import { useState } from 'react';
import { Lock, User, Eye, EyeOff, MessageCircle } from 'lucide-react';
import './LoginPage.css';
import { loginAdmin, syncAdminUsernameFromJWT } from '../../api/api_admin';
import { useNavigate } from 'react-router-dom';

interface AdminLoginRequest {
  username: string;
  password: string;
}

const LoginCabine = () => {
  const navigate = useNavigate();

  const [formData, setFormData] = useState<AdminLoginRequest>({
    username: '',
    password: ''
  });

  const [showPassword, setShowPassword] = useState(false);
  const [errors, setErrors] = useState<{ username?: string; password?: string }>({});
  const [isLoading, setIsLoading] = useState(false);
  const [apiError, setApiError] = useState<string>('');

  /**
   * ✅ Valider le formulaire
   */
  const validateForm = (): boolean => {
    const newErrors: { username?: string; password?: string } = {};

    console.log('🔍 [ADMIN_LOGIN] Validation - Username:', `"${formData.username}"`);
    console.log('🔍 [ADMIN_LOGIN] Après trim:', `"${formData.username.trim()}"`);

    if (!formData.username.trim()) {
      newErrors.username = 'L\'username admin est requis';
    } else if (formData.username.trim().length < 3) {
      newErrors.username = 'Username invalide (minimum 3 caractères)';
    }

    if (!formData.password) {
      newErrors.password = 'Le mot de passe est requis';
    } else if (formData.password.length < 6) {
      newErrors.password = 'Le mot de passe doit contenir au moins 6 caractères';
    }

    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  /**
   * ✅ Soumettre le formulaire
   */
  const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();

    if (!validateForm()) return;

    setIsLoading(true);
    setApiError('');

    try {
      console.log('🔐 [ADMIN_LOGIN] Appel API avec:', {
        username: formData.username,
        password: '***'
      });

      // ✅ Appeler la fonction de login admin sécurisée
      const result = await loginAdmin(formData.username, formData.password);

      console.log('📋 [ADMIN_LOGIN] Résultat:', {
        success: result.success,
        message: result.message,
        hasToken: !!result.access_token,
        role: result.user?.role
      });

      if (result.success && result.access_token) {
        console.log('✅ [ADMIN_LOGIN] Connexion admin réussie!');

        // ✅ La synchronisation JWT est AUTOMATIQUE dans loginAdmin()
        // Pas besoin de le faire ici
        console.log('✅ [ADMIN_LOGIN] Token et username admin synchronisés');

        // ✅ Vérifier la synchronisation
        const syncedUsername = syncAdminUsernameFromJWT();
        console.log('✅ [ADMIN_LOGIN] Username admin synchronisé:', syncedUsername);

        // ✅ Redirection vers dashboard admin
        console.log('✅ [ADMIN_LOGIN] Redirection vers /admin/dashboard');
        navigate('/cabine/dashboard');
      } else {
        // ❌ Erreur API
        const errorMessage = result.message || 'Identifiants admin incorrects';
        console.error('❌ [ADMIN_LOGIN] Erreur API:', errorMessage);
        setApiError(errorMessage);
        setErrors({ username: errorMessage });
      }
    } catch (err) {
      console.error('💥 [ADMIN_LOGIN] Erreur catch:', err);
      const errorMessage = err instanceof Error ? err.message : 'Erreur de connexion admin';
      setApiError(errorMessage);
      setErrors({ username: errorMessage });
    } finally {
      setIsLoading(false);
    }
  };

  /**
   * ✅ Gérer les changements d'input
   */
  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, value } = e.target;
    setFormData(prev => ({
      ...prev,
      [name]: value
    }));

    // Effacer l'erreur de ce champ
    if (errors[name as keyof typeof errors]) {
      setErrors(prev => ({
        ...prev,
        [name]: undefined
      }));
    }

    // Effacer l'erreur API si l'utilisateur recommence à saisir
    if (apiError) {
      setApiError('');
    }
  };

  return (
    <div className="login-container">
      <div className="login-content">
        <div className="login-header">
          <div className="login-logo">
            <MessageCircle className="w-8 h-8 text-white" />
          </div>
          <h1 className="login-title">Connexion cabine</h1>
          <p className="login-subtitle">Accédez au panneau cabine</p>
        </div>

        <div className="login-card">
          <form className="login-form" onSubmit={handleSubmit}>

            {/* ✅ Erreur API globale */}
            {apiError && (
              <div className="error-banner" style={{
                padding: '12px',
                marginBottom: '16px',
                backgroundColor: '#fee',
                borderLeft: '4px solid #f44',
                borderRadius: '4px',
                color: '#c33'
              }}>
                ⚠️ {apiError}
              </div>
            )}

            {/* Username Admin */}
            <div className="form-group">
              <label htmlFor="username" className="form-label">
                Username Administrateur
              </label>
              <div className="input-wrapper">
                <User className="input-icon" style={{ width: '20px', height: '20px' }} />
                <input
                  type="text"
                  id="username"
                  name="username"
                  value={formData.username}
                  onChange={handleChange}
                  className={`form-input ${errors.username ? 'error' : ''}`}
                  placeholder="Username admin"
                  style={{ paddingLeft: '3rem' }}
                  disabled={isLoading}
                  autoComplete="username"
                />
              </div>
              {errors.username && (
                <p className="error-message">{errors.username}</p>
              )}
            </div>

            {/* Password */}
            <div className="form-group">
              <label htmlFor="password" className="form-label">
                Mot de passe
              </label>
              <div className="input-wrapper">
                <Lock className="input-icon" style={{ width: '20px', height: '20px' }} />
                <input
                  type={showPassword ? 'text' : 'password'}
                  id="password"
                  name="password"
                  value={formData.password}
                  onChange={handleChange}
                  className={`form-input ${errors.password ? 'error' : ''}`}
                  placeholder="••••••••"
                  style={{ paddingLeft: '3rem', paddingRight: '3rem' }}
                  disabled={isLoading}
                  autoComplete="current-password"
                />
                <button
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className="password-toggle"
                  disabled={isLoading}
                >
                  {showPassword ? (
                    <EyeOff style={{ width: '20px', height: '20px' }} />
                  ) : (
                    <Eye style={{ width: '20px', height: '20px' }} />
                  )}
                </button>
              </div>
              {errors.password && (
                <p className="error-message">{errors.password}</p>
              )}
            </div>

            {/* Submit Button */}
            <button
              type="submit"
              disabled={isLoading}
              className="submit-button"
              style={{
                opacity: isLoading ? 0.6 : 1,
                cursor: isLoading ? 'not-allowed' : 'pointer'
              }}
            >
              {isLoading ? (
                <span className="loading-spinner">
                  Connexion en cours...
                </span>
              ) : (
                'Se connecter'
              )}
            </button>
          </form>

          {/* Info sécurité */}
          <div className="signup-section">
            <p className="signup-text" style={{ color: '#9ca3af', fontSize: '0.8rem' }}>
              Accès réservé aux administrateurs
            </p>
          </div>
        </div>

        {/* Footer */}
        <div className="login-footer">
          <p>
            Besoin d'aide ? Contactez le support technique
          </p>
        </div>
      </div>
    </div>
  );
};

export default LoginCabine;