#!/usr/bin/env python3

import sys
import random
import math
import argparse
import collections
import blup.frame
import blup.output
import blup.animation
import blup.writebml
import colorsys


WIDTH = 22
HEIGHT = 16
DEPTH = 256


class Point(collections.namedtuple('Point', ['x', 'y'])):
    def __add__(self, other):
        return Point(self.x + other.x, self.y + other.y)
    def __sub__(self, other):
        return Point(self.x - other.x, self.y - other.y)
    def __mul__(self, other):
        if isinstance(other, Point):
            raise Exception('not implemented')
        else:
            return Point(self.x * other, self.y * other)
    def __truediv__(self, other):
        if isinstance(other, Point):
            raise ValueError()
        else:
            return self * (1/other)
    @property
    def len(self):
        return math.sqrt(self.x**2 + self.y**2)
    @property
    def n(self):
        n = Point(self.y, -self.x)
        return n / n.len
    @property
    def intp(self):
        return Point(int(round(self.x)), int(round(self.y)))


def convert_color(c):
    return list(map(lambda x: int(round(x*(DEPTH-1))), c))


def get_random_color():
    return colorsys.hsv_to_rgb(random.random(), 1, 1)


class Disc:
    def __init__(self, worldsize, hue):
        self.worldsize = worldsize
        self.pos = Point(random.randint(0, worldsize.x - 1),
                         random.randint(0, worldsize.y - 1))
        self.hue = hue
        self.r = 1
        self.speed = min(worldsize.x, worldsize.y) / 2
        self.done = False

    def update(self, t, dt):
        self.r += self.speed * dt
        if self.r > max(self.worldsize.x, self.worldsize.y):
            self.done = True

    def draw(self, frame):
        color = colorsys.hsv_to_rgb(self.hue, 1, 1)
        for x in range(self.worldsize.x):
            for y in range(self.worldsize.y):
                p = Point(x, y)
                if (p - self.pos).len < self.r:
                    frame.setPixel(p.x, p.y, convert_color(color))


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Generate animations')
    parser.add_argument('-d', '--delay', type=int, default=50)
    parser.add_argument('-t', '--time', type=int, default=15)
    parser.add_argument('output_file')
    args = parser.parse_args()

    dim = blup.frame.FrameDimension(WIDTH, HEIGHT, DEPTH, 3)
    anim = blup.animation.Animation(dim)
    anim.tags['description'] = ' '.join(sys.argv)

    discs = []
    t = 0
    dt = args.delay / 1000
    while t < args.time:
        t += dt
        frame = blup.animation.AnimationFrame(dim, args.delay)

        if len(discs) == 0 or discs[-1].r > min(WIDTH, HEIGHT) / 2:
            hue = random.random()
            if len(discs) > 0:
                l = lambda d: hue - d.hue if d.hue < hue else d.hue - hue
                while not 0.2 < sorted(map(l, discs))[0] < 0.8:
                    hue = random.random()
            discs.append(Disc(Point(WIDTH, HEIGHT), hue))

        for d in discs:
            d.update(t, dt)
            d.draw(frame)

        if len(discs) > 2 and discs[0].done and discs[1].done:
            del discs[0]

        anim.addFrame(frame)

    blup.writebml.writeBml(anim, args.output_file)