package callback

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
	"os"

	"lone-services/pkg/utils"
)

func BuildDownloadURL(object string) (string, error) {
	endpoint := utils.GetConfigString("oss.internalEndpoint")
	if endpoint == utils.StringEmpty {
		endpoint = utils.GetConfigString("oss.endpoint")
	}
	if endpoint == utils.StringEmpty {
		return utils.StringEmpty, fmt.Errorf("oss endpoint empty")
	}
	return url.JoinPath(endpoint, object)
}

func DownloadFile(fileURL, destPath string) error {
	resp, err := http.Get(fileURL)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("http status %d", resp.StatusCode)
	}

	tmpPath := destPath + ".tmp"
	out, err := os.Create(tmpPath)
	if err != nil {
		return err
	}

	_, copyErr := io.Copy(out, resp.Body)
	closeErr := out.Close()
	if copyErr != nil {
		_ = os.Remove(tmpPath)
		return copyErr
	}
	if closeErr != nil {
		_ = os.Remove(tmpPath)
		return closeErr
	}
	if err = os.Rename(tmpPath, destPath); err != nil {
		_ = os.Remove(tmpPath)
		return err
	}
	return nil
}