from datetime import datetime


class TimeDisplay:

    def __init__(self, characterDisplay, topRow):
        self.currentHour = [-1, -1]
        self.currentMinute = [-1, -1]
        self.characterDisplay = characterDisplay
        self.topRow = topRow
        self.hourStartColumn = -1
        self.timeDotsColumn = 7
        self.minuteStartColumn = 9

        self.characterDisplay.displayTimeDots(self.timeDotsColumn, self.topRow)

    def showTime(self):
        self.showHour(self.getHourDigits())
        self.showMinute(self.getMinuteDigits())

    def showHour(self, hour):
        if hour[0] != self.currentHour[0]:
            self.currentHour[0] = hour[0]

            if hour[0] == 0:
                self.characterDisplay.clearNumberPixels(
                    self.hourStartColumn,
                    self.topRow
                )
            else:
                self.characterDisplay.displayNumber(
                    self.hourStartColumn,
                    self.topRow,
                    hour[0]
                )

        if hour[1] != self.currentHour[1]:
            self.currentHour[1] = hour[1]
            self.characterDisplay.displayNumber(
                self.hourStartColumn + 4,
                self.topRow,
                hour[1]
            )

    def showMinute(self, minute):
        if minute[0] != self.currentMinute[0]:
            self.currentMinute[0] = minute[0]
            self.characterDisplay.displayNumber(
                self.minuteStartColumn,
                self.topRow,
                minute[0]
            )

        if minute[1] != self.currentMinute[1]:
            self.currentMinute[1] = minute[1]
            self.characterDisplay.displayNumber(
                self.minuteStartColumn + 4,
                self.topRow,
                minute[1]
            )

    def getHourDigits(self):
        return self.getTimeDigits('%l')

    def getMinuteDigits(self):
        return self.getTimeDigits('%M')

    def getTimeDigits(self, format):
        digits = datetime.now().strftime(format).strip().rjust(2, '0')

        return [int(x) for x in digits]