import React, { useState, useEffect } from 'react';
import { Link, useNavigate, useLocation } from 'react-router-dom';
import { useForm } from 'react-hook-form';
import { EyeIcon, EyeSlashIcon } from '@heroicons/react/24/outline';
import { useAuth } from '../../hooks/useAuth';
import LoadingSpinner from '../../components/UI/LoadingSpinner';
import apiClient from '../../services/api';

const Login = () => {
  const [showPassword, setShowPassword] = useState(false);
  const [registrationEnabled, setRegistrationEnabled] = useState(true);
  const [settingsLoading, setSettingsLoading] = useState(true);
  const { login, loading } = useAuth();
  const navigate = useNavigate();
  const location = useLocation();
  
  const from = location.state?.from?.pathname || '/dashboard';

  const {
    register,
    handleSubmit,
    formState: { errors },
    setError,
  } = useForm();

  // Fetch registration settings
  useEffect(() => {
    const fetchRegistrationSetting = async () => {
      try {
        const response = await apiClient.get('/auth/registration-status');
        setRegistrationEnabled(response.data.data.enabled);
      } catch (error) {
        // If there's an error, default to allowing registration
        console.error('Failed to fetch registration setting:', error);
        setRegistrationEnabled(true);
      } finally {
        setSettingsLoading(false);
      }
    };

    fetchRegistrationSetting();
  }, []);

  const onSubmit = async (data) => {
    console.log('Login form submitted:', data.email);
    const result = await login(data);
    console.log('Login result:', result);
    
    if (result.success) {
      console.log('Login successful, navigating to:', from);
      navigate(from, { replace: true });
    } else {
      console.log('Login failed, showing error:', result.error);
      setError('root', { 
        type: 'manual', 
        message: result.error 
      });
    }
  };

  const handleAuthentikLogin = () => {
    // Redirect to Authentik OAuth endpoint
    window.location.href = `${process.env.REACT_APP_API_URL || 'http://localhost:5000'}/api/auth/authentik`;
  };

  return (
    <div className="space-y-6">
      <div>
        <h2 className="text-2xl font-bold text-gray-900">Sign in to your account</h2>
        {!settingsLoading && registrationEnabled && (
          <p className="mt-2 text-sm text-gray-600">
            Or{' '}
            <Link
              to="/register"
              className="font-medium text-primary-600 hover:text-primary-500"
            >
              create a new account
            </Link>
          </p>
        )}
      </div>

      <form className="space-y-6" onSubmit={handleSubmit(onSubmit)}>
        {errors.root && (
          <div className="rounded-md bg-red-50 p-4">
            <div className="flex">
              <div className="ml-3">
                <h3 className="text-sm font-medium text-red-800">
                  {errors.root.message}
                </h3>
              </div>
            </div>
          </div>
        )}

        <div>
          <label htmlFor="email" className="label">
            Email address
          </label>
          <div className="mt-1">
            <input
              id="email"
              type="email"
              autoComplete="email"
              className={errors.email ? 'input-error' : 'input'}
              {...register('email', {
                required: 'Email is required',
                pattern: {
                  value: /^\S+@\S+$/i,
                  message: 'Invalid email address',
                },
              })}
            />
            {errors.email && (
              <p className="mt-2 text-sm text-red-600">{errors.email.message}</p>
            )}
          </div>
        </div>

        <div>
          <label htmlFor="password" className="label">
            Password
          </label>
          <div className="mt-1 relative">
            <input
              id="password"
              type={showPassword ? 'text' : 'password'}
              autoComplete="current-password"
              className={errors.password ? 'input-error pr-10' : 'input pr-10'}
              {...register('password', {
                required: 'Password is required',
              })}
            />
            <button
              type="button"
              className="absolute inset-y-0 right-0 pr-3 flex items-center"
              onClick={() => setShowPassword(!showPassword)}
            >
              {showPassword ? (
                <EyeSlashIcon className="h-5 w-5 text-gray-400" />
              ) : (
                <EyeIcon className="h-5 w-5 text-gray-400" />
              )}
            </button>
            {errors.password && (
              <p className="mt-2 text-sm text-red-600">{errors.password.message}</p>
            )}
          </div>
        </div>

        <div className="flex items-center justify-between">
          <div className="flex items-center">
            <input
              id="remember-me"
              name="remember-me"
              type="checkbox"
              className="h-4 w-4 text-primary-600 focus:ring-primary-500 border-gray-300 rounded"
            />
            <label htmlFor="remember-me" className="ml-2 block text-sm text-gray-900">
              Remember me
            </label>
          </div>

          <div className="text-sm">
            <Link
              to="/forgot-password"
              className="font-medium text-primary-600 hover:text-primary-500"
            >
              Forgot your password?
            </Link>
          </div>
        </div>

        <div>
          <button
            type="submit"
            disabled={loading}
            className="btn-primary w-full justify-center"
          >
            {loading ? (
              <LoadingSpinner size="sm" color="white" />
            ) : (
              'Sign in'
            )}
          </button>
        </div>

        <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">Or continue with</span>
            </div>
          </div>

          <div className="mt-6">
            <button
              type="button"
              onClick={handleAuthentikLogin}
              className="w-full inline-flex justify-center py-2 px-4 border border-gray-300 rounded-lg shadow-sm bg-white text-sm font-medium text-gray-500 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-primary-500 transition-colors duration-200"
            >
              <svg className="w-5 h-5" viewBox="0 0 24 24" fill="currentColor">
                <path d="M12 2L2 7v10c0 5.55 3.84 9.74 9 11 5.16-1.26 9-5.45 9-11V7l-10-5z"/>
                <path d="M10 17l-4-4 1.41-1.41L10 14.17l6.59-6.59L18 9l-8 8z" fill="white"/>
              </svg>
              <span className="ml-2">Sign in with Authentik</span>
            </button>
          </div>
        </div>
      </form>
    </div>
  );
};

export default Login;