package org.dyndns.jkiddo.raop.client.model;


import java.net.Socket;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.logging.Logger;
import java.util.logging.Level;

import org.dyndns.jkiddo.raop.client.command.DeviceCommand;

/**
 * Copyright (c) 2011 Carson McDonald Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. This class manages the connection to an AirPlay device.
 */
public class DeviceConnection
{
	private static final Logger LOGGER = Logger.getLogger(DeviceConnection.class.getName());

	private final Device device;
	private Socket socket;

	public DeviceConnection(Device device)
	{
		this.device = device;
	}

	public void close()
	{
		if(socket != null)
		{
			try
			{
				socket.close();
			}
			catch(IOException e)
			{
				// ignore anything here
			}
		}
	}

	public DeviceResponse sendCommand(DeviceCommand command)
	{
		if(socket == null || socket.isClosed())
		{
			try
			{
				socket = new Socket(device.getInetAddress(), device.getPort());
			}
			catch(IOException e)
			{
				LOGGER.log(Level.SEVERE, e.getMessage(), e);
				throw new RuntimeException(e.getMessage(), e);
			}
		}

		try
		{
			BufferedReader deviceInput = new BufferedReader(
                    new InputStreamReader(socket.getInputStream(), StandardCharsets.UTF_8));
			BufferedWriter deviceOutput = new BufferedWriter(
                    new OutputStreamWriter(socket.getOutputStream(), StandardCharsets.UTF_8));

			String commandString = command.getCommandString();
			deviceOutput.write(commandString + "\n");
			deviceOutput.flush();

			StringBuffer fullResponse = new StringBuffer();
			String partialResponse;
			while(!(partialResponse = deviceInput.readLine().trim()).equals(""))
			{
				fullResponse.append(partialResponse);
				fullResponse.append("\n");
			}

			int contentLength = 0;
			if(fullResponse.indexOf("Content-Length:") != -1)
			{
				String cls = "Content-Length:";
				int si = fullResponse.indexOf(cls);
				int ei = fullResponse.indexOf("\n", si + cls.length());
				contentLength = Integer.parseInt(fullResponse.substring(si + cls.length(), ei).trim());
			}

			StringBuffer content = null;
			if(contentLength > 0)
			{
				content = new StringBuffer(contentLength);
				char[] buffer = new char[1024];
				int read, totalRead = 0;
				do
				{
					read = deviceInput.read(buffer);
					totalRead += read;
					content.append(buffer, 0, read);
				}
				while(read != -1 && totalRead < contentLength);
			}

			return new DeviceResponse(fullResponse.toString(), content == null ? null : content.toString());
		}
		catch(IOException e)
		{
			LOGGER.log(Level.SEVERE, e.getMessage(), e);
			throw new RuntimeException(e.getMessage(), e);
		}
	}
}