using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Services.Interfaces;
using OpenSim.Services.Connectors.Hypergrid;
using FriendInfo = OpenSim.Services.Interfaces.FriendInfo;

using OpenMetaverse;

using log4net;

namespace OpenSim.Region.CoreModules.Avatar.Friends
{
    public class HGStatusNotifier
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private HGFriendsModule m_FriendsModule;

        public HGStatusNotifier(HGFriendsModule friendsModule)
        {
            m_FriendsModule = friendsModule;
        }

        public void Notify(UUID userID, Dictionary<string, List<FriendInfo>> friendsPerDomain, bool online)
        {
            foreach (KeyValuePair<string, List<FriendInfo>> kvp in friendsPerDomain)
            {
                if (kvp.Key != "local")
                {
                    // For the others, call the user agent service
                    List<string> ids = new List<string>();
                    foreach (FriendInfo f in kvp.Value)
                        ids.Add(f.Friend);

                    if (ids.Count == 0)
                        continue; // no one to notify. caller don't do this

                    //m_log.DebugFormat("[HG STATUS NOTIFIER]: Notifying {0} friends in {1}", ids.Count, kvp.Key);
                    // ASSUMPTION: we assume that all users for one home domain
                    // have exactly the same set of service URLs.
                    // If this is ever not true, we need to change this.
                    if (Util.ParseUniversalUserIdentifier(ids[0], out UUID friendID))
                    {
                        string friendsServerURI = m_FriendsModule.UserManagementModule.GetUserServerURL(friendID, "FriendsServerURI");
                        if (friendsServerURI != string.Empty)
                        {
                            HGFriendsServicesConnector fConn = new HGFriendsServicesConnector(friendsServerURI);

                            List<UUID> friendsOnline = fConn.StatusNotification(ids, userID, online);

                            if (online && friendsOnline.Count > 0)
                            {
                                IClientAPI client = m_FriendsModule.LocateClientObject(userID);
                                if (client != null)
                                    client.SendAgentOnline(friendsOnline.ToArray());
                            }
                        }
                    }
                }
            }
        }
    }
}