={collapsed}
        collapsedWidth={72}
        width={220}
        onCollapse={setCollapsed}
        style={{
          position: 'sticky',
          top: 0,
          height: '100vh',
          overflowY: 'auto',
          overflowX: 'hidden',
        }}
      >
        <nav className={`side-nav${collapsed ? ' side-nav-collapsed' : ''}`} aria-label="后台导航">
          {collapsed
            ? flatNavItems.map((item) => (
                <Tooltip key={item.key} title={item.label} placement="right">
                  <button
                    type="button"
                    className={`nav-icon-button${selectedKey === item.key ? ' is-selected' : ''}`}
                    onClick={() => router.push(item.key)}
                    aria-label={item.label}
                  >
                    {item.icon}
                    {reviewBadge(item.key)}
                  </button>
                </Tooltip>
              ))
            : visibleGroups.map((group) => {
                const isGroup = hasChildren(group);
                const groupSelected = isGroup
                  ? group.children.some((child) => child.key === selectedKey)
                  : selectedKey === group.key;
                if (!isGroup) {
                  return (
                    <button
                      key={group.key}
                      type="button"
                      className={`nav-primary nav-direct${groupSelected ? ' is-selected' : ''}`}
                      onClick={() => router.push(group.key)}
                    >
                      <span className="nav-primary-icon">{group.icon}</span>
                      <span className="nav-item-label">{group.label}</span>
                      {reviewBadge(group.key)}
                    </button>
                  );
                }
                return (
                  <section key={group.key} className={`nav-group${groupSelected ? ' is-active' : ''}`}>
                    <div className="nav-primary">
                      <span className="nav-primary-icon">{group.icon}</span>
                      <span>{group.label}</span>
                    </div>
                    <div className="nav-children">
                      {group.children.map((child) => (
                        <button
                          key={child.key}
                          type="button"
                          className={`nav-child${selectedKey === child.key ? ' is-selected' : ''}`}
                          onClick={() => router.push(child.key)}
                        >
                          <span className="nav-child-icon">{child.icon}</span>
                          <span className="nav-item-label">{child.label}</span>
                          {reviewBadge(child.key)}
                        </button>
                      ))}
                    </div>
                  </section>
                );
              })}
        </nav>
      </Sider>
      <Layout>
        <Header
          style={{
            background: '#fff',
            padding: '0 24px',
            display: 'flex',
            justifyContent: 'flex-end',
            alignItems: 'center',
          }}
        >
          <Dropdown
            menu={{
              items: [
                { key: 'logout', icon: <LogoutOutlined />, label: '退出登录', onClick: logout },
              ],
            }}
          >
            <span style={{ cursor: 'pointer' }}>
              <Avatar size="small" icon={<UserOutlined />} /> {admin.username}（{admin.role}）
            </span>
          </Dropdown>
        </Header>
        <Content style={{ margin: 24 }}>{children}</Content>
      </Layout>
      <style jsx global>{`
        .side-nav {
          display: flex;
          flex-direction: column;
          gap: 4px;
          padding: 0 10px 14px;
        }
        .nav-group {
          padding: 6px 0 8px;
        }
        .nav-group + .nav-group,
        .nav-group + .nav-direct,
        .nav-direct + .nav-direct {
          margin-top: 4px;
        }
        .nav-primary {
          display: flex;
          align-items: center;
          gap: 10px;
          min-height: 36px;
          padding: 0 12px;
          color: rgba(255, 255, 255, 0.88);
          font-size: 14px;
          font-weight: 600;
          letter-spacing: 0;
        }
        .nav-primary-icon,
        .nav-child-icon {
          display: inline-flex;
          align-items: center;
          justify-content: center;
          color: rgba(255, 255, 255, 0.72);
          font-size: 16px;
        }
        .nav-item-label {
          min-width: 0;
          flex: 1;
        }
        .nav-review-badge {
          display: inline-flex;
          align-items: center;
          justify-content: center;
          box-sizing: border-box;
          flex: 0 0 auto;
          min-width: 18px;
          height: 18px;
          padding: 0 5px;
          border-radius: 9px;
          background: #ff4d4f;
          color: #fff;
          font-size: 11px;
          font-weight: 600;
          line-height: 18px;
          white-space: nowrap;
          font-variant-numeric: tabular-nums;
          box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08);
        }
        .nav-direct,
        .nav-child,
        .nav-icon-button {
          border: 0;
          cursor: pointer;
          font: inherit;
          text-align: left;
        }
        .nav-direct {
          width: 100%;
          border-radius: 8px;
          background: transparent;
        }
        .nav-direct:hover,
        .nav-direct.is-selected {
          background: #1677ff;
          color: #fff;
        }
        .nav-direct:hover .nav-primary-icon,
        .nav-direct.is-selected .nav-primary-icon {
          color: #fff;
        }
        .nav-children {
          display: flex;
          flex-direction: column;
          gap: 2px;
          margin-left: 34px;
          margin-top: -2px;
          padding-right: 2px;
        }
        .nav-child {
          display: flex;
          align-items: center;
          gap: 8px;
          width: 100%;
          min-height: 34px;
          border-radius: 8px;
          background: transparent;
          color: rgba(255, 255, 255, 0.72);
          font-size: 13px;
          padding: 0 10px;
        }
        .nav-child:hover {
          background: rgba(255, 255, 255, 0.08);
          color: #fff;
        }
        .nav-child.is-selected {
          background: #1677ff;
          color: #fff;
          font-weight: 600;
        }
        .nav-child.is-selected .nav-child-icon {
          color: #fff;
        }
        .nav-group.is-active .nav-primary {
          color: #fff;
        }
        .side-nav-collapsed {
          align-items: center;
          gap: 6px;
          padding: 0 8px 14px;
        }
        .nav-icon-button {
          position: relative;
          display: inline-flex;
          align-items: center;
          justify-content: center;
          width: 40px;
          height: 40px;
          border-radius: 8px;
          background: transparent;
          color: rgba(255, 255, 255, 0.72);
          font-size: 17px;
        }
        .nav-icon-button .nav-review-badge {
          position: absolute;
          top: 1px;
          right: -6px;
        }
        .nav-icon-button:hover,
        .nav-icon-button.is-selected {
          background: #1677ff;
          color: #fff;
        }
      `}</style>
    </Layout>
  );
}