import {
  type MapAreaInfo,
  MapAreaType,
  type MapPen,
  MapPointType,
  type Point,
} from '@api/map';
import { DOOR_AREA_TYPE } from '@api/map/door-area';
import { LockState, s8 } from '@meta2d/core';

import type { EditorService } from '../editor.service';
import type { AutoStorageGenerator } from '../utils/auto-storage-generator';

export class AreaManager {
  constructor(
    private readonly editor: EditorService,
    private readonly autoStorageGenerator: AutoStorageGenerator,
  ) {}

  public getBoundAreas(id: string, name: 'point' | 'line', type: MapAreaType): MapPen[] {
    if (!id) return [];
    return this.editor.find(`area-${type}`).filter(({ area }) => {
      if (name === 'point') return area?.points?.includes(id);
      if (name === 'line') return area?.routes?.includes(id);
      return false;
    });
  }

  public async addArea(p1: Point, p2: Point, type = MapAreaType.库区, id?: string): Promise<void> {
    const w = Math.abs(p1.x - p2.x);
    const h = Math.abs(p1.y - p2.y);
    if (w < 50 || h < 60) return;

    const points: string[] = [];
    const routes: string[] = [];

    if (!id) {
      id = s8();
      const selected = this.editor.store.active as MapPen[] | undefined;
      switch (type) {
        case MapAreaType.库区:
          selected
            ?.filter(({ point }) => point?.type === MapPointType.动作点)
            .forEach(({ id: pointId }) => points.push(pointId!));
          break;
        case MapAreaType.互斥区:
        case MapAreaType.非互斥区:
        case MapAreaType.约束区:
          selected?.filter(({ point }) => point?.type).forEach(({ id: pointId }) => points.push(pointId!));
          break;
        case MapAreaType.描述区:
          break;
        default:
          break;
      }
    }

    // 门区域：自动绑定与矩形相交或端点落入矩形的路段
    // 原逻辑仅在两端点都在矩形内时绑定；
    // 现在扩展为：端点都在内 OR 线段与矩形任一边相交，则绑定。
    if ((type as any) === (DOOR_AREA_TYPE as any)) {
      const areaRect = {
        x: Math.min(p1.x, p2.x),
        y: Math.min(p1.y, p2.y),
        width: Math.abs(p1.x - p2.x),
        height: Math.abs(p1.y - p2.y),
      };
      const isInRect = (x: number, y: number) =>
        x >= areaRect.x && x <= areaRect.x + areaRect.width && y >= areaRect.y && y <= areaRect.y + areaRect.height;

      // 线段与矩形是否相交（含端点在内）的简易判断：
      // 1) 任一点在矩形内
      // 2) 与矩形四条边任意一条有线段相交
      const segmentIntersectsRect = (
        x1: number,
        y1: number,
        x2: number,
        y2: number,
        rx: number,
        ry: number,
        rw: number,
        rh: number,
      ): boolean => {
        const xMin = rx;
        const xMax = rx + rw;
        const yMin = ry;
        const yMax = ry + rh;

        const pointInRect = (x: number, y: number) => x >= xMin && x <= xMax && y >= yMin && y <= yMax;
        if (pointInRect(x1, y1) || pointInRect(x2, y2)) return true;

        // 线段相交判定（跨立实验）
        const segmentsIntersect = (
          ax1: number,
          ay1: number,
          ax2: number,
          ay2: number,
          bx1: number,
          by1: number,
          bx2: number,
          by2: number,
        ): boolean => {
          const d = (x: number, y: number, x1: number, y1: number, x2: number, y2: number) =>
            (x - x1) * (y2 - y1) - (y - y1) * (x2 - x1);
          const onSegment = (x: number, y: number, x1: number, y1: number, x2: number, y2: number) =>
            Math.min(x1, x2) <= x && x <= Math.max(x1, x2) && Math.min(y1, y2) <= y && y <= Math.max(y1, y2);
          const d1 = d(ax1, ay1, bx1, by1, bx2, by2);
          const d2 = d(ax2, ay2, bx1, by1, bx2, by2);
          const d3 = d(bx1, by1, ax1, ay1, ax2, ay2);
          const d4 = d(bx2, by2, ax1, ay1, ax2, ay2);
          if (((d1 > 0 && d2 < 0) || (d1 < 0 && d2 > 0)) && ((d3 > 0 && d4 < 0) || (d3 < 0 && d4 > 0))) return true;
          // 共线且端点在线段投影上
          if (d1 === 0 && onSegment(ax1, ay1, bx1, by1, bx2, by2)) return true;
          if (d2 === 0 && onSegment(ax2, ay2, bx1, by1, bx2, by2)) return true;
          if (d3 === 0 && onSegment(bx1, by1, ax1, ay1, ax2, ay2)) return true;
          if (d4 === 0 && onSegment(bx2, by2, ax1, ay1, ax2, ay2)) return true;
          return false;
        };

        // 矩形四条边
        const leftX = xMin;
        const rightX = xMax;
        const topY = yMin;
        const bottomY = yMax;

        if (segmentsIntersect(x1, y1, x2, y2, leftX, topY, leftX, bottomY)) return true; // 左边
        if (segmentsIntersect(x1, y1, x2, y2, rightX, topY, rightX, bottomY)) return true; // 右边
        if (segmentsIntersect(x1, y1, x2, y2, leftX, topY, rightX, topY)) return true; // 上边
        if (segmentsIntersect(x1, y1, x2, y2, leftX, bottomY, rightX, bottomY)) return true; // 下边

        return false;
      };

      const allRoutes = this.editor.find('route');
      allRoutes.forEach((r) => {
        const [a1, a2] = r.anchors ?? [];
        if (!a1?.connectTo || !a2?.connectTo) return;
        const pA = this.editor.getPenById(a1.connectTo) as MapPen | undefined;
        const pB = this.editor.getPenById(a2.connectTo) as MapPen | undefined;
        if (!pA || !pB) return;
        const ra = this.editor.getPointRect(pA);
        const rb = this.editor.getPointRect(pB);
        if (!ra || !rb) return;
        const cax = (ra.x ?? 0) + (ra.width ?? 0) / 2;
        const cay = (ra.y ?? 0) + (ra.height ?? 0) / 2;
        const cbx = (rb.x ?? 0) + (rb.width ?? 0) / 2;
        const cby = (rb.y ?? 0) + (rb.height ?? 0) / 2;
        const bothInside = isInRect(cax, cay) && isInRect(cbx, cby);
        const intersects = segmentIntersectsRect(
          cax,
          cay,
          cbx,
          cby,
          areaRect.x,
          areaRect.y,
          areaRect.width,
          areaRect.height,
        );
        if (bothInside || intersects) {
          routes.push(r.id!);
        }
      });
    }

    const areaInfo: MapAreaInfo = { type, points, routes };
    if (type === MapAreaType.库区) {
      areaInfo.inoutflag = 2;
    }

    const pen: MapPen = {
      id,
      name: 'area',
      tags: ['area', `area-${type}`],
      label: `A${id}`,
      x: Math.min(p1.x, p2.x),
      y: Math.min(p1.y, p2.y),
      width: w,
      height: h,
      lineWidth: 1,
      area: areaInfo,
      locked: LockState.None,
    };

    const area = await this.editor.addPen(pen, true, true, true);
    this.editor.bottom(area);

    if (type === MapAreaType.库区 && points.length > 0) {
      this.autoStorageGenerator.triggerAutoCreateStorageDialog(pen, points);
    }
  }

  public updateArea(id: string, info: Partial<MapAreaInfo>): void {
    const { area } = this.editor.getPenById(id) ?? {};
    if (!area?.type) return;
    const mergedArea = { ...area, ...info };
    this.editor.setValue({ id, area: mergedArea }, { render: true, history: true, doEvent: true });
  }
}