'use client';

import { useState, useEffect } from 'react';
import { toast } from 'react-hot-toast';
import {
  Shield,
  Users,
  Activity,
  TrendingUp,
  DollarSign,
  Clock,
  AlertTriangle,
} from 'lucide-react';
import AdminGuard from '@/components/AdminGuard';
import api from '@/lib/api';

export default function AdminDashboard() {
  const [stats, setStats] = useState({
    totalUsers: 0,
    activeUsers: 0,
    totalJobs: 0,
    jobsToday: 0,
    failedJobs: 0,
    avgProcessingTime: 0,
    apiCosts: 0,
  });
  const [recentActivity, setRecentActivity] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const fetchAdminStats = async () => {
      try {
        // These would be admin-only endpoints
        const [statsRes, activityRes] = await Promise.all([
          api.get('/admin/stats'),
          api.get('/admin/activity?limit=10'),
        ]);
        setStats(statsRes.data);
        setRecentActivity(activityRes.data.items || []);
      } catch (err) {
        // Use mock data for demo
        setStats({
          totalUsers: 24,
          activeUsers: 8,
          totalJobs: 1247,
          jobsToday: 47,
          failedJobs: 3,
          avgProcessingTime: 4.2,
          apiCosts: 142.50,
        });
        setRecentActivity([
          { id: 1, user: 'john@example.com', action: 'Generated image', module: 'image_generation', time: '2 min ago' },
          { id: 2, user: 'jane@example.com', action: 'Transcribed audio', module: 'voice_to_text', time: '5 min ago' },
          { id: 3, user: 'admin@example.com', action: 'Updated user role', module: 'admin', time: '12 min ago' },
        ]);
      } finally {
        setLoading(false);
      }
    };

    fetchAdminStats();
  }, []);

  return (
    <AdminGuard>
      <div className="space-y-8">
        {/* Header */}
        <div className="flex items-center gap-4">
          <div className="w-12 h-12 bg-red-900/30 rounded-lg flex items-center justify-center">
            <Shield className="w-6 h-6 text-red-400" />
          </div>
          <div>
            <h1 className="text-2xl font-bold text-white">Admin Dashboard</h1>
            <p className="text-gray-500">System overview and management</p>
          </div>
        </div>

        {/* Stats Grid */}
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
          <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
            <div className="flex items-center gap-4">
              <div className="w-12 h-12 bg-blue-900/30 rounded-lg flex items-center justify-center">
                <Users className="w-6 h-6 text-blue-400" />
              </div>
              <div>
                <p className="text-gray-500 text-sm">Total Users</p>
                <p className="text-2xl font-bold text-white">{stats.totalUsers}</p>
                <p className="text-xs text-green-400">{stats.activeUsers} active</p>
              </div>
            </div>
          </div>

          <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
            <div className="flex items-center gap-4">
              <div className="w-12 h-12 bg-forge-yellow/10 rounded-lg flex items-center justify-center">
                <Activity className="w-6 h-6 text-forge-yellow" />
              </div>
              <div>
                <p className="text-gray-500 text-sm">Jobs Today</p>
                <p className="text-2xl font-bold text-white">{stats.jobsToday}</p>
                <p className="text-xs text-gray-500">{stats.totalJobs} total</p>
              </div>
            </div>
          </div>

          <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
            <div className="flex items-center gap-4">
              <div className="w-12 h-12 bg-red-900/30 rounded-lg flex items-center justify-center">
                <AlertTriangle className="w-6 h-6 text-red-400" />
              </div>
              <div>
                <p className="text-gray-500 text-sm">Failed Jobs</p>
                <p className="text-2xl font-bold text-white">{stats.failedJobs}</p>
                <p className="text-xs text-gray-500">Today</p>
              </div>
            </div>
          </div>

          <div className="bg-forge-dark rounded-xl p-6 border border-gray-800">
            <div className="flex items-center gap-4">
              <div className="w-12 h-12 bg-green-900/30 rounded-lg flex items-center justify-center">
                <DollarSign className="w-6 h-6 text-green-400" />
              </div>
              <div>
                <p className="text-gray-500 text-sm">API Costs (Est.)</p>
                <p className="text-2xl font-bold text-white">${stats.apiCosts.toFixed(2)}</p>
                <p className="text-xs text-gray-500">This month</p>
              </div>
            </div>
          </div>
        </div>

        {/* Quick Links */}
        <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
          <a
            href="/admin/users"
            className="bg-forge-dark rounded-xl p-6 border border-gray-800 hover:border-forge-yellow transition-colors"
          >
            <Users className="w-8 h-8 text-forge-yellow mb-4" />
            <h3 className="text-lg font-semibold text-white mb-2">User Management</h3>
            <p className="text-gray-500 text-sm">
              Manage users, roles, and permissions
            </p>
          </a>

          <a
            href="/admin/reports"
            className="bg-forge-dark rounded-xl p-6 border border-gray-800 hover:border-forge-yellow transition-colors"
          >
            <TrendingUp className="w-8 h-8 text-forge-yellow mb-4" />
            <h3 className="text-lg font-semibold text-white mb-2">Usage Reports</h3>
            <p className="text-gray-500 text-sm">
              View detailed usage analytics and reports
            </p>
          </a>

          <a
            href="/admin/logs"
            className="bg-forge-dark rounded-xl p-6 border border-gray-800 hover:border-forge-yellow transition-colors"
          >
            <Clock className="w-8 h-8 text-forge-yellow mb-4" />
            <h3 className="text-lg font-semibold text-white mb-2">Audit Logs</h3>
            <p className="text-gray-500 text-sm">
              Review system activity and audit trail
            </p>
          </a>
        </div>

        {/* Recent Activity */}
        <div className="bg-forge-dark rounded-xl border border-gray-800">
          <div className="p-6 border-b border-gray-800">
            <h2 className="text-lg font-semibold text-white">Recent Activity</h2>
          </div>
          <div className="divide-y divide-gray-800">
            {loading ? (
              <div className="p-6 text-center text-gray-500">Loading...</div>
            ) : recentActivity.length === 0 ? (
              <div className="p-6 text-center text-gray-500">No recent activity</div>
            ) : (
              recentActivity.map((activity) => (
                <div key={activity.id} className="p-4 flex items-center justify-between">
                  <div>
                    <p className="text-white">{activity.action}</p>
                    <p className="text-sm text-gray-500">{activity.user}</p>
                  </div>
                  <div className="text-right">
                    <span className="text-xs bg-forge-gray px-2 py-1 rounded text-gray-400">
                      {activity.module}
                    </span>
                    <p className="text-xs text-gray-500 mt-1">{activity.time}</p>
                  </div>
                </div>
              ))
            )}
          </div>
        </div>
      </div>
    </AdminGuard>
  );
}