import { useState, useEffect } from 'react';
import DashboardLayout from '../../components/Layout/DashboardLayout';
import { getDemoData } from '../../lib/demo-data';
import {
  UsersIcon,
  PhoneIcon,
  DocumentTextIcon,
  CurrencyDollarIcon,
  CheckCircleIcon,
  ClockIcon,
  ExclamationTriangleIcon,
  ArrowUpIcon,
  ArrowDownIcon,
  EyeIcon
} from '@heroicons/react/24/outline';

interface DashboardStats {
  totalUsers: number;
  activeUsers: number;
  totalCalls: number;
  activeCalls: number;
  totalOrders: number;
  pendingOrders: number;
  completedOrders: number;
  totalRevenue: number;
  monthlyRevenue: number;
  activeInterpreters: number;
}

interface RecentActivity {
  id: string;
  type: 'call' | 'order' | 'user' | 'system';
  title: string;
  description: string;
  time: string;
  status: 'success' | 'warning' | 'error' | 'info';
}

export default function Dashboard() {
  const [stats, setStats] = useState<DashboardStats | null>(null);
  const [activities, setActivities] = useState<RecentActivity[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const loadDashboardData = async () => {
      try {
        setLoading(true);
        
        // 模拟加载延迟
        await new Promise(resolve => setTimeout(resolve, 1000));
        
        // 使用演示数据
        const mockStats: DashboardStats = {
          totalUsers: 1248,
          activeUsers: 856,
          totalCalls: 3456,
          activeCalls: 12,
          totalOrders: 2789,
          pendingOrders: 45,
          completedOrders: 2654,
          totalRevenue: 125000,
          monthlyRevenue: 15600,
          activeInterpreters: 23
        };

        const mockActivities: RecentActivity[] = [
          {
            id: '1',
            type: 'call',
            title: '新通话开始',
            description: '张三开始了中英互译通话',
            time: '2分钟前',
            status: 'success'
          },
          {
            id: '2',
            type: 'order',
            title: '订单完成',
            description: '订单ORD-2024-001已完成，费用￥180',
            time: '5分钟前',
            status: 'success'
          },
          {
            id: '3',
            type: 'user',
            title: '新用户注册',
            description: 'ABC公司注册了企业账户',
            time: '10分钟前',
            status: 'info'
          },
          {
            id: '4',
            type: 'system',
            title: '系统维护',
            description: '系统将在今晚22:00-23:00进行维护',
            time: '30分钟前',
            status: 'warning'
          },
          {
            id: '5',
            type: 'call',
            title: '通话异常',
            description: '通话CALL-2024-003出现连接问题',
            time: '1小时前',
            status: 'error'
          }
        ];

        setStats(mockStats);
        setActivities(mockActivities);
      } catch (error) {
        console.error('Failed to load dashboard data:', error);
      } finally {
        setLoading(false);
      }
    };

    loadDashboardData();
  }, []);

  const getStatusColor = (status: string) => {
    switch (status) {
      case 'success':
        return 'text-green-600 bg-green-100';
      case 'warning':
        return 'text-yellow-600 bg-yellow-100';
      case 'error':
        return 'text-red-600 bg-red-100';
      default:
        return 'text-blue-600 bg-blue-100';
    }
  };

  const getStatusIcon = (status: string) => {
    switch (status) {
      case 'success':
        return <CheckCircleIcon className="h-5 w-5 text-green-500" />;
      case 'warning':
        return <ExclamationTriangleIcon className="h-5 w-5 text-yellow-500" />;
      case 'error':
        return <ExclamationTriangleIcon className="h-5 w-5 text-red-500" />;
      default:
        return <ClockIcon className="h-5 w-5 text-blue-500" />;
    }
  };

  if (loading) {
    return (
      <DashboardLayout title="仪表盘">
        <div className="flex items-center justify-center h-64">
          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600"></div>
        </div>
      </DashboardLayout>
    );
  }

  return (
    <DashboardLayout title="仪表盘">
      <div className="space-y-6">
        {/* 欢迎区域 */}
        <div className="bg-white shadow rounded-lg p-6">
          <h1 className="text-2xl font-bold text-gray-900">欢迎回来！</h1>
          <p className="mt-1 text-sm text-gray-600">
            这里是您的管理仪表板，查看最新的业务数据和活动。
          </p>
        </div>

        {/* 统计卡片 */}
        <div className="grid grid-cols-1 gap-5 sm:grid-cols-2 lg:grid-cols-4">
          <div className="bg-white overflow-hidden shadow rounded-lg">
            <div className="p-5">
              <div className="flex items-center">
                <div className="flex-shrink-0">
                  <UsersIcon className="h-6 w-6 text-blue-400" />
                </div>
                <div className="ml-5 w-0 flex-1">
                  <dl>
                    <dt className="text-sm font-medium text-gray-500 truncate">总用户数</dt>
                    <dd className="flex items-baseline">
                      <div className="text-2xl font-semibold text-gray-900">{stats?.totalUsers || 0}</div>
                      <div className="ml-2 flex items-baseline text-sm font-semibold text-green-600">
                        <ArrowUpIcon className="self-center flex-shrink-0 h-4 w-4 text-green-500" />
                        <span className="sr-only">增加了</span>
                        12%
                      </div>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
            <div className="bg-gray-50 px-5 py-3">
              <div className="text-sm">
                <span className="font-medium text-gray-500">活跃用户: </span>
                <span className="text-gray-900">{stats?.activeUsers || 0}</span>
              </div>
            </div>
          </div>

          <div className="bg-white overflow-hidden shadow rounded-lg">
            <div className="p-5">
              <div className="flex items-center">
                <div className="flex-shrink-0">
                  <PhoneIcon className="h-6 w-6 text-green-400" />
                </div>
                <div className="ml-5 w-0 flex-1">
                  <dl>
                    <dt className="text-sm font-medium text-gray-500 truncate">总通话数</dt>
                    <dd className="flex items-baseline">
                      <div className="text-2xl font-semibold text-gray-900">{stats?.totalCalls || 0}</div>
                      <div className="ml-2 flex items-baseline text-sm font-semibold text-green-600">
                        <ArrowUpIcon className="self-center flex-shrink-0 h-4 w-4 text-green-500" />
                        <span className="sr-only">增加了</span>
                        8%
                      </div>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
            <div className="bg-gray-50 px-5 py-3">
              <div className="text-sm">
                <span className="font-medium text-gray-500">进行中: </span>
                <span className="text-gray-900">{stats?.activeCalls || 0}</span>
              </div>
            </div>
          </div>

          <div className="bg-white overflow-hidden shadow rounded-lg">
            <div className="p-5">
              <div className="flex items-center">
                <div className="flex-shrink-0">
                  <DocumentTextIcon className="h-6 w-6 text-yellow-400" />
                </div>
                <div className="ml-5 w-0 flex-1">
                  <dl>
                    <dt className="text-sm font-medium text-gray-500 truncate">总订单数</dt>
                    <dd className="flex items-baseline">
                      <div className="text-2xl font-semibold text-gray-900">{stats?.totalOrders || 0}</div>
                      <div className="ml-2 flex items-baseline text-sm font-semibold text-green-600">
                        <ArrowUpIcon className="self-center flex-shrink-0 h-4 w-4 text-green-500" />
                        <span className="sr-only">增加了</span>
                        15%
                      </div>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
            <div className="bg-gray-50 px-5 py-3">
              <div className="text-sm">
                <span className="font-medium text-gray-500">待处理: </span>
                <span className="text-gray-900">{stats?.pendingOrders || 0}</span>
              </div>
            </div>
          </div>

          <div className="bg-white overflow-hidden shadow rounded-lg">
            <div className="p-5">
              <div className="flex items-center">
                <div className="flex-shrink-0">
                  <CurrencyDollarIcon className="h-6 w-6 text-purple-400" />
                </div>
                <div className="ml-5 w-0 flex-1">
                  <dl>
                    <dt className="text-sm font-medium text-gray-500 truncate">总收入</dt>
                    <dd className="flex items-baseline">
                      <div className="text-2xl font-semibold text-gray-900">¥{stats?.totalRevenue?.toLocaleString() || 0}</div>
                      <div className="ml-2 flex items-baseline text-sm font-semibold text-green-600">
                        <ArrowUpIcon className="self-center flex-shrink-0 h-4 w-4 text-green-500" />
                        <span className="sr-only">增加了</span>
                        22%
                      </div>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
            <div className="bg-gray-50 px-5 py-3">
              <div className="text-sm">
                <span className="font-medium text-gray-500">本月: </span>
                <span className="text-gray-900">¥{stats?.monthlyRevenue?.toLocaleString() || 0}</span>
              </div>
            </div>
          </div>
        </div>

        {/* 最近活动和快速操作 */}
        <div className="grid grid-cols-1 gap-6 lg:grid-cols-2">
          {/* 最近活动 */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-5 sm:p-6">
              <h3 className="text-lg leading-6 font-medium text-gray-900 mb-4">最近活动</h3>
              <div className="space-y-4">
                {activities.map((activity) => (
                  <div key={activity.id} className="flex items-start space-x-3">
                    <div className="flex-shrink-0">
                      {getStatusIcon(activity.status)}
                    </div>
                    <div className="min-w-0 flex-1">
                      <div className="text-sm font-medium text-gray-900">{activity.title}</div>
                      <div className="text-sm text-gray-500">{activity.description}</div>
                      <div className="text-xs text-gray-400 mt-1">{activity.time}</div>
                    </div>
                    <div className={`inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium ${getStatusColor(activity.status)}`}>
                      {activity.status === 'success' && '成功'}
                      {activity.status === 'warning' && '警告'}
                      {activity.status === 'error' && '错误'}
                      {activity.status === 'info' && '信息'}
                    </div>
                  </div>
                ))}
              </div>
              <div className="mt-6">
                <button className="w-full bg-gray-50 border border-gray-300 rounded-md py-2 px-4 inline-flex justify-center items-center text-sm font-medium text-gray-700 hover:bg-gray-100">
                  <EyeIcon className="h-4 w-4 mr-2" />
                  查看所有活动
                </button>
              </div>
            </div>
          </div>

          {/* 快速操作 */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-5 sm:p-6">
              <h3 className="text-lg leading-6 font-medium text-gray-900 mb-4">快速操作</h3>
              <div className="grid grid-cols-2 gap-4">
                <button className="bg-blue-50 border border-blue-200 rounded-lg p-4 text-left hover:bg-blue-100 transition-colors">
                  <div className="flex items-center">
                    <UsersIcon className="h-8 w-8 text-blue-600" />
                    <div className="ml-3">
                      <div className="text-sm font-medium text-blue-900">用户管理</div>
                      <div className="text-xs text-blue-700">管理用户账户</div>
                    </div>
                  </div>
                </button>
                
                <button className="bg-green-50 border border-green-200 rounded-lg p-4 text-left hover:bg-green-100 transition-colors">
                  <div className="flex items-center">
                    <PhoneIcon className="h-8 w-8 text-green-600" />
                    <div className="ml-3">
                      <div className="text-sm font-medium text-green-900">通话监控</div>
                      <div className="text-xs text-green-700">实时通话状态</div>
                    </div>
                  </div>
                </button>
                
                <button className="bg-yellow-50 border border-yellow-200 rounded-lg p-4 text-left hover:bg-yellow-100 transition-colors">
                  <div className="flex items-center">
                    <DocumentTextIcon className="h-8 w-8 text-yellow-600" />
                    <div className="ml-3">
                      <div className="text-sm font-medium text-yellow-900">订单管理</div>
                      <div className="text-xs text-yellow-700">处理订单请求</div>
                    </div>
                  </div>
                </button>
                
                <button className="bg-purple-50 border border-purple-200 rounded-lg p-4 text-left hover:bg-purple-100 transition-colors">
                  <div className="flex items-center">
                    <CurrencyDollarIcon className="h-8 w-8 text-purple-600" />
                    <div className="ml-3">
                      <div className="text-sm font-medium text-purple-900">财务报表</div>
                      <div className="text-xs text-purple-700">查看收入统计</div>
                    </div>
                  </div>
                </button>
              </div>
            </div>
          </div>
        </div>
      </div>
    </DashboardLayout>
  );
}