import { useState } from 'react';
import { useRouter } from 'next/router';
import Layout from '../components/Layout';

export default function Login() {
  const router = useRouter();
  const [formData, setFormData] = useState({
    email: '',
    password: ''
  });
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');

  const handleInputChange = (field, value) => {
    setFormData(prev => ({
      ...prev,
      [field]: value
    }));
    // Clear error when user starts typing
    if (error) setError('');
  };

  const handleSubmit = async (e) => {
    e.preventDefault();
    setLoading(true);
    setError('');

    try {
      const response = await fetch('/api/auth/login', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(formData)
      });

      const data = await response.json();

      if (response.ok) {
        // Store the JWT token in localStorage
        localStorage.setItem('auth_token', data.token);
        
        // Redirect to admin panel or dashboard
        if (data.user.role === 'admin') {
          router.push('/admin/card-editor');
        } else {
          router.push('/dashboard');
        }
      } else {
        setError(data.error || 'Login failed');
      }
    } catch (error) {
      console.error('Login error:', error);
      setError('Network error. Please try again.');
    } finally {
      setLoading(false);
    }
  };

  const handleQuickAdminLogin = () => {
    setFormData({
      email: 'admin@tcgvault.com',
      password: 'admin123'
    });
  };

  return (
    <Layout user={null}>
      <div className="min-h-screen flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
        <div className="max-w-md w-full space-y-8">
          <div>
            <div className="text-center">
              <div className="text-6xl mb-4">🃏</div>
              <h2 className="text-3xl font-bold" style={{ color: 'var(--text-primary)' }}>
                Sign in to TCG Vault
              </h2>
              <p className="mt-2 text-sm" style={{ color: 'var(--text-secondary)' }}>
                Access your trading card collection
              </p>
            </div>
          </div>

          <div className="p-8 rounded-2xl shadow-lg" style={{ backgroundColor: 'var(--bg-secondary)' }}>
            <form onSubmit={handleSubmit} className="space-y-6">
              {error && (
                <div className="p-4 rounded-lg bg-red-100 border border-red-200">
                  <p className="text-red-700 text-sm">{error}</p>
                </div>
              )}

              <div>
                <label htmlFor="email" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                  Email Address
                </label>
                <input
                  id="email"
                  name="email"
                  type="email"
                  autoComplete="email"
                  required
                  value={formData.email}
                  onChange={(e) => handleInputChange('email', e.target.value)}
                  className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-purple-500 focus:border-transparent"
                  style={{
                    backgroundColor: 'var(--bg-primary)',
                    borderColor: 'var(--border)',
                    color: 'var(--text-primary)'
                  }}
                  placeholder="Enter your email"
                />
              </div>

              <div>
                <label htmlFor="password" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                  Password
                </label>
                <input
                  id="password"
                  name="password"
                  type="password"
                  autoComplete="current-password"
                  required
                  value={formData.password}
                  onChange={(e) => handleInputChange('password', e.target.value)}
                  className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-purple-500 focus:border-transparent"
                  style={{
                    backgroundColor: 'var(--bg-primary)',
                    borderColor: 'var(--border)',
                    color: 'var(--text-primary)'
                  }}
                  placeholder="Enter your password"
                />
              </div>

              <div>
                <button
                  type="submit"
                  disabled={loading}
                  className={`w-full px-4 py-3 rounded-lg font-medium transition-all duration-200 ${
                    loading 
                      ? 'opacity-50 cursor-not-allowed' 
                      : 'gradient-bg-purple text-white hover:shadow-lg transform hover:scale-105'
                  }`}
                >
                  {loading ? (
                    <div className="flex items-center justify-center">
                      <div className="animate-spin rounded-full h-5 w-5 border-b-2 border-white mr-2"></div>
                      Signing in...
                    </div>
                  ) : (
                    'Sign in'
                  )}
                </button>
              </div>

              {/* Quick Admin Login for Development */}
              <div className="mt-6 pt-6 border-t" style={{ borderColor: 'var(--border)' }}>
                <div className="text-center">
                  <p className="text-sm mb-3" style={{ color: 'var(--text-secondary)' }}>
                    Development Quick Login:
                  </p>
                  <button
                    type="button"
                    onClick={handleQuickAdminLogin}
                    className="px-4 py-2 rounded-lg text-sm font-medium border transition-all duration-200 hover:shadow-md"
                    style={{
                      backgroundColor: 'var(--bg-primary)',
                      borderColor: 'var(--border)',
                      color: 'var(--text-primary)'
                    }}
                  >
                    🔧 Fill Admin Credentials
                  </button>
                </div>
              </div>
            </form>

            <div className="mt-6 text-center">
              <p className="text-sm" style={{ color: 'var(--text-secondary)' }}>
                Don't have an account?{' '}
                <button 
                  onClick={() => router.push('/register')}
                  className="font-medium hover:underline"
                  style={{ color: 'var(--text-accent)' }}
                >
                  Sign up
                </button>
              </p>
            </div>
          </div>

          {/* Admin Info Card */}
          <div className="p-4 rounded-xl border" style={{ backgroundColor: 'var(--bg-secondary)', borderColor: 'var(--border)' }}>
            <div className="text-center">
              <h3 className="text-sm font-semibold mb-2" style={{ color: 'var(--text-primary)' }}>
                🛡️ Admin Access
              </h3>
              <div className="text-xs space-y-1" style={{ color: 'var(--text-secondary)' }}>
                <p><strong>Email:</strong> admin@tcgvault.com</p>
                <p><strong>Password:</strong> admin123</p>
              </div>
            </div>
          </div>
        </div>
      </div>
    </Layout>
  );
}