package org.gcube.dataharvest.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.gcube.common.authorization.client.Constants;
import org.gcube.common.authorization.client.exceptions.ObjectNotFound;
import org.gcube.common.authorization.library.AuthorizationEntry;
import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.scope.api.ScopeProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Utils {
	
	private static Logger logger = LoggerFactory.getLogger(Utils.class);

	public static Calendar dateToCalendar(Date date) {
		Calendar cal = null;
		cal = Calendar.getInstance();
		cal.setTime(date);
		return cal;
	}


	public static String dateToStringWithTZ(Date date) {
		DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
		return formatter.format(date) + "Z";
	}

	public static String getJson(String url) throws MalformedURLException, IOException {
		URL address = new URL(url);
		HttpURLConnection connection = (HttpURLConnection) address.openConnection();
		BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String json = "", line = "";

		while (line != null) {
			line = reader.readLine();
			if (line != null)
				json += line.trim();
		}
		return json;
	}
	
	public static String getCurrentContext() throws ObjectNotFound, Exception{
		return getCurrentContext(SecurityTokenProvider.instance.get());
	}
	
	public static String getCurrentContext(String token) throws ObjectNotFound, Exception{
		AuthorizationEntry authorizationEntry = Constants.authorizationService().get(token);
		String context = authorizationEntry.getContext();
		logger.info("Context of token {} is {}", token, context);
		return context;
	}
	
	
	public static void setContext(String token) throws ObjectNotFound, Exception{
		SecurityTokenProvider.instance.set(token);
		ScopeProvider.instance.set(getCurrentContext(token));
	}
}