var filledDays by mutableStateOf<List<Int>>(emptyList())
    var startDay by mutableStateOf<Int?>(null)
    var endDay by mutableStateOf<Int?>(null)
    var nextEndDay: Boolean = false

    fun fill() {
        var list = filledDays.toMutableList()
        for (i in startDay!!..endDay!!) {
            list.add(i)
        }
        filledDays = list
    }

    fun click(day: Int) {
        if (nextEndDay) {
            if (day > startDay!!) {
                endDay = day
                nextEndDay = false
                fill()
            } else {
                startDay(day)
            }
        } else {
            startDay(day)
        }
    }

    fun startDay(day: Int) {
        startDay = day
        endDay = null
        filledDays = emptyList()
        nextEndDay = true
        squareSpeed = 50
    }