import { GeoJsonFeature } from "../Export/GeoJson.js";
import { Units } from "../World/Units.js";
import { GaminFplWaypoint, GarminFpl, GarminFplWaypointType } from "./GarminFpl.js";

export class GeoJsonImport extends GarminFpl {
  read(configFileContent: string): void {
    this.cruisingAltFt = undefined;
    const json = JSON.parse(configFileContent);
    const lineFeatures = json.features.filter((f: GeoJsonFeature) => {
      return f.geometry.type && f.geometry.type === "LineString";
    });
    const pointFeatures = json.features.filter((f: GeoJsonFeature) => {
      return f.geometry.type && f.geometry.type === "Point" && f.properties.type !== "aircraft";
    });

    if (pointFeatures.length > 0) {
      this.waypoints = pointFeatures.map((f: GeoJsonFeature, index: number): GaminFplWaypoint => {
        if (f.properties.altitude !== undefined && index !== 0 && index !== pointFeatures.length - 1) {
          this.cruisingAltFt =
            this.cruisingAltFt !== undefined
              ? Math.max(this.cruisingAltFt, f.properties.altitude * Units.feetPerMeter)
              : f.properties.altitude;
        }
        let type: GarminFplWaypointType =
          index === 0 || index === pointFeatures.length - 1 ? "AIRPORT" : "USER WAYPOINT";
        if (type === "USER WAYPOINT" && f.properties.frequency) {
          type = f.properties.frequency.match("MHz") ? "VOR" : "NDB";
        }
        return {
          identifier: f.properties.title || "WP" + index.toFixed().padStart(2, "0"),
          type: type,
          lon: f.geometry.coordinates[0],
          lat: f.geometry.coordinates[1],
          elevationMeter: f.properties.altitude ? f.properties.altitude : undefined,
        };
      });
    } else if (lineFeatures[0]) {
      const coordinates = lineFeatures[0].geometry.coordinates;

      this.waypoints = coordinates.map((coords: number[], index: number): GaminFplWaypoint => {
        return {
          identifier: "WP" + index.toFixed().padStart(2, "0"),
          type: index === 0 || index === coordinates.length - 1 ? "AIRPORT" : "USER WAYPOINT",
          lon: coords[0],
          lat: coords[1],
          elevationMeter: 0,
        };
      });

      if (json.features[0].properties.origin) {
        this.waypoints[0].identifier = json.features[0].properties.origin;
      }
      if (json.features[0].properties.destination) {
        this.waypoints[coordinates.length - 1].identifier = json.features[0].properties.destination;
      }
    } else {
      throw new Error("Missing relevant GeoJSON features for flightplan");
    }
  }
}