import asyncio
from typing import Any, cast

import cv2
import numpy as np
import PIL.Image

from konabot.common.path import ASSETS_PATH

cao_image = PIL.Image.open(ASSETS_PATH / "img" / "meme" / "caoimg1.png")
CAO_QUAD_POINTS = np.float32(cast(Any, [
    [392, 540],
    [577, 557],
    [567, 707],
    [381, 687],
]))

def _draw_cao_display(image: PIL.Image.Image):
    src = np.array(image.convert("RGB"))
    h, w = src.shape[:2]
    src_points = np.float32(cast(Any, [
        [0, 0],
        [w, 0],
        [w, h],
        [0, h]
    ]))
    dst_points = CAO_QUAD_POINTS
    M = cv2.getPerspectiveTransform(cast(Any, src_points), cast(Any, dst_points))
    output_size = cao_image.size
    output_w, output_h = output_size
    warped = cv2.warpPerspective(
        src,
        M,
        (output_w, output_h),
        flags=cv2.INTER_LINEAR,
        borderMode=cv2.BORDER_CONSTANT,
        borderValue=(0, 0, 0)
    )
    result = PIL.Image.fromarray(warped, 'RGB').convert('RGBA')
    result = PIL.Image.alpha_composite(result, cao_image)
    return result


async def draw_cao_display(image: PIL.Image.Image):
    return await asyncio.to_thread(_draw_cao_display, image)