import { Entity, EntityEvent, EntityTree } from "./entity";
import konva from "konva";
import { entityMount } from "./entity-server";
import { Emitter, Pos, RootMat } from "../type";
import {
  EditModeProps,
  injectSetCursor,
  injectConstant,
  EditModeChange,
  openEditModePacking,
  injectPointerEvents,
  PointerEvents,
} from "./entity-root-server";
import { inRevise } from "../../shared";
import { Transform } from "konva/lib/Util";

export type RootEvent = EntityEvent & {
  triggerFocus: Entity;
  triggerDrag: Entity | null;

  addEntity: Entity;
  delEntity: Entity;
  setEntity: Entity;

  entityChangeBefore: void;
  entityChange: EditModeChange;
  entityChangeAfter: void;

  changeView: RootMat;
  changeViewPort: Pos;
  changeViewScale: RootMat["scale"];
  changeViewPosition: RootMat["position"];
  changeViewRotation: RootMat["rotation"];
};

export class Root<T extends Entity = any> extends Entity<
  null,
  konva.Layer,
  EntityTree<never, T, Root<Entity>>
> {
  dragEntity: Entity | null = null;
  container?: HTMLDivElement;
  stage: konva.Stage;
  fixLayer: konva.Layer;
  tempLayer: konva.Layer;
  bus: Emitter<RootEvent>;
  mat: Transform;
  invMat: Transform;
  tempComtainer = document.createElement("div");

  constructor() {
    super({
      name: "container",
      attrib: null,
      key: "root",
    });
    this.root = this;
    this.stage = new konva.Stage({ container: document.createElement("div") });
    this.fixLayer = new konva.Layer();
    this.mat = this.stage.getTransform();
    this.invMat = this.mat.copy().invert();

    this.stage.add(this.fixLayer);
    this.setTeleport(this.stage);
  }

  history: null | { hasRecovery: boolean };
  setHistory(history: null | { hasRecovery: boolean }) {
    this.history = history;
  }

  setCursor = injectSetCursor(this);

  initShape() {
    return new konva.Layer();
  }

  trigger: PointerEvents;
  openPointerEvents() {
    this.trigger = injectPointerEvents(this);
  }
  closePointerEvents() {
    this.trigger && this.trigger.destory();
  }

  private __editPacking: ReturnType<typeof openEditModePacking>;
  get hasEditMode() {
    return !!this.__editPacking;
  }
  editMode(props?: EditModeProps) {
    if (this.__editPacking) {
      throw "当前正在编辑模式";
    }
    this.__editPacking = openEditModePacking(this, props);
  }

  leaveEditMode() {
    if (this.__editPacking) {
      this.__editPacking.complete();
      this.__editPacking = null;
    }
  }
  interruptEditMode() {
    if (this.__editPacking) {
      this.__editPacking.interrupt();
      this.__editPacking = null;
    }
  }

  getPixel(real: Pos) {
    return this.mat.point(real);
  }

  getReal(pixel: Pos) {
    return this.invMat.point(pixel);
  }

  constant = injectConstant(this);

  private __changeContainerRelease: () => void;
  mount(container: HTMLDivElement = this.tempComtainer): void {
    if (container === this.container && this.isMounted) return;
    if (!container) throw "mount 需要 container";

    if (this.container) {
      this.__changeContainerRelease();
    }
    const changeSize = () => {
      const w = container.offsetWidth;
      const h = container.offsetHeight;
      if (w !== this.stage.width() || h !== this.stage.height()) {
        this.stage.width(w);
        this.stage.height(h);
        this.bus.emit("changeViewPort", { x: w, y: h });
      }
    };

    if (container) {
      this.stage.setContainer(container);
      changeSize();
      window.addEventListener("resize", changeSize);
      this.__changeContainerRelease = () => {
        window.removeEventListener("resize", changeSize);
      };
      this.container = container;
      this.isMounted || entityMount(this);
    }
  }

  updateViewMat(transform: Transform) {
    const mat = transform.decompose();
    const scale = {
      x: mat.scaleX,
      y: mat.scaleY,
    };
    const position = {
      x: mat.x,
      y: mat.y,
    };
    const rotation = mat.rotation;

    const scaleChange = inRevise(scale, this.shape.scale());
    const positionChange = inRevise(position, this.shape.position());
    const rotateChange = inRevise(rotation, this.shape.rotation());

    this.shape.scale(scale);
    this.shape.rotate(rotation);
    this.shape.position(position);

    this.mat = transform.copy();
    this.invMat = transform.copy().invert();
    this.shape.draw();

    if (scaleChange) {
      this.bus.emit("changeViewScale", scale);
    }
    if (positionChange) {
      this.bus.emit("changeViewPosition", position);
    }
    if (rotateChange) {
      this.bus.emit("changeViewRotation", rotation);
    }

    if (rotateChange || scaleChange || positionChange) {
      this.bus.emit("changeView", {
        scale: this.shape.scale(),
        position: this.shape.position(),
        rotation: this.shape.rotation(),
      });
    }
  }
}