<?php
/**
 * GET /api/hub/files/list.php
 *
 * List files in a channel.
 *
 * Query params:
 *   ChannelID  int  REQUIRED
 *   Limit      int  optional  default 50, max 200
 *   Offset     int  optional  default 0
 *
 * Response: { OK: true, Files: [...], Total: int }
 */

require_once __DIR__ . '/../../helpers.php';

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    jsonResponse(['OK' => false, 'ERROR' => 'method_not_allowed'], 405);
}

$channelId = (int) ($_GET['ChannelID'] ?? 0);
$limit = min(max((int) ($_GET['Limit'] ?? 50), 1), 200);
$offset = max((int) ($_GET['Offset'] ?? 0), 0);

if ($channelId <= 0) jsonResponse(['OK' => false, 'ERROR' => 'channel_id_required']);

$total = (int) (queryOne(
    "SELECT COUNT(*) as cnt FROM Hub_Files WHERE ChannelID = ?",
    [$channelId]
)['cnt'] ?? 0);

$rows = queryTimed(
    "SELECT * FROM Hub_Files WHERE ChannelID = ? ORDER BY CreatedAt DESC LIMIT ? OFFSET ?",
    [$channelId, $limit, $offset]
);

$files = [];
foreach ($rows as $r) {
    $files[] = [
        'ID'              => (int) $r['ID'],
        'MessageID'       => $r['MessageID'] ? (int) $r['MessageID'] : null,
        'ChannelID'       => (int) $r['ChannelID'],
        'UploaderAddress' => $r['UploaderAddress'],
        'FileName'        => $r['FileName'],
        'FileSize'        => (int) $r['FileSize'],
        'MimeType'        => $r['MimeType'],
        'DownloadURL'     => baseUrl() . '/' . $r['StoragePath'],
        'ThumbnailURL'    => $r['ThumbnailPath'] ? baseUrl() . '/' . $r['ThumbnailPath'] : null,
        'CreatedAt'       => toISO8601($r['CreatedAt']),
    ];
}

jsonResponse([
    'OK'    => true,
    'Files' => $files,
    'Total' => $total,
]);