package org.bukkit.craftbukkit.util;

import com.google.common.base.Charsets;
import com.google.gson.Gson;
import org.apache.commons.io.IOUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.UUID;

public class MojangNameLookup
{
	private static final Logger logger = LogManager.getFormatterLogger(MojangNameLookup.class);

	public static String lookupName(UUID id)
	{
		if(id == null)
		{
			return null;
		}

		InputStream inputStream = null;
		try
		{
			URL url = new URL("https://sessionserver.mojang.com/session/minecraft/profile/" + id.toString().replace("-", ""));
			URLConnection connection = url.openConnection();
			connection.setConnectTimeout(15000);
			connection.setReadTimeout(15000);
			connection.setUseCaches(false);
			inputStream = connection.getInputStream();
			String result = IOUtils.toString(inputStream, Charsets.UTF_8);
			Gson gson = new Gson();
			Response response = gson.fromJson(result, Response.class);
			if(response == null || response.name == null)
			{
				logger.warn("Failed to lookup name from UUID");
				return null;
			}

			if(response.cause != null && response.cause.length() > 0)
			{
				logger.warn("Failed to lookup name from UUID: %s", response.errorMessage);
				return null;
			}

			return response.name;
		} catch(MalformedURLException ex)
		{
			logger.warn("Malformed URL in UUID lookup");
			return null;
		} catch(IOException ex)
		{
			IOUtils.closeQuietly(inputStream);
		} finally
		{
			IOUtils.closeQuietly(inputStream);
		}

		return null;
	}

	private class Response
	{
		String errorMessage;
		String cause;
		String name;
	}
}