import React, { useState, useRef, FC } from "react";
import ReactCrop, { Crop, PixelCrop } from "react-image-crop";
import { Box, Button, Modal, Slider, Typography, useMediaQuery, useTheme } from "@mui/material";

import { canvasPreview } from "./utils/canvasPreview";
import { useDebounceEffect } from "./utils/useDebounceEffect";

import { ResetIcon } from "@icons/ResetIcon";

import "react-image-crop/dist/ReactCrop.css";

interface Iprops {
  opened: boolean;
  onClose: React.Dispatch<React.SetStateAction<boolean>>;
}

export const CropModal2: FC<Iprops> = ({ opened, onClose }) => {
  const [imgSrc, setImgSrc] = useState("");
  const imgRef = useRef<HTMLImageElement>(null);
  const fileInputRef = useRef<HTMLInputElement>(null);
  const previewCanvasRef = useRef<HTMLCanvasElement>(null);
  const hiddenAnchorRef = useRef<HTMLAnchorElement>(null);
  const blobUrlRef = useRef("");
  const [crop, setCrop] = useState<Crop>();
  const [completedCrop, setCompletedCrop] = useState<PixelCrop>();
  const [rotate, setRotate] = useState(0);
  const [imageSize, setImageSize] = useState(580);
  const [darken, setDarken] = useState(0);

  const theme = useTheme();
  const isMobile = useMediaQuery(theme.breakpoints.down(786));

  const style = {
    position: "absolute",
    top: "50%",
    left: "50%",
    transform: "translate(-50%, -50%)",
    width: isMobile ? "343px" : "620px",
    bgcolor: "background.paper",
    boxShadow: 24,
    padding: "20px",
    borderRadius: "8px",
  };

  const styleSlider = {
    width: isMobile ? "350px" : "250px",
    color: "#7E2AEA",
    height: "12px",
    "& .MuiSlider-track": {
      border: "none",
    },
    "& .MuiSlider-rail": {
      backgroundColor: "#F2F3F7",
      border: `1px solid "#9A9AAF"`,
    },
    "& .MuiSlider-thumb": {
      height: 26,
      width: 26,
      border: `6px solid #7E2AEA`,
      backgroundColor: "white",
      boxShadow: `0px 0px 0px 3px white,
                    0px 4px 4px 3px #C3C8DD`,
      "&:focus, &:hover, &.Mui-active, &.Mui-focusVisible": {
        boxShadow: `0px 0px 0px 3px white,
                        0px 4px 4px 3px #C3C8DD`,
      },
    },
  };

  const rotateImage = () => {
    const newRotation = (rotate + 90) % 360;
    setRotate(newRotation);
  };

  const onSelectFile = (event: React.ChangeEvent<HTMLInputElement>) => {
    if (event.target.files && event.target.files.length > 0) {
      setCrop(undefined);
      const reader = new FileReader();
      reader.addEventListener("load", () => setImgSrc(reader.result?.toString() || ""));
      reader.readAsDataURL(event.target.files[0]);
    }
  };

  const onDownloadCropClick = () => {
    if (!previewCanvasRef.current) {
      throw new Error("Crop canvas does not exist");
    }

    const canvasCopy = document.createElement("canvas");
    const ctx = canvasCopy.getContext("2d");
    canvasCopy.width = previewCanvasRef.current.width;
    canvasCopy.height = previewCanvasRef.current.height;
    ctx!.filter = `brightness(${100 - darken}%)`;
    ctx!.drawImage(previewCanvasRef.current, 0, 0);

    canvasCopy.toBlob((blob) => {
      if (!blob) {
        throw new Error("Failed to create blob");
      }
      if (blobUrlRef.current) {
        URL.revokeObjectURL(blobUrlRef.current);
      }
      blobUrlRef.current = URL.createObjectURL(blob);
      hiddenAnchorRef.current!.href = blobUrlRef.current;
      hiddenAnchorRef.current!.click();
    });
  };

  useDebounceEffect(
    async () => {
      if (completedCrop?.width && completedCrop?.height && imgRef.current && previewCanvasRef.current) {
        canvasPreview(imgRef.current, previewCanvasRef.current, completedCrop, rotate);
      }
    },
    100,
    [completedCrop, rotate]
  );

  return (
    <>
      {completedCrop && (
        <div>
          <canvas
            ref={previewCanvasRef}
            style={{
              display: "none",
              zIndex: "-999",
              border: "1px solid black",
              objectFit: "contain",
              width: completedCrop.width,
              height: completedCrop.height,
            }}
          />
        </div>
      )}
      <div>
        <a
          href="#hidden"
          ref={hiddenAnchorRef}
          download
          style={{
            display: "none",
          }}
        >
          Hidden download
        </a>
      </div>
      <Modal
        open={opened}
        onClose={onClose}
        aria-labelledby="modal-modal-title"
        aria-describedby="modal-modal-description"
      >
        <Box sx={style}>
          <Box
            sx={{
              height: "320px",
              padding: "10px",
              backgroundSize: "cover",
              backgroundRepeat: "no-repeat",

              display: "flex",
              alignItems: "center",
              justifyContent: "center",
            }}
          >
            {!!imgSrc && (
              <ReactCrop
                crop={crop}
                onChange={(_, percentCrop) => setCrop(percentCrop)}
                onComplete={(c) => setCompletedCrop(c)}
                maxWidth={500}
                maxHeight={320}
              >
                <img
                  ref={imgRef}
                  alt="Crop me"
                  src={imgSrc}
                  style={{
                    filter: `brightness(${100 - darken}%)`,
                    transform: ` rotate(${rotate}deg)`,
                    maxWidth: "580px",
                    maxHeight: "320px",
                  }}
                  width={580 * (imageSize / 200)}
                />
              </ReactCrop>
            )}
          </Box>

          <Box
            sx={{
              color: "#7E2AEA",
              display: "flex",
              alignItems: "center",
              justifyContent: "center",
              fontSize: "16xp",
              fontWeight: "600",
              marginBottom: "50px",
            }}
          >
            <Typography sx={{ color: "#7E2AEA", lineHeight: "0px" }}>
              {crop?.width ? Math.round(crop.width) + "px" : ""}
            </Typography>
            <Typography sx={{ color: "#7E2AEA", lineHeight: "0px" }}>
              {crop?.width ? Math.round(crop.width) + "px" : ""}
            </Typography>
          </Box>

          <Box sx={{ display: isMobile ? "block" : "flex", alignItems: "end", justifyContent: "space-between" }}>
            <ResetIcon onClick={rotateImage} style={{ marginBottom: "10px", cursor: "pointer" }} />
            <Box>
              <Typography sx={{ color: "#9A9AAF", fontSize: "16px" }}>Размер</Typography>
              <Slider
                sx={styleSlider}
                value={imageSize}
                min={50}
                max={200}
                step={1}
                onChange={(_, newValue) => {
                  setImageSize(newValue as number);
                }}
              />
            </Box>
            <Box>
              <Typography sx={{ color: "#9A9AAF", fontSize: "16px" }}>Затемнение</Typography>
              <Slider
                sx={styleSlider}
                value={darken}
                min={0}
                max={100}
                step={1}
                onChange={(_, newValue) => setDarken(newValue as number)}
              />
            </Box>
          </Box>
          <Box sx={{ marginTop: "40px", width: "100%", display: "flex", justifyContent: "end" }}>
            <input
              style={{ display: "none", zIndex: "-999" }}
              ref={fileInputRef}
              type="file"
              accept="image/*"
              onChange={onSelectFile}
            />
            <Button
              onClick={() => fileInputRef.current?.click()}
              disableRipple
              sx={{
                width: "215px",
                height: "48px",
                color: "#7E2AEA",
                borderRadius: "8px",
                border: "1px solid #7E2AEA",
                marginRight: "10px",
              }}
            >
              Загрузить оригинал
            </Button>
            <Button
              onClick={onDownloadCropClick}
              disableRipple
              sx={{
                width: "149px",
                height: "48px",
                color: "white",
                background: "#7E2AEA",
                borderRadius: "8px",
              }}
            >
              Обрезать
            </Button>
          </Box>
        </Box>
      </Modal>
    </>
  );
};