import {
  AviationWeatherApiMetar,
  AviationWeatherNormalizedCloud,
  AviationWeatherNormalizedMetar,
} from "./AviationWeatherApi.js";

export class ScenarioWeather {
  windDirection: number;
  windSpeed: number;
  windGusts: number;
  visibility: number;
  clouds: ScenarioWeatherCloud[];
  temperature: number;

  /**
   * @param {AviationWeatherApiMetar} weatherApiData
   */
  constructor(weatherApiData: AviationWeatherApiMetar) {
    const weather = new AviationWeatherNormalizedMetar(weatherApiData);
    /**
     * @type {number} in degree
     */
    this.windDirection = weather.wdir ?? 0;

    /**
     * @type {number} in kts
     */
    this.windSpeed = weather.wspd;

    /**
     * @type {number} in kts
     */
    this.windGusts = weather.wgst ?? 0;

    /**
     * @type {number} in Statute Miles. Max is 15 for METAR values ending on a "+"
     */
    this.visibility = Math.min(15, weather.visib);

    this.clouds = weather.clouds.map((c) => {
      return new ScenarioWeatherCloud(c);
    });

    /**
     * @type {number} in °C
     */
    this.temperature = weather.temp;
  }

  /**
   * @returns {number} 0..1
   */
  get turbulenceStrength(): number {
    return Math.min(1, this.windSpeed / 80 + this.windGusts / 20);
  }
}

export class ScenarioWeatherCloud {
  cloudCoverCode: "CLR" | "FEW" | "SCT" | "BKN" | "OVC";
  cloudCover: number;
  cloudBase: number;

  /**
   * @param {AviationWeatherNormalizedCloud} cloud
   */
  constructor(cloud: AviationWeatherNormalizedCloud) {
    this.cloudCoverCode = cloud.cover;

    const cover: {
      [key: string]: [number, number];
    } = {
      CLR: [0, 0], // 0
      FEW: [1 / 8, 1 / 8], // 1/8 .. 2/8
      SCT: [2 / 8, 2 / 8], // 2/8 .. 4/8
      BKN: [4 / 8, 3 / 8], // 4/8 .. 7/8
      OVC: [7 / 8, 1 / 8], // 7/8 .. 1
    };
    const actualCover = cover[this.cloudCoverCode] ? cover[this.cloudCoverCode] : cover.CLR;

    /**
     * @type {number} 0..1
     */
    this.cloudCover = actualCover[0] + Math.random() * actualCover[1];

    /**
     * @type {number} in ft
     */
    this.cloudBase = cloud.base ?? 0;
  }
}