/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type Coordinate from '../../common/Coordinate';
import type Bounding from '../../common/Bounding';

import { type OverlayTemplate } from '../../component/Overlay';

import { getLinearYFromCoordinates, type LineAttrs } from '../figure/line';

export function getRayLine(
  coordinates: Coordinate[],
  bounding: Bounding,
): LineAttrs | LineAttrs[] {
  if (coordinates.length > 1) {
    let coordinate: Coordinate;
    if (
      coordinates[0].x === coordinates[1].x &&
      coordinates[0].y !== coordinates[1].y
    ) {
      if (coordinates[0].y < coordinates[1].y) {
        coordinate = {
          x: coordinates[0].x,
          y: bounding.height,
        };
      } else {
        coordinate = {
          x: coordinates[0].x,
          y: 0,
        };
      }
    } else if (coordinates[0].x > coordinates[1].x) {
      coordinate = {
        x: 0,
        y: getLinearYFromCoordinates(coordinates[0], coordinates[1], {
          x: 0,
          y: coordinates[0].y,
        }),
      };
    } else {
      coordinate = {
        x: bounding.width,
        y: getLinearYFromCoordinates(coordinates[0], coordinates[1], {
          x: bounding.width,
          y: coordinates[0].y,
        }),
      };
    }
    return { coordinates: [coordinates[0], coordinate] };
  }
  return [];
}

const rayLine: OverlayTemplate = {
  name: 'rayLine',
  totalStep: 3,
  needDefaultPointFigure: true,
  needDefaultXAxisFigure: true,
  needDefaultYAxisFigure: true,
  createPointFigures: ({ coordinates, bounding }) => {
    return [
      {
        type: 'line',
        attrs: getRayLine(coordinates, bounding),
      },
    ];
  },
};

export default rayLine;