<?php

namespace app\common\service;

use OSS\OssClient;
use OSS\Core\OssException;
use support\exception\BusinessException;

class OssService
{
    private $accessKeyId;
    private $accessKeySecret;
    private $bucket;
    private $endpoint;
    private $ossClient;

    public function __construct()
    {
        $this->accessKeyId = getenv('OSS_ACCESSID');
        $this->accessKeySecret = getenv('OSS_ACCESSSECRET');
        $this->bucket = getenv('OSS_BUCKET');
        $this->endpoint = getenv('OSS_ENDPOINT');
        $this->ossClient = new OssClient($this->accessKeyId, $this->accessKeySecret, $this->endpoint);
    }

    /**
     * 上传图片到 OSS
     * @param string $filePath 本地文件路径
     * @param string $objectKey OSS上存储的对象名称
     * @return string 图片的 URL
     */
    public function uploadImage($filePath, $objectKey)
    {
        try {
            // 上传文件到 OSS
            $this->ossClient->uploadFile($this->bucket, $objectKey, $filePath);
            // 构造图片的私有 URL
            $url = $this->generatePrivateUrl($objectKey);
            return $url;
        } catch (OssException $e) {
            // 错误处理
            throw new \RuntimeException('OSS Error: ' . $e->getMessage());
        } catch (\Throwable $th) {
            // 错误处理
            throw new BusinessException('Error: ' . $th->getMessage());
        }
    }

    /**
     * 生成图片的私有访问 URL
     * @param string $objectKey
     * @return string
     */
    public function generatePrivateUrl($objectKey, $expireTime = 3600)
    {
        // 生成 OSS 私有 URL（有效期为 3600 秒）
        return $this->ossClient->signUrl($this->bucket, $objectKey, $expireTime);
    }

    /**
     * 附件数组的 url 重签为新的私有访问地址（响应期调用，防止历史签名过期）。
     * 兼容三种存量格式：完整签名URL / 完整未签名URL / 纯对象键。
     * @param array $attachments [{url, original_name}, ...]
     * @param int $expireTime
     * @return array
     */
    public static function resignAttachmentUrls(array $attachments, int $expireTime = 604800): array
    {
        foreach ($attachments as &$a) {
            if (empty($a['url']) || !is_string($a['url'])) {
                continue;
            }
            try {
                $url = $a['url'];
                if (strpos($url, 'http') === 0) {
                    $path = (string)parse_url($url, PHP_URL_PATH);
                    if ($path === '') {
                        continue;
                    }
                    $key = ltrim(urldecode($path), '/');
                } else {
                    $key = ltrim($url, '/'); // 已是对象键
                }
                if ($key === '') {
                    continue;
                }
                $a['url'] = (new self())->generatePrivateUrl($key, $expireTime);
            } catch (\Throwable $e) {
                // 重签失败保留原样
            }
        }
        unset($a);
        return $attachments;
    }

    /**
     * 删除 OSS 上的文件
     * @param string $objectKey OSS上存储的对象名称
     * @return bool 删除是否成功
     */
    public function deleteFile($objectKey)
    {
        try {
            // 删除 OSS 上的文件
            $this->ossClient->deleteObject($this->bucket, $objectKey);
            return true;
        } catch (OssException $e) {
            // 错误处理
            throw new \RuntimeException('OSS Delete Error: ' . $e->getMessage());
        } catch (\Throwable $th) {
            // 错误处理
            throw new BusinessException('Delete Error: ' . $th->getMessage());
        }
    }

    /**
     * 获取对应的 MIME 类型
     */
    public function getMimeTypes($extensions)
    {
        $mimeMap = [
            'jpg' => 'image/jpeg',
            'jpeg' => 'image/jpeg',
            'png' => 'image/png',
            'gif' => 'image/gif',
            'bmp' => 'image/bmp',
            'webp' => 'image/webp',
            'pdf' => 'application/pdf',
            'doc' => 'application/msword',
            'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'xls' => 'application/vnd.ms-excel',
            'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'ppt' => 'application/vnd.ms-powerpoint',
            'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'txt' => 'text/plain',
            'zip' => 'application/zip',
            'rar' => 'application/x-rar-compressed'
        ];

        $mimes = [];
        foreach ($extensions as $ext) {
            if (isset($mimeMap[$ext])) {
                $mimes[] = $mimeMap[$ext];
            }
        }

        return array_unique($mimes);
    }
}