#!/usr/bin/env python3

from argparse import ArgumentParser
from bresenham import bresenham
from PIL import Image, ImageDraw
from random import randint
import sys


rand = lambda: randint(0,200)


def print_stats(img):
	pixels = img.getdata()
	count = sum([1 for i in pixels if i == 0])
	print("{} black pixels over {} ({:.1%})".format(count, len(pixels), count/len(pixels)))


def get_lines(img):
	lines = []
	pixels = [(x, y) for x in range(img.width) for y in range(img.height) if img.getpixel((x, y)) == 0]

	i, n = 0, len(pixels) * len(pixels)

	print("Get lines:", end = "")
	for a in pixels:
		for b in pixels:
			line = list(bresenham(a[0], a[1], b[0], b[1]))
			r = len([0 for p in line if p not in pixels])
			if not r:
				lines.append(line)
			i += 1
			print("\rGet lines: {:.0%}".format(i / n), end = "")
	print("\rGet lines: complete")

	print("{} lines found".format(len(lines)))
	return lines


def removing_doubles(lines):
	results = []
	i, n = 0, len(lines)

	print("Remove duplicated lines:", end = "")
	for l in lines:
		s = sorted(l)
		same = False
		for o in results:
			if sorted(o) == s:
				same = True
				break
		if same == False:
			results.append(l)
		i += 1
		print("\rRemove double lines: {:.0%}".format(i / n), end = "")
	print("\rRemove double lines: complete")

	print("{} lines kept".format(len(results)))
	return results


def removing_useless(lines):
	results = []
	i, n = 0, len(lines)

	print("Remove useless lines:", end = "")
	for l in lines:
		inclusions = 0
		others = (x for x in lines if x != l)
		for k in others:
			if len(list(set(l).intersection(set(k)))) == len(l):
				inclusions += 1
				break
		if inclusions == 0 or len(l) == 1:
			results.append((len(l), l))
		i += 1
		print("\rRemove useless lines: {:.0%}".format(i / n), end = "")
	print("\rRemove useless lines: complete")

	print("{} lines kept".format(len(results)))
	return results


def get_best_solution(img, lines):
	px_left = [(x, y) for x in range(img.width) for y in range(img.height) if img.getpixel((x, y)) == 0]
	results = []
	n = len(px_left)

	print("Draw:", end = "")
	while len(px_left):
		lines = [(sum([1 for p in l if p in px_left]) - len(l)/(2*max(img.size)), l) for n, l in lines]
		lines = sorted(lines)
		(p, line) = lines.pop()
		px_left = [p for p in px_left if p not in line]
		results.append((line[0], line[-1]))
		print("\rDraw: {:.0%}".format(1 - len(px_left)/n), end="")
	print("\rDraw: complete")

	print("Solution found in {} lines".format(len(results)))
	return results


def generate_code(lines, args):
	str_x, str_y = "{", "{"

	for (xa, yb), (x, y) in lines:
		x, y = x + int(args.offset[0]), y + int(args.offset[1])
		a, b = xa - x + int(args.offset[0]), yb - y + int(args.offset[1])
		str_x += "{}{:+}{}, ".format(x, a, "T" if a else "")
		str_y += "{}{:+}{}, ".format(y, b, "T" if b else "")

	str_x = str_x[:-2] + "}"
	str_y = str_y[:-2] + "}"
	return "Graph(X,Y)=({}, {})".format(str_x, str_y)


if __name__ == "__main__":
	parser = ArgumentParser(description='Generate the Multi DrawStat code for an image.')
	parser.add_argument('path', type=str, help='path of the image to process')
	parser.add_argument('-d', '--draw', action='store_true', help='draw the result into a new file and display it')
	parser.add_argument('-o', '--offset', nargs=2, default=(0, 0), help='offset for viewwindow. Default: (0, 0)')
	# parser.add_argument('-q', '--quiet', action='store_true', help='return code only')
	# parser.add_argument('-r', '--reverse', action='store_true', help='reverse y axis')

	args = parser.parse_args()

	try:
		image = Image.open(args.path)
	except:
		sys.exit("Error! Unable to open file.")

	try:
		image = image.convert('1')
	except:
		sys.exit("Error! Unable to convert to 1bit")

	print_stats(image)
	lines = get_lines(image)
	lines = removing_doubles(lines)
	lines = removing_useless(lines)
	lines = get_best_solution(image, lines)
	code = generate_code(lines, args)

	if args.draw:
		export = Image.new('RGB', image.size, 'white')
		drawer = ImageDraw.Draw(export)
		for ((a, b), (c, d)) in reversed(lines):
			drawer.line((a, b, c, d), fill=(rand(), rand(), rand()))
		export = export.resize((export.width * 8, export.height * 8))
		export.save(args.path[:-4] + "_gen.png")
		export.show()

	print("\n\n=================================================\n\n")

	print(code)

	print("\n\n=================================================\n\nDone!")