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📄 Viewing: ../../l7-pro-2-e-learning-2023-Epolleke/php/check_answer.php

<?php
/**
 * API Endpoint: Controleer het antwoord van de gebruiker
 * POST parameters:
 *   - word_id: ID van het woord
 *   - answer: Het antwoord van de gebruiker
 *   - session_id: Unieke sessie ID
 */

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST');
header('Access-Control-Allow-Headers: Content-Type');

require_once 'config.php';

// Handle preflight requests
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['success' => false, 'error' => 'Method not allowed']);
    exit();
}

try {
    // Lees JSON input
    $rawInput = file_get_contents('php://input');
    $input = json_decode($rawInput, true);
    
    // Check for JSON decode errors
    if (json_last_error() !== JSON_ERROR_NONE) {
        throw new Exception('Invalid JSON: ' . json_last_error_msg());
    }
    
    if (!$input || !is_array($input)) {
        throw new Exception('Invalid request body');
    }
    
    if (!isset($input['word_id']) || !isset($input['answer']) || !isset($input['session_id'])) {
        $missing = [];
        if (!isset($input['word_id'])) $missing[] = 'word_id';
        if (!isset($input['answer'])) $missing[] = 'answer';
        if (!isset($input['session_id'])) $missing[] = 'session_id';
        throw new Exception('Missing required parameters: ' . implode(', ', $missing));
    }
    
    $word_id = intval($input['word_id']);
    $answer = trim(strtolower($input['answer']));
    $session_id = $input['session_id'];
    
    $pdo = getDbConnection();
    
    // Haal het correcte woord op
    $stmt = $pdo->prepare("SELECT english_word, dutch_translation FROM words WHERE word_id = :word_id");
    $stmt->execute([':word_id' => $word_id]);
    $word = $stmt->fetch();
    
    if (!$word) {
        throw new Exception('Word not found');
    }
    
    // Controleer of antwoord correct is
    $correct_answer = strtolower($word['dutch_translation']);
    $is_correct = ($answer === $correct_answer);
    $correct_value = $is_correct ? 1 : 0;
    
    // Update of insert user progress
    $stmt = $pdo->prepare("
        INSERT INTO user_progress (session_id, word_id, attempts, correct, is_mastered)
        VALUES (:session_id, :word_id, 1, :correct, 0)
        ON DUPLICATE KEY UPDATE 
            attempts = attempts + 1,
            correct = correct + :correct_update,
            is_mastered = (correct + :correct_check >= 3),
            last_attempt = CURRENT_TIMESTAMP
    ");
    
    $stmt->execute([
        ':session_id' => $session_id,
        ':word_id' => $word_id,
        ':correct' => $correct_value,
        ':correct_update' => $correct_value,
        ':correct_check' => $correct_value
    ]);
    
    // Haal progress statistieken op
    $stmt = $pdo->prepare("
        SELECT attempts, correct, is_mastered 
        FROM user_progress 
        WHERE session_id = :session_id AND word_id = :word_id
    ");
    $stmt->execute([
        ':session_id' => $session_id,
        ':word_id' => $word_id
    ]);
    $progress = $stmt->fetch();
    
    echo json_encode([
        'success' => true,
        'correct' => $is_correct,
        'correct_answer' => $word['dutch_translation'],
        'english_word' => $word['english_word'],
        'progress' => $progress
    ]);
    
} catch (Exception $e) {
    http_response_code(400);
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage(),
        'debug' => [
            'file' => basename($e->getFile()),
            'line' => $e->getLine()
        ]
    ]);
}
?>

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