#!/usr/bin/env python
import os
import random
import argparse
import numpy as np
from PIL import Image
from pathlib import Path
from skimage import color
from tqdm.auto import tqdm


from lib.lime import LIME
from lib.fog_gen import fogAttenuation
from lib.snow_gen import SnowGenUsingNoise
from lib.gen_utils import (
    screen_blend,
    layer_blend,
    illumination2opacity,
    reduce_lightHSV,
    scale_depth,
)


def parse_arguments():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--clear_path", type=str, required=True, help="path to the file or the folder"
    )
    parser.add_argument(
        "--depth_path", type=str, required=True, help="path to the file or the folder"
    )
    parser.add_argument(
        "--save_folder", type=str, default="./generated/", help="path to the folder"
    )
    parser.add_argument("--txt_file", default=None, help="path to the folder")
    parser.add_argument("--show", action="store_true")
    parser.add_argument("--fog", action="store_true")

    return parser.parse_args()


class SnowEffectGenerator:
    def __init__(self, fog=True):
        self._lime = LIME(iterations=25, alpha=1.0)
        # self._illumination2darkness = {0: 1, 1: 0.75, 2: 0.65, 3: 0.5}
        self._illumination2darkness = {0: 1, 1: 0.9, 2: 0.8, 3: 0.7}
        self._weather2visibility = (1000, 2500)  # (500, 1000)
        # self._illumination2fogcolor = {0: (80, 120), 1: (120, 160), 2: (160, 200), 3: (200, 240)}
        self._illumination2fogcolor = {
            0: (150, 180),
            1: (180, 200),
            2: (200, 240),
            3: (200, 240),
        }
        self._snow_layer_gen = SnowGenUsingNoise()
        self._fog = fog

    def getIlluminationMap(self, img: np.ndarray) -> np.ndarray:
        self._lime.load(img)
        T = self._lime.illumMap()
        return T

    def getIlluminationMapCheat(self, img: np.ndarray) -> np.ndarray:
        T = color.rgb2gray(img)
        return T

    def genSnowLayer(self, h=720, w=1280):  # alpha,
        num_itr_small = 2  # random.randint(1,3)
        num_itr_large = 1  # random.randint(1,4)
        blur_angle = random.choice([-1, 1]) * random.randint(60, 90)
        layer_small = self._snow_layer_gen.genSnowMultiLayer(
            h=720,
            w=1280,
            blur_angle=blur_angle,
            intensity="small",
            num_itr=num_itr_small,
        )  # small

        layer_large = self._snow_layer_gen.genSnowMultiLayer(
            h=720,
            w=1280,
            blur_angle=blur_angle,
            intensity="large",
            num_itr=num_itr_large,
        )  # large
        layer = layer_blend(layer_small, layer_large)
        hl, wl = layer.shape

        if h != hl or w != wl:
            layer = np.asarray(Image.fromarray(layer).resize((w, h)))
        return layer  # (layer.astype(float)*alpha).astype(np.uint8)

    def genEffect(self, img_path: str, depth_path: str):
        I = np.array(Image.open(img_path))
        D = np.load(depth_path)

        return self.genEffect_(I, D)

    def genEffect_(self, I, D):
        hI, wI, _ = I.shape
        hD, wD = D.shape

        if hI != hD or wI != wD:
            D = scale_depth(D, hI, wI)

        T = self.getIlluminationMapCheat(I)
        illumination_array = np.histogram(T, bins=4, range=(0, 1))[0] / (T.size)
        illumination = illumination_array.argmax()

        if self._fog:
            if illumination > 0:
                visibility = random.randint(
                    self._weather2visibility[0], self._weather2visibility[1]
                )
                fog_color = random.randint(
                    self._illumination2fogcolor[illumination][0],
                    self._illumination2fogcolor[illumination][1],
                )
                I_dark = reduce_lightHSV(
                    I,
                    sat_red=self._illumination2darkness[illumination],
                    val_red=self._illumination2darkness[illumination],
                )
                I_fog = fogAttenuation(
                    I_dark, D, visibility=visibility, fog_color=fog_color
                )
            else:
                fog_color = 75
                visibility = D.max() * 0.75 if D.max() < 1000 else 750
                I_fog = fogAttenuation(I, D, visibility=visibility, fog_color=fog_color)
        else:
            I_fog = I

        snow_layer = self.genSnowLayer(h=hI, w=wI)  # , alpha=alpha) #, alpha
        I_snow = screen_blend(
            I_fog, snow_layer
        )  # screen_blend(I_fog, snow_layer) , alpha
        return I_snow.astype(np.uint8)


def main():
    args = parse_arguments()
    snowgen = SnowEffectGenerator(fog=args.fog)

    clearP = Path(args.clear_path)
    depthP = Path(args.depth_path)
    if clearP.is_file() and (depthP.is_file() and depthP.suffix == ".npy"):
        snowy = snowgen.genEffect(clearP, depthP)
        if args.show:
            Image.fromarray(snowy).show()

    if clearP.is_dir() and depthP.is_dir():
        if args.txt_file:
            with open(args.txt_file, "r") as f:
                files = f.read().split("\n")
            image_files = [clearP / f for f in files]
        else:
            image_files = sorted(Path(clearP).glob("*"))

        depth_files = [
            Path(depthP) / (imgf.name.split(".")[0] + ".npy") for imgf in image_files
        ]

        valid_files = [idx for idx, f in enumerate(depth_files) if f.exists()]
        image_files = [image_files[idx] for idx in valid_files]
        depth_files = [depth_files[idx] for idx in valid_files]

        save_folder = Path(args.save_folder)
        if not save_folder.exists():
            os.makedirs(str(save_folder))

        for imgp, depthp in tqdm(zip(image_files, depth_files), total=len(image_files)):
            snowy = snowgen.genEffect(imgp, depthp)
            Image.fromarray(snowy).save(save_folder / (imgp.stem + ".jpg"))


if __name__ == "__main__":
    main()