<?php
/**
 * 简航 SimpleNav —— 一键“全部更新”（分批）。
 * 批量刷新每个网站的名称与图标；
 *   · **保留** 用户自定义简称 short_name
 *   · **跳过** 用户自定义图标（icon_custom=1）——只刷新名称
 * 前端按 offset 分批调用，避免一次请求超时。
 * 返回：{ done, total, offset, updated, skipped, failed }
 */
declare(strict_types=1);
require_once __DIR__ . '/_auth.php';
require_login();
send_no_cache();

header('Content-Type: application/json; charset=utf-8');
set_time_limit(90);

$offset = max(0, (int)($_GET['offset'] ?? 0));
$limit  = min(12, max(1, (int)($_GET['limit'] ?? 3)));
$pdo = db();

$total = (int)$pdo->query('SELECT COUNT(*) FROM sites')->fetchColumn();
$rows = $pdo->query('SELECT id, url, icon_custom FROM sites ORDER BY id LIMIT ' . $limit . ' OFFSET ' . $offset)->fetchAll();

$updated = 0;
$skipped = 0;
$failed  = 0;
$now = date('Y-m-d H:i:s');

foreach ($rows as $row) {
    $url = norm_url((string)$row['url']);
    $custom = (int)$row['icon_custom'] === 1;

    $meta = fetch_site_meta($url);
    $domain = domain_of($meta['final_url'] ?: $url);
    $name = $meta['name'] !== '' ? $meta['name'] : $meta['title'];

    $sets = ['updated_at=?'];
    $args = [$now];
    if ($name !== '') { $sets[] = 'name=?'; $args[] = $name; }

    if ($custom) {
        // 用户自定义图标：绝不覆盖
        $skipped++;
    } else {
        $iconFile = download_best_icon($meta['icons'], $domain);
        if ($iconFile !== '') { $sets[] = 'icon=?'; $args[] = $iconFile; }
        if ($iconFile !== '' || $name !== '') { $updated++; } else { $failed++; }
    }
    // 注意：这里绝不修改 short_name（用户自定义简称）

    $args[] = (int)$row['id'];
    try {
        $pdo->prepare('UPDATE sites SET ' . implode(',', $sets) . ' WHERE id=?')->execute($args);
    } catch (Throwable $e) {
        $failed++;
    }
}

$next = $offset + count($rows);
echo json_encode([
    'done'    => $next >= $total || count($rows) === 0,
    'total'   => $total,
    'offset'  => $next,
    'updated' => $updated,
    'skipped' => $skipped,
    'failed'  => $failed,
], JSON_UNESCAPED_UNICODE);