using System;
using System.Collections;
using System.Data;

using System.Net;
using System.Net.Sockets;
using System.Threading;

using ChatMessage = IMDrawLibrary.Message;

namespace IMDrawServer
{
    class Server
    {
        SocketServer socketServer;
        ClientCollection clientCollection;
        private delegate void ReceiveMessageDelegate(TcpClient tcpClient);

        private void runServer(string ipAddress, string portNumber) 
        {
            try
            {
                clientCollection = new ClientCollection();
                socketServer = new SocketServer(ipAddress, portNumber);

                socketServer.ClientConnected += new SocketServer.ClientConnectedEventHandler(socketServer_ClientConnected);
                socketServer.MessageReceived += new SocketServer.MessageReceivedEventHandler(socketServer_MessageReceived);
                socketServer.ClientDisconnecting += new IMDrawServer.SocketServer.ClientDisconnectingEventHandler(socketServer_ClientDisconnecting);

                socketServer.Listen();
                Console.WriteLine("Server Started");

            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception thrown while running server. " + ex.ToString());
            }
        }

        private void AddClientToList(Client client)
        {
            clientCollection.Add(client);
            string strWriteMessage = "Connected: " + client.Name;
            Console.WriteLine(strWriteMessage);
        }

        private void SendClientList()
        {
            string strClientList = string.Empty;
            for (int i = 0; i < clientCollection.Count; i++)
            {
                strClientList += clientCollection[i].Name + "@";
            }
            strClientList = strClientList.TrimEnd(new char[] { '@' });

            ChatMessage clientListMessage = new IMDrawLibrary.Message();
            clientListMessage.Sender = IMDrawLibrary.Common.BossName;
            clientListMessage.Receiver = IMDrawLibrary.Common.All;
            clientListMessage.MessageCommand = IMDrawLibrary.Command.ClientList;
            clientListMessage.TextDetail = strClientList;

            Announce(clientListMessage);
        }

        private void Announce(ChatMessage messageToAnnounce)
        {
            for (int i = 0; i < clientCollection.Count; i++)
            {
                clientCollection[i].SendMessage(messageToAnnounce);
            }
        }

        private void socketServer_ClientConnected(object sender, Client client)
        {
            AddClientToList(client);
            SendClientList();
        }

        private void socketServer_MessageReceived(object sender, IMDrawLibrary.Message clientMessage)
        {
            if (clientMessage.MessageCommand.Equals(IMDrawLibrary.Command.Message))
            {
                for (int i = 0; i < clientCollection.Count; i++)
                {
                    if (clientMessage.Receiver.Equals(clientCollection[i].Name))
                    {
                        clientCollection[i].SendMessage(clientMessage);
                        Console.WriteLine("Message sent from " + clientMessage.Sender + 
                            " to " + clientMessage.Receiver);
                    }
                }
            }
        }

        private void socketServer_ClientDisconnecting(object sender, string clientName)
        {
            ChatMessage logoutMessage = new IMDrawLibrary.Message();
            logoutMessage.Sender = IMDrawLibrary.Common.BossName;
            logoutMessage.Receiver = clientName;
            logoutMessage.MessageCommand = IMDrawLibrary.Command.Logout;

            for (int i = 0; i < clientCollection.Count; i++)
            {
                if (clientCollection[i].Name.Equals(logoutMessage.Receiver))
                {
                    clientCollection[i].Socket.Close();
                    clientCollection.Remove(clientName);
                }
            }
            Console.WriteLine("Disconnected: " + clientName);

            SendClientList();

        }

        static void Main(string[] args)
        {
            if (args.Length != 2)
            {
                Console.WriteLine("Must pass IP Address followed by port number for the server.");
                Console.WriteLine("Ex Server 192.168.25.16 7999");
            }
            else
            {
                Server server = new Server();
                server.runServer(args[0], args[1]);
            }
        }
    }
}