import { useState, useEffect } from 'react';
import { Outlet, useLocation, useNavigate } from 'react-router-dom';
import {
  LayoutDashboard, Database, Server, Zap, Leaf,
  ClipboardList, Search, UserCog, Users, Lock, Shield, GitBranch, Bell,
  LogOut, Settings, Clock, Megaphone, Sun, Moon, BookOpen
} from 'lucide-react';
import { menuSections } from '@/constants/menu';
import { useAuth } from '@/hooks/useAuth';
import { useTheme } from '@/hooks/useTheme';

const iconMap: Record<string, React.ElementType> = {
  LayoutDashboard, Database, Server, Zap, Leaf,
  ClipboardList, Search, UserCog, Users, Lock, Shield, GitBranch, Bell,
  Settings, Clock, Megaphone, BookOpen,
};

export default function Layout() {
  const { user, logout, visibleMenuItems } = useAuth();
  const { theme, toggleTheme } = useTheme();
  const location = useLocation();
  const navigate = useNavigate();
  const currentPath = location.pathname.split('/')[1] || 'dashboard';
  const [pendingCount, setPendingCount] = useState(0);

  useEffect(() => {
    import('@/api/request').then(m => m.default.get('/dashboard/stats'))
      .then((data: any) => setPendingCount(data?.ticket_pending ?? 0))
      .catch(() => {});
  }, [location.pathname]);

  const getPageTitle = () => {
    const item = visibleMenuItems.find(m => m.id === currentPath);
    return item?.label || '仪表盘';
  };

  return (
    <div className="flex h-screen bg-[var(--dg-bg-primary)] text-[var(--dg-text-primary)] overflow-hidden">
      {/* 侧边栏 */}
      <aside className="flex flex-col bg-[var(--dg-bg-secondary)] border-r border-[var(--dg-border)] w-[220px] min-w-[220px]">
        {/* Logo */}
        <div className="h-14 flex items-center px-4">
          <div className="flex items-center gap-2.5">
            <div className="w-7 h-7 rounded-lg dg-gradient-br flex items-center justify-center flex-shrink-0">
              <Shield className="w-4 h-4 text-white" />
            </div>
            <span className="text-base font-bold dg-gradient-text whitespace-nowrap">
              SQL-Platform
            </span>
          </div>
        </div>

        {/* 菜单 */}
        <nav className="flex-1 overflow-y-auto scrollbar-thin py-1">
          {menuSections.map(section => {
            const items = visibleMenuItems.filter(item => item.section === section.id);
            if (items.length === 0) return null;
            return (
              <div key={section.id} className="mb-1">
                <div className="px-4 py-1.5 text-[10px] font-semibold uppercase tracking-wider text-[var(--dg-text-muted)]">
                  {section.label}
                </div>
                {items.map(item => {
                  const Icon = iconMap[item.icon] || Database;
                  const isActive = currentPath === item.id;
                  return (
                    <div
                      key={item.id}
                      onClick={() => navigate('/' + item.id)}
                      className={
                        'flex items-center mx-2 px-3 py-2 rounded-lg cursor-pointer transition-all duration-150 relative text-[13px] '
                        + (isActive
                          ? 'bg-blue-500/10 text-blue-400 font-medium'
                          : 'text-[var(--dg-text-secondary)] hover:bg-[var(--dg-bg-hover)] hover:text-[var(--dg-text-primary)]')
                      }
                    >
                      {isActive && (
                        <div className="absolute left-0 top-1/2 -translate-y-1/2 w-[3px] h-4 bg-blue-400 rounded-r" />
                      )}
                      <Icon className="w-4 h-4 flex-shrink-0" />
                      <span className="ml-2.5">{item.label}</span>
                    </div>
                  );
                })}
              </div>
            );
          })}
        </nav>
      </aside>

      {/* 主内容区 */}
      <main className="flex-1 flex flex-col min-w-0 overflow-hidden">
        {/* 顶部栏 */}
        <header className="h-14 bg-[var(--dg-bg-secondary)] border-b border-[var(--dg-border)] flex items-center justify-between px-5 flex-shrink-0">
          <div className="flex items-center gap-2 text-sm">
            <span className="text-[var(--dg-text-muted)]">{getPageTitle()}</span>
          </div>
          <div className="flex items-center gap-2">
            <button
              onClick={toggleTheme}
              className="w-8 h-8 rounded-lg flex items-center justify-center text-[var(--dg-text-muted)] hover:bg-[var(--dg-bg-hover)] transition-colors"
              title={theme === 'dark' ? '浅色模式' : '深色模式'}
            >
              {theme === 'dark' ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
            </button>
            <button onClick={() => navigate('/tickets')}
              className="w-8 h-8 rounded-lg flex items-center justify-center text-[var(--dg-text-muted)] hover:bg-[var(--dg-bg-hover)] transition-colors relative">
              <Bell className="w-4 h-4" />
              {pendingCount > 0 && (
                <span className="absolute -top-0.5 -right-0.5 min-w-[16px] h-4 px-1 bg-red-500 rounded-full text-[10px] text-white font-bold flex items-center justify-center">
                  {pendingCount > 99 ? '99+' : pendingCount}
                </span>
              )}
            </button>
            <div className="w-px h-5 bg-[var(--dg-border)] mx-1" />
            <div className="flex items-center gap-2 pl-1">
              <div className="w-7 h-7 rounded-full dg-gradient-br flex items-center justify-center text-white text-xs font-semibold flex-shrink-0">
                {user.avatar}
              </div>
              <span className="text-sm text-[var(--dg-text-secondary)] max-w-[80px] truncate">{user.username}</span>
              <button
                onClick={() => { logout(); navigate('/login'); }}
                className="w-8 h-8 rounded-lg flex items-center justify-center text-[var(--dg-text-muted)] hover:bg-red-500/10 hover:text-red-400 transition-colors"
                title="退出登录"
              >
                <LogOut className="w-4 h-4" />
              </button>
            </div>
          </div>
        </header>

        {/* 页面内容 */}
        <div className="flex-1 overflow-y-auto scrollbar-thin p-5">
          <Outlet />
        </div>
      </main>
    </div>
  );
}