package eur.one00kb.minipogodynka.weather;

import android.content.Context;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import eur.one00kb.minipogodynka.R;

// TODO: For all data providers: check if the data parsed is correct and inline with the JSON.
//  The exception handling part stinks.

public abstract class WeatherDataProvider {
    private final String mUserAgent;
    /**
     * Must contain two floating point format specifiers for latitude and longitude, in order
     */
    private String mAPILinkFormat;

    public WeatherDataProvider(Context context) {
        mUserAgent = String.format("%s", context.getString(R.string.app_name));
    }

    public void setAPILinkFormat(String format) {
        mAPILinkFormat = format;
    }

    public Map<Date, List<WeatherData>> provide(double latitude, double longitude)
            throws IOException {
        String data = fetchData(latitude, longitude);
        return parseData(data);
    }

    /**
     * @param data The JSON or otherwise data to parse.
     * @return A sorted hashmap with keys being Dates with just the day, month, and year, and the
     * values being lists of hourly weather data.
     */
    public abstract Map<Date, List<WeatherData>> parseData(String data);

    public String fetchData(double latitude, double longitude) throws IOException {
        URLConnection conn =
                new URL(String.format(Locale.US, mAPILinkFormat, latitude, longitude))
                        .openConnection();
        conn.setRequestProperty("User-Agent", mUserAgent);

        StringBuilder builder = new StringBuilder();
        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String line;

        while ((line = reader.readLine()) != null) {
            builder.append(line).append("\n");
        }

        reader.close();
        return builder.toString();
    }
}