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

export default function Login() {
  const [email, setEmail] = useState(''); // Remove pre-filled email
  const [password, setPassword] = useState(''); // Remove pre-filled password
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);
  const [authState, setAuthState] = useState({
    hasToken: false,
    hasUser: false,
    tokenValue: null,
    userValue: null
  });
  
  const navigate = useNavigate();
  const { login, currentUser } = useAuth();

  // Check and display current auth state for debugging
  useEffect(() => {
    const token = localStorage.getItem('token');
    const user = localStorage.getItem('user');
    
    try {
      setAuthState({
        hasToken: !!token,
        hasUser: !!user,
        tokenValue: token ? `${token.substring(0, 10)}...` : null,
        userValue: user ? JSON.parse(user) : null
      });
      
      console.log('Login page loaded with auth state:', {
        hasToken: !!token,
        hasUser: !!user,
        currentUser
      });
    } catch (error) {
      console.error('Error parsing user data:', error);
    }
  }, [currentUser]);

  const handleSubmit = async (e) => {
    e.preventDefault();
    
    try {
      setError('');
      setLoading(true);
      
      console.log('Attempting login with:', { email, password: '***' });
      
      // Try direct API call first
      try {
        const response = await axios.post('/api/auth/login', { email, password });
        console.log('Login response:', response.data);
        
        // Check if the response has the expected structure
        if (response.data && response.data.success === true) {
          const { token, user } = response.data;
          
          console.log('Extracted token and user:', { tokenExists: !!token, user });
          
          // Save token to localStorage
          localStorage.setItem('token', token);
          
          // Set axios default headers for future requests
          axios.defaults.headers.common['Authorization'] = `Bearer ${token}`;
          
          // Update auth context manually
          localStorage.setItem('user', JSON.stringify(user));
          
          console.log('Login successful, redirecting based on role:', user.role);
          
          // Force reload to ensure auth context is properly updated
          window.location.href = '/dashboard';
          return;
        } else {
          console.error('Unexpected response structure:', response.data);
          throw new Error('Invalid response structure from server');
        }
      } catch (directApiError) {
        console.error('Direct API call failed:', directApiError);
        console.error('Error details:', directApiError.response ? directApiError.response.data : 'No response data');
        
        // If the error is a 401, show appropriate message
        if (directApiError.response?.status === 401) {
          setError('Invalid email or password');
          return;
        }
        
        throw directApiError;
      }
    } catch (error) {
      setError('Failed to log in. Please check your credentials.');
      console.error('Login error:', error);
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-blue-50 via-white to-purple-50 py-12 px-4 sm:px-6 lg:px-8">
      <div className="max-w-md w-full space-y-8 animate-fadeIn">
        {/* Logo and Title */}
        <div className="text-center">
          <div className="mx-auto h-20 w-20 bg-gradient-to-br from-blue-600 to-purple-600 rounded-2xl flex items-center justify-center shadow-2xl">
            <span className="text-white text-3xl font-bold">II</span>
          </div>
          <h2 className="mt-6 text-4xl font-extrabold text-gray-900 tracking-tight">
            InInventer
          </h2>
          <p className="mt-2 text-base text-gray-600">
            Sign in to manage your inventory
          </p>
        </div>

        {/* Login Form */}
        <div className="mt-8 bg-white rounded-2xl shadow-2xl overflow-hidden">
          <div className="px-8 py-10">
            {error && (
              <div className="alert alert-error mb-6 animate-fadeIn">
                <svg className="w-5 h-5 flex-shrink-0" fill="currentColor" viewBox="0 0 20 20">
                  <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z" clipRule="evenodd" />
                </svg>
                <span>{error}</span>
              </div>
            )}
            
            <form className="space-y-6" onSubmit={handleSubmit}>
              <div>
                <label htmlFor="email" className="form-label">
                  Email address
                </label>
                <input
                  id="email"
                  name="email"
                  type="email"
                  autoComplete="email"
                  required
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  className="form-input"
                  placeholder="Enter your email"
                />
              </div>

              <div>
                <label htmlFor="password" className="form-label">
                  Password
                </label>
                <input
                  id="password"
                  name="password"
                  type="password"
                  autoComplete="current-password"
                  required
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="form-input"
                  placeholder="Enter your password"
                />
              </div>

              <div>
                <button
                  type="submit"
                  disabled={loading}
                  className="w-full btn btn-primary text-base py-3"
                >
                  {loading ? (
                    <div className="flex items-center justify-center">
                      <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...
                    </div>
                  ) : (
                    'Sign in'
                  )}
                </button>
              </div>
            </form>
          </div>

          {/* Footer */}
          <div className="px-8 py-4 bg-gray-50 border-t border-gray-100">
            <p className="text-xs text-center text-gray-500">
              © 2025 InInventer. All rights reserved.
            </p>
          </div>
        </div>
      </div>
    </div>
  );
}