package ui

import (
	"fmt"
	"html/template"
	"log"
	"net/http"
	"strconv"

	"streifling.com/jason/cpolis/cmd/data"
)

type AddUserData struct {
	*data.User
	Msg string
}

func inputsEmpty(user *data.User, pass, pass2 string) bool {
	return len(user.UserName) == 0 ||
		len(user.FirstName) == 0 ||
		len(user.LastName) == 0 ||
		len(pass) == 0 ||
		len(pass2) == 0
}

func checkUserStrings(user *data.User) (string, int, bool) {
	userLen := 15
	nameLen := 50

	if len(user.UserName) > userLen {
		return "Benutzername", userLen, false
	} else if len(user.FirstName) > nameLen {
		return "Vorname", nameLen, false
	} else if len(user.LastName) > nameLen {
		return "Nachname", nameLen, false
	} else {
		return "", 0, true
	}
}

func CreateUser(w http.ResponseWriter, r *http.Request) {
	tmpl, err := template.ParseFiles("web/templates/add-user.html")
	template.Must(tmpl, err).ExecuteTemplate(w, "page-content", nil)
}

func AddUser(db *data.DB, s *data.CookieStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		role, err := strconv.Atoi(r.PostFormValue("role"))
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		htmlData := AddUserData{
			User: &data.User{
				UserName:  r.PostFormValue("username"),
				FirstName: r.PostFormValue("first-name"),
				LastName:  r.PostFormValue("last-name"),
				Role:      role,
			},
		}
		pass := r.PostFormValue("password")
		pass2 := r.PostFormValue("password2")

		if inputsEmpty(htmlData.User, pass, pass2) {
			htmlData.Msg = "Alle Felder müssen ausgefüllt werden."
			tmpl, err := template.ParseFiles("web/templates/add-user.html")
			template.Must(tmpl, err).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		userString, stringLen, ok := checkUserStrings(htmlData.User)
		if !ok {
			htmlData.Msg = fmt.Sprint(userString, " ist zu lang. Maximal ",
				stringLen, " Zeichen erlaubt.")
			tmpl, err := template.ParseFiles("web/templates/add-user.html")
			template.Must(tmpl, err).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		id, _ := db.GetID(htmlData.UserName)
		if id != 0 {
			htmlData.Msg = fmt.Sprint(htmlData.UserName,
				" ist bereits vergeben. Bitte anderen Benutzernamen wählen.")
			tmpl, err := template.ParseFiles("web/templates/add-user.html")
			template.Must(tmpl, err).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		if pass != pass2 {
			htmlData.Msg = "Die Passwörter stimmen nicht überein."
			tmpl, err := template.ParseFiles("web/templates/add-user.html")
			template.Must(tmpl, err).ExecuteTemplate(w, "page-content", htmlData)
			return
		}

		num, err := db.CountEntries()
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		if num == 0 {
			if htmlData.Role != data.Admin {
				htmlData.Msg = "Der erste Benutzer muss ein Administrator sein."
				htmlData.Role = data.Admin
				tmpl, err := template.ParseFiles("web/templates/add-user.html")
				tmpl = template.Must(tmpl, err)
				tmpl.ExecuteTemplate(w, "page-content", htmlData)
				return
			}

			if err := saveSession(w, r, s, htmlData.User); err != nil {
				log.Println(err)
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}
		}

		if err := db.AddUser(htmlData.User, pass); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		tmpl, err := template.ParseFiles("web/templates/hub.html")
		template.Must(tmpl, err).ExecuteTemplate(w, "page-content", 0)
	}
}