// deck.gl-community
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

import {LineString} from '../utils/geojson-types';
import {generatePointsParallelToLinePoints} from '../utils/utils';
import {PointerMoveEvent} from '../edit-modes/types';
import {EditAction} from './mode-handler';
import {ThreeClickPolygonHandler} from './three-click-polygon-handler';

// TODO edit-modes: delete handlers once EditMode fully implemented
export class DrawRectangleUsingThreePointsHandler extends ThreeClickPolygonHandler {
  handlePointerMove(event: PointerMoveEvent): {
    editAction: EditAction | null | undefined;
    cancelMapPan: boolean;
  } {
    const result = {editAction: null, cancelMapPan: false};
    const clickSequence = this.getClickSequence();

    if (clickSequence.length === 0) {
      // nothing to do yet
      return result;
    }

    const mapCoords = event.mapCoords;

    if (clickSequence.length === 1) {
      this._setTentativeFeature({
        type: 'Feature',
        geometry: {
          type: 'LineString',
          coordinates: [clickSequence[0], mapCoords]
        },
        properties: {}
      });
    } else if (clickSequence.length === 2) {
      const lineString: LineString = {
        type: 'LineString',
        coordinates: clickSequence
      };
      const [p1, p2] = clickSequence;
      const [p3, p4] = generatePointsParallelToLinePoints(p1, p2, mapCoords);

      this._setTentativeFeature({
        type: 'Feature',
        geometry: {
          type: 'Polygon',
          coordinates: [
            [
              // Draw a polygon containing all the points of the LineString,
              // then the points orthogonal to the lineString,
              // then back to the starting position
              ...lineString.coordinates,
              p3,
              p4,
              p1
            ]
          ]
        },
        properties: {}
      });
    }

    return result;
  }
}