<?php
namespace app\service;
use Aws\S3\S3Client;
use think\facade\Log;
use think\File;

class AwsUploadService
{
    /**
     * 处理表单文件上传并转发到目标服务器
     *
     * @param string $fileField 表单文件字段名
     * @param array $extraFields 额外传递的字段
     * @return array 包含上传结果的数组
     */
    public function uploadAndForward( File $file, string $fileField,array $extraFields = []): array
    {

        $mimeType = $file->getMime();
        $s3config = config('filesystem.disks.s3');
        $s3 = new S3Client($s3config);
        try {
            $config = config('app.upload_conf');
            $configs=[];
            foreach ($config as $key=>$con){
                $configs[] = $key.':'.$con;
            }

           // 验证文件
            $validate = validate([
                $fileField =>implode('|',$configs),
            ]);

            if (!$validate->check([$fileField => $file])) {
                return $this->createErrorResult($validate->getError());
            }

            // 根据文件类型设置 Content-Type
            if (in_array($mimeType, config('app.imageMimeTypes'))) {
                $contentType = $mimeType; // 使用图片的实际 MIME 类型
            } else {
                $contentType = 'application/octet-stream'; // 非图片文件使用默认类型
            }
            $checkBucket = $this->checkBucket($s3, $extraFields['Bucket']);
            if (!$checkBucket) {
                return $this->createErrorResult('Bucket error');
            }
            $s3->putObject([
                'Bucket' => $extraFields['Bucket'],
                'Key' => $extraFields['Key'],
                'Body' => fopen($file->getRealPath(), 'r'),
                'ACL' => 'public-read',
                'ContentType'  => $contentType, // 设置检测到的 Content-Type
            ]);
            return [
                'code' => 1,
                'data' =>[
                    'savename'=>$s3config['endpoint'].'/'.$extraFields['Bucket'].'/'.$extraFields['Key']
                ] ,
            ];
        } catch (\Exception $e) {
            return $this->createErrorResult('上传过程中发生异常: ' . $e->getMessage());
        }
    }
    public function checkBucket($s3, $bucket)
    {
        try {
            $buckets = $s3->listBuckets()->get('Buckets');
            $buckets_arr = array_column($buckets, 'Name');
            if (!in_array($bucket, $buckets_arr)) {
                $s3->createBucket([
                    'Bucket' => $bucket,
                ]);
                $policy = [
                    'Version' => '2012-10-17',
                    'Statement' => [
                        [
                            'Effect' => 'Allow',
                            'Principal' => ['AWS' => ['*']],
                            'Action' => [
                                's3:GetBucketLocation',
                                's3:ListBucket',
                                's3:ListBucketMultipartUploads',
                            ],
                            'Resource' => "arn:aws:s3:::$bucket",
                        ],
                        [
                            'Effect' => 'Allow',
                            'Principal' => ['AWS' => ['*']],
                            'Action' => [
                                's3:DeleteObject',
                                's3:GetObject',
                                's3:ListMultipartUploadParts',
                                's3:PutObject',
                                's3:AbortMultipartUpload',
                            ],
                            'Resource' => "arn:aws:s3:::$bucket/*",
                        ],
                    ],
                ];
                $s3->putBucketPolicy([
                    'Bucket' => $bucket,
                    'Policy' => json_encode($policy),
                ]);
            }
            return true;
        } catch (\Exception $e) {
            Log::info('checkBucket error:' . $e->getMessage());
            return false;
        }

    }
    /**
     * 创建错误结果数组
     *
     * @param string $message 错误信息
     * @return array 错误结果
     */
    private function createErrorResult(string $message): array
    {
        return [
            'code' => 0,
            'error' => $message
        ];
    }
}