/**
* DServer
*
* Represents a server instance.
*
* Holds a list of DConnections,
* configuration parameters and
* more.
*/

module dnetd.dserver;

import core.thread : Thread;
import std.socket : Address, Socket, AddressFamily, SocketType, ProtocolType;
import dnetd.dconnection;
import dnetd.dchannel;
import std.string : cmp;
import core.sync.mutex : Mutex;

public class DServer : Thread
{
	/* The server's socket to bind, listen and accept connections from */
	private Socket serverSocket;

	/* Bind address */
	private Address sockAddress;


	/**
	* Connection queue
	*/
	private DConnection[] connectionQueue;

	/**
	* Channels
	*/
	private DChannel[] channels;
	private Mutex channelLock;
	
	this(Address sockAddress)
	{
		/* Set the function to be called on thread start */
		super(&dequeueLoop);
	
		/* Set the listening address */
		this.sockAddress = sockAddress;

		/* Initialize the server */
		init();

		/* Start the server */
		startServer();
	}

	private void init()
	{
		/* Setup socket */
		initNetwork();

		/* Setup queues */
		initQueues();

		/* Setup locks */
		initLocks();
	}

	/**
	* Creates the socket, binds it
	* to the given address
	*/
	private void initNetwork()
	{
		/* Create the socket */
		serverSocket = new Socket(AddressFamily.INET, SocketType.STREAM, ProtocolType.TCP);

		/* Bind the socket to the given address */
		serverSocket.bind(sockAddress);
	}

	/**
	* Creates all needed queues
	* and their mutexes
	*/
	private void initQueues()
	{
		/* TODO: Implement me */
	}

	private void initLocks()
	{
		/* Initialioze the channel lock */
		channelLock = new Mutex();
	}
	
	private void startServer()
	{
		/* Start the connection dequeue thread */
		start();
	}

	private void dequeueLoop()
	{
		/* Start accepting-and-enqueuing connections */
		serverSocket.listen(0); /* TODO: Linux be lile, hehahahhahahah who gives one - I give zero */
		
		while(true)
		{
			/* Dequeue a connection */
			Socket socket = serverSocket.accept();

			/* Spawn a connection handler */
			DConnection connection = new DConnection(this, socket);

			/* Add to the connection queue */
			connectionQueue ~= connection;
		}
	}

	public void addChannel(DConnection causer, DChannel channel)
	{
		/* Lock the channels list */
		channelLock.lock();

		channels ~= channel;

		/* TODO: Use causer */

		/* Unlock the channels list */
		channelLock.unlock();
	}

	public DChannel getChannelByName(string channelName)
	{
		/* Lock the channels list */
		channelLock.lock();

		foreach(DChannel currentChannel; channels)
		{
			if(cmp(currentChannel.getName(), channelName) == 0)
			{
				return currentChannel;
			}
		}

		/* Unlock the channels list */
		channelLock.unlock();

		return null;
	}

	public DChannel[] getChannels()
	{
		return channels;
	}
}