//calculate mins and seconds from milliseconds to show in the screen
fun minuteCalc(data: Long): String {
        var data = data

        val min: Long
        val sec: Long
        data /= 1000

        if (maxTimer < data) {
            maxTimer = data
            progressBar.max = maxTimer.toFloat()
        }

        if (data > 60) {
            min = data / 60
            sec = data % 60
            return "Timer: " + min + "m " + sec + "s"
        } else {
            sec = data
            return "Timer: " + sec + "s"
        }

    }

    fun preTimerText() {
        timerText!!.text = minuteCalc(timer)
    }

    fun startTimer(v: View) {
        timer()
    }

    fun stopTimer(v: View) {
        if (timerFunction != null) {
            timerFunction!!.cancel()
        }
        progressBar.progress = 0f
        progressBar.max = 60000f
        timer = 60000
        maxTimer = 60000
        timerText!!.text = "Cancelled"
        handler.postDelayed({ preTimerText() }, 3000)
    }

    fun timer() {

        timerOn = true

        timerFunction = object : CountDownTimer(timer, 1000) {

            override fun onTick(millisUntilFinished: Long) {
                timerText!!.text = minuteCalc(millisUntilFinished)
                progressBar.progress = (millisUntilFinished / 1000).toFloat()
                timer = millisUntilFinished
            }

            override fun onFinish() {
                timerText!!.text = "done!"
                progressBar.progress = 0f
                timerOn = false
            }

        }.start()
    }

    //add 30s in the timer
    fun add30(v: View) {
        if (timerFunction != null) {
            timerFunction!!.cancel()
        }
        timer += 30000
        progressBar.max = progressBar.max + 30
        if (!timerOn) {
            preTimerText()
        } else {
            timer()
        }
    }

    //add 1min in the timer
    fun add1m(v: View) {
        if (timerFunction != null) {
            timerFunction!!.cancel()
        }
        timer += 60000
        progressBar.max = progressBar.max + 60
        if (!timerOn) {
            preTimerText()
        } else {
            timer()
        }
    }

    //add 5m in the timer
    fun add5m(v: View) {
        if (timerFunction != null) {
            timerFunction!!.cancel()
        }
        timer += 300000
        progressBar.max = progressBar.max + 300
        if (!timerOn) {
            preTimerText()
        } else {
            timer()
        }
    }