using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Reflection;
using Nwc.XmlRpc;
using OpenMetaverse;
using OpenMetaverse.Packets;
using GridProxy;
using Logger = OpenMetaverse.Logger;


namespace GridProxy
{
    public class ProxyFrame
    {
        public Proxy proxy;
        private Dictionary<string, CommandDelegate> commandDelegates = new Dictionary<string, CommandDelegate>();
        private UUID agentID;
        private UUID sessionID;
        private UUID secureSessionID;
        private UUID inventoryRoot;
        private bool logLogin = false;
        private string[] args;

        public delegate void CommandDelegate(string[] words);

        public string[] Args
        {
            get { return args; }
        }

        public UUID AgentID
        {
            get { return agentID; }
        }

        public UUID SessionID
        {
            get { return sessionID; }
        }

        public UUID SecureSessionID
        {
            get { return secureSessionID; }
        }

        public UUID InventoryRoot
        {
            get { return inventoryRoot; }
        }

        public void AddCommand(string cmd, CommandDelegate deleg)
        {
            commandDelegates[cmd] = deleg;
        }

        public ProxyFrame(string[] args)
        {
            Init(args, null);
        }

        public ProxyFrame(string[] args, ProxyConfig proxyConfig)
        {
            Init(args, proxyConfig);
        }

        private void Init(string[] args, ProxyConfig proxyConfig)
        {
            //bool externalPlugin = false;
            this.args = args;

            if (proxyConfig == null)
            {
                proxyConfig = new ProxyConfig("GridProxy", "Austin Jennings / Andrew Ortman", args, true);
            }
            proxy = new Proxy(proxyConfig);

            // add delegates for login
            proxy.AddLoginRequestDelegate(new XmlRpcRequestDelegate(LoginRequest));
            proxy.AddLoginResponseDelegate(new XmlRpcResponseDelegate(LoginResponse));

            // add a delegate for outgoing chat
            proxy.AddDelegate(PacketType.ChatFromViewer, Direction.Outgoing, new PacketDelegate(ChatFromViewerOut));

            //  handle command line arguments
            foreach (string arg in args)
                if (arg == "--log-login")
                    logLogin = true;
                else if (arg.Substring(0, 2) == "--")
                {
                    int ipos = arg.IndexOf("=");
                    if (ipos != -1)
                    {
                        string sw = arg.Substring(0, ipos);
                        string val = arg.Substring(ipos + 1);

                        Logger.Log("arg '" + sw + "' val '" + val + "'", Helpers.LogLevel.Debug);

                        if (sw == "--load")
                        {
                            //externalPlugin = true;
                            LoadPlugin(val);
                        }
                    }
                }

            commandDelegates["/load"] = new CommandDelegate(CmdLoad);
        }

        private void CmdLoad(string[] words)
        {
            if (words.Length != 2)
                SayToUser("Usage: /load <plugin name>");
            else
            {
                try
                {
                    LoadPlugin(words[1]);
                }
                catch (Exception e)
                {
                    Logger.Log("LoadPlugin exception", Helpers.LogLevel.Error, e);
                }
            }
        }

        public void LoadPlugin(string name)
        {

            Assembly assembly = Assembly.LoadFile(Path.GetFullPath(name));
            foreach (Type t in assembly.GetTypes())
            {
                try
                {
                    if (t.IsSubclassOf(typeof(ProxyPlugin)))
                    {
                        ConstructorInfo info = t.GetConstructor(new Type[] { typeof(ProxyFrame) });
                        ProxyPlugin plugin = (ProxyPlugin)info.Invoke(new object[] { this });
                        plugin.Init();
                    }
                }
                catch (Exception e)
                {
                    Logger.Log("LoadPlugin exception", Helpers.LogLevel.Error, e);
                }
            }

        }

        // LoginRequest: dump a login request to the console
        private void LoginRequest(object sender, XmlRpcRequestEventArgs e)
        {
            if (logLogin)
            {
                Console.WriteLine("==> Login Request");
                Console.WriteLine(e.m_Request);
            }
        }

        // Loginresponse: dump a login response to the console
        private void LoginResponse(XmlRpcResponse response)
        {
            System.Collections.Hashtable values = (System.Collections.Hashtable)response.Value;
            if (values.Contains("agent_id"))
                agentID = new UUID((string)values["agent_id"]);
            if (values.Contains("session_id"))
                sessionID = new UUID((string)values["session_id"]);
            if (values.Contains("secure_session_id"))
                secureSessionID = new UUID((string)values["secure_session_id"]);
            if (values.Contains("inventory-root"))
            {
                inventoryRoot = new UUID(
                    (string)((System.Collections.Hashtable)(((System.Collections.ArrayList)values["inventory-root"])[0]))["folder_id"]
                    );
                if (logLogin)
                {
                    Console.WriteLine("inventory root: " + inventoryRoot);
                }
            }

            if (logLogin)
            {
                Console.WriteLine("<== Login Response");
                Console.WriteLine(response);
            }
        }

        // ChatFromViewerOut: outgoing ChatFromViewer delegate; check for Analyst commands
        private Packet ChatFromViewerOut(Packet packet, IPEndPoint sim)
        {
            // deconstruct the packet
            ChatFromViewerPacket cpacket = (ChatFromViewerPacket)packet;
            string message = System.Text.Encoding.UTF8.GetString(cpacket.ChatData.Message).Replace("\0", "");

            if (message.Length > 1 && message[0] == '/')
            {
                string[] words = message.Split(' ');
                if (commandDelegates.ContainsKey(words[0]))
                {
                    // this is an Analyst command; act on it and drop the chat packet
                    ((CommandDelegate)commandDelegates[words[0]])(words);
                    return null;
                }
            }

            return packet;
        }

        /// <summary>
        /// Send a message to the viewer
        /// </summary>
        /// <param name="message">A string containing the message to send</param>
        public void SayToUser(string message)
        {
            SayToUser("GridProxy", message);
        }


        /// <summary>
        /// Send a message to the viewer
        /// </summary>
        /// <param name="fromName">A string containing text indicating the origin of the message</param>
        /// <param name="message">A string containing the message to send</param>
        public void SayToUser(string fromName, string message)
        {
            ChatFromSimulatorPacket packet = new ChatFromSimulatorPacket();
            packet.ChatData.SourceID = UUID.Random();
            packet.ChatData.FromName = Utils.StringToBytes(fromName);
            packet.ChatData.OwnerID = agentID;
            packet.ChatData.SourceType = (byte)2;
            packet.ChatData.ChatType = (byte)1;
            packet.ChatData.Audible = (byte)1;
            packet.ChatData.Position = new Vector3(0, 0, 0);
            packet.ChatData.Message = Utils.StringToBytes(message);
            proxy.InjectPacket(packet, Direction.Incoming);
        }
    }

    public abstract class ProxyPlugin : MarshalByRefObject
    {
        // public abstract ProxyPlugin(ProxyFrame main);
        public abstract void Init();
    }
}