import { HexadecimalHelper } from "../utils/hexadecimal";

const NEAREST_AIRPORTS_COUNT = 6;
const AIRPORT_OFFSET_SIZE = 4;
const PADDING = 16;
const TOTAL_AIRPORT_OFFSET_SIZE = AIRPORT_OFFSET_SIZE + PADDING;

export const nearestAirportsIds = (values: number[]): string[] => {
  let airports: string[] = [];

  for (
    let i = 0;
    i < TOTAL_AIRPORT_OFFSET_SIZE * NEAREST_AIRPORTS_COUNT;
    i += TOTAL_AIRPORT_OFFSET_SIZE
  ) {
    const airportBinValue = values.slice(i, i + AIRPORT_OFFSET_SIZE);
    if (airportBinValue.join("") === "0000") {
      airports.push("");
    } else {
      const airportCode = values
        .slice(i, i + AIRPORT_OFFSET_SIZE)
        .map(HexadecimalHelper.binToHex)
        .map(HexadecimalHelper.hex2string)
        .join("");
      airports.push(airportCode);
    }
  }

  return airports;
};