'use client';

import { useState } from 'react';
import { useRouter } from 'next/navigation';

export default function AdminLogin() {
  const router = useRouter();
  const [credentials, setCredentials] = useState({ username: '', password: '' });
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setError('');

    // Basit auth - production'da backend ile yapılmalı
    if (credentials.username === 'admin' && credentials.password === 'A2Metro2025!') {
      localStorage.setItem('admin_token', 'authenticated');
      router.push('/yonetim-paneli-a2m-secure/dashboard');
    } else {
      setError('Kullanıcı adı veya şifre hatalı');
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen bg-linear-to-br from-[#003366] via-[#004B87] to-[#005f99] flex items-center justify-center p-4">
      <div className="absolute inset-0 bg-[url('data:image/svg+xml;base64,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')] opacity-30"></div>

      <div className="relative z-10 w-full max-w-md">
        <div className="bg-white rounded-2xl shadow-2xl p-8">
          {/* Logo ve Başlık */}
          <div className="text-center mb-8">
            <div className="inline-flex items-center justify-center w-16 h-16 bg-linear-to-br from-[#004B87] to-[#00B4D8] rounded-xl mb-4">
              <svg className="w-8 h-8 text-white" fill="currentColor" viewBox="0 0 24 24">
                <path d="M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8z"/>
              </svg>
            </div>
            <h1 className="text-2xl font-bold text-[#004B87] mb-2">Yönetim Paneli</h1>
            <p className="text-gray-600 text-sm">A2 Metro Hattı İnşaat Projesi</p>
          </div>

          {/* Login Form */}
          <form onSubmit={handleLogin} className="space-y-6">
            {error && (
              <div className="bg-red-50 border border-red-200 text-red-600 px-4 py-3 rounded-lg text-sm">
                {error}
              </div>
            )}

            <div>
              <label htmlFor="username" className="block text-sm font-semibold text-[#004B87] mb-2">
                Kullanıcı Adı
              </label>
              <input
                type="text"
                id="username"
                value={credentials.username}
                onChange={(e) => setCredentials({ ...credentials, username: e.target.value })}
                className="w-full px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-[#00B4D8] focus:border-transparent outline-none transition-all text-gray-900"
                placeholder="Kullanıcı adınızı girin"
                required
              />
            </div>

            <div>
              <label htmlFor="password" className="block text-sm font-semibold text-[#004B87] mb-2">
                Şifre
              </label>
              <input
                type="password"
                id="password"
                value={credentials.password}
                onChange={(e) => setCredentials({ ...credentials, password: e.target.value })}
                className="w-full px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-[#00B4D8] focus:border-transparent outline-none transition-all text-gray-900"
                placeholder="Şifrenizi girin"
                required
              />
            </div>

            <button
              type="submit"
              disabled={loading}
              className="w-full bg-linear-to-r from-[#004B87] to-[#00B4D8] text-white py-3 rounded-lg font-semibold hover:shadow-lg transition-all duration-300 disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {loading ? 'Giriş yapılıyor...' : 'Giriş Yap'}
            </button>
          </form>

          {/* Footer */}
          <div className="mt-6 text-center">
            <p className="text-xs text-gray-500">
              © 2025 Ankara Büyükşehir Belediyesi
            </p>
          </div>
        </div>
      </div>
    </div>
  );
}
