from rpi_ws281x import PixelStrip
import atexit
from tkinter import Tk, Canvas
from threading import Thread


class _LedData(object):
    _led: []

    def __init__(self, channel, size):
        self.size = size
        self.channel = channel

    def __getitem__(self, pos):
        """Return the 24-bit RGB color value at the provided position or slice
        of positions.
        """
        # Handle if a slice of positions are passed in by grabbing all the values
        # and returning them in a list.
        if isinstance(pos, slice):
            return [self._led[n] for n in range(*pos.indices(self.size))]
        # Else assume the passed in value is a number to the position.
        else:
            return self._led[pos]

    def __setitem__(self, pos, value):
        """Set the 24-bit RGB color value at the provided position or slice of
        positions.
        """
        # Handle if a slice of positions are passed in by setting the appropriate
        # LED data values to the provided values.
        if isinstance(pos, slice):
            index = 0
            for n in range(*pos.indices(self.size)):
                self._led[n] = value[index]
                index += 1
            # Else assume the passed in value is a number to the position.
            # else:
            self._led[pos] = value


class FakeStrip(PixelStrip):
    _brightness: int

    def __init__(self, num, pin, freq_hz=800000, dma=10, invert=False,
                 brightness=255, channel=0, strip_type=None, gamma=None):

        if gamma is None:
            # Support gamma in place of strip_type for back-compat with
            # previous version of forked library
            if type(strip_type) is list and len(strip_type) == 256:
                gamma = strip_type
                # strip_type = None
            else:
                gamma = list(range(256))

        # Initialize the channel in use
        self._channel = None
        self._gamma = gamma
        self._brightness = brightness

        # Grab the led data array.
        self._led_data = _LedData(self._channel, num)

        # Substitute for __del__, traps an exit condition and cleans up properly
        atexit.register(self._cleanup)

        self.viz = Tk()
        self.x = 1000
        self.y = 500
        self.viz.geometry(f'{self.x}x{self.y}')
        self.canv = Canvas(self.viz)
        self.canv.pack(expand=1)
        self.th.start()
        self.th = Thread(target=self.viz.mainloop)

    def _cleanup(self):
        # Clean up memory used by the library when not needed anymore.
        if self._channel is not None:
            self._channel = None

    def setGamma(self, gamma):
        if type(gamma) is list and len(gamma) == 256:
            self._gamma = gamma

    def begin(self):
        """Initialize library, must be called once before other functions are called."""
        return

    def show(self):
        """Update the display with the data from the LED buffer."""
        self.canv.delete("all")
        size = 10.5
        bp = [47, 97, 191, 242, 289]
        for s in range(self.numPixels()):
            x1 = 0
            y1 = 0
            x2 = 0
            y2 = 0

            if s < bp[0]:
                x1 = (self.x / 2) + s * size
                y1 = 0
                x2 = x1 + size
                y2 = size
            elif s < bp[1]:
                x1 = self.x - size
                y1 = -(bp[0] - s) * size
                x2 = x1 + size
                y2 = y1 + size
            elif s < bp[2]:
                x1 = self.x + (bp[1] - s) * size
                y1 = self.y
                x2 = x1 - size
                y2 = y1 - size
            elif s < bp[3]:
                x1 = 0
                y1 = self.y + (bp[2] - s) * size
                x2 = x1 + size
                y2 = y1 - size
            elif s < bp[4]:
                x1 = size * - (bp[3] - s)
                y1 = 0
                x2 = x1 + size
                y2 = y1 + size

            rgb = self.getPixelColorRGB(s)
            self.canv.create_rectangle(x1, y1, x2, y2, fill="#%02x%02x%02x" % (rgb.r, rgb.g, rgb.b))

    def getBrightness(self) -> int:
        return self._brightness

    def setBrightness(self, brightness: int):
        """Scale each LED in the buffer by the provided brightness.
        A brightness of 0 is the darkest and 255 is the brightest.
        """
        self._brightness = brightness

    def numPixels(self):
        """Return the number of pixels in the display."""
        return self._led_data.size