import { useEffect, useRef, useState, type RefObject } from "react";
import { Stage, Layer, Image, Shape } from "react-konva";
import type { KonvaEventObject } from "konva/lib/Node";
import { useCreateVideoSnapshot } from "../../hooks/useGetvideoSnapshots";
import { useCameraFeedContext } from "../../../../app/context/CameraFeedContext";
import { useCameraFeedSocket } from "../../../../app/context/WebSocketContext";
import { ReadyState } from "react-use-websocket";
import { toast } from "sonner";
import type { CameraID } from "../../../../app/config/cameraConfig";

const BACKEND_WIDTH = 640;
const BACKEND_HEIGHT = 360;
const BACKEND_CELL_SIZE = 16;

const rows = 22.5;
const cols = 40;
const gap = 0;

const VideoFeedGridPainter = () => {
  const { state } = useCameraFeedContext();
  const cameraFeedID = state.cameraFeedID;
  const paintedCells = state?.paintedCells?.[cameraFeedID];
  const regions = state.regionsByCamera[cameraFeedID];
  const selectedRegionIndex = state.selectedRegionIndex;
  const mode = state.modeByCamera[cameraFeedID];
  const { latestBitmapRef, isloading } = useCreateVideoSnapshot();
  const [stageSize, setStageSize] = useState({ width: BACKEND_WIDTH, height: BACKEND_HEIGHT });
  const isDrawingRef = useRef(false);
  const [scale, setScale] = useState(1);
  const [position, setPosition] = useState({ x: 0, y: 0 });

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const stageRef = useRef<any>(null);

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const paintLayerRef = useRef<any>(null);

  const currentScale = stageSize.width / BACKEND_WIDTH;
  const size = BACKEND_CELL_SIZE * currentScale;

  const cameraSocket = useCameraFeedSocket();

  const getCurrentSocket = () => {
    switch (cameraFeedID) {
      case "A":
        return cameraSocket;
      case "B":
        return cameraSocket;
      case "C":
        return cameraSocket;
    }
  };

  const handleZoomClick = (e: KonvaEventObject<MouseEvent>, cameraFeedID: CameraID) => {
    if (mode !== "zoom") return;
    const socket = getCurrentSocket();
    const stage = e.target.getStage();
    const coords = stage?.getPointerPosition();
    if (!coords || !socket) return;

    const newX = coords.x / stageSize.width;
    const newY = coords.y / stageSize.height;

    // Check if WebSocket is connected
    if (socket.readyState !== ReadyState.OPEN) {
      toast.error(`Camera ${cameraFeedID} WebSocket is not connected`);
      return;
    }

    try {
      socket.send(`ZOOM=${newX.toFixed(2)},${newY.toFixed(2)}`);
    } catch (error) {
      console.error("WebSocket send error:", error);
      toast.error(`Failed to send command to Camera ${cameraFeedID}`);
    }
  };

  const draw = (bmp: RefObject<ImageBitmap | null>): ImageBitmap | null => {
    if (!bmp || !bmp.current) {
      return null;
    }
    const image = bmp.current;
    return image;
  };

  const image = draw(latestBitmapRef);

  const paintCell = (x: number, y: number) => {
    if (mode === "controller" || mode === "zoom" || mode === "magnify") return;
    const col = Math.floor(x / (size + gap));
    const row = Math.floor(y / (size + gap));

    if (row < 0 || row >= rows || col < 0 || col >= cols) return;

    const activeRegion = regions[selectedRegionIndex];
    if (!activeRegion) return;

    const key = `${row}-${col}`;
    const currentColour = regions[selectedRegionIndex].brushColour;

    const map = paintedCells;
    const existing = map.get(key);

    if (mode === "eraser") {
      if (map.has(key)) {
        map.delete(key);
        paintLayerRef.current?.batchDraw();
      }

      return;
    }

    if (existing && existing.colour === currentColour) return;

    map.set(key, { colour: currentColour, region: activeRegion });

    paintLayerRef.current?.batchDraw();
  };

  const handleStageMouseDown = (e: KonvaEventObject<MouseEvent>) => {
    if (!regions[selectedRegionIndex] || mode === "magnify" || mode === "zoom") return;
    isDrawingRef.current = true;
    const pos = e.target.getStage()?.getPointerPosition();
    if (pos) paintCell(pos.x, pos.y);
  };

  const handleStageMouseMove = (e: KonvaEventObject<MouseEvent>) => {
    if (!isDrawingRef.current || mode === "magnify") return;
    if (!regions[selectedRegionIndex]) return;
    const pos = e.target.getStage()?.getPointerPosition();
    if (pos) paintCell(pos.x, pos.y);
  };

  const handleStageMouseUp = () => {
    isDrawingRef.current = false;
  };

  const handleMouseEnter = () => {
    if (mode !== "magnify") return;
    setScale(2);
  };
  const handleMouseLeave = () => {
    document.body.style.cursor = "default";
    setScale(1);
    setPosition({ x: 0, y: 0 });
  };
  const handleMouseMove = (e: KonvaEventObject<MouseEvent>) => {
    if (scale === 1) return;

    const stage = e.target.getStage();
    if (!stage) return;

    const pointerPosition = stage.getPointerPosition();
    if (!pointerPosition) return;

    const newX = stageSize.width / 2 - pointerPosition.x * scale;
    const newY = stageSize.height / 2 - pointerPosition.y * scale;

    const maxX = 0;
    const minX = stageSize.width - stageSize.width * scale;
    const maxY = 0;
    const minY = stageSize.height - stageSize.height * scale;

    setPosition({
      x: Math.max(minX, Math.min(maxX, newX)),
      y: Math.max(minY, Math.min(maxY, newY)),
    });
  };

  useEffect(() => {
    const handleResize = () => {
      const width = window.innerWidth;

      const aspectRatio = BACKEND_WIDTH / BACKEND_HEIGHT;
      if (width < 768) {
        const newWidth = width * 0.8;
        const newHeight = newWidth / aspectRatio;
        setStageSize({ width: newWidth, height: newHeight });
      } else {
        const newWidth = width * 0.6;
        const newHeight = newWidth / aspectRatio;
        setStageSize({ width: newWidth, height: newHeight });
      }
    };

    handleResize();
    window.addEventListener("resize", handleResize);

    return () => window.removeEventListener("resize", handleResize);
  }, []);

  if (image === null || isloading) return <span className="text-slate-500">Loading Video feed…</span>;
  return (
    <div>
      <Stage
        ref={stageRef}
        width={stageSize.width}
        height={stageSize.height}
        onMouseDown={handleStageMouseDown}
        onMouseMove={handleStageMouseMove}
        onMouseUp={handleStageMouseUp}
        onMouseLeave={handleStageMouseUp}
        className={`max-w-[55%] md:row-span-3 md:col-span-3 ${mode === "painter" ? "hover:cursor-crosshair" : ""} ${
          mode === "eraser" ? "hover:cursor-pointer" : ""
        } ${mode === "zoom" ? "hover:cursor-zoom-in" : ""}`}
      >
        <Layer
          scaleX={scale}
          scaleY={scale}
          onMouseEnter={handleMouseEnter}
          onMouseLeave={handleMouseLeave}
          onMouseMove={handleMouseMove}
          x={position.x}
          y={position.y}
        >
          <Image
            image={image}
            width={stageSize.width}
            height={stageSize.height}
            classname={"rounded-lg"}
            onClick={(e) => handleZoomClick(e, cameraFeedID)}
            cornerRadius={10}
          />
        </Layer>

        <Layer ref={paintLayerRef} opacity={0.6}>
          {mode === "painter" || mode === "eraser" ? (
            <Shape
              sceneFunc={(ctx, shape) => {
                const cells = paintedCells;
                if (!cells || cells.size === 0 || !paintLayerRef.current) return;
                cells?.forEach((cell, key) => {
                  const [rowStr, colStr] = key.split("-");
                  const row = Number(rowStr);
                  const col = Number(colStr);

                  const x = col * (size + gap);
                  const y = row * (size + gap);

                  ctx.beginPath();
                  ctx.rect(x, y, size, size);
                  ctx.fillStyle = cell.colour;
                  ctx.fill();
                });

                ctx.fillStrokeShape(shape);
              }}
              width={stageSize.width}
              height={stageSize.height}
            />
          ) : null}
        </Layer>
      </Stage>
    </div>
  );
};

export default VideoFeedGridPainter;