"use client";

import { useState } from 'react';
import { 
  Users, 
  ShoppingCart, 
  TrendingUp, 
  AlertTriangle, 
  CheckCircle, 
  Clock,
  BarChart3,
  Activity,
  Calendar,
  Settings
} from 'lucide-react';

export default function AdminDashboard() {
  const [selectedPeriod, setSelectedPeriod] = useState('7d');

  // Sample data - in a real app, this would come from your database
  const stats = {
    totalUsers: 1247,
    activeUsers: 892,
    totalProducts: 15420,
    totalBuilds: 3421,
    revenue: 45678,
    growth: 12.5,
    pendingApprovals: 23,
    systemAlerts: 2
  };

  const recentActivity = [
    { id: 1, user: 'John Doe', action: 'Created new build', time: '2 minutes ago', type: 'build' },
    { id: 2, user: 'Jane Smith', action: 'Updated profile', time: '5 minutes ago', type: 'profile' },
    { id: 3, user: 'Mike Johnson', action: 'Added product to cart', time: '8 minutes ago', type: 'cart' },
    { id: 4, user: 'Sarah Wilson', action: 'Completed purchase', time: '12 minutes ago', type: 'purchase' },
    { id: 5, user: 'Admin User', action: 'Updated category mapping', time: '15 minutes ago', type: 'admin' }
  ];

  const topProducts = [
    { name: 'AR-15 Lower Receiver', sales: 156, revenue: 12480 },
    { name: 'Tactical Scope', sales: 89, revenue: 17800 },
    { name: 'Gun Case', sales: 234, revenue: 11700 },
    { name: 'Ammo Storage', sales: 67, revenue: 3350 },
    { name: 'Cleaning Kit', sales: 189, revenue: 5670 }
  ];

  const systemStatus = [
    { service: 'Database', status: 'healthy', uptime: '99.9%' },
    { service: 'API', status: 'healthy', uptime: '99.8%' },
    { service: 'File Storage', status: 'warning', uptime: '98.5%' },
    { service: 'Email Service', status: 'healthy', uptime: '99.7%' }
  ];

  return (
    <div className="p-8">
      {/* Header */}
      <div className="flex justify-between items-center mb-8">
        <div>
          <h1 className="text-3xl font-bold text-gray-900">Admin Dashboard</h1>
          <p className="text-gray-600 mt-1">Welcome back! Here's what's happening with your platform.</p>
        </div>
        <div className="flex items-center space-x-4">
          <select 
            value={selectedPeriod} 
            onChange={(e) => setSelectedPeriod(e.target.value)}
            className="border border-gray-300 rounded-md px-3 py-2 text-sm"
          >
            <option value="24h">Last 24 hours</option>
            <option value="7d">Last 7 days</option>
            <option value="30d">Last 30 days</option>
            <option value="90d">Last 90 days</option>
          </select>
          <button className="bg-blue-600 text-white px-4 py-2 rounded-md hover:bg-blue-700 transition-colors">
            <Settings className="w-4 h-4 inline mr-2" />
            Settings
          </button>
        </div>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6 mb-8">
        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-2 bg-blue-100 rounded-lg">
              <Users className="w-6 h-6 text-blue-600" />
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Total Users</p>
              <p className="text-2xl font-bold text-gray-900">{stats.totalUsers.toLocaleString()}</p>
            </div>
          </div>
          <div className="mt-4 flex items-center text-sm">
            <TrendingUp className="w-4 h-4 text-green-500 mr-1" />
            <span className="text-green-600">+{stats.growth}%</span>
            <span className="text-gray-500 ml-1">from last month</span>
          </div>
        </div>

        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-2 bg-green-100 rounded-lg">
              <ShoppingCart className="w-6 h-6 text-green-600" />
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Total Products</p>
              <p className="text-2xl font-bold text-gray-900">{stats.totalProducts.toLocaleString()}</p>
            </div>
          </div>
          <div className="mt-4 flex items-center text-sm">
            <CheckCircle className="w-4 h-4 text-green-500 mr-1" />
            <span className="text-green-600">Active</span>
            <span className="text-gray-500 ml-1">in catalog</span>
          </div>
        </div>

        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-2 bg-purple-100 rounded-lg">
              <BarChart3 className="w-6 h-6 text-purple-600" />
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Total Builds</p>
              <p className="text-2xl font-bold text-gray-900">{stats.totalBuilds.toLocaleString()}</p>
            </div>
          </div>
          <div className="mt-4 flex items-center text-sm">
            <Activity className="w-4 h-4 text-blue-500 mr-1" />
            <span className="text-blue-600">{stats.activeUsers}</span>
            <span className="text-gray-500 ml-1">active users</span>
          </div>
        </div>

        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-2 bg-orange-100 rounded-lg">
              <TrendingUp className="w-6 h-6 text-orange-600" />
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Revenue</p>
              <p className="text-2xl font-bold text-gray-900">${stats.revenue.toLocaleString()}</p>
            </div>
          </div>
          <div className="mt-4 flex items-center text-sm">
            <TrendingUp className="w-4 h-4 text-green-500 mr-1" />
            <span className="text-green-600">+8.2%</span>
            <span className="text-gray-500 ml-1">from last month</span>
          </div>
        </div>
      </div>

      {/* Alerts and Notifications */}
      <div className="grid grid-cols-1 lg:grid-cols-3 gap-6 mb-8">
        <div className="lg:col-span-2">
          <div className="bg-white rounded-lg shadow">
            <div className="p-6 border-b border-gray-200">
              <h3 className="text-lg font-medium text-gray-900">Recent Activity</h3>
            </div>
            <div className="p-6">
              <div className="space-y-4">
                {recentActivity.map((activity) => (
                  <div key={activity.id} className="flex items-center space-x-3">
                    <div className={`w-2 h-2 rounded-full ${
                      activity.type === 'build' ? 'bg-blue-500' :
                      activity.type === 'profile' ? 'bg-green-500' :
                      activity.type === 'cart' ? 'bg-orange-500' :
                      activity.type === 'purchase' ? 'bg-purple-500' :
                      'bg-gray-500'
                    }`} />
                    <div className="flex-1">
                      <p className="text-sm font-medium text-gray-900">{activity.user}</p>
                      <p className="text-sm text-gray-500">{activity.action}</p>
                    </div>
                    <div className="text-sm text-gray-400">{activity.time}</div>
                  </div>
                ))}
              </div>
            </div>
          </div>
        </div>

        <div className="space-y-6">
          {/* Pending Actions */}
          <div className="bg-white rounded-lg shadow">
            <div className="p-6 border-b border-gray-200">
              <h3 className="text-lg font-medium text-gray-900">Pending Actions</h3>
            </div>
            <div className="p-6">
              <div className="space-y-4">
                <div className="flex items-center justify-between">
                  <div className="flex items-center">
                    <AlertTriangle className="w-5 h-5 text-yellow-500 mr-3" />
                    <span className="text-sm font-medium">Approvals Needed</span>
                  </div>
                  <span className="bg-yellow-100 text-yellow-800 text-xs font-medium px-2 py-1 rounded-full">
                    {stats.pendingApprovals}
                  </span>
                </div>
                <div className="flex items-center justify-between">
                  <div className="flex items-center">
                    <AlertTriangle className="w-5 h-5 text-red-500 mr-3" />
                    <span className="text-sm font-medium">System Alerts</span>
                  </div>
                  <span className="bg-red-100 text-red-800 text-xs font-medium px-2 py-1 rounded-full">
                    {stats.systemAlerts}
                  </span>
                </div>
              </div>
            </div>
          </div>

          {/* System Status */}
          <div className="bg-white rounded-lg shadow">
            <div className="p-6 border-b border-gray-200">
              <h3 className="text-lg font-medium text-gray-900">System Status</h3>
            </div>
            <div className="p-6">
              <div className="space-y-3">
                {systemStatus.map((service, index) => (
                  <div key={index} className="flex items-center justify-between">
                    <span className="text-sm font-medium text-gray-900">{service.service}</span>
                    <div className="flex items-center space-x-2">
                      <div className={`w-2 h-2 rounded-full ${
                        service.status === 'healthy' ? 'bg-green-500' : 'bg-yellow-500'
                      }`} />
                      <span className="text-xs text-gray-500">{service.uptime}</span>
                    </div>
                  </div>
                ))}
              </div>
            </div>
          </div>
        </div>
      </div>

      {/* Top Products */}
      <div className="bg-white rounded-lg shadow">
        <div className="p-6 border-b border-gray-200">
          <h3 className="text-lg font-medium text-gray-900">Top Products</h3>
        </div>
        <div className="p-6">
          <div className="overflow-x-auto">
            <table className="min-w-full divide-y divide-gray-200">
              <thead>
                <tr>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    Product
                  </th>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    Sales
                  </th>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    Revenue
                  </th>
                </tr>
              </thead>
              <tbody className="bg-white divide-y divide-gray-200">
                {topProducts.map((product, index) => (
                  <tr key={index}>
                    <td className="px-6 py-4 whitespace-nowrap text-sm font-medium text-gray-900">
                      {product.name}
                    </td>
                    <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
                      {product.sales}
                    </td>
                    <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
                      ${product.revenue.toLocaleString()}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </div>
  );
}