import colors

from datetime import datetime


class TimeDisplay:

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

    def showTime(self):
        self.showHour(self.getHourDigits())
        self.showTimeDots()
        self.showMinute(self.getMinuteDigits())
        self.currentColor = self.color

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

            if hour[0] == '0':
                self.hideDigit(self.hourStartColumn)
            else:
                self.showDigit(self.hourStartColumn, hour[0])

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

    def showTimeDots(self):
        if self.color != self.currentColor:
            self.characterDisplay.displayTimeDots(
                x=self.timeDotsColumn,
                y=self.topRow,
                color=self.color
            )

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

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

    def showDigit(self, x, digit):
        self.characterDisplay.displayDigit(
            x=x,
            y=self.topRow,
            digit=digit,
            color=self.color
        )

    def hideDigit(self, x):
        self.characterDisplay.clearDigit(
            x=x,
            y=self.topRow
        )

    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 list(digits)