import { EDITOR_CONFIG, MapAreaType, type MapPen, MapPointType } from '@api/map';
import sTheme from '@core/theme.service';
import { EditType, LockState, Meta2d } from '@meta2d/core';
import { useObservable } from '@vueuse/rxjs';
import THEME from 'asset/themes/editor.json';
import { cloneDeep, pick } from 'lodash-es';
import { debounceTime, filter, map, Subject, switchMap } from 'rxjs';
import { watch } from 'vue';

export type Point = Record<'x' | 'y', number>;

export class EditorService extends Meta2d {
  public load(map?: string, readonly = false): void {
    const data = map ? JSON.parse(map) : undefined;
    this.open(data);
    this.lock(readonly ? LockState.Disable : LockState.None);
  }
  public save(): string {
    const data = this.data();
    const map = JSON.stringify(data);
    return map;
  }
  public export(): string {
    const png = this.toPng(10);
    return png;
  }

  readonly #mouse$$ = new Subject<{ type: 'click' | 'mousedown' | 'mouseup'; value: Point }>();
  public readonly mouseClick = useObservable<Point>(
    this.#mouse$$.pipe(
      filter(({ type }) => type === 'click'),
      debounceTime(100),
      map(({ value }) => value),
    ),
  );
  public readonly mouseBrush = useObservable<[Point, Point]>(
    this.#mouse$$.pipe(
      filter(({ type }) => type === 'mousedown'),
      switchMap(({ value: s }) =>
        this.#mouse$$.pipe(
          filter(({ type }) => type === 'mouseup'),
          map(({ value: e }) => <[Point, Point]>[s, e]),
        ),
      ),
    ),
  );

  //#region 点位
  public async addPoint(p: Point, type = MapPointType.普通点): Promise<void> {
    const pen: MapPen = {
      name: 'point',
      x: p.x,
      y: p.y,
      width: 24,
      height: 24,
      point: { type },
    };
    await this.addPen(pen, false, true, true);
    this.pushHistory({ type: EditType.Add, pens: [cloneDeep(pen)] });
  }
  //#endregion

  //#region 线路
  //#endregion

  //#region 区域
  public async addArea(p1: Point, p2: Point, type = MapAreaType.库区) {
    const scale = this.data().scale ?? 1;
    const w = Math.abs(p1.x - p2.x);
    const h = Math.abs(p1.y - p2.y);
    if (w * scale < 50 || h * scale < 60) return;
    const pen: MapPen = {
      name: 'area',
      x: Math.min(p1.x, p2.x),
      y: Math.min(p1.y, p2.y),
      width: w,
      height: h,
      area: { type },
      locked: LockState.DisableMoveScale,
    };
    const area = await this.addPen(pen, false, true, true);
    this.bottom(area);
    this.pushHistory({ type: EditType.Add, pens: [cloneDeep(pen)] });
  }
  //#endregion

  constructor(container: HTMLDivElement) {
    super(container, EDITOR_CONFIG);

    (<HTMLDivElement>container.children.item(5)).ondrop = null;
    this.on('*', (e, v) => this.#listen(e, v));
    this.#register();

    watch(
      () => sTheme.theme,
      (v) => this.setTheme(v),
      { immediate: true },
    );
  }

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  #listen(e: unknown, v: any) {
    switch (e) {
      case 'click':
      case 'mousedown':
      case 'mouseup':
        this.#mouse$$.next({ type: e, value: pick(v, 'x', 'y') });
        break;

      default:
        // console.log(e, v);
        break;
    }
  }

  #register() {
    this.store.theme = THEME;
    this.registerCanvasDraw({ point: drawPoint, line: drawLine, area: drawArea });
    this.registerAnchors({ point: anchorPoint });
  }
}

//#region 绘制函数
function drawPoint(ctx: CanvasRenderingContext2D, pen: MapPen): void {
  const { x = 0, y = 0, width = 0, height = 0 } = pen.calculative?.worldRect ?? {};
  const { type } = pen.point ?? {};
  ctx.save();
  ctx.lineWidth = 2;
  ctx.roundRect(x, y, width, height, 4);
  ctx.stroke();
  ctx.fillStyle = '#fff';
  ctx.fillText(String(type), x + width / 2, y + height / 2);
  ctx.restore();
}
function anchorPoint(pen: MapPen): void {
  pen.anchors = [{ x: 0.5, y: 0.5 }];
}

function drawLine(ctx: CanvasRenderingContext2D, pen: MapPen): void {
  const [p1, p2] = pen.calculative?.worldAnchors ?? [];
  const { direction } = pen.route ?? {};
  ctx.save();
  ctx.lineWidth = 2;
  ctx.restore();
}

function drawArea(ctx: CanvasRenderingContext2D, pen: MapPen): void {
  const { x = 0, y = 0, width = 0, height = 0 } = pen.calculative?.worldRect ?? {};
  const { type } = pen.area ?? {};
  ctx.save();
  ctx.lineWidth = 1;
  ctx.strokeRect(x, y, width, height);
  ctx.fillStyle = '#fff';
  ctx.fillText(String(type), x + width / 2, y);
  ctx.restore();
}
//#endregion