import { useState } from 'react';
import { useRouter } from 'next/router';
import { useAuth } from '../lib/auth-context.js';

export default function Login() {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);
  const [isRegister, setIsRegister] = useState(false);
  
  const { login, register } = useAuth();
  const router = useRouter();

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

    try {
      const result = isRegister 
        ? await register(email, password)
        : await login(email, password);

      if (result.success) {
        router.push('/dashboard');
      } else {
        setError(result.error);
      }
    } catch (error) {
      setError('An unexpected error occurred');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen bg-gray-50 flex flex-col justify-center py-12 sm:px-6 lg:px-8">
      <div className="sm:mx-auto sm:w-full sm:max-w-md">
        <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
          {isRegister ? 'Create your account' : 'Sign in to your account'}
        </h2>
        <p className="mt-2 text-center text-sm text-gray-600">
          {isRegister ? 'Already have an account?' : "Don't have an account?"}{' '}
          <button
            onClick={() => setIsRegister(!isRegister)}
            className="font-medium text-blue-600 hover:text-blue-500"
          >
            {isRegister ? 'Sign in' : 'Sign up'}
          </button>
        </p>
      </div>

      <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">
        <div className="bg-white py-8 px-4 shadow sm:rounded-lg sm:px-10">
          <form className="space-y-6" onSubmit={handleSubmit}>
            {error && (
              <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded">
                {error}
              </div>
            )}

            <div>
              <label htmlFor="email" className="block text-sm font-medium text-gray-700">
                Email address
              </label>
              <div className="mt-1">
                <input
                  id="email"
                  name="email"
                  type="email"
                  autoComplete="email"
                  required
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  className="input-field"
                  placeholder="Enter your email"
                />
              </div>
            </div>

            <div>
              <label htmlFor="password" className="block text-sm font-medium text-gray-700">
                Password
              </label>
              <div className="mt-1">
                <input
                  id="password"
                  name="password"
                  type="password"
                  autoComplete="current-password"
                  required
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="input-field"
                  placeholder="Enter your password"
                />
              </div>
            </div>

            <div>
              <button
                type="submit"
                disabled={loading}
                className="w-full btn-primary disabled:opacity-50 disabled:cursor-not-allowed"
              >
                {loading ? 'Loading...' : (isRegister ? 'Create Account' : 'Sign In')}
              </button>
            </div>
          </form>

          {!isRegister && (
            <div className="mt-6">
              <div className="relative">
                <div className="absolute inset-0 flex items-center">
                  <div className="w-full border-t border-gray-300" />
                </div>
                <div className="relative flex justify-center text-sm">
                  <span className="px-2 bg-white text-gray-500">Demo Account</span>
                </div>
              </div>
              <div className="mt-6 text-center text-sm text-gray-600">
                <p>Email: admin@tcgvault.com</p>
                <p>Password: admin123</p>
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}