from random import random, choice
from PIL import Image, ImageFilter
from functools import reduce

import argparse
import os

def color_ramp(white=(255, 255, 255), black=(0, 0, 0)):
    wr, wg, wb = white
    br, bg, bb = black

    colors = [[br + (wr - br) * i / 255, bg + (wg - bg) * i / 255, bb + (wb - bb) * i / 255] for i in range(255)]

    return list(map(int, reduce(list.__add__, colors)))


sepia = color_ramp((255 - int(random()*25), 230 + int(random()*25), 179+int(random()*25)))

decals = [os.path.join("decals", f) for f in os.listdir("decals") if os.path.isfile(os.path.join("decals", f))]


def clamp(x, value, y):
    return max(x, min(value, y))


def add_decal(image, decal):
    decal = Image.open(decal)
    w, h = image.size

    scale = .5 + random()
    scale = scale * min(w/decal.size[0], 1)

    decal = decal.rotate(random() * 360, expand=True)
    decal = decal.resize(map(int, (scale * decal.size[0], scale * decal.size[1])), Image.ANTIALIAS)

    dw, dh = decal.size
    pos = tuple(map(int, (random() * w - .5 * dw, random() * h - .5 * dh)))

    image.paste(decal, pos, decal)


def add_noise(image, level):
    data = image.getdata()

    def noise(t):
        w = int(random() * 255 * level)
        r, g, b, a = t

        return clamp(0, r - w, 255), clamp(0, g - w, 255), clamp(0, b - w, 255), a

    data = list(map(noise, data))
    image.putdata(data)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Damages image")
    parser.add_argument('input', help='Image to damage', type=str)
    parser.add_argument('output', help='Output image name', type=str, nargs='?')
    parser.add_argument('damaged', help='Output damaged image name', type=str, nargs='?')

    parser.add_argument('-d', help='Decals count', type=int, default=8, dest="decals")
    parser.add_argument('-n', help='Noise level', type=float, default=.4, dest="noise")

    args = parser.parse_args()

    if args.output is None:
        dir, name = os.path.split(args.input)
        args.output = os.path.join(dir, "ok_" + name)

    if args.damaged is None:
        dir, name = os.path.split(args.input)
        args.damaged = os.path.join(dir, "damaged_" + name)

    im = Image.open(args.input)
    im = im.convert("L")
    im.putpalette(sepia)
    im = im.convert("RGBA")

    im.convert("RGB").save(args.output)
    add_noise(im, args.noise)
    for _ in range(args.decals):
        add_decal(im, choice(decals))

    im = im.filter(ImageFilter.GaussianBlur(1.5))
    im.convert("RGB").save(args.damaged)