package nasin

import "os"
import "path/filepath"

// ApplicationUserDataDir returns the directory path where an application can
// store its user data files. If the directory does not exist, it will be
// created.
func ApplicationUserDataDir (app ApplicationDescription) (string, error) {
	return userMkdirAll(app.ID, userDataDir)
}

// ApplicationUserConfigDir returns the directory path where an application can
// store its user configuration files.
func ApplicationUserConfigDir (app ApplicationDescription) (string, error) {
	return userMkdirAll(app.ID, userConfigDir)
}

// ApplicationUserCacheDir returns the directory path where an application can
// store its user cache files.
func ApplicationUserCacheDir (app ApplicationDescription) (string, error) {
	return userMkdirAll(app.ID, userCacheDir)
}

func userMkdirAll (sub string, getter func () (string, error)) (string, error) {
	path, err := getter()
	if err != nil { return "", err }
	path = filepath.Join(path, sub)
	err = os.MkdirAll(path, 0700)
	if err != nil { return "", err }
	return path, nil
}