using System;
using System.Collections.Generic;
using ExtensionLoader;
using OpenMetaverse;
using OpenMetaverse.Packets;

namespace Simian.Extensions
{
    public class Messaging : IExtension<Simian>
    {
        Simian server;

        public Messaging()
        {
        }

        public void Start(Simian server)
        {
            this.server = server;

            server.UDP.RegisterPacketCallback(PacketType.ChatFromViewer, new PacketCallback(ChatFromViewerHandler));
            server.UDP.RegisterPacketCallback(PacketType.ImprovedInstantMessage, new PacketCallback(ImprovedInstantMessageHandler));
        }

        public void Stop()
        {
        }

        void ChatFromViewerHandler(Packet packet, Agent agent)
        {
            ChatFromViewerPacket viewerChat = (ChatFromViewerPacket)packet;

            string message = Utils.BytesToString(viewerChat.ChatData.Message);
            if (viewerChat.ChatData.Channel != 0 || (message.Length > 0 && message.Substring(0, 1) == "/"))
                return; //not public chat

            //TODO: add distance constraints to AudibleLevel and Message 

            ChatFromSimulatorPacket chat = new ChatFromSimulatorPacket();
            chat.ChatData.Audible = (byte)ChatAudibleLevel.Fully;
            chat.ChatData.ChatType = viewerChat.ChatData.Type;
            chat.ChatData.OwnerID = agent.Avatar.ID;
            chat.ChatData.SourceID = agent.Avatar.ID;
            chat.ChatData.SourceType = (byte)ChatSourceType.Agent;
            chat.ChatData.Position = agent.Avatar.Position;
            chat.ChatData.FromName = Utils.StringToBytes(agent.Avatar.Name);
            chat.ChatData.Message = viewerChat.ChatData.Message;

            server.UDP.BroadcastPacket(chat, PacketCategory.Transaction);
        }

        void ImprovedInstantMessageHandler(Packet packet, Agent agent)
        {
            ImprovedInstantMessagePacket im = (ImprovedInstantMessagePacket)packet;
            InstantMessageDialog dialog = (InstantMessageDialog)im.MessageBlock.Dialog;

            if (dialog == InstantMessageDialog.MessageFromAgent)
            {
                lock (server.Agents)
                {
                    // HACK: Only works for agents currently online
                    Agent recipient;
                    if (server.Agents.TryGetValue(im.MessageBlock.ToAgentID, out recipient))
                    {
                        ImprovedInstantMessagePacket sendIM = new ImprovedInstantMessagePacket();
                        sendIM.MessageBlock.RegionID = UUID.Random(); //FIXME
                        sendIM.MessageBlock.ParentEstateID = 1;
                        sendIM.MessageBlock.FromGroup = false;
                        sendIM.MessageBlock.FromAgentName = Utils.StringToBytes(agent.Avatar.Name);
                        sendIM.MessageBlock.ToAgentID = im.MessageBlock.ToAgentID;
                        sendIM.MessageBlock.Dialog = im.MessageBlock.Dialog;
                        sendIM.MessageBlock.Offline = (byte)InstantMessageOnline.Online;
                        sendIM.MessageBlock.ID = agent.Avatar.ID;
                        sendIM.MessageBlock.Message = im.MessageBlock.Message;
                        sendIM.MessageBlock.BinaryBucket = new byte[0];
                        sendIM.MessageBlock.Timestamp = 0;
                        sendIM.MessageBlock.Position = agent.Avatar.Position;

                        sendIM.AgentData.AgentID = agent.Avatar.ID;

                        server.UDP.SendPacket(recipient.Avatar.ID, sendIM, PacketCategory.Transaction);
                    }
                }
            }
        }

    }
}