import { useState, useEffect } from 'react';
import { useRouter } from 'next/router';
import Head from 'next/head';
import DashboardLayout from '../../components/Layout/DashboardLayout';
import {
  UserGroupIcon,
  PhoneIcon,
  DocumentTextIcon,
  ChartBarIcon,
  InboxIcon,
  VideoCameraIcon,
  LanguageIcon,
  CurrencyDollarIcon,
} from '@heroicons/react/24/outline';
import {
  CheckCircleIcon as CheckCircleIconSolid,
  ExclamationTriangleIcon as ExclamationTriangleIconSolid,
  ClockIcon as ClockIconSolid,
  XCircleIcon as XCircleIconSolid,
  UserGroupIcon as UserGroupIconSolid,
  PhoneIcon as PhoneIconSolid,
  DocumentTextIcon as DocumentTextIconSolid,
  CurrencyDollarIcon as CurrencyDollarIconSolid,
  UsersIcon as UsersIconSolid,
} from '@heroicons/react/24/solid';
import { toast } from 'react-hot-toast';
import { statsAPI } from '../../lib/api-service';

interface DashboardStats {
  totalUsers: number;
  totalInterpreters: number;
  totalOrders: number;
  totalCalls: number;
  activeUsers: number;
  activeCalls: number;
  recentOrders: any[];
  recentCalls: any[];
}

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

export default function Dashboard() {
  const router = useRouter();
  const [stats, setStats] = useState<DashboardStats>({
    totalUsers: 0,
    totalInterpreters: 0,
    totalOrders: 0,
    totalCalls: 0,
    activeUsers: 0,
    activeCalls: 0,
    recentOrders: [],
    recentCalls: []
  });
  const [loading, setLoading] = useState(true);
  const [recentActivity, setRecentActivity] = useState<RecentActivity[]>([]);

  useEffect(() => {
    loadDashboardData();
  }, []);

  const loadDashboardData = async () => {
    try {
      setLoading(true);
      const dashboardStats = await statsAPI.getDashboardStats();
      setStats(dashboardStats);
      
      // 生成最近活动记录
      const activities: RecentActivity[] = [];
      
      // 添加最近订单活动
      dashboardStats.recentOrders.forEach((order: any) => {
        activities.push({
          id: order.id,
          type: 'order',
          title: `订单 ${order.order_number || order.id}`,
          description: `${order.user_name || '用户'} - ${order.service_name || '服务'}`,
          time: formatTime(order.created_at),
          status: getOrderStatus(order.status),
          icon: getOrderIcon(order.service_type)
        });
      });
      
      // 添加最近通话活动
      dashboardStats.recentCalls.forEach((call: any) => {
        activities.push({
          id: call.id,
          type: 'call',
          title: `${call.service_type === 'phone' ? '电话' : '视频'}通话`,
          description: `${call.users?.name || '用户'} - ${call.interpreters?.name || '翻译员'}`,
          time: formatTime(call.created_at),
          status: getCallStatus(call.status),
          icon: call.service_type === 'phone' ? PhoneIcon : VideoCameraIcon
        });
      });
      
      // 按时间排序
      activities.sort((a, b) => new Date(b.time).getTime() - new Date(a.time).getTime());
      setRecentActivity(activities.slice(0, 10));
      
    } catch (error) {
      console.error('加载仪表盘数据失败:', error);
      toast.error('加载仪表盘数据失败');
    } finally {
      setLoading(false);
    }
  };

  const getOrderStatus = (status: string) => {
    switch (status) {
      case 'completed': return 'success';
      case 'cancelled': return 'error';
      case 'in_progress': return 'warning';
      default: return 'info';
    }
  };

  const getCallStatus = (status: string) => {
    switch (status) {
      case 'ended': return 'success';
      case 'cancelled': return 'error';
      case 'connected': return 'warning';
      default: return 'info';
    }
  };

  const getOrderIcon = (serviceType: string) => {
    switch (serviceType) {
      case 'phone': return PhoneIcon;
      case 'video': return VideoCameraIcon;
      case 'document': return DocumentTextIcon;
      default: return LanguageIcon;
    }
  };

  const formatTime = (dateString: string) => {
    if (!dateString) return '未知时间';
    const date = new Date(dateString);
    const now = new Date();
    const diff = now.getTime() - date.getTime();
    const minutes = Math.floor(diff / 60000);
    const hours = Math.floor(minutes / 60);
    const days = Math.floor(hours / 24);

    if (days > 0) {
      return `${days}天前`;
    } else if (hours > 0) {
      return `${hours}小时前`;
    } else if (minutes > 0) {
      return `${minutes}分钟前`;
    } else {
      return '刚刚';
    }
  };

  const getStatusColor = (status: string) => {
    switch (status) {
      case 'success': return 'bg-green-100 text-green-800';
      case 'warning': return 'bg-yellow-100 text-yellow-800';
      case 'error': return 'bg-red-100 text-red-800';
      default: return 'bg-blue-100 text-blue-800';
    }
  };

  const getStatusIcon = (status: string) => {
    switch (status) {
      case 'success': return CheckCircleIconSolid;
      case 'warning': return ExclamationTriangleIconSolid;
      case 'error': return XCircleIconSolid;
      default: return ClockIconSolid;
    }
  };

  if (loading) {
    return (
      <>
        <Head>
          <title>仪表盘 - 翻译服务管理系统</title>
        </Head>
        
        <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-indigo-600"></div>
            <p className="ml-4 text-gray-600">加载中...</p>
          </div>
        </DashboardLayout>
      </>
    );
  }

  return (
    <>
      <Head>
        <title>仪表盘 - 翻译服务管理系统</title>
      </Head>
      
      <DashboardLayout title="仪表盘">
        <div className="space-y-6">
          {/* 页面标题和描述 */}
          <div>
            <h1 className="text-2xl font-bold text-gray-900">系统概览</h1>
            <p className="mt-2 text-sm text-gray-700">
              欢迎回来，管理员。这里是您的系统概览和数据统计。
            </p>
          </div>

          {/* Stats Cards */}
          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
            <div className="bg-white overflow-hidden shadow rounded-lg">
              <div className="p-5">
                <div className="flex items-center">
                  <div className="flex-shrink-0">
                    <UserGroupIconSolid className="h-8 w-8 text-blue-600" />
                  </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="text-lg font-medium text-gray-900">
                        {stats.totalUsers.toLocaleString()}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
              <div className="bg-gray-50 px-5 py-3">
                <div className="text-sm">
                  <span className="text-green-600 font-medium">
                    {stats.activeUsers} 活跃用户
                  </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">
                    <UsersIconSolid className="h-8 w-8 text-green-600" />
                  </div>
                  <div className="ml-5 w-0 flex-1">
                    <dl>
                      <dt className="text-sm font-medium text-gray-500 truncate">
                        翻译员总数
                      </dt>
                      <dd className="text-lg font-medium text-gray-900">
                        {stats.totalInterpreters.toLocaleString()}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
              <div className="bg-gray-50 px-5 py-3">
                <div className="text-sm">
                  <span className="text-green-600 font-medium">
                    在线翻译员
                  </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">
                    <DocumentTextIconSolid className="h-8 w-8 text-purple-600" />
                  </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="text-lg font-medium text-gray-900">
                        {stats.totalOrders.toLocaleString()}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
              <div className="bg-gray-50 px-5 py-3">
                <div className="text-sm">
                  <span className="text-green-600 font-medium">
                    本月新增
                  </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">
                    <PhoneIconSolid className="h-8 w-8 text-orange-600" />
                  </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="text-lg font-medium text-gray-900">
                        {stats.totalCalls.toLocaleString()}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
              <div className="bg-gray-50 px-5 py-3">
                <div className="text-sm">
                  <span className="text-orange-600 font-medium">
                    {stats.activeCalls} 进行中
                  </span>
                </div>
              </div>
            </div>
          </div>

          {/* Recent Activity */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-6 py-4 border-b border-gray-200">
              <h3 className="text-lg font-medium text-gray-900 flex items-center">
                <ChartBarIcon className="h-5 w-5 text-indigo-600 mr-2" />
                最近活动
              </h3>
            </div>
            <div className="divide-y divide-gray-200">
              {recentActivity.length === 0 ? (
                <div className="px-6 py-8 text-center">
                  <InboxIcon className="mx-auto h-12 w-12 text-gray-400" />
                  <p className="mt-2 text-sm text-gray-500">暂无活动记录</p>
                </div>
              ) : (
                recentActivity.map((activity) => {
                  const StatusIcon = getStatusIcon(activity.status);
                  const ActivityIcon = activity.icon;
                  
                  return (
                    <div key={activity.id} className="px-6 py-4 hover:bg-gray-50 transition-colors duration-200">
                      <div className="flex items-center">
                        <div className="flex-shrink-0">
                          <div className={`p-2 rounded-full ${getStatusColor(activity.status)}`}>
                            <ActivityIcon className="h-5 w-5" />
                          </div>
                        </div>
                        <div className="ml-4 flex-1">
                          <div className="flex items-center justify-between">
                            <p className="text-sm font-medium text-gray-900">
                              {activity.title}
                            </p>
                            <div className="flex items-center">
                              <StatusIcon className={`h-4 w-4 mr-1 ${
                                activity.status === 'success' ? 'text-green-500' :
                                activity.status === 'warning' ? 'text-yellow-500' :
                                activity.status === 'error' ? 'text-red-500' :
                                'text-blue-500'
                              }`} />
                              <span className="text-xs text-gray-500">
                                {activity.time}
                              </span>
                            </div>
                          </div>
                          <p className="text-sm text-gray-500 mt-1">
                            {activity.description}
                          </p>
                        </div>
                      </div>
                    </div>
                  );
                })
              )}
            </div>
          </div>
        </div>
      </DashboardLayout>
    </>
  );
}