import { Point } from "@fboes/geojson";
import {
  AviationWeatherApiFix,
  AviationWeatherApiNavaid,
  AviationWeatherApiNavaidType,
} from "../general/AviationWeatherApi.js";

export class HoldingPatternFix {
  constructor(
    public readonly id: string,
    public readonly name: string,
    public readonly type: AviationWeatherApiNavaidType | "FIX",
    public readonly position: Point,

    /**
     * with "+" to the east and "-" to the west. Substracted from a true heading this will give the magnetic heading.
     */
    public readonly mag_dec: number = 0,

    /**
     * in Hz, null if not applicable
     */
    public readonly frequency: number | null = null,
  ) {}

  get fullName(): string {
    const frq =
      this.frequency !== null
        ? this.type === "NDB"
          ? `${this.frequency / 1_000} kHz`
          : `${this.frequency / 1_000_000} MHz`
        : "";

    if (frq) {
      return `${this.name} (${this.id}, ${frq})`;
    }

    return this.name;
  }

  static fromNavaid(navaid: AviationWeatherApiNavaid): HoldingPatternFix {
    const name = navaid.name.toLowerCase().replace(/(^|\s)[a-z]/g, (char) => {
      return char.toUpperCase();
    });
    return new HoldingPatternFix(
      navaid.id,
      name + " " + navaid.type,
      navaid.type,
      new Point(navaid.lon, navaid.lat, navaid.elev),
      navaid.mag_dec,
      navaid.freq * (navaid.type === "NDB" ? 1_000 : 1_000_000),
    );
  }

  static fromFix(fix: AviationWeatherApiFix): HoldingPatternFix {
    return new HoldingPatternFix(fix.id, fix.id + " FIX", "FIX", new Point(fix.lon, fix.lat, 0));
  }

  /**
   * Static method to create a HoldingPatternFix from an id.
   * This is used to create a fix for the Jersey holding pattern.
   * @param id VOR, NDB or FIX id
   */
  static fromId(id: string): HoldingPatternFix | null {
    switch (id) {
      case "JW":
        return new HoldingPatternFix(id, "Jersey", "NDB", new Point(-2.22, 49.2058333, 84), -0.03, 329 * 1_000);
      case "JSY":
        return new HoldingPatternFix(id, "Jersey", "VORTAC", new Point(-2.0461, 49.2211, 84), -0.09, 112.2 * 1_000_000);
      case "SHARK":
        return new HoldingPatternFix(id, id, "FIX", new Point(-2.429474, 49.189736, 0));
    }
    return null;
  }
}