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package io.github.mivek.service;

import io.github.mivek.exception.ParseException;
import io.github.mivek.model.Metar;
import io.github.mivek.parser.MetarParser;

import java.io.IOException;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Class representing the service for metar.
 *
 * @author mivek
 */
public final class MetarService extends AbstractWeatherCodeService {
    /** URL to retrieve the metar from. */
    private static final String NOAA_METAR_URL = "https://tgftp.nws.noaa.gov/data/observations/metar/stations/";
    /** Instance. */
    private static final MetarService INSTANCE = new MetarService();

    /**
     * Private constructor.
     */
    private MetarService() {
        super(MetarParser.getInstance());
    }

    @Override
    public Metar decode(final String code) throws ParseException {
        return getParser().parse(code);
    }

    @Override
    public Metar retrieveFromAirport(final String icao) throws ParseException, IOException, URISyntaxException, InterruptedException {
        checkIcao(icao);
        String website = NOAA_METAR_URL + icao.toUpperCase()
                + ".TXT";
        HttpRequest request = buildRequest(website);

        HttpResponse> response = HttpClient.newBuilder()
                .build()
                .send(request, HttpResponse.BodyHandlers.ofLines());
        return getParser().parse(response.body().skip(1).collect(Collectors.joining()));
    }

    /**
     * Returns a instance of the class.
     *
     * @return the instance of the class.
     */
    public static MetarService getInstance() {
        return INSTANCE;
    }
}