# copyright (c) 2024 PaddlePaddle Authors. All Rights Reserve.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import math
import random
from pathlib import Path
import numpy as np
import cv2
import PIL
from PIL import Image, ImageDraw, ImageFont
from ....utils.fonts import PINGFANG_FONT_FILE_PATH, create_font
from ...common.result import BaseCVResult


class DocPreprocessorResult(BaseCVResult):
    """doc preprocessor result"""

    def save_to_img(self, save_path: str, *args, **kwargs) -> None:
        """
        Save the image to the specified path.

        Args:
            save_path (str): The path to save the image.
                If the path does not end with '.jpg' or '.png', it appends '_res_doc_preprocess_<img_id>.jpg'
                to the path where <img_id> is retrieved from the object's 'img_id' attribute.
            *args: Variable length argument list.
            **kwargs: Arbitrary keyword arguments.

        Returns:
            None
        """
        if not str(save_path).lower().endswith((".jpg", ".png")):
            img_id = self["img_id"]
            save_path = Path(save_path) / f"res_doc_preprocess_{img_id}.jpg"
        super().save_to_img(save_path, *args, **kwargs)

    def _to_img(self) -> PIL.Image:
        """
        Generate an image combining the original, rotated, and unwarping images.

        Returns:
            PIL.Image: A new image that displays the original, rotated, and unwarping images side by side.
        """
        image = self["input_image"][:, :, ::-1]
        angle = self["angle"]
        rot_img = self["rot_img"][:, :, ::-1]
        output_img = self["output_img"][:, :, ::-1]
        h1, w1 = image.shape[0:2]
        h2, w2 = rot_img.shape[0:2]
        h3, w3 = output_img.shape[0:2]
        h = max(max(h1, h2), h3)
        img_show = Image.new("RGB", (w1 + w2 + w3, h + 25), (255, 255, 255))
        img_show.paste(Image.fromarray(image), (0, 0, w1, h1))
        img_show.paste(Image.fromarray(rot_img), (w1, 0, w1 + w2, h2))
        img_show.paste(Image.fromarray(output_img), (w1 + w2, 0, w1 + w2 + w3, h3))

        draw_text = ImageDraw.Draw(img_show)
        txt_list = ["Original Image", "Rotated Image", "Unwarping Image"]
        region_w_list = [w1, w2, w3]
        beg_w_list = [0, w1, w1 + w2]
        for tno in range(len(txt_list)):
            txt = txt_list[tno]
            font = create_font(txt, (region_w_list[tno], 20), PINGFANG_FONT_FILE_PATH)
            draw_text.text(
                [10 + beg_w_list[tno], h + 2], txt, fill=(0, 0, 0), font=font
            )
        return img_show