import { watch } from "vue";
import { Attrib, ShapeType } from "../type";
import { Layer } from "konva/lib/Layer";
import { Entity, EntityProps, EntityType } from "./entity";
import { Stage } from "konva/lib/Stage";
import {
  IncEntitysFactory,
  incEntitysFactoryGenerate,
} from "../shared/entity-utils";
import { Shape } from "konva/lib/Shape";
import { Group } from "konva/lib/Group";
import { getAbsoluteTransform } from "../shared";
import mitt, { Emitter } from "mitt";

export type ContainerProps<
  T extends string = string,
  R extends Attrib = Attrib,
  S extends ShapeType = ShapeType,
  C extends EntityType<R, S> = EntityType<R, S>,
  TYPES extends { [key in T]: C } = { [key in T]: C },
  DATA extends { [key in T]?: R | R[] } = { [key in T]?: R | R[] }
> = {
  types: TYPES;
  data?: DATA;
  dom: HTMLDivElement;
} & Omit<EntityProps<Attrib & { data: DATA }>, "attrib">;

export class Container<
  T extends string = string,
  R extends Attrib = Attrib,
  S extends ShapeType = ShapeType,
  C extends EntityType<R, S> = EntityType<R, S>,
  TYPES extends { [key in T]: C } = { [key in T]: C },
  DATA extends { [key in T]?: R | R[] } = { [key in T]?: R | R[] },
  ENTRYS extends { [key in T]: InstanceType<TYPES[key]>[] } = {
    [key in T]: InstanceType<TYPES[key]>[];
  }
> extends Entity<Attrib & { data: DATA }, Layer> {
  bus: Emitter<{
    active: Entity;
    dataChange: void;
    dataChangeBefore: void;
    dataChangeAfter: void;
  }>;
  tempLayer: Layer;
  config: ContainerProps<T, R, S, C, TYPES, DATA>;
  entrys = {} as ENTRYS;
  stage: Stage;
  incFactorys = {} as {
    [key in T]: IncEntitysFactory<R, InstanceType<C>>;
  };

  constructor(config: ContainerProps<T, R, S, C, TYPES, DATA>) {
    for (const key in config.types) {
      config.data[key as any] = config.data[key] || [];
    }
    for (const key in config.data) {
      if (!(key in config.types)) {
        delete config.data[key];
      }
    }

    super({
      name: "container",
      attrib: { id: "0", data: config.data },
      ...config,
    });

    this.config = config;
    this.container = this;
    const { dom } = this.config;
    this.stage = new Stage({
      container: dom,
      width: dom.offsetWidth,
      height: dom.offsetHeight,
    });
    this.bus = mitt();
    // this.tempLayer = new Layer();
    // this.stage.add(this.tempLayer);
  }

  initShape() {
    const viewLayer = new Layer();
    return viewLayer;
  }

  init() {
    this.initIncFactory();
    super.init();
    this.mount(this.stage);
    this.mounted();
  }

  initIncFactory() {
    const types = this.config.types as any;
    let active: Entity | null = null;
    for (const key in types) {
      this.incFactorys[key] = incEntitysFactoryGenerate(
        types[key],
        this,
        (instance) => {
          if (!this.entrys[key]) {
            this.entrys[key] = [];
          }
          this.entrys[key].push(instance);
        },
        (instance) => {
          if (!instance.actShape?.active) return;
          const entity = instance as Entity;
          entity.enableActive((actived) => {
            if (actived) {
              if (active !== entity) {
                this.bus.emit("active", entity);
                active = entity;
              }
            } else {
              if (active === entity) {
                this.bus.emit("active", null);
                active = null;
              }
            }
          });
          const destory = entity.destory.bind(entity);
          entity.destory = () => {
            if (active === entity) {
              this.bus.emit("active", null);
              active = null;
            }
            return destory();
          };
        }
      );
    }
  }

  diffRedraw() {
    const data = this.attrib.data as any;
    const result = {} as {
      [key in T]: ReturnType<IncEntitysFactory<R, InstanceType<C>>>;
    };

    for (const key in data) {
      if (key in this.incFactorys) {
        result[key] = this.incFactorys[key](data[key]);
      }
    }
    return result;
  }

  initReactive() {
    return watch(
      () => {
        const result = {} as { [key in T]: string | string[] };
        for (const key in this.attrib.data as any) {
          const child = this.attrib.data[key];
          result[key] = Array.isArray(child)
            ? child.map(({ id }) => id)
            : child.id;
        }
        return result;
      },
      this.diffRedraw.bind(this),
      { immediate: true, flush: "sync" }
    );
  }

  // 临时绘制
  tempDraw(...shapes: Entity<Attrib, Group | Shape>[]) {
    const tels = shapes.map((shape) => shape.teleport);
    shapes.forEach((shape) => {
      shape.mount(this.tempLayer);
    });
    return () => {
      shapes.forEach((shape, ndx) => {
        shape.mount(tels[ndx]);
      });
    };
  }

  getPixelFromStage(pos: number[]) {
    const tf = getAbsoluteTransform(this.stage, true);
    const { x, y } = tf.point({ x: pos[0], y: pos[1] });
    return [x, y];
  }

  getRealFromStage(pos: number[]) {
    const tf = getAbsoluteTransform(this.stage, true).invert();
    const { x, y } = tf.point({ x: pos[0], y: pos[1] });
    return [x, y];
  }

  private prevCursor: string;
  setCursor(ico: string | null) {
    const defs = ["move", "inherit", "pointer"];
    ico = defs.includes(ico) ? ico : ico ? `url("${ico}"), auto` : "inherit";
    this.config.dom.style.cursor = ico;
    this.prevCursor = ico;

    return () => {
      if (this.prevCursor === ico) {
        this.config.dom.style.cursor = "inherit";
        this.prevCursor = "inherit";
      }
    };
  }

  getSameLevelData<T extends Entity>(
    entity: T
  ): T extends { attrib: infer A } ? A[] : never {
    const parentAttrib = this.attrib.data;
    for (const key in parentAttrib) {
      if (
        Array.isArray(parentAttrib[key]) &&
        ~(parentAttrib[key] as Attrib[]).indexOf(entity.attrib)
      ) {
        return parentAttrib[key] as any;
      }
    }
  }
}