<?php
require_once __DIR__ . '/../config/config.php';
require_once __DIR__ . '/../config/database.php';

header('Content-Type: application/json');

if (!isLoggedIn() || !isEleve()) {
    echo json_encode(['error' => 'Non autorisé']);
    exit;
}

$id_tentative = filter_input(INPUT_POST, 'id_tentative', FILTER_VALIDATE_INT);
$id_question = filter_input(INPUT_POST, 'id_question', FILTER_VALIDATE_INT);

if (!$id_tentative || !$id_question) {
    echo json_encode(['error' => 'Données manquantes']);
    exit;
}

$db = Database::getInstance();

// Vérifier limite
$usage = $db->fetchOne(
    "SELECT messages_count FROM chat_usage_limits 
     WHERE id_tentative = ? AND id_question = ?",
    [$id_tentative, $id_question]
);

$messages_count = $usage['messages_count'] ?? 0;
$remaining = max(0, 3 - $messages_count);

echo json_encode([
    'success' => true,
    'remaining' => $remaining,
    'used' => $messages_count
]);