#!/usr/bin/env python3

# ----------------------------------------------------------------------------
# "THE BEER-WARE LICENSE" (Revision 42):
# <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
# you can do whatever you want with this stuff. If we meet some day, and you
# think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
# ----------------------------------------------------------------------------

import time
import random

class GameOfLife:
    def __init__(self, g, f = 20, c1 = (255, 255, 255), c2 = (0, 0, 0), t = 20.0):
        self.gui = g
        self.interval = 1.0 / f
        self.setColors(c1, c2)
        self.timeout = t
        random.seed()
        self.restart()

    def restart(self):
        self.data = self.init()
        self.start = time.time()
        self.last = time.time()
        self.done = False

    def setColors(self, c1, c2):
        self.colorFG = c1
        self.colorBG = c2

    def init(self):
        data = []
        for x in range(0, self.gui.width):
            d = []
            for y in range(0, self.gui.height):
                v = False
                if random.randrange(0, 2) == 1:
                    v = True

                d.append(v)
            data.append(d)
        return data

    def finished(self):
        if self.done or ((time.time() - self.start) > self.timeout):
            return True
        return False

    def alive(self, data, x, y):
        if (x < 0) or (y < 0) or (x >= self.gui.width) or (y >= self.gui.height):
            return False
        return data[x][y]

    def live_neighbours(self, data, x, y):
        c = 0
        for xOff in range(-1, 2):
            for yOff in range(-1, 2):
                if (xOff == 0) and (yOff == 0):
                    continue
                if self.alive(data, x + xOff, y + yOff):
                    c += 1
        return c

    def step(self):
        # deep copy
        old = [x[:] for x in self.data]

        for x in range(0, self.gui.width):
            for y in range(0, self.gui.height):
                ln = self.live_neighbours(old, x, y)
                if old[x][y] and ((ln == 2) or (ln == 3)):
                    # Any live cell with two or three live neighbours survives.
                    self.data[x][y] = True
                elif (not old[x][y]) and (ln == 3):
                    # Any dead cell with three live neighbours becomes a live cell.
                    self.data[x][y] = True
                else:
                    # All other live cells die in the next generation. Similarly, all other dead cells stay dead.
                    self.data[x][y] = False

        # compare new and old states
        same = True
        for x in range(0, self.gui.width):
            for y in range(0, self.gui.height):
                if self.data[x][y] != old[x][y]:
                    same = False
                    break
        self.done = same

    def draw(self):
        if (time.time() - self.last) > self.interval:
            self.last = time.time()
            self.step()

        for x in range(0, self.gui.width):
            for y in range(0, self.gui.height):
                if self.data[x][y]:
                    self.gui.set_pixel(x, y, self.colorFG)
                else:
                    self.gui.set_pixel(x, y, self.colorBG)

if __name__ == "__main__":
    import platform
    t = None
    if platform.machine() == "armv7l":
        from pi import PiMatrix
        t = PiMatrix()
    else:
        from test import TestGUI
        t = TestGUI()

    g = GameOfLife(t)

    def helperRestart():
        c = (random.randrange(0, 256), random.randrange(0, 256), random.randrange(0, 256))
        g.setColors(c, (0, 0, 0))

    # start out with random colors
    helperRestart()

    def helper():
        if g.finished():
            g.restart()
            helperRestart()
        g.draw()

    t.debug_loop(helper)