import React, { useState } from 'react';
import { useAuth } from '../../contexts/AuthContext';
import { useNavigate, Link } from 'react-router-dom';

const LoginForm: React.FC = () => {
  const [formData, setFormData] = useState({
    username: '',
    password: '',
  });
  const [error, setError] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  
  const { login } = useAuth();
  const navigate = useNavigate();

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, value } = e.target;
    setFormData(prev => ({
      ...prev,
      [name]: value
    }));
    // Clear error when user starts typing
    if (error) setError('');
  };

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

    if (!formData.username.trim() || !formData.password) {
      setError('Please fill in all fields');
      setIsLoading(false);
      return;
    }

    const result = await login(formData.username, formData.password);
    
    if (result.success) {
      navigate('/dashboard');
    } else {
      setError(result.error || 'Login failed');
    }
    
    setIsLoading(false);
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-blue-50 to-indigo-100 py-12 px-4 sm:px-6 lg:px-8">
      <div className="max-w-md w-full space-y-8">
        <div>
          <div className="mx-auto h-12 w-12 flex items-center justify-center rounded-full bg-indigo-100">
            <svg className="h-8 w-8 text-indigo-600" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
            </svg>
          </div>
          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
            Welcome to TCG Vault
          </h2>
          <p className="mt-2 text-center text-sm text-gray-600">
            Sign in to your account
          </p>
        </div>
        
        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          <div className="rounded-md shadow-sm space-y-4">
            <div>
              <label htmlFor="username" className="block text-sm font-medium text-gray-700 mb-1">
                Username or Email
              </label>
              <input
                id="username"
                name="username"
                type="text"
                required
                className="appearance-none rounded-lg relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
                placeholder="Enter your username or email"
                value={formData.username}
                onChange={handleChange}
                disabled={isLoading}
              />
            </div>
            
            <div>
              <label htmlFor="password" className="block text-sm font-medium text-gray-700 mb-1">
                Password
              </label>
              <input
                id="password"
                name="password"
                type="password"
                required
                className="appearance-none rounded-lg relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
                placeholder="Enter your password"
                value={formData.password}
                onChange={handleChange}
                disabled={isLoading}
              />
            </div>
          </div>

          {error && (
            <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg text-sm">
              {error}
            </div>
          )}

          <div>
            <button
              type="submit"
              disabled={isLoading}
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-lg text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 disabled:opacity-50 disabled:cursor-not-allowed transition-colors duration-200"
            >
              {isLoading ? (
                <>
                  <svg className="animate-spin -ml-1 mr-3 h-5 w-5 text-white" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
                    <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                    <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                  </svg>
                  Signing in...
                </>
              ) : (
                'Sign in'
              )}
            </button>
          </div>

          <div className="text-center">
            <p className="text-sm text-gray-600">
              Don't have an account?{' '}
              <Link 
                to="/register" 
                className="font-medium text-indigo-600 hover:text-indigo-500 transition-colors duration-200"
              >
                Sign up here
              </Link>
            </p>
          </div>
        </form>
      </div>
    </div>
  );
};

export default LoginForm;