<?php
/**
 * 阿里云 OSS 服务（在最开始设置错误报告）
 */

namespace app\Service;

class OssService
{
    private string $accessKeyId;
    private string $accessKeySecret;
    private string $bucket;
    private string $endpoint;
    private string $staticUrl;
    private string $mainDir;
    private $ossClient = null;

    public function __construct()
    {
        // 在构造函数开始时就禁用 deprecated 警告
        $oldLevel = error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED);

        try {
            $this->accessKeyId = getenv('OSS_ACCESSID') ?: '';
            $this->accessKeySecret = getenv('OSS_ACCESSSECRET') ?: '';
            $this->bucket = getenv('OSS_BUCKET') ?: '';
            $this->endpoint = getenv('OSS_ENDPOINT') ?: '';
            $this->staticUrl = getenv('OSS_STATIC_URL') ?: '';
            $this->mainDir = rtrim(getenv('OSS_MAIN_DIR') ?: 'uploads', '/');

            if (empty($this->accessKeyId) || empty($this->accessKeySecret) || empty($this->bucket) || empty($this->endpoint)) {
                throw new \Exception('OSS 配置不完整，请检查 .env 文件');
            }
        } finally {
            error_reporting($oldLevel);
        }
    }

    /**
     * 获取 OSS Client 实例（延迟加载 + 错误抑制）
     */
    private function getClient()
    {
        if ($this->ossClient === null) {
            $oldLevel = error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED);

            try {
                $this->ossClient = new \OSS\OssClient($this->accessKeyId, $this->accessKeySecret, $this->endpoint);
            } catch (\Throwable $e) {
                throw new \Exception('OSS 初始化失败: ' . $e->getMessage());
            } finally {
                error_reporting($oldLevel);
            }
        }
        return $this->ossClient;
    }

    /**
     * 上传文件到 OSS
     *
     * @param string $filePath 本地文件路径
     * @param string $objectKey OSS上存储的对象名称
     * @return string 文件的公共访问 URL
     * @throws \Exception
     */
    public function uploadFile(string $filePath, string $objectKey): string
    {
        $oldLevel = error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED);
        try {
            $options = [
                \OSS\OssClient::OSS_HEADERS => [
                    'Content-Type' => $this->getMimeType($filePath),
                ],
            ];

            $this->getClient()->uploadFile($this->bucket, $objectKey, $filePath, $options);
            return $this->getPublicUrl($objectKey);
        } catch (\OSS\Core\OssException $e) {
            throw new \Exception('OSS 上传失败: ' . $e->getMessage());
        } catch (\Throwable $e) {
            throw new \Exception('OSS 上传失败: ' . $e->getMessage());
        } finally {
            error_reporting($oldLevel);
        }
    }

    /**
     * 删除 OSS 上的文件
     *
     * @param string $objectKey OSS上存储的对象名称
     * @return bool
     * @throws \Exception
     */
    public function deleteFile(string $objectKey): bool
    {
        $oldLevel = error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED);
        try {
            $this->getClient()->deleteObject($this->bucket, $objectKey);
            return true;
        } catch (\OSS\Core\OssException $e) {
            throw new \Exception('OSS 删除失败: ' . $e->getMessage());
        } catch (\Throwable $e) {
            throw new \Exception('OSS 删除失败: ' . $e->getMessage());
        } finally {
            error_reporting($oldLevel);
        }
    }

    /**
     * 批量删除文件
     *
     * @param array $objectKeys 对象名称数组
     * @return bool
     * @throws \Exception
     */
    public function deleteFiles(array $objectKeys): bool
    {
        $oldLevel = error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED);
        try {
            $this->getClient()->deleteObjects($this->bucket, $objectKeys);
            return true;
        } catch (\OSS\Core\OssException $e) {
            throw new \Exception('OSS 批量删除失败: ' . $e->getMessage());
        } catch (\Throwable $e) {
            throw new \Exception('OSS 批量删除失败: ' . $e->getMessage());
        } finally {
            error_reporting($oldLevel);
        }
    }

    /**
     * 获取文件的公共访问 URL
     *
     * @param string $objectKey
     * @return string
     */
    public function getPublicUrl(string $objectKey): string
    {
        if (!empty($this->staticUrl)) {
            return rtrim($this->staticUrl, '/') . '/' . $objectKey;
        }

        return 'https://' . $this->bucket . '.' . str_replace('https://', '', $this->endpoint) . '/' . $objectKey;
    }

    /**
     * 生成带签名的访问 URL（用于私有bucket）
     *
     * @param string $objectKey
     * @param int $timeout 有效期（秒）
     * @return string
     */
    public function getSignedUrl(string $objectKey, int $timeout = 3600): string
    {
        $oldLevel = error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED);
        try {
            return $this->getClient()->signUrl($this->bucket, $objectKey, $timeout);
        } catch (\Throwable $e) {
            return $this->getPublicUrl($objectKey);
        } finally {
            error_reporting($oldLevel);
        }
    }

    /**
     * 获取完整的对象键（包含主目录）
     *
     * @param string $path 相对路径
     * @return string
     */
    public function getObjectKey(string $path): string
    {
        $path = ltrim($path, '/');
        return $this->mainDir ? ($this->mainDir . '/' . $path) : $path;
    }

    /**
     * 检查 OSS 是否已配置
     *
     * @return bool
     */
    public static function isConfigured(): bool
    {
        return !empty(getenv('OSS_ACCESSID'))
            && !empty(getenv('OSS_ACCESSSECRET'))
            && !empty(getenv('OSS_BUCKET'))
            && !empty(getenv('OSS_ENDPOINT'));
    }

    /**
     * 获取文件的 MIME 类型
     *
     * @param string $filePath
     * @return string
     */
    private function getMimeType(string $filePath): string
    {
        $extension = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));

        $mimeMap = [
            'jpg' => 'image/jpeg',
            'jpeg' => 'image/jpeg',
            'png' => 'image/png',
            'gif' => 'image/gif',
            'webp' => 'image/webp',
            'bmp' => 'image/bmp',
            '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',
            'txt' => 'text/plain',
            'zip' => 'application/zip',
        ];

        return $mimeMap[$extension] ?? 'application/octet-stream';
    }

    /**
     * 获取 OSS 主目录
     *
     * @return string
     */
    public function getMainDir(): string
    {
        return $this->mainDir;
    }
}