package menus

import (
	"net/url"

	"go.sebtobie.de/httpserver/auth"
)

// Rauth is an type to idenitfy the need of the handlers.
type Rauth int

//
const (
	ReqAuthAbsent   Rauth = -1
	ReqAuthUnspec   Rauth = 0
	ReqAuthRequired Rauth = 1
)

var rauthmap = map[Rauth]string{
	ReqAuthAbsent:   "Authentication Absent",
	ReqAuthRequired: "Authentication Required",
	ReqAuthUnspec:   "Authentication irrelevant",
}

// String is to Statisfy the Stringer interface
func (r *Rauth) String() string {
	return rauthmap[*r]
}

// Menu is an Interface to give the server infos about menuitems
type Menu interface {
	Name() string
	AltText() string
	URL() *url.URL
	Children() []Menu
	Enabled(auth.Account) bool
}

// MenuSite is an interface that is fullfilled by sites to return an type of menu.
type MenuSite interface {
	Menu(string) []Menu
}

// MenuItem is an Implementation of the Menu Interface
// Enabled returns always true
type MenuItem struct {
	ItemName     string
	ItemAltText  string
	ItemURL      *url.URL
	ItemChildren []Menu
	RequireAuth  Rauth
}

// Name returns the name of the Item.
func (m *MenuItem) Name() string {
	return m.ItemName
}

// AltText is for hovertext or Descriptions. Its can return "".
// to make templatemaking easier i decided to make an return required.
func (m *MenuItem) AltText() string {
	return m.ItemAltText
}

// URL returns the full URL of the item.
func (m *MenuItem) URL() *url.URL {
	return m.ItemURL
}

// Children returns the ItemChildren or an empty Menu-Arry if ItemChildren is nil
func (m *MenuItem) Children() []Menu {
	if m.ItemChildren == nil {
		return []Menu{}
	}
	return m.ItemChildren
}

// Enabled returns always true
func (m *MenuItem) Enabled(a auth.Account) bool {
	switch m.RequireAuth {
	case ReqAuthUnspec:
		return true
	case ReqAuthAbsent:
		return true && a.Anonymous()
	case ReqAuthRequired:
		return true && !a.Anonymous()
	}
	return false
}

var _ Menu = &MenuItem{}