package server

import (
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

func boxPath(boxID string) string {
	return filepath.Join(uploadRoot, boxID)
}

func manifestPath(boxID string) string {
	return filepath.Join(boxPath(boxID), boxManifestFile)
}

func safeFilename(name string) (string, bool) {
	filename := filepath.Base(name)
	filename = strings.TrimSpace(filename)
	return filename, filename != "" && filename != "." && filename != string(filepath.Separator)
}

func safeBoxFilePath(boxID string, filename string) (string, bool) {
	path := filepath.Join(boxPath(boxID), filename)
	return path, strings.HasPrefix(path, boxPath(boxID)+string(filepath.Separator))
}

func uniqueFilename(directory string, filename string) string {
	if _, err := os.Stat(filepath.Join(directory, filename)); os.IsNotExist(err) {
		return filename
	}

	extension := filepath.Ext(filename)
	base := strings.TrimSuffix(filename, extension)
	for count := 2; ; count++ {
		candidate := base + "-" + strconv.Itoa(count) + extension
		if _, err := os.Stat(filepath.Join(directory, candidate)); os.IsNotExist(err) {
			return candidate
		}
	}
}

func uniqueManifestFilename(filename string, usedNames map[string]int) string {
	count := usedNames[filename]
	usedNames[filename] = count + 1

	if count == 0 {
		return filename
	}

	extension := filepath.Ext(filename)
	base := strings.TrimSuffix(filename, extension)
	return base + "-" + strconv.Itoa(count+1) + extension
}