<?php

declare(strict_types=1);

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

header('Content-Type: application/json; charset=utf-8');

try {

    if (!isset($_SESSION['user'])) {
        echo json_encode([
            'error' => 'not_logged_in'
        ]);
        exit;
    }

    $user = $_SESSION['user'];

    $lang = $_GET['lang'] ?? '';
    $list = $_GET['list'] ?? '';

    if ($lang === '' || $list === '') {
        echo json_encode([
            'error' => 'missing_params'
        ]);
        exit;
    }

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

    if (!file_exists($file)) {
        echo json_encode([
            'error' => 'file_not_found',
            'file' => $file
        ]);
        exit;
    }

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

    if (!is_array($data) || !isset($data['words'])) {
        echo json_encode([
            'error' => 'invalid_data_structure'
        ]);
        exit;
    }

    echo json_encode([
        'ok' => true,
        'metadata' => $data['metadata'] ?? null,
        'words' => $data['words']
    ]);

} catch (Throwable $e) {

    http_response_code(500);

    echo json_encode([
        'error' => 'server_exception',
        'message' => $e->getMessage()
    ]);
}