package aliyun

import (
	"context"
	"fmt"
	"strings"
	"time"

	"git.apinb.com/ops/files/internal/storage"
	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
)

func (c *Client) PrepareUpload(ctx context.Context, request storage.UploadRequest) (storage.UploadInstruction, error) {
	if strings.TrimSpace(request.ObjectKey) == "" {
		return storage.UploadInstruction{}, fmt.Errorf("对象键不能为空")
	}
	if strings.TrimSpace(request.ContentType) == "" {
		return storage.UploadInstruction{}, fmt.Errorf("内容类型不能为空")
	}

	result, err := c.client.Presign(ctx, &oss.PutObjectRequest{
		Bucket:          oss.Ptr(c.bucket),
		Key:             oss.Ptr(request.ObjectKey),
		ContentType:     oss.Ptr(request.ContentType),
		ForbidOverwrite: oss.Ptr("true"),
	}, oss.PresignExpires(time.Duration(c.presignTTL)*time.Second))
	if err != nil {
		return storage.UploadInstruction{}, fmt.Errorf("生成上传预签名: %w", err)
	}

	return storage.UploadInstruction{
		Method:    result.Method,
		URL:       result.URL,
		Headers:   result.SignedHeaders,
		ExpiresAt: result.Expiration,
	}, nil
}