import Factory from "../util/Factory.js";
import Konva from "konva";
import HttpService from "../net/HttpService.js";
import { zoomStage } from "../util/zoomStage.js";

export class MapBuilder {
  constructor(containerId) {
    this.container = document.getElementById(containerId);
    this.stage = new Konva.Stage({
      container: containerId,
      width: this.container.clientWidth,
      height: this.container.clientHeight,
    });

    // TODO AKO DRAGNIT NEKOJ OD POCETOK NA STAGE POZICIIVE KE SA ZEZNAT
    // TODO jwt vo cookie
    // TODO placed shape i mouseMoveHandler da ne callback ( da ne vrakjat funkcija)

    this.gridLayer = new Konva.Layer();
    this.mainLayer = new Konva.Layer();
    this.dragLayer = new Konva.Layer();
    this.infoPinLayer = new Konva.Layer();
    this.textLayer = new Konva.Layer();
    this.gridLayer.listening(false);

    this.originalWidth = this.container.clientWidth;
    this.originalHeight = this.container.clientHeight;

    this.shapes = [];
    this.blockSize = 10;
    this.efficientDrawingMode = false;
    this.roomTypes = [];

    this.gridLine = new Konva.Line({
      points: [],
      stroke: "grey",
      strokeWidth: 1,
      opacity: 0.3,
    });

    this.gridLine.cache();

    this.mainTransformer = new Konva.Transformer({
      centeredScaling: false,
      rotationSnaps: [0, 90, 180, 270],
      anchorSize: 5,
      padding: 2,
      anchorFill: "#ef7539",
      borderStroke: "black",
      anchorStroke: "black",
      cornerRadius: 20,
      anchorCornerRadius: 10,
      anchorDragBoundFunc: this.transformerSnapFunc(),
    });

    this.selectionRectangle = new Konva.Rect({
      fill: "rgba(200,0,255,0.5)",
      visible: false,
      listening: false,
      zIndex: 100,
    });

    this.x1 = 0;
    this.y1 = 0;
    this.x2 = 0;
    this.y2 = 0;

    this.selecting = false;

    this.initialize();
  }

  initialize() {
    this.drawGrid();
    this.mainLayer.add(this.mainTransformer);
    this.mainLayer.add(this.selectionRectangle);
    this.stage.add(this.gridLayer);
    this.stage.add(this.dragLayer);
    this.stage.add(this.mainLayer);
    this.stage.add(this.infoPinLayer);
    this.stage.add(this.textLayer);
    this.setupEventListeners();
  }

  setupEventListeners() {
    document.getElementById("shapeOptions").addEventListener("click", this.selectShape.bind(this));
    document.getElementById("render-button").addEventListener("click", this.render.bind(this));
    window.addEventListener("keydown", this.handleExitSelection.bind(this));
    window.addEventListener("keydown", this.handleDelete.bind(this));
    window.addEventListener("keydown", this.rotateShapesBy90Deg.bind(this));
    window.addEventListener("keydown", this.toggleEfficientDrawingMode.bind(this));
    window.addEventListener("resize", this.handleResize.bind(this));
    this.stage.on("mousedown touchstart", this.handleMouseDown.bind(this));
    this.stage.on("mousemove touchmove", this.handleMouseMove.bind(this));
    this.stage.on("mouseup touchend", this.handleMouseUp.bind(this));
    this.stage.on("click tap", this.handleStageClick.bind(this));
    this.stage.on("contextmenu", this.placeInfoPin.bind(this));
    this.stage.on("dragmove", this.dragStage.bind(this));
    this.stage.on("wheel", this.zoom.bind(this));
  }

  detachKeyPressEventListeners() {
    window.removeEventListener("keydown", this.handleExitSelection.bind(this));
    window.removeEventListener("keydown", this.handleDelete.bind(this));
    window.removeEventListener("keydown", this.rotateShapesBy90Deg.bind(this));
    window.removeEventListener("keydown", this.toggleEfficientDrawingMode.bind(this));
  }
  attachKeyPressEventListeners() {
    window.addEventListener("keydown", this.handleExitSelection.bind(this));
    window.addEventListener("keydown", this.handleDelete.bind(this));
    window.addEventListener("keydown", this.rotateShapesBy90Deg.bind(this));
    window.addEventListener("keydown", this.toggleEfficientDrawingMode.bind(this));
  }

  dragStage(e) {
    if (!e.evt.shiftKey) return;
    this.drawGrid();
  }

  transformerSnapFunc() {
    return (oldPos, newPos) => {
      const snapDistance = 8;

      if (this.mainTransformer.getActiveAnchor() === "rotater") {
        return newPos;
      }

      const distance = Math.sqrt(Math.pow(newPos.x - oldPos.x, 2) + Math.pow(newPos.y - oldPos.y, 2));

      if (distance > snapDistance) {
        return newPos;
      }

      const nextX = Math.round(newPos.x / this.blockSize) * this.blockSize;
      const diffX = Math.abs(newPos.x - nextX);

      const nextY = Math.round(newPos.y / this.blockSize) * this.blockSize;
      const diffY = Math.abs(newPos.y - nextY);

      const snapToX = diffX < snapDistance;
      const snapToY = diffY < snapDistance;

      if (snapToX && !snapToY) {
        return {
          x: nextX,
          y: oldPos.y,
        };
      } else if (!snapToX && snapToY) {
        return {
          x: oldPos.x,
          y: nextY,
        };
      } else if (snapToX && snapToY) {
        return {
          x: nextX,
          y: nextY,
        };
      }

      return newPos;
    };
  }

  handleResize() {
    this.stage.width(this.container.offsetWidth);
    this.stage.height(this.container.offsetHeight);
    this.drawGrid();
  }

  zoom(e) {
   zoomStage(e,this.stage);
   this.drawGrid();
  }

  drawGrid() {
    this.gridLayer.destroyChildren();

    let width = this.stage.width();
    let height = this.stage.height();

    //presmetka od globalen koordinaten sistem vo lokalen na canvasot
    let transform = this.stage.getAbsoluteTransform().copy().invert();
    let topLeft = transform.point({
      x: 0,
      y: 0,
    });

    let bottomRight = transform.point({
      x: width,
      y: height,
    });

    let startX = Math.floor(topLeft.x / this.blockSize) * this.blockSize;
    let startY = Math.floor(topLeft.y / this.blockSize) * this.blockSize;

    let endX = Math.ceil(bottomRight.x / this.blockSize) * this.blockSize;
    let endY = Math.ceil(bottomRight.y / this.blockSize) * this.blockSize;

    for (let x = startX; x <= endX; x += this.blockSize) {
      let line = this.gridLine.clone({
        points: [x + 0.5, topLeft.y - this.blockSize, x + 0.5, bottomRight.y + this.blockSize],
      });

      line.transformsEnabled("position");
      line.perfectDrawEnabled(false);
      line.shadowForStrokeEnabled(false);

      this.gridLayer.add(line);
    }

    for (let y = startY; y <= endY; y += this.blockSize) {
      let line = this.gridLine.clone({
        points: [topLeft.x - this.blockSize, y + 0.5, bottomRight.x + this.blockSize, y + 0.5],
      });

      line.perfectDrawEnabled(false);
      line.shadowForStrokeEnabled(false);
      line.transformsEnabled("position");
      this.gridLayer.add(line);
    }

    this.mainLayer.moveToTop();
    this.infoPinLayer.moveToTop();

    this.gridLayer.batchDraw();
  }

  placeInfoPin(e) {
    e.evt.preventDefault();
    let mousePos = this.stage.getRelativePointerPosition();
    let infoPin = Factory.createShape("InfoPin", mousePos, this.blockSize, this.mainLayer, 0,1,1,true);
    this.addModalHandling(infoPin);
    this.shapes.push(infoPin);
    this.mainLayer.add(infoPin)
    infoPin.displayName(this.textLayer);
    console.log(infoPin.name());
  }

  toggleEfficientDrawingMode(e) {
    if (e.key === "e" || e.key === "E") {
      this.efficientDrawingMode = !this.efficientDrawingMode;
      console.log("EFFICIENT DRAWING MODE is: ", this.efficientDrawingMode);

      if (!this.efficientDrawingMode) {
        this.stopDrawing();
      }
    }
  }

  placeShape() {
    const mousePos = this.stage.getRelativePointerPosition();
    const placedObj = Factory.createShape(
      this.hoverObj.type,
      mousePos,
      this.blockSize,
      this.mainLayer,
      this.hoverObj.rotation(),
        1,
        1,
        true
    );

    if (!placedObj) return;

    this.mainLayer.add(placedObj);
    this.shapes.push(placedObj);
    this.addModalHandling(placedObj);
    this.mainLayer.draw();
    placedObj.displayName(this.textLayer);
    placedObj.snapToGrid();

    if (!this.efficientDrawingMode) {
      this.stopDrawing();
    }
  }

  stopDrawing() {
    this.mainTransformer.nodes([]);
    this.hoverObj.remove();
    this.dragLayer.removeChildren();
    this.stage.off("mousemove", this.boundMouseMoveHandler);
    this.stage.off("click", this.boundPlaceShapeHandler);
  }

  mouseMoveHandler() {
    const mousePos = this.stage.getRelativePointerPosition();
    this.hoverObj.position({ x: mousePos.x, y: mousePos.y });
    this.hoverObj.visible(true);
  }

  startDrawing(shapeType) {
    let pos = { x: 0, y: 0 };
    this.hoverObj = Factory.createShape(shapeType, pos, this.blockSize, this.dragLayer, 0);

    this.hoverObj.visible(false);
    this.dragLayer.add(this.hoverObj);
    this.dragLayer.moveToTop();
    this.boundMouseMoveHandler = this.mouseMoveHandler.bind(this);
    this.boundPlaceShapeHandler = this.placeShape.bind(this);

    this.stage.on("mousemove", this.boundMouseMoveHandler);
    this.stage.on("click", this.boundPlaceShapeHandler);
  }

  selectShape(e) {
    if (e.target.tagName === "LI") {
      const shapeType = e.target.getAttribute("data-info");
      this.startDrawing(shapeType);
      this.mainTransformer.nodes([]);
    }
  }

  addModalHandling(shape) {
    shape.on("dblclick", () => {
      const eventName = shape.modalEventName;
      if (eventName) {
        const data = {
          room: shape,
          map: this,
        };
        const event = new CustomEvent(eventName, { detail: data });
        window.dispatchEvent(event);
      }
    });
  }

  rotateShapesBy90Deg(e) {
    if (e.key === "r" || e.key === "R") {
      if (this.hoverObj) {
        this.hoverObj.rotate(90);
      }
      this.mainTransformer.nodes().forEach((node) => {
        node.rotate(90);
      });
    }
  }

  handleDelete(e) {
    if (e.key === "Delete") {
      this.mainTransformer.nodes().forEach((node) => {
        node.remove();
        this.shapes.splice(this.shapes.indexOf(node), 1);
      });
      this.mainTransformer.nodes([]);
      this.mainLayer.batchDraw();
    }
  }

  handleExitSelection(e) {
    if (e.key === "Escape") {
      this.mainTransformer.nodes([]);
      this.stopDrawing();
    }
  }

  handleMouseDown(e) {
    this.stage.draggable(e.evt.shiftKey);

    if (e.target !== this.stage) {
      return;
    }

    e.evt.preventDefault();
    this.x1 = this.stage.getRelativePointerPosition().x;
    this.y1 = this.stage.getRelativePointerPosition().y;
    this.x2 = this.stage.getRelativePointerPosition().x;
    this.y2 = this.stage.getRelativePointerPosition().y;

    this.selectionRectangle.width(0);
    this.selectionRectangle.height(0);
    this.selecting = true;
  }

  handleMouseMove(e) {
    if (!this.selecting) {
      return;
    }
    e.evt.preventDefault();
    this.x2 = this.stage.getRelativePointerPosition().x;
    this.y2 = this.stage.getRelativePointerPosition().y;

    this.selectionRectangle.setAttrs({
      visible: true,
      x: Math.min(this.x1, this.x2),
      y: Math.min(this.y1, this.y2),
      width: Math.abs(this.x2 - this.x1),
      height: Math.abs(this.y2 - this.y1),
    });
  }

  handleMouseUp(e) {
    this.selecting = false;
    this.stage.draggable(false);

    if (!this.selectionRectangle.visible()) {
      return;
    }

    e.evt.preventDefault();
    this.selectionRectangle.visible(false);
    const shapes = this.stage.find(".mapObj");
    const box = this.selectionRectangle.getClientRect();
    const selected = shapes.filter((shape) => Konva.Util.haveIntersection(box, shape.getClientRect()));
    this.mainTransformer.nodes(selected);
    console.log(this.mainTransformer.nodes());
  }

  saveShapeDetails() {
    this.shapes.forEach((room) => {
      room.saveShapeDetails();
      console.log(room.info);
    });
  }

  async render() {
    this.saveShapeDetails();
    const httpService = new HttpService("http://localhost:8080/api/protected", true);
    try {
      const response = await httpService.post("/render", this.shapes);
      console.log(response);
    } catch (err) {
      console.log("ERROR --> Could not render map --->", err);
    }
  }

  async saveMap(mapName) {
    this.saveShapeDetails();
    const httpService = new HttpService("http://localhost:8080/api/protected/maps", true);
    try {
      const response = await httpService.put(`/save?mapName=${mapName}`, this.shapes);
      console.log(response, "resp in builder");
    } catch (err) {
      console.log("ERROR --> Could not Save map --->", err);
    }
  }

  handleStageClick(e) {
    if (this.selectionRectangle.visible()) {
      return;
    }

    if (e.target === this.stage) {
      this.mainTransformer.nodes([]);
      return;
    }

    if (!e.target.hasName("mapObj")) {
      return;
    }

    const metaPressed = e.evt.shiftKey || e.evt.ctrlKey || e.evt.metaKey;
    const isSelected = this.mainTransformer.nodes().indexOf(e.target) >= 0;

    if (!metaPressed && !isSelected) {
      this.mainTransformer.nodes([e.target]);
      console.log("Sel 1");
    } else if (metaPressed && isSelected) {
      const nodes = this.mainTransformer.nodes().slice();
      nodes.splice(nodes.indexOf(e.target), 1);
      this.mainTransformer.nodes(nodes);
    } else if (metaPressed && !isSelected) {
      const nodes = this.mainTransformer.nodes().concat([e.target]);
      this.mainTransformer.nodes(nodes);
    }
  }

  addRoomType(roomType) {
    this.roomTypes.push(roomType);
  }

  getRoomTypes() {
    return this.roomTypes;
  }

  getRooms() {
    return this.getShapeInfoByType("Room");
  }

  getPins() {
    return this.getShapeInfoByType("InfoPin");
  }

  getEntrances() {
    return this.getShapeInfoByType("Entrance");
  }

  getConnections() {
    const pins = this.getShapeInfoByType("InfoPin");
    const entrances = this.getShapeInfoByType("Entrance");
    return [...pins, ...entrances];
  }

  getShapeInfoByType(type) {
    return this.shapes.filter((shape) => shape.className === type).map((shape) => shape.info);
  }

  updateConnections() {
    console.log("Update");

    this.shapes.forEach((shape) => {
      if (shape.className === "InfoPin" || shape.className === "Entrance") {
        shape.info.selectedPins.forEach((connectedShapeName) => {
          const connectedShape = this.shapes.find((s) => s.info.name === connectedShapeName);
          if (
            connectedShape &&
            (connectedShape.className === "InfoPin" || connectedShape.className === "Entrance")
          ) {
            if (!connectedShape.info.selectedPins.includes(shape.info.name)) {
              connectedShape.info.selectedPins.push(shape.info.name);
            }
          }
        });
      }
    });
  }

  removeConnection(from, to) {
    this.shapes
      .filter((s) => s.info.name === from || s.info.name === to)
      .forEach((s) => {
        s.info.selectedPins = s.info.selectedPins.filter((pin) => pin !== from && pin !== to);
      });
    console.log("Remove");
  }

  updateRoomNames() {
    this.textLayer.removeChildren();
    this.shapes.forEach((shape) => {
      shape.displayName(this.textLayer);
    });
    this.textLayer.children.forEach((child) => console.log(child));
  }

  clearMap() {
    this.mainLayer.removeChildren();
    this.shapes = [];
    this.hoverObj = null;
  }

  deserializeMap(data) {
    console.log("DESERIALIZING: ", data);
    this.clearMap();
    let dsrData = JSON.parse(data);
    dsrData.forEach((child) => {
      const shape = JSON.parse(child);
      const loadedShape = Factory.createShape(
        shape.className,
        { x: shape.attrs.x, y: shape.attrs.y },
        this.blockSize,
        this.mainLayer,
        shape.attrs.rotation,
          shape.attrs.scaleX,
          shape.attrs.scaleY
      );
      loadedShape.loadInfo(shape.attrs);
      this.shapes.push(loadedShape);
      this.addModalHandling(loadedShape);
      this.mainLayer.add(loadedShape);
    });
    this.mainTransformer.nodes([]);
    this.mainLayer.add(this.mainTransformer);
    this.mainLayer.add(this.selectionRectangle);

    this.shapes.forEach((shape) => shape.displayName(this.textLayer));
  }
}