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

import bboxPolygon from '@turf/bbox-polygon';
import distance from '@turf/distance';
import ellipse from '@turf/ellipse';
import {point} from '@turf/helpers';
import {PointerMoveEvent} from '../edit-modes/types';
import {EditAction, getIntermediatePosition} from './mode-handler';
import {TwoClickPolygonHandler} from './two-click-polygon-handler';

// TODO edit-modes: delete handlers once EditMode fully implemented
export class DrawEllipseByBoundingBoxHandler extends TwoClickPolygonHandler {
  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 corner1 = clickSequence[0];
    const corner2 = event.mapCoords;

    const minX = Math.min(corner1[0], corner2[0]);
    const minY = Math.min(corner1[1], corner2[1]);
    const maxX = Math.max(corner1[0], corner2[0]);
    const maxY = Math.max(corner1[1], corner2[1]);

    const polygonPoints = bboxPolygon([minX, minY, maxX, maxY]).geometry.coordinates[0];
    const centerCoordinates = getIntermediatePosition(corner1, corner2);

    const xSemiAxis = Math.max(distance(point(polygonPoints[0]), point(polygonPoints[1])), 0.001);
    const ySemiAxis = Math.max(distance(point(polygonPoints[0]), point(polygonPoints[3])), 0.001);
    this._setTentativeFeature(ellipse(centerCoordinates, xSemiAxis, ySemiAxis, {}));

    return result;
  }
}