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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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using System.Reflection;
using System.Collections.Generic;
using log4net;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Data.Null
{
    /// <summary>
    /// Mock region data plugin.  This obeys the api contract for persistence but stores everything in memory, so that
    /// tests can check correct persistence.
    /// </summary>
    public class NullDataStore : IRegionDataStore
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        
        protected Dictionary<UUID, RegionSettings> m_regionSettings = new Dictionary<UUID, RegionSettings>();
        protected Dictionary<UUID, SceneObjectPart> m_sceneObjectParts = new Dictionary<UUID, SceneObjectPart>();
        protected Dictionary<UUID, ICollection<TaskInventoryItem>> m_primItems 
            = new Dictionary<UUID, ICollection<TaskInventoryItem>>();
        protected Dictionary<UUID, double[,]> m_terrains = new Dictionary<UUID, double[,]>();
        protected Dictionary<UUID, LandData> m_landData = new Dictionary<UUID, LandData>();
        
        public void Initialise(string dbfile)
        {
            return;
        }

        public void Dispose()
        {
        }

        public void StoreRegionSettings(RegionSettings rs)
        {
            m_regionSettings[rs.RegionUUID] = rs;
        }
        
        public RegionLightShareData LoadRegionWindlightSettings(UUID regionUUID)
        {
            //This connector doesn't support the windlight module yet
            //Return default LL windlight settings
            return new RegionLightShareData();
        }
        
        public void StoreRegionWindlightSettings(RegionLightShareData wl)
        {
            //This connector doesn't support the windlight module yet
        }
        
        public RegionSettings LoadRegionSettings(UUID regionUUID)
        {
            RegionSettings rs = null;
            m_regionSettings.TryGetValue(regionUUID, out rs);
            return rs;
        }

        public void StoreObject(SceneObjectGroup obj, UUID regionUUID)
        {
            // We can't simply store groups here because on delinking, OpenSim will not update the original group
            // directly.  Rather, the newly delinked parts will be updated to be in their own scene object group
            // Therefore, we need to store parts rather than groups.
            foreach (SceneObjectPart prim in obj.Children.Values)
            {
                m_log.DebugFormat(
                    "[MOCK REGION DATA PLUGIN]: Storing part {0} {1} in object {2} {3} in region {4}", 
                    prim.Name, prim.UUID, obj.Name, obj.UUID, regionUUID);
                            
                m_sceneObjectParts[prim.UUID] = prim;
            }
        }

        public void RemoveObject(UUID obj, UUID regionUUID)
        {           
            // All parts belonging to the object with the uuid are removed.
            List<SceneObjectPart> parts = new List<SceneObjectPart>(m_sceneObjectParts.Values);
            foreach (SceneObjectPart part in parts)
            {
                if (part.ParentGroup.UUID == obj)
                {
                    m_log.DebugFormat(
                        "[MOCK REGION DATA PLUGIN]: Removing part {0} {1} as part of object {2} from {3}", 
                        part.Name, part.UUID, obj, regionUUID);                    
                    m_sceneObjectParts.Remove(part.UUID);
                }
            }
        }

        // see IRegionDatastore
        public void StorePrimInventory(UUID primID, ICollection<TaskInventoryItem> items)
        {
            m_primItems[primID] = items;
        }

        public List<SceneObjectGroup> LoadObjects(UUID regionUUID)
        {
            Dictionary<UUID, SceneObjectGroup> objects = new Dictionary<UUID, SceneObjectGroup>();
            
            // Create all of the SOGs from the root prims first
            foreach (SceneObjectPart prim in m_sceneObjectParts.Values)
            {
                if (prim.IsRoot)
                {
                    m_log.DebugFormat(
                        "[MOCK REGION DATA PLUGIN]: Loading root part {0} {1} in {2}", prim.Name, prim.UUID, regionUUID);                               
                    objects[prim.UUID] = new SceneObjectGroup(prim);
                }
            }

            // Add all of the children objects to the SOGs
            foreach (SceneObjectPart prim in m_sceneObjectParts.Values)
            {
                SceneObjectGroup sog;
                if (prim.UUID != prim.ParentUUID)
                {
                    if (objects.TryGetValue(prim.ParentUUID, out sog))
                    {
                        int originalLinkNum = prim.LinkNum;

                        sog.AddPart(prim);

                        // SceneObjectGroup.AddPart() tries to be smart and automatically set the LinkNum.
                        // We override that here
                        if (originalLinkNum != 0)
                            prim.LinkNum = originalLinkNum;
                    }
                    else
                    {
                        m_log.WarnFormat(
                            "[MOCK REGION DATA PLUGIN]: Database contains an orphan child prim {0} {1} in region {2} pointing to missing parent {3}.  This prim will not be loaded.",
                            prim.Name, prim.UUID, regionUUID, prim.ParentUUID);
                    }
                }
            }
            
            // TODO: Load items.  This is assymetric - we store items as a separate method but don't retrieve them that
            // way!
            
            return new List<SceneObjectGroup>(objects.Values);
        }

        public void StoreTerrain(double[,] ter, UUID regionID)
        {
            m_terrains[regionID] = ter;
        }

        public double[,] LoadTerrain(UUID regionID)
        {
            if (m_terrains.ContainsKey(regionID))
                return m_terrains[regionID];
            else
                return null;
        }

        public void RemoveLandObject(UUID globalID)
        {
            if (m_landData.ContainsKey(globalID))
                m_landData.Remove(globalID);
        }

        public void StoreLandObject(ILandObject land)
        {
            m_landData[land.LandData.GlobalID] = land.LandData;
        }

        public List<LandData> LoadLandObjects(UUID regionUUID)
        {
            return new List<LandData>(m_landData.Values);
        }

        public void Shutdown()
        {
        }
    }
}