'use client';

import { useEffect, useState } from 'react';
import { usersService, User, uploadService } from '@/services';
import Link from 'next/link';

export default function DashboardPage() {
  const [stats, setStats] = useState({
    totalUsers: 0,
    activeUsers: 0,
    agents: 0,
    pendingUsers: 0,
  });
  const [isLoading, setIsLoading] = useState(true);
  const [recentUsers, setRecentUsers] = useState<User[]>([]);
  const [avatarUrls, setAvatarUrls] = useState<Record<string, string>>({});

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

  const fetchDashboardData = async () => {
    setIsLoading(true);
    try {
      const response = await usersService.getUsers({ page: 1, limit: 100 });
      const users = response.users || [];
      setStats({
        totalUsers: response.total || 0,
        activeUsers: users.filter((u) => u.status === 'ACTIVE').length,
        agents: users.filter((u) => u.role === 'AGENT').length,
        pendingUsers: users.filter((u) => u.status === 'PENDING_VERIFICATION').length,
      });
      const recent = users.slice(0, 5);
      setRecentUsers(recent);

      // Fetch presigned URLs for avatars
      const urls: Record<string, string> = {};
      await Promise.all(
        recent.map(async (user) => {
          if (user.profile?.avatar && uploadService.isS3Key(user.profile.avatar)) {
            try {
              urls[user.id] = await uploadService.getPresignedDownloadUrl(user.profile.avatar);
            } catch {
              // Ignore errors for individual avatar fetches
            }
          }
        })
      );
      setAvatarUrls(urls);
    } catch (err) {
      console.error('Failed to fetch dashboard data:', err);
    } finally {
      setIsLoading(false);
    }
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center py-12">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600"></div>
      </div>
    );
  }

  return (
    <div>
      {/* Page Title */}
      <div className="mb-6">
        <h1 className="text-2xl font-bold text-gray-900">Dashboard</h1>
        <p className="text-gray-500">Welcome to Re-Quest Admin Panel</p>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-6 mb-8">
        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-3 bg-blue-100 rounded-lg">
              <svg
                className="w-6 h-6 text-blue-600"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197M13 7a4 4 0 11-8 0 4 4 0 018 0z"
                />
              </svg>
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-500">Total Users</p>
              <p className="text-2xl font-bold text-gray-900">{stats.totalUsers}</p>
            </div>
          </div>
        </div>
        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-3 bg-green-100 rounded-lg">
              <svg
                className="w-6 h-6 text-green-600"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z"
                />
              </svg>
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-500">Active</p>
              <p className="text-2xl font-bold text-gray-900">{stats.activeUsers}</p>
            </div>
          </div>
        </div>
        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-3 bg-purple-100 rounded-lg">
              <svg
                className="w-6 h-6 text-purple-600"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M21 13.255A23.931 23.931 0 0112 15c-3.183 0-6.22-.62-9-1.745M16 6V4a2 2 0 00-2-2h-4a2 2 0 00-2 2v2m4 6h.01M5 20h14a2 2 0 002-2V8a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"
                />
              </svg>
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-500">Agents</p>
              <p className="text-2xl font-bold text-gray-900">{stats.agents}</p>
            </div>
          </div>
        </div>
        <div className="bg-white rounded-lg shadow p-6">
          <div className="flex items-center">
            <div className="p-3 bg-yellow-100 rounded-lg">
              <svg
                className="w-6 h-6 text-yellow-600"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"
                />
              </svg>
            </div>
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-500">Pending</p>
              <p className="text-2xl font-bold text-gray-900">{stats.pendingUsers}</p>
            </div>
          </div>
        </div>
      </div>

      {/* Recent Users */}
      <div className="bg-white rounded-lg shadow">
        <div className="px-6 py-4 border-b border-gray-200">
          <div className="flex justify-between items-center">
            <h2 className="text-lg font-semibold text-gray-900">Recent Users</h2>
            <Link
              href="/dashboard/users"
              className="text-blue-600 hover:text-blue-700 text-sm font-medium"
            >
              View All →
            </Link>
          </div>
        </div>
        <div className="overflow-x-auto">
          {recentUsers.length === 0 ? (
            <div className="text-center py-12">
              <svg
                className="mx-auto h-12 w-12 text-gray-400"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197M13 7a4 4 0 11-8 0 4 4 0 018 0z"
                />
              </svg>
              <p className="mt-2 text-gray-500">No users found</p>
            </div>
          ) : (
            <table className="min-w-full divide-y divide-gray-200">
              <thead className="bg-gray-50">
                <tr>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    User
                  </th>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    Role
                  </th>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    Status
                  </th>
                  <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">
                    Joined
                  </th>
                </tr>
              </thead>
              <tbody className="bg-white divide-y divide-gray-200">
                {recentUsers.map((user) => (
                  <tr key={user.id} className="hover:bg-gray-50">
                    <td className="px-6 py-4 whitespace-nowrap">
                      <div className="flex items-center">
                        <div className="flex-shrink-0 h-10 w-10">
                          {avatarUrls[user.id] ? (
                            <img
                              className="h-10 w-10 rounded-full object-cover"
                              src={avatarUrls[user.id]}
                              alt=""
                            />
                          ) : (
                            <div className="h-10 w-10 rounded-full bg-gray-200 flex items-center justify-center">
                              <span className="text-gray-500 font-medium text-sm">
                                {user.profile?.firstName?.[0] || user.email[0].toUpperCase()}
                              </span>
                            </div>
                          )}
                        </div>
                        <div className="ml-4">
                          <div className="text-sm font-medium text-gray-900">
                            {user.profile?.firstName} {user.profile?.lastName}
                          </div>
                          <div className="text-sm text-gray-500">{user.email}</div>
                        </div>
                      </div>
                    </td>
                    <td className="px-6 py-4 whitespace-nowrap">
                      <span
                        className={`inline-flex px-2 py-1 text-xs font-semibold rounded-full ${
                          user.role === 'ADMIN'
                            ? 'bg-red-100 text-red-800'
                            : user.role === 'AGENT'
                            ? 'bg-purple-100 text-purple-800'
                            : 'bg-blue-100 text-blue-800'
                        }`}
                      >
                        {user.role}
                      </span>
                    </td>
                    <td className="px-6 py-4 whitespace-nowrap">
                      <span
                        className={`inline-flex px-2 py-1 text-xs font-semibold rounded-full ${
                          user.status === 'ACTIVE'
                            ? 'bg-green-100 text-green-800'
                            : user.status === 'PENDING_VERIFICATION'
                            ? 'bg-yellow-100 text-yellow-800'
                            : user.status === 'SUSPENDED'
                            ? 'bg-red-100 text-red-800'
                            : 'bg-gray-100 text-gray-800'
                        }`}
                      >
                        {user.status === 'PENDING_VERIFICATION' ? 'PENDING' : user.status}
                      </span>
                    </td>
                    <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
                      {new Date(user.createdAt).toLocaleDateString()}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          )}
        </div>
      </div>
    </div>
  );
}