package ui

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

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

type AddUserData struct {
	User  string
	First string
	Last  string
	Role  string
	Msg   string
}

func inputsEmpty(user, pass, pass2, first, last, role string) bool {
	return len(user) == 0 ||
		len(pass) == 0 ||
		len(pass2) == 0 ||
		len(first) == 0 ||
		len(last) == 0 ||
		len(role) == 0
}

func checkUserStrings(user, first, last string) (string, int, bool) {
	userLen := 15
	nameLen := 50

	if len(user) > userLen {
		return "Benutzername", userLen, false
	} else if len(first) > nameLen {
		return "Vorname", nameLen, false
	} else if len(last) > nameLen {
		return "Nachname", nameLen, false
	} else {
		return "", 0, true
	}
}

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

func AddUser(db *data.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var writer, editor, admin bool

		htmlData := AddUserData{
			User:  r.PostFormValue("username"),
			First: r.PostFormValue("first-name"),
			Last:  r.PostFormValue("last-name"),
			Role:  r.PostFormValue("role"),
		}
		pass := r.PostFormValue("password")
		pass2 := r.PostFormValue("password2")

		if inputsEmpty(htmlData.User, pass, pass2, htmlData.First, htmlData.Last, htmlData.Role) {
			htmlData.Msg = "Alle Felder müssen ausgefüllt werden."
			template.Must(template.ParseFiles("web/templates/add-user.html")).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		userString, stringLen, ok := checkUserStrings(htmlData.User, htmlData.First, htmlData.Last)
		if !ok {
			htmlData.Msg = fmt.Sprint(userString, " ist zu lang. Maximal ", stringLen, " Zeichen erlaubt.")
			template.Must(template.ParseFiles("web/templates/add-user.html")).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		id, _ := db.GetID(htmlData.User)
		if id != 0 {
			htmlData.Msg = fmt.Sprint(htmlData.User, " ist bereits vergeben. Bitte anderen Benutzernamen wählen.")
			template.Must(template.ParseFiles("web/templates/add-user.html")).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		if pass != pass2 {
			htmlData.Msg = "Die Passwörter stimmen nicht überein."
			template.Must(template.ParseFiles("web/templates/add-user.html")).ExecuteTemplate(w, "page-content", htmlData)
			return
		}
		switch htmlData.Role {
		case "writer":
			writer = true
			editor = false
			admin = false
		case "editor":
			writer = false
			editor = true
			admin = false
		case "admin":
			writer = false
			editor = false
			admin = true
		default:
			log.Println("When setting up", htmlData.User, "the HTML was altered.")
			htmlData.Msg = "Das HTML der Seite zu verändern ist unzulässig. Dieser Vorfall wurde gespeichert."
			template.Must(template.ParseFiles("web/templates/add-user.html")).ExecuteTemplate(w, "page-content", htmlData)
			return
		}

		if err := db.AddUser(htmlData.User, pass, htmlData.First, htmlData.Last, writer, editor, admin); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		template.Must(template.ParseFiles("web/templates/hub.html")).ExecuteTemplate(w, "page-content", nil)
	}
}