<?php

require_once '../includes/config.php';
require_once '../includes/functions.php';
require_once '../includes/jsondb.php';
require_once '../includes/srs.php';
require_once '../includes/auth.php';

requireLogin();

$user = $_SESSION['user'];

$input = json_decode(file_get_contents('php://input'), true);

$lang = $input['lang'];
$list = $input['list'];
$wordId = (int)$input['wordId'];
$userAnswer = trim($input['answer']);

$file = listPath($user, $lang, $list);

$data = JsonDB::read($file);

$correct = false;

foreach ($data['words'] as $word) {

    if ($word['id'] === $wordId) {

        $correct =
            strtolower($word['answer']) === strtolower($userAnswer);

        updateWordStats($word, $correct);

        break;
    }
}

JsonDB::write($file, $data);

echo json_encode([
    'correct' => $correct
]);