'use client';

import { useState, useEffect } from 'react';
import { useRouter } from 'next/navigation';
import { Card, Input, Button } from '@zen/core/shared/components';

export default function LoginPage({ onSubmit, onNavigate, onSetSessionCookie, redirectAfterLogin = '/', currentUser = null }) {
  const [error, setError] = useState('');
  const [success, setSuccess] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [formData, setFormData] = useState({ email: '', password: '' });
  const [honeypot, setHoneypot] = useState('');
  const [formLoadedAt, setFormLoadedAt] = useState(0);
  const router = useRouter();

  useEffect(() => {
    setFormLoadedAt(Date.now());
  }, []);

  useEffect(() => {
    if (currentUser) {
      router.replace(redirectAfterLogin);
    }
  }, [currentUser, redirectAfterLogin, router]);

  const handleKeyPress = (e) => {
    if (e.key === 'Enter' && !isLoading && !success) {
      handleSubmit();
    }
  };

  const handleSubmit = async () => {
    setError('');
    setSuccess('');
    setIsLoading(true);

    const submitData = new FormData();
    submitData.append('email', formData.email);
    submitData.append('password', formData.password);
    submitData.append('_hp', honeypot);
    submitData.append('_t', String(formLoadedAt));

    try {
      const result = await onSubmit(submitData);

      if (result.success) {
        const successMsg = result.message || 'Connexion réussie ! Redirection...';
        setSuccess(successMsg);
        setIsLoading(false);

        setTimeout(async () => {
          if (result.sessionToken && onSetSessionCookie) {
            await onSetSessionCookie(result.sessionToken);
          }
          router.push(redirectAfterLogin);
        }, 1500);
      } else {
        setError(result.error || 'Échec de la connexion');
        setIsLoading(false);
      }
    } catch (err) {
      console.error('Login error:', err);
      setError('Une erreur inattendue s\'est produite');
      setIsLoading(false);
    }
  };

  return (
    <Card variant="default" padding="md" spacing="none" className="w-full max-w-md">
      <div className="text-center mb-6">
        <h1 className="text-2xl font-bold text-neutral-900 dark:text-white mb-2">
          Connexion
        </h1>
        <p className="text-sm text-neutral-600 dark:text-neutral-400">
          Veuillez vous connecter pour continuer.
        </p>
      </div>

      {currentUser && (
        <div className="mb-4 p-3 bg-blue-50 border border-blue-200 rounded-lg dark:bg-blue-500/10 dark:border-blue-500/20">
          <div className="flex items-center space-x-2">
            <div className="w-3.5 h-3.5 border-2 border-blue-400/50 border-t-blue-600 rounded-full animate-spin flex-shrink-0 dark:border-blue-500/30 dark:border-t-blue-500"></div>
            <span className="text-xs text-blue-700 dark:text-blue-400">Redirection...</span>
          </div>
        </div>
      )}

      {success && !currentUser && (
        <div className="mb-4 p-3 bg-green-50 border border-green-200 rounded-lg dark:bg-green-500/10 dark:border-green-500/20">
          <div className="flex items-center space-x-2">
            <div className="w-1.5 h-1.5 bg-green-500 rounded-full flex-shrink-0"></div>
            <span className="text-xs text-green-700 dark:text-green-400">{success}</span>
          </div>
        </div>
      )}

      {error && !currentUser && !success && (
        <div className="mb-4 p-3 bg-red-50 border border-red-200 rounded-lg dark:bg-red-500/10 dark:border-red-500/20">
          <div className="flex items-center space-x-2">
            <div className="w-1.5 h-1.5 bg-red-500 rounded-full flex-shrink-0"></div>
            <span className="text-xs text-red-700 dark:text-red-400">{error}</span>
          </div>
        </div>
      )}

      <div className={`flex flex-col gap-4 transition-opacity duration-200 ${currentUser ? 'opacity-50 pointer-events-none' : ''}`}>
        <div aria-hidden="true" style={{ position: 'absolute', left: '-9999px', top: '-9999px', width: 0, height: 0, overflow: 'hidden' }}>
          <label htmlFor="_hp_login">Website</label>
          <input id="_hp_login" name="_hp" type="text" tabIndex={-1} autoComplete="off" value={honeypot} onChange={(e) => setHoneypot(e.target.value)} />
        </div>

        <Input
          id="email"
          name="email"
          type="email"
          label="E-mail"
          value={formData.email}
          onChange={(value) => setFormData(prev => ({ ...prev, email: value }))}
          onKeyDown={handleKeyPress}
          placeholder="your@email.com"
          disabled={!!success || !!currentUser}
          required
        />

        <div className="flex flex-col">
          <div className="flex items-center justify-between mb-1.5">
            <span className="text-xs font-medium text-neutral-700 dark:text-white">Mot de passe</span>
            <a
              href="#"
              onClick={(e) => {
                e.preventDefault();
                if (!currentUser) onNavigate('forgot');
              }}
              className="text-xs text-neutral-600 hover:text-neutral-900 transition-colors duration-200 dark:text-neutral-300 dark:hover:text-white"
            >
              Mot de passe oublié ?
            </a>
          </div>
          <Input
            id="password"
            name="password"
            type="password"
            value={formData.password}
            onChange={(value) => setFormData(prev => ({ ...prev, password: value }))}
            onKeyDown={handleKeyPress}
            placeholder="••••••••"
            disabled={!!success || !!currentUser}
          />
        </div>

        <Button
          type="button"
          variant="primary"
          size="lg"
          loading={isLoading}
          disabled={!!success || !!currentUser}
          onClick={handleSubmit}
          className="w-full mt-2"
        >
          Se connecter
        </Button>
      </div>

      <div className={`mt-6 flex justify-center transition-opacity duration-200 ${currentUser ? 'opacity-50 pointer-events-none' : ''}`}>
        <Button
          type="button"
          variant="ghost"
          disabled={!!currentUser}
          onClick={() => { if (!currentUser) onNavigate('register'); }}
        >
          Pas de compte ? S'inscrire
        </Button>
      </div>
    </Card>
  );
}