package workspace

import (
	"regexp"

	"codespace/internal/util"
)

var idPattern = regexp.MustCompile(`^[A-Za-z0-9._-]+$`)

// ValidID reports whether id is a safe workspace identifier: only letters,
// digits, '-', '_', '.' and non-empty. The bare values "." and ".." are
// rejected because they would resolve to the parent or current directory.
func ValidID(id string) bool {
	if id == "" || id == "." || id == ".." {
		return false
	}
	return idPattern.MatchString(id)
}

// RootFor returns the absolute workspace root path for the given base root and
// workspace id. The result is filepath-cleaned.
func RootFor(baseRoot, id string) string {
	return util.JoinClean(baseRoot, id)
}