package main

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

func showRegisterForm(w http.ResponseWriter, r *http.Request) {
	t, err := template.ParseFiles("tmpl/register.html")
	if err != nil {
		panic(err)
	}

	t.Execute(w, nil)
}

func showLoginForm(w http.ResponseWriter, r *http.Request) {
	t, err := template.ParseFiles("tmpl/login.html")
	if err != nil {
		panic(err)
	}

	t.Execute(w, nil)
}

func showPage(w http.ResponseWriter, tmpl string, loggedIn bool, data interface{}) error {
	t, err := template.ParseFiles("tmpl/base.html", "tmpl/"+tmpl+".html")
	if err != nil {
		return err
	}

	_ = t.Execute(w, struct {
		LoggedIn bool
		Data     interface{}
	}{
		LoggedIn: loggedIn,
		Data:     data,
	})

	return nil
}

type wasmcloudHandler func(http.ResponseWriter, *http.Request, *User)

func makeHandler(wantAuth bool, fn wasmcloudHandler) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cookie, err := r.Cookie("wasmcloud-token")
		if err != nil {
			if wantAuth {
				http.Redirect(w, r, "/login", http.StatusSeeOther)
				return
			}

			fn(w, r, nil)
			return
		}

		u, _, err := getUserAndToken(cookie.Value)
		if err != nil {
			http.Redirect(w, r, "/login", http.StatusSeeOther)
			return
		}

		fn(w, r, &u)
	}
}

func authenticatedShowAPage(name string) http.HandlerFunc {
	return makeHandler(true, func(w http.ResponseWriter, r *http.Request, u *User) {
		showPage(w, name, true, u)
	})
}

func unauthenticatedShowAPage(name string) http.HandlerFunc {
	return makeHandler(false, func(w http.ResponseWriter, r *http.Request, u *User) {
		loggedIn := u != nil

		showPage(w, name, loggedIn, u)
	})
}