package main

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

	//"time"

	_ "github.com/mattn/go-sqlite3"
)

//***************************************************************************
//funkcje sterujące
//***************************************************************************

func opisStołówkaZPM(w http.ResponseWriter, r *http.Request) {
	t, _ := template.ParseFiles("StronaGlowna.gtpl")
	t.Execute(w, nil)
}

func panel(w http.ResponseWriter, r *http.Request) {
	//time.Sleep(3 * time.Second)
	//fmt.Println("method:", r.Method)
	//t, _ := template.ParseFiles("panel.gtpl")
	//t.Execute(w, nil)

	//***************************************************************************
	db, err := sql.Open("sqlite3", "stolowkaZPM.db")
	checkErr(err)
	// query
	rows, err := db.Query("SELECT * FROM users")
	checkErr(err)
	var IDusers int
	var User string
	var Password string
	var PIN int
	var RFID int
	fmt.Fprintf(w, "Lista użytkowników:\n")
	for rows.Next() {
		err = rows.Scan(&IDusers, &User, &Password, &PIN, &RFID)
		checkErr(err)
		fmt.Printf("%d.  %s, %s, %d, %d \n", IDusers, User, Password, PIN, RFID)
		fmt.Fprintf(w, "%d. %s \n", IDusers, User)
	}
	rows.Close()
	db.Close()
	//***************************************************************************
}

func login(w http.ResponseWriter, r *http.Request) {
	//Here:
	fmt.Println("method:", r.Method)
	if r.Method == "GET" {
		t, _ := template.ParseFiles("login.gtpl")
		t.Execute(w, nil)
	} else {
		r.ParseForm()
		//fmt.Println("usernameFROMsite: ", r.Form["usernameFROMsite"])
		//fmt.Println("passwordFROMsite: ", r.Form["passwordFROMsite"])
		//if len(r.Form["usernameFROMsite"][0]) == 0 {
		//	goto Here
		//}
		//if len(r.Form["passwordFROMsite"][0]) == 0 {
		//	goto Here
		//}
	}
	usernameFROMsite := r.FormValue("usernameFROMsite")
	passwordFROMsite := r.FormValue("passwordFROMsite")
	zaloguj := "Zalogowano!"

	//***************************************************************************
	db, err := sql.Open("sqlite3", "stolowkaZPM.db")
	checkErr(err)
	// query
	rows, err := db.Query("SELECT * FROM users")
	checkErr(err)
	var IDusers int
	var User string
	var Password string
	var PIN int
	var RFID int

	for rows.Next() {
		err = rows.Scan(&IDusers, &User, &Password, &PIN, &RFID)
		checkErr(err)
		//fmt.Printf("%d.  %s, %s, %d, %d \n", IDusers, User, Password, PIN, RFID)
		//fmt.Fprint(w, IDusers)
		//fmt.Fprint(w, ".  ")
		//fmt.Fprint(w, User)
		//fmt.Fprint(w, " \n")
		if r.Method == "POST" {
			if User == usernameFROMsite {
				if Password == passwordFROMsite {
					fmt.Fprintln(w, zaloguj)
					fmt.Fprintln(w, usernameFROMsite)
					//panel(w, r)
					break
				}
			}
		}
	}
	if r.Method == "POST" {
		if usernameFROMsite != User {
			t, _ := template.ParseFiles("login.gtpl")
			t.Execute(w, nil)
			fmt.Fprint(w, "***  UWAGA!  ***  Błąd logowania!  ***  Spróbuj ponownie.  ***")
		}
	}
	rows.Close()
	db.Close()
	//***************************************************************************
}

//***************************************************************************
//Bazy danych SQlite
//***************************************************************************

func checkErr(err error) {
	if err != nil {
		fmt.Println("Błąd")
	}
}

//***************************************************************************
//funkcja główna
//***************************************************************************
func main() {
	http.HandleFunc("/", opisStołówkaZPM)
	http.HandleFunc("/login", login)
	http.HandleFunc("/panel", panel)
	err := http.ListenAndServe(":9197", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}