import cv2
import numpy as np
from PIL import Image

from .builder import ITEMS
from .clothing import Clothing
from ..utils.conversion_image import rgb_to_rgba
from ..utils.upload_image import upload_png_mask
from ...utils.generate_uuid import generate_uuid


@ITEMS.register_module()
class Shoes(Clothing):
    # TODO location of shoes has little mismatch
    def __init__(self, **kwargs):
        pipeline = [
            dict(type='LoadImageFromFile', path=kwargs['path'], color=kwargs['color']),
            dict(type='KeypointDetection'),
            dict(type='ContourDetection'),
            dict(type='Painting'),
            dict(type='Scaling'),
            dict(type='Split'),
            # dict(type='ImageShow', key=['image', 'mask', 'pattern_image']),
        ]
        kwargs.update(pipeline=pipeline)
        super(Shoes, self).__init__(**kwargs)

    def organize(self, layer):
        left_shoe_mask, right_shoe_mask = self.cut()

        left_layer = dict(name=f'{type(self).__name__.lower()}_left',
                          image=self.result['shoes_left'],
                          image_url=self.result['left_image_url'],
                          mask_url=self.result['left_mask_url'],
                          sacle=self.result['scale'],
                          clothes_keypoint=self.result['clothes_keypoint'],
                          position=self.calculate_start_point(self.result['keypoint'],
                                                              self.result['scale'],
                                                              self.result['clothes_keypoint'],
                                                              self.result['body_point'],
                                                              'left'))
        layer.insert(left_layer)

        right_layer = dict(name=f'{type(self).__name__.lower()}_right',
                           image=self.result['shoes_right'],
                           image_url=self.result['right_image_url'],
                           mask_url=self.result['right_mask_url'],
                           sacle=self.result['scale'],
                           clothes_keypoint=self.result['clothes_keypoint'],
                           position=self.calculate_start_point(self.result['keypoint'],
                                                               self.result['scale'],
                                                               self.result['clothes_keypoint'],
                                                               self.result['body_point'],
                                                               'right'))

        layer.insert(right_layer)

    def cut(self):
        """
        Cut shoes mask into two pieces
        Returns:
        """
        contour, _ = cv2.findContours(self.result['mask'], cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
        contours = sorted(contour, key=cv2.contourArea, reverse=True)

        bounding_boxes = [cv2.boundingRect(c) for c in contours[:2]]
        (contours, bounding_boxes) = zip(*sorted(zip(contours[:2], bounding_boxes), key=lambda x: x[1][0], reverse=False))

        epsilon_left = 0.001 * cv2.arcLength(contours[0], True)

        approx_left = cv2.approxPolyDP(contours[0], epsilon_left, True)
        mask_left = np.zeros(self.result['final_image'].shape[:2], np.uint8)
        cv2.drawContours(mask_left, [approx_left], -1, 255, -1)
        item_mask_left = cv2.GaussianBlur(mask_left, (5, 5), 0)

        rgba_image = rgb_to_rgba((self.result['final_image'].shape[0], self.result['final_image'].shape[1]), self.result['final_image'], item_mask_left)
        result_image = np.zeros_like(rgba_image)
        result_image[self.result['front_mask'] != 0] = rgba_image[self.result['front_mask'] != 0]
        result_left_image_pil = Image.fromarray(result_image, 'RGBA')
        result_left_image_pil = result_left_image_pil.resize((int(result_left_image_pil.width * self.result["scale"]), int(result_left_image_pil.height * self.result["scale"])), Image.LANCZOS)
        self.result['shoes_left'], self.result["left_image_url"], self.result["left_mask_url"] = upload_png_mask(result_left_image_pil, f"{generate_uuid()}")

        epsilon_right = 0.001 * cv2.arcLength(contours[1], True)
        approx_right = cv2.approxPolyDP(contours[1], epsilon_right, True)
        mask_right = np.zeros(self.result['final_image'].shape[:2], np.uint8)
        cv2.drawContours(mask_right, [approx_right], -1, 255, -1)
        item_mask_right = cv2.GaussianBlur(mask_right, (5, 5), 0)

        rgba_image = rgb_to_rgba((self.result['final_image'].shape[0], self.result['final_image'].shape[1]), self.result['final_image'], item_mask_right)
        result_image = np.zeros_like(rgba_image)
        result_image[self.result['front_mask'] != 0] = rgba_image[self.result['front_mask'] != 0]
        result_right_image_pil = Image.fromarray(result_image, 'RGBA')
        result_right_image_pil = result_right_image_pil.resize((int(result_right_image_pil.width * self.result["scale"]), int(result_right_image_pil.height * self.result["scale"])), Image.LANCZOS)
        self.result['shoes_right'], self.result["right_image_url"], self.result["right_mask_url"] = upload_png_mask(result_right_image_pil, f"{generate_uuid()}")

        return item_mask_left, item_mask_right

    @staticmethod
    def calculate_start_point(keypoint_type, scale, clothes_point, body_point, location):
        """
        left shoes align left
        right shoes align right
        Args:
            keypoint_type: string, "toe"
            scale: float
            clothes_point: dict{'left': [x1, y1, z1], 'right': [x2, y2, z2]}
            body_point: dict, containing keypoint data of body figure
            location: string, indicates whether the start point belongs to right or left shoe

        Returns:
            start_point: tuple (x', y')
            x' = y_body - y1 * scale
            y' = x_body - x1 * scale
        """
        if location not in ['left', 'right']:
            raise KeyError(f'location value must be left or right but got {location}')
        side_indicator = f'{keypoint_type}_{location}'
        # clothes_point = {k: tuple(map(lambda x: int(scale * x), v[0: 2])) for k, v in clothes_point.items()}
        start_point = (body_point[side_indicator][1] - int(int(clothes_point[side_indicator].split("_")[1]) * scale),
                       body_point[side_indicator][0] - int(int(clothes_point[side_indicator].split("_")[0]) * scale))
        return start_point