package main

import (
	"errors"
	"html/template"
	"net/http"
	"net/url"
)

var testTemplate *template.Template

type ViewData struct {
	User User
}

type User struct {
	ID    int
	Email string
	URL   string
}

func main() {
	var err error
	testTemplate, err = template.New("hello.gohtml").Funcs(template.FuncMap{
		"getToken":  TemplateToken,
		"getAction": TemplateAction,
		"hasPermission": func(user User, feature string) bool {
			if user.ID == 1 && feature == "feature-a" {
				return true
			}
			return false
		},
	}).ParseFiles("hello.gohtml")
	if err != nil {
		panic(err)
	}

	http.HandleFunc("/", handler)
	http.ListenAndServe(":3000", nil)
}

func handler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html")

	user := User{
		ID:    1,
		Email: "jon@calhoun.io",
		URL:   "https://cloud.dev8.on-premise.ru/shared/incoming/?token=oG9Z9Ej9k6hhNu2R2U9MZz9undYTuDstbsaTxQSLA7ZDPM5XY5iDnzm79S8x7gSi&action=accept",
	}
	vd := ViewData{user}
	err := testTemplate.Execute(w, vd)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

var (
	errNoToken = errors.New("no_token")
)

func TemplateToken(uri string) (string, error) {
	str, err := url.Parse(uri)
	if err != nil {
		return "", err
	}
	token := str.Query().Get("token")
	if token == "" {
		return "", errNoToken
	}
	return token, nil

}
func TemplateAction(uri string) (string, error) {
	str, err := url.Parse(uri)
	if err != nil {
		return "", err
	}
	token := str.Query().Get("action")
	if token == "" {
		return "", err
	}
	return token, nil
}