package mount

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"
)

func preserveFailedWrite(tempPath, remotePath string) (string, error) {
	cacheDir, err := os.UserCacheDir()
	if err != nil {
		return tempPath, err
	}
	recoveryDir := filepath.Join(cacheDir, "bdrclone", "failed-writes")
	if err := os.MkdirAll(recoveryDir, 0o700); err != nil {
		return tempPath, err
	}
	name := strings.ReplaceAll(filepath.Base(remotePath), string(filepath.Separator), "_")
	if name == "" || name == "." {
		name = "remote-file"
	}
	destination := filepath.Join(recoveryDir, fmt.Sprintf("%s-%s", time.Now().Format("20060102-150405.000000000"), name))
	if err := os.Rename(tempPath, destination); err != nil {
		return tempPath, err
	}
	return destination, nil
}