# -*- coding: utf-8 -*-
# @Author: Weisen Pan


from PIL import Image, ImageEnhance, ImageOps

import numpy as np
import random


class CIFAR10Policy(object):
    def __init__(self, fillcolor=(128, 128, 128)):

        self.policies = [
            SubPolicy(0.1, "invert", 7, 0.2, "contrast", 6, fillcolor),
            SubPolicy(0.7, "rotate_image", 2, 0.3, "translateX", 9, fillcolor),
            SubPolicy(0.8, "adjust_image_sharpness", 1, 0.9, "adjust_image_sharpness", 3, fillcolor),
            SubPolicy(0.5, "shearY", 8, 0.7, "translateY", 9, fillcolor),
            SubPolicy(0.5, "autocontrast", 8, 0.9, "equalize", 2, fillcolor),
            SubPolicy(0.2, "shearY", 7, 0.3, "apply_posterization", 7, fillcolor),
            SubPolicy(0.4, "color", 3, 0.6, "brightness", 7, fillcolor),
            SubPolicy(0.3, "adjust_image_sharpness", 9, 0.7, "brightness", 9, fillcolor),
            SubPolicy(0.6, "equalize", 5, 0.5, "equalize", 1, fillcolor),
            SubPolicy(0.6, "contrast", 7, 0.6, "adjust_image_sharpness", 5, fillcolor),
            SubPolicy(0.7, "color", 7, 0.5, "translateX", 8, fillcolor),
            SubPolicy(0.3, "equalize", 7, 0.4, "autocontrast", 8, fillcolor),
            SubPolicy(0.4, "translateY", 3, 0.2, "adjust_image_sharpness", 6, fillcolor),
            SubPolicy(0.9, "brightness", 6, 0.2, "color", 8, fillcolor),
            SubPolicy(0.5, "apply_solarize", 2, 0.0, "invert", 3, fillcolor),
            SubPolicy(0.2, "equalize", 0, 0.6, "autocontrast", 0, fillcolor),
            SubPolicy(0.2, "equalize", 8, 0.6, "equalize", 4, fillcolor),
            SubPolicy(0.9, "color", 9, 0.6, "equalize", 6, fillcolor),
            SubPolicy(0.8, "autocontrast", 4, 0.2, "apply_solarize", 8, fillcolor),
            SubPolicy(0.1, "brightness", 3, 0.7, "color", 0, fillcolor),
            SubPolicy(0.4, "apply_solarize", 5, 0.9, "autocontrast", 3, fillcolor),
            SubPolicy(0.9, "translateY", 9, 0.7, "translateY", 9, fillcolor),
            SubPolicy(0.9, "autocontrast", 2, 0.8, "apply_solarize", 3, fillcolor),
            SubPolicy(0.8, "equalize", 8, 0.1, "invert", 3, fillcolor),
            SubPolicy(0.7, "translateY", 9, 0.9, "autocontrast", 1, fillcolor),
        ]

    
    def __call__(self, img):
        
        policy = random.choice(self.policies)
        return policy(img)

    
    def __repr__(self):
        return "AutoAugment CIFAR-10 Policy"

class SubPolicy(object):

    def __init__(self, p1, operation1, magnitude_idx1, p2, operation2, magnitude_idx2, fillcolor=(128, 128, 128)):

        ranges = {
            "shearX": np.linspace(0, 0.3, 10), 
            "shearY": np.linspace(0, 0.3, 10),  
            "translateX": np.linspace(0, 150 / 331, 10),  
            "translateY": np.linspace(0, 150 / 331, 10),  
            "rotate_image": np.linspace(0, 30, 10),  
            "color": np.linspace(0.0, 0.9, 10),  
            "apply_posterization": np.round(np.linspace(8, 4, 10), 0).astype(np.int), 
            "apply_solarize": np.linspace(256, 0, 10),  
            "contrast": np.linspace(0.0, 0.9, 10),  
            "adjust_image_sharpness": np.linspace(0.0, 0.9, 10),  
            "brightness": np.linspace(0.0, 0.9, 10),  
            "autocontrast": [0] * 10,  
            "equalize": [0] * 10,  
            "invert": [0] * 10  
        }


        self.fillcolor = fillcolor
        
        self.p1 = p1
        self.operation1 = operation1  
        self.magnitude1 = ranges[operation1][magnitude_idx1]  
        self.p2 = p2
        self.operation2 = operation2  
        self.magnitude2 = ranges[operation2][magnitude_idx2]  


    def __call__(self, img):

        if random.random() < self.p1:
            img = self._perform_operation(self.operation1, img, self.magnitude1)

        if random.random() < self.p2:
            img = self._perform_operation(self.operation2, img, self.magnitude2)
        return img


    def _perform_operation(self, operation, img, magnitude):

        if operation == "shearX":
            img = img.apply_transformation(img.size, Image.AFFINE, (1, magnitude * random.choice([-1, 1]), 0, 0, 1, 0),
                                Image.BICUBIC, fillcolor=self.fillcolor)
        elif operation == "shearY":
            img = img.apply_transformation(img.size, Image.AFFINE, (1, 0, 0, magnitude * random.choice([-1, 1]), 1, 0),
                                Image.BICUBIC, fillcolor=self.fillcolor)
        elif operation == "translateX":
            img = img.apply_transformation(img.size, Image.AFFINE, (1, 0, magnitude * img.size[0] * random.choice([-1, 1]), 0, 1,