package turbopath

import (
	"fmt"
	"path/filepath"
)

// RelativeSystemPath is a relative path using system separators.
type RelativeSystemPath string

// CheckedToRelativeSystemPath inspects a string and determines if it is a relative path.
func CheckedToRelativeSystemPath(s string) (RelativeSystemPath, error) {
	if filepath.IsAbs(s) {
		return "", fmt.Errorf("%v is not a relative path", s)
	}
	return RelativeSystemPath(filepath.Clean(s)), nil
}

// MakeRelativeSystemPath joins the given segments in a system-appropriate way
func MakeRelativeSystemPath(segments ...string) RelativeSystemPath {
	return RelativeSystemPath(filepath.Join(segments...))
}

// ToString returns a string represenation of this Path.
// Used for interfacing with APIs that require a string.
func (p RelativeSystemPath) ToString() string {
	return string(p)
}

// ToSystemPath returns itself.
func (p RelativeSystemPath) ToSystemPath() RelativeSystemPath {
	return p
}

// ToUnixPath converts from RelativeSystemPath to RelativeUnixPath.
func (p RelativeSystemPath) ToUnixPath() RelativeUnixPath {
	return RelativeUnixPath(filepath.ToSlash(p.ToString()))
}

// Join appends relative path segments to this RelativeSystemPath.
func (p RelativeSystemPath) Join(additional ...RelativeSystemPath) RelativeSystemPath {
	cast := RelativeSystemPathArray(additional)
	return RelativeSystemPath(filepath.Join(p.ToString(), filepath.Join(cast.ToStringArray()...)))
}