package storage

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

// DownloadObjectToTemp downloads an object into a temporary file and returns
// the cleaned local path.
func DownloadObjectToTemp(ctx context.Context, store ObjectStore, key, pattern string) (string, error) {
	if store == nil {
		return "", fmt.Errorf("object store is required")
	}
	if strings.TrimSpace(pattern) == "" {
		return "", fmt.Errorf("temp file pattern is required")
	}

	tmp, err := os.CreateTemp("", pattern)
	if err != nil {
		return "", fmt.Errorf("create temp file: %w", err)
	}
	path := tmp.Name()
	if err := tmp.Close(); err != nil {
		_ = os.Remove(path)
		return "", fmt.Errorf("close temp file: %w", err)
	}

	if err := store.Download(ctx, key, path); err != nil {
		_ = os.Remove(path)
		return "", err
	}
	return filepath.Clean(path), nil
}