<?php
declare(strict_types=1);

namespace App\Service;

use Hyperf\Redis\Redis;

class FileService
{
    private Redis $redis;
    private string $cachePrefix = 'file_cache:';
    private int $cacheExpire = 3600; // 1小时缓存

    public function __construct(Redis $redis)
    {
        $this->redis = $redis;
    }

    public function getCachedFile(string $url): ?string
    {
        $cacheKey = $this->cachePrefix . md5($url);
        $result = $this->redis->get($cacheKey);
        return $result === false ? null : $result;
    }

    public function cacheFile(string $url, string $content): void
    {
        $cacheKey = $this->cachePrefix . md5($url);
        $this->redis->setex($cacheKey, $this->cacheExpire, $content);
    }

    public function downloadWithProgress(string $url, callable $progressCallback = null): string|false
    {
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 120,
            CURLOPT_CONNECTTIMEOUT => 30,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_MAXREDIRS => 5,
            CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_ENCODING => '',
            CURLOPT_NOPROGRESS => false,
            CURLOPT_PROGRESSFUNCTION => $progressCallback
        ]);

        $content = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($content === false || $httpCode !== 200) {
            return false;
        }

        return $content;
    }
}