/*
 * @brief AgentPreferences capability module
 * 
 * Copyright (C) 2015, Cinder Roxley <cinder@sdf.org>
 * 
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 * 
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

using System;
using System.Reflection;
using System.IO;
using log4net;
using Mono.Addins;
using Nini.Config;
using OpenMetaverse;
using OpenMetaverse.StructuredData;
using OpenSim.Data;
using OpenSim.Data.MySQL;
using OpenSim.Framework.Console;
using OpenSim.Framework.Servers;
using OpenSim.Framework.Servers.HttpServer;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Services.Interfaces;
using Caps = OpenSim.Framework.Capabilities.Caps;
using OpenSim.Capabilities.Handlers;

namespace OpenSim.Region.ClientStack.LindenCaps
{
    [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "AgentPreferencesModule")]
    public class AgentPreferencesModule : ISharedRegionModule, IAgentPreferencesModule
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        public bool m_enabled { get; private set; }
        private Scene m_Scene;
        protected IAgentPreferencesData m_Database;

        public void Initialise(IConfigSource source)
        {
            IConfig dbConfig = source.Configs["DatabaseService"];
            if (dbConfig != null) 
            {
                string dllName = String.Empty;
                string connString = String.Empty;

                dllName = dbConfig.GetString("StorageProvider", dllName);
                connString = dbConfig.GetString("ConnectionString", connString);

                // We tried, but this doesn't exist. We can't proceed
                if (dllName == String.Empty)
                    throw new Exception("No StorageProvider configured");

                // *FIXME: This is a janky as hell, works for now.
                if (dllName == "OpenSim.Data.MySQL.dll")
                    m_Database = new MySQLAgentPreferencesData(connString, "AgentPrefs");
                else
                    throw new Exception("Storage provider not supported!");

                if (m_Database == null) 
                {
                    m_enabled = false;
                    throw new Exception("Could not find a storage interface in the given module");
                }
                m_log.Debug("[AgentPrefs] AgentPrefs is enabled");
                m_enabled = true;
            }
        }

        #region Region module
        public void AddRegion(Scene s)
        {
            if (!m_enabled) return;

            s.RegisterModuleInterface<IAgentPreferencesModule>(this);
            m_Scene = s;
        }

        public void RemoveRegion(Scene s)
        {
            if (!m_enabled) return;

            m_Scene.UnregisterModuleInterface<IAgentPreferencesModule>(this);
            m_Scene.EventManager.OnRegisterCaps -= RegisterCaps;
            m_Scene = null;
        }

        public void RegionLoaded(Scene s)
        {
            if (!m_enabled) return;

            m_Scene.EventManager.OnRegisterCaps += delegate(UUID agentID, OpenSim.Framework.Capabilities.Caps caps)
            {
                RegisterCaps(agentID, caps);
            };
        }

        public void PostInitialise() {}

        public void Close() {}

        public string Name { get { return "AgentPreferencesModule"; } }

        public Type ReplaceableInterface
        {
            get { return null; }
        }

        public void RegisterCaps(UUID agent, Caps caps)
        {
            UUID capId = UUID.Random();
            caps.RegisterHandler("AgentPreferences",
                new RestStreamHandler("POST", "/CAPS/" + capId,
                    delegate(string request, string path, string param,
                        IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
                    {
                        return UpdateAgentPreferences(request, path, param, agent);
                    }));
            caps.RegisterHandler("UpdateAgentLanguage",
                new RestStreamHandler("POST", "/CAPS/" + capId,
                    delegate(string request, string path, string param,
                        IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
                    {
                        return UpdateAgentPreferences(request, path, param, agent);
                    }));
            caps.RegisterHandler("UpdateAgentInformation",
                new RestStreamHandler("POST", "/CAPS/" + capId,
                    delegate(string request, string path, string param,
                        IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
                    {
                        return UpdateAgentPreferences(request, path, param, agent);
                    }));
        }

        public string UpdateAgentPreferences(string request, string path, string param, UUID agent)
        {
            m_log.DebugFormat("[AgentPrefs] UpdateAgentPreferences for {0}", agent.ToString());
            OSDMap req = (OSDMap)OSDParser.DeserializeLLSDXml(request);
            AgentPreferencesData data = m_Database.GetPrefs(agent);
            if (data == null)
            {
                data = new AgentPreferencesData();
                data.PrincipalID = agent;
            }
                
            if (req.ContainsKey("access_prefs"))
            {
                OSDMap accessPrefs = (OSDMap)req["access_prefs"];  // We could check with ContainsKey...
                data.AccessPrefs = accessPrefs["max"].AsString();
            }
            if (req.ContainsKey("default_object_perm_masks"))
            {
                OSDMap permsMap = (OSDMap)req["default_object_perm_masks"];
                data.PermEveryone = permsMap["Everyone"].AsInteger();
                data.PermGroup = permsMap["Group"].AsInteger();
                data.PermNextOwner = permsMap["NextOwner"].AsInteger();
            }
            if (req.ContainsKey("hover_height"))
            {
                data.HoverHeight = req["hover_height"].AsReal();
            }
            if (req.ContainsKey("language"))
            {
                data.Language = req["language"].AsString();
            }
            if (req.ContainsKey("language_is_public"))
            {
                data.LanguageIsPublic = req["language_is_public"].AsBoolean();
            }
            m_Database.StorePrefs(data);
            OSDMap resp = new OSDMap();
            OSDMap respAccessPrefs = new OSDMap();
                respAccessPrefs["max"] = data.AccessPrefs;
            resp["access_prefs"] = respAccessPrefs;
            OSDMap respDefaultPerms = new OSDMap();
                respDefaultPerms["Everyone"] = data.PermEveryone;
                respDefaultPerms["Group"] = data.PermGroup;
                respDefaultPerms["NextOwner"] = data.PermNextOwner;
            resp["default_object_perm_masks"] = respDefaultPerms;
            resp["god_level"] = 0; // *TODO: Add this
            resp["hover_height"] = data.HoverHeight;
            resp["language"] = data.Language;
            resp["language_is_public"] = data.LanguageIsPublic;

            string response = OSDParser.SerializeLLSDXmlString(resp);
            return response;
        }
        #endregion Region module

        #region IAgentPreferences
        public string GetLang(UUID agentID)
        {
            AgentPreferencesData data = m_Database.GetPrefs(agentID);
            if (data != null)
            {
                if (data.LanguageIsPublic)
                    return data.Language;
            }
            return "en-us";

        }
        #endregion
    }
}