package endpoints

import (
	"arbeitszeitmessung/helper"
	"arbeitszeitmessung/models"
	"arbeitszeitmessung/templates"
	"context"
	"log"
	"net/http"
	"strconv"
	"time"

	"github.com/alexedwards/scs/v2"
)

var Session *scs.SessionManager

func CreateSessionManager(lifetime time.Duration) *scs.SessionManager {
	Session = scs.New()
	Session.Lifetime = lifetime
	return Session
}

func LoginHandler(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		showLoginPage(w, r, false)
		break
	case http.MethodPost:
		loginUser(w, r)
		break
	default:
		http.Error(w, "Method not allowed!", http.StatusMethodNotAllowed)
		break
	}
}

func showLoginPage(w http.ResponseWriter, r *http.Request, failed bool) {
	r = r.WithContext(context.WithValue(r.Context(), "session", Session))
	if helper.GetEnv("GO_ENV", "production") == "debug" {
		// http.Redirect(w, r, "/time", http.StatusSeeOther)
		templates.LoginPage(failed).Render(r.Context(), w)
	}
	if Session.Exists(r.Context(), "user") {
		http.Redirect(w, r, "/time", http.StatusSeeOther)
	}
	templates.LoginPage(failed).Render(r.Context(), w)
}

func loginUser(w http.ResponseWriter, r *http.Request) {
	err := r.ParseForm()
	if err != nil {
		log.Println("Error parsing form!", err)
		http.Error(w, "Internal error", http.StatusBadRequest)
		return
	}
	_personal_nummer := r.FormValue("personal_nummer")
	if _personal_nummer == "" {
		log.Println("No personal_nummer provided!")
		http.Error(w, "No personal_nummer provided", http.StatusBadRequest)
		return
	}
	personal_nummer, err := strconv.Atoi(_personal_nummer)
	if err != nil {
		log.Println("Cannot parse personal nubmer!")
		http.Error(w, "Cannot parse number", http.StatusBadRequest)
		return
	}

	user, err := (*models.User).GetByPersonalNummer(nil, personal_nummer)
	if err != nil {
		log.Println("No user found under this personal number!")
		http.Error(w, "No user found!", http.StatusNotFound)
	}

	password := r.FormValue("password")
	if user.Login(password) {
		log.Printf("New succesfull user login from %s %s!\n", user.Vorname, user.Name)
		Session.Put(r.Context(), "user", user.PersonalNummer)
		http.Redirect(w, r, "/time", http.StatusSeeOther) //with this browser always uses GET
	} else {
		showLoginPage(w, r, true)
		return
	}
	showLoginPage(w, r, false)
	return
}