/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using OpenMetaverse;
using log4net;
using Nini.Config;
using System.Reflection;
using OpenSim.Services.Base;
using OpenSim.Services.Interfaces;
using OpenSim.Services.InventoryService;
using OpenSim.Data;
using OpenSim.Framework;
using OpenSim.Server.Base;

namespace OpenSim.Services.HypergridService
{
    /// <summary>
    /// Hypergrid inventory service. It serves the IInventoryService interface,
    /// but implements it in ways that are appropriate for inter-grid
    /// inventory exchanges. Specifically, it does not performs deletions
    /// and it responds to GetRootFolder requests with the ID of the
    /// Suitcase folder, not the actual "My Inventory" folder.
    /// </summary>
    public class HGSuitcaseInventoryService : XInventoryService, IInventoryService
    {
        private static readonly ILog m_log =
                LogManager.GetLogger(
                MethodBase.GetCurrentMethod().DeclaringType);

        private string m_HomeURL;
        private IUserAccountService m_UserAccountService;
        private IAvatarService m_AvatarService;

//        private UserAccountCache m_Cache;

        private ExpiringCache<UUID, List<XInventoryFolder>> m_SuitcaseTrees = new ExpiringCache<UUID, List<XInventoryFolder>>();
        private ExpiringCache<UUID, AvatarAppearance> m_Appearances = new ExpiringCache<UUID, AvatarAppearance>();

        public HGSuitcaseInventoryService(IConfigSource config, string configName)
            : base(config, configName)
        {
            m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: Starting with config name {0}", configName);
            if (configName != string.Empty)
                m_ConfigName = configName;

            if (m_Database == null)
                m_log.ErrorFormat("[HG SUITCASE INVENTORY SERVICE]: m_Database is null!");

            //
            // Try reading the [InventoryService] section, if it exists
            //
            IConfig invConfig = config.Configs[m_ConfigName];
            if (invConfig != null)
            {
                string userAccountsDll = invConfig.GetString("UserAccountsService", string.Empty);
                if (userAccountsDll == string.Empty)
                    throw new Exception("Please specify UserAccountsService in HGInventoryService configuration");

                Object[] args = new Object[] { config };
                m_UserAccountService = ServerUtils.LoadPlugin<IUserAccountService>(userAccountsDll, args);
                if (m_UserAccountService == null)
                    throw new Exception(String.Format("Unable to create UserAccountService from {0}", userAccountsDll));

                string avatarDll = invConfig.GetString("AvatarService", string.Empty);
                if (avatarDll == string.Empty)
                    throw new Exception("Please specify AvatarService in HGInventoryService configuration");

                m_AvatarService = ServerUtils.LoadPlugin<IAvatarService>(avatarDll, args);
                if (m_AvatarService == null)
                    throw new Exception(String.Format("Unable to create m_AvatarService from {0}", avatarDll));

                // Preferred
                m_HomeURL = invConfig.GetString("HomeURI", m_HomeURL);

//                m_Cache = UserAccountCache.CreateUserAccountCache(m_UserAccountService);
            }

            m_log.Debug("[HG SUITCASE INVENTORY SERVICE]: Starting...");
        }

        public override bool CreateUserInventory(UUID principalID)
        {
            // NOGO
            return false;
        }

        public override List<InventoryFolderBase> GetInventorySkeleton(UUID principalID)
        {
            XInventoryFolder suitcase = GetSuitcaseXFolder(principalID);

            List<XInventoryFolder> tree = GetFolderTree(principalID, suitcase.folderID);
            if (tree == null || (tree != null && tree.Count == 0))
                return null;

            List<InventoryFolderBase> folders = new List<InventoryFolderBase>();
            foreach (XInventoryFolder x in tree)
            {
                folders.Add(ConvertToOpenSim(x));
            }

            SetAsNormalFolder(suitcase);
            folders.Add(ConvertToOpenSim(suitcase));

            return folders;
        }

        public override InventoryCollection GetUserInventory(UUID userID)
        {
            m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: Get Suitcase inventory for user {0}", userID);
            InventoryCollection userInventory = new InventoryCollection();
            userInventory.UserID = userID;
            userInventory.Folders = new List<InventoryFolderBase>();
            userInventory.Items = new List<InventoryItemBase>();

            XInventoryFolder suitcase = GetSuitcaseXFolder(userID);

            List<XInventoryFolder> tree = GetFolderTree(userID, suitcase.folderID);
            if (tree == null || (tree != null && tree.Count == 0))
            {
                SetAsNormalFolder(suitcase);
                userInventory.Folders.Add(ConvertToOpenSim(suitcase));
                return userInventory;
            }

            List<InventoryItemBase> items;
            foreach (XInventoryFolder f in tree)
            {
                // Add the items of this subfolder
                items = GetFolderItems(userID, f.folderID);
                if (items != null && items.Count > 0)
                {
                    userInventory.Items.AddRange(items);
                }

                // Add the folder itself
                userInventory.Folders.Add(ConvertToOpenSim(f));
            }

            items = GetFolderItems(userID, suitcase.folderID);
            if (items != null && items.Count > 0)
            {
                userInventory.Items.AddRange(items);
            }

            SetAsNormalFolder(suitcase);
            userInventory.Folders.Add(ConvertToOpenSim(suitcase));

            m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: GetUserInventory for user {0} returning {1} folders and {2} items",
                userID, userInventory.Folders.Count, userInventory.Items.Count);
            return userInventory;
        }

        public override InventoryFolderBase GetRootFolder(UUID principalID)
        {
            m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: GetRootFolder for {0}", principalID);

            // Let's find out the local root folder
            XInventoryFolder root = GetRootXFolder(principalID); ;
            if (root == null)
            {
                m_log.WarnFormat("[HG SUITCASE INVENTORY SERVICE]: Unable to retrieve local root folder for user {0}", principalID);
                return null;
            }

            // Warp! Root folder for travelers is the suitcase folder
            XInventoryFolder suitcase = GetSuitcaseXFolder(principalID);

            if (suitcase == null)
            {
                m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: User {0} does not have a Suitcase folder. Creating it...", principalID);
                // make one, and let's add it to the user's inventory as a direct child of the root folder
                // In the DB we tag it as type 100, but we use -1 (Unknown) outside
                suitcase = CreateFolder(principalID, root.folderID, 100, "My Suitcase");
                if (suitcase == null)
                    m_log.ErrorFormat("[HG SUITCASE INVENTORY SERVICE]: Unable to create suitcase folder");
                m_Database.StoreFolder(suitcase);

                // Create System folders
                CreateSystemFolders(principalID, suitcase.folderID);
            }

            SetAsNormalFolder(suitcase);

            return ConvertToOpenSim(suitcase);
        }

        protected void CreateSystemFolders(UUID principalID, UUID rootID)
        {
            m_log.Debug("[HG SUITCASE INVENTORY SERVICE]: Creating System folders under Suitcase...");
            XInventoryFolder[] sysFolders = GetSystemFolders(principalID, rootID);

            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Animation) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Animation, "Animations");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Bodypart) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Bodypart, "Body Parts");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.CallingCard) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.CallingCard, "Calling Cards");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Clothing) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Clothing, "Clothing");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Gesture) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Gesture, "Gestures");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Landmark) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Landmark, "Landmarks");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.LostAndFoundFolder) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.LostAndFoundFolder, "Lost And Found");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Notecard) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Notecard, "Notecards");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Object) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Object, "Objects");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.SnapshotFolder) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.SnapshotFolder, "Photo Album");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.LSLText) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.LSLText, "Scripts");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Sound) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Sound, "Sounds");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.Texture) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.Texture, "Textures");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.TrashFolder) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.TrashFolder, "Trash");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.FavoriteFolder) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.FavoriteFolder, "Favorites");
            if (!Array.Exists(sysFolders, delegate(XInventoryFolder f) { if (f.type == (int)AssetType.CurrentOutfitFolder) return true; return false; }))
                CreateFolder(principalID, rootID, (int)AssetType.CurrentOutfitFolder, "Current Outfit");

        }

        public override InventoryFolderBase GetFolderForType(UUID principalID, AssetType type)
        {
            //m_log.DebugFormat("[HG INVENTORY SERVICE]: GetFolderForType for {0} {0}", principalID, type);
            XInventoryFolder suitcase = GetSuitcaseXFolder(principalID);
            XInventoryFolder[] folders = m_Database.GetFolders(
                    new string[] { "agentID", "type", "parentFolderID" },
                    new string[] { principalID.ToString(), ((int)type).ToString(), suitcase.folderID.ToString() });

            if (folders.Length == 0)
            {
                m_log.WarnFormat("[HG SUITCASE INVENTORY SERVICE]: Found no folder for type {0} for user {1}", type, principalID);
                return null;
            }

            m_log.DebugFormat(
                "[HG SUITCASE INVENTORY SERVICE]: Found folder {0} {1} for type {2} for user {3}",
                folders[0].folderName, folders[0].folderID, type, principalID);

            return ConvertToOpenSim(folders[0]);
        }

        public override InventoryCollection GetFolderContent(UUID principalID, UUID folderID)
        {
            InventoryCollection coll = null;

            if (!IsWithinSuitcaseTree(principalID, folderID))
                return new InventoryCollection();

            coll = base.GetFolderContent(principalID, folderID);

            if (coll == null)
            {
                m_log.WarnFormat("[HG SUITCASE INVENTORY SERVICE]: Something wrong with user {0}'s suitcase folder", principalID);
                coll = new InventoryCollection();
            }
            return coll;
        }

        public override List<InventoryItemBase> GetFolderItems(UUID principalID, UUID folderID)
        {
            // Let's do a bit of sanity checking, more than the base service does
            // make sure the given folder exists under the suitcase tree of this user
            if (!IsWithinSuitcaseTree(principalID, folderID))
                return new List<InventoryItemBase>();

            return base.GetFolderItems(principalID, folderID);
        }

        public override bool AddFolder(InventoryFolderBase folder)
        {
            //m_log.WarnFormat("[HG SUITCASE INVENTORY SERVICE]: AddFolder {0} {1}", folder.Name, folder.ParentID);
            // Let's do a bit of sanity checking, more than the base service does
            // make sure the given folder's parent folder exists under the suitcase tree of this user

            if (!IsWithinSuitcaseTree(folder.Owner, folder.ParentID))
                return false;

            // OK, it's legit
            if (base.AddFolder(folder))
            {
                List<XInventoryFolder> tree;
                if (m_SuitcaseTrees.TryGetValue(folder.Owner, out tree))
                    tree.Add(ConvertFromOpenSim(folder));

                return true;
            }

            return false;
        }

        public override bool UpdateFolder(InventoryFolderBase folder)
        {
            //m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: Update folder {0}, version {1}", folder.ID, folder.Version);
            if (!IsWithinSuitcaseTree(folder.Owner, folder.ID))
            {
                m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: folder {0} not within Suitcase tree", folder.Name);
                return false;
            }

            // For all others
            return base.UpdateFolder(folder);
        }

        public override bool MoveFolder(InventoryFolderBase folder)
        {
            if (!IsWithinSuitcaseTree(folder.Owner, folder.ID) || 
                !IsWithinSuitcaseTree(folder.Owner, folder.ParentID))
                return false;

            return base.MoveFolder(folder);
        }

        public override bool DeleteFolders(UUID principalID, List<UUID> folderIDs)
        {
            // NOGO
            return false;
        }

        public override bool PurgeFolder(InventoryFolderBase folder)
        {
            // NOGO
            return false;
        }

        public override bool AddItem(InventoryItemBase item)
        {
            // Let's do a bit of sanity checking, more than the base service does
            // make sure the given folder's parent folder exists under the suitcase tree of this user
            if (!IsWithinSuitcaseTree(item.Owner, item.Folder))
                return false;

            // OK, it's legit
            return base.AddItem(item);

        }

        public override bool UpdateItem(InventoryItemBase item)
        {
            if (!IsWithinSuitcaseTree(item.Owner, item.Folder))
                return false;

            return base.UpdateItem(item);
        }

        public override bool MoveItems(UUID principalID, List<InventoryItemBase> items)
        {
            // Principal is b0rked. *sigh*

            if (!IsWithinSuitcaseTree(items[0].Owner, items[0].Folder))
                return false;

            return base.MoveItems(principalID, items);

        }

        public override bool DeleteItems(UUID principalID, List<UUID> itemIDs)
        {
            return false;
        }

        public new InventoryItemBase GetItem(InventoryItemBase item)
        {
            InventoryItemBase it = base.GetItem(item);
            if (it == null)
            {
                m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: Unable to retrieve item {0} ({1}) in folder {2}",
                    item.Name, item.ID, item.Folder);
                return null;
            }

            if (!IsWithinSuitcaseTree(it.Owner, it.Folder) && !IsPartOfAppearance(it.Owner, it.ID))
            {
                m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: Item {0} (folder {1}) is not within Suitcase",
                    it.Name, it.Folder);
                return null;
            }

            //    UserAccount user = m_Cache.GetUser(it.CreatorId);

            //    // Adjust the creator data
            //    if (user != null && it != null && (it.CreatorData == null || it.CreatorData == string.Empty))
            //        it.CreatorData = m_HomeURL + ";" + user.FirstName + " " + user.LastName;
            //}

            return it;
        }

        public new InventoryFolderBase GetFolder(InventoryFolderBase folder)
        {
            InventoryFolderBase f = base.GetFolder(folder);

            if (f != null)
            {
                if (!IsWithinSuitcaseTree(f.Owner, f.ID))
                    return null;
            }

            return f;
        }

        //public List<InventoryItemBase> GetActiveGestures(UUID principalID)
        //{
        //}

        //public int GetAssetPermissions(UUID principalID, UUID assetID)
        //{
        //}

        #region Auxiliary functions
        private XInventoryFolder GetXFolder(UUID userID, UUID folderID)
        {
            XInventoryFolder[] folders = m_Database.GetFolders(
                    new string[] { "agentID", "folderID" },
                    new string[] { userID.ToString(), folderID.ToString() });

            if (folders.Length == 0)
                return null;

            return folders[0];
        }

        private XInventoryFolder GetRootXFolder(UUID principalID)
        {
            XInventoryFolder[] folders = m_Database.GetFolders(
                new string[] { "agentID", "folderName", "type" },
                new string[] { principalID.ToString(), "My Inventory", ((int)AssetType.RootFolder).ToString() });

            if (folders != null && folders.Length > 0)
                return folders[0];
            return null;
        }

        private XInventoryFolder GetSuitcaseXFolder(UUID principalID)
        {
            // Warp! Root folder for travelers
            XInventoryFolder[] folders = m_Database.GetFolders(
                    new string[] { "agentID", "type" },
                    new string[] { principalID.ToString(), "100" }); // This is a special folder type...

            if (folders != null && folders.Length > 0)
                return folders[0];
            
            // check to see if we have the old Suitcase folder
            folders = m_Database.GetFolders(
                    new string[] { "agentID", "folderName", "parentFolderID" },
                    new string[] { principalID.ToString(), "My Suitcase", UUID.Zero.ToString() });
            if (folders != null && folders.Length > 0)
            {
                // Move it to under the root folder
                XInventoryFolder root = GetRootXFolder(principalID);
                folders[0].parentFolderID = root.folderID;
                folders[0].type = 100;
                m_Database.StoreFolder(folders[0]);
                return folders[0];
            }

            return null;
        }

        private void SetAsNormalFolder(XInventoryFolder suitcase)
        {
            suitcase.type = (short)AssetType.Folder;
        }

        private List<XInventoryFolder> GetFolderTree(UUID principalID, UUID folder)
        {
            List<XInventoryFolder> t = null;
            if (m_SuitcaseTrees.TryGetValue(principalID, out t))
                return t;

            t = GetFolderTreeRecursive(folder);
            m_SuitcaseTrees.AddOrUpdate(principalID, t, 5*60); // 5minutes
            return t;
        }

        private List<XInventoryFolder> GetFolderTreeRecursive(UUID root)
        {
            List<XInventoryFolder> tree = new List<XInventoryFolder>();
            XInventoryFolder[] folders = m_Database.GetFolders(
                    new string[] { "parentFolderID" },
                    new string[] { root.ToString() });

            if (folders == null || (folders != null && folders.Length == 0))
                return tree; // empty tree
            else
            {
                foreach (XInventoryFolder f in folders)
                {
                    tree.Add(f);
                    tree.AddRange(GetFolderTreeRecursive(f.folderID));
                }
                return tree;
            }

        }

        /// <summary>
        /// Return true if the folderID is a subfolder of the Suitcase or the suitcase folder  itself
        /// </summary>
        /// <param name="folderID"></param>
        /// <param name="root"></param>
        /// <param name="suitcase"></param>
        /// <returns></returns>
        private bool IsWithinSuitcaseTree(UUID principalID, UUID folderID)
        {
            XInventoryFolder suitcase = GetSuitcaseXFolder(principalID);
            if (suitcase == null)
            {
                m_log.WarnFormat("[HG SUITCASE INVENTORY SERVICE]: User {0} does not have a Suitcase folder", principalID);
                return false;
            }

            List<XInventoryFolder> tree = new List<XInventoryFolder>();
            tree.Add(suitcase); // Warp! the tree is the real root folder plus the children of the suitcase folder
            tree.AddRange(GetFolderTree(principalID, suitcase.folderID));
            XInventoryFolder f = tree.Find(delegate(XInventoryFolder fl)
            {
                if (fl.folderID == folderID) return true;
                else return false;
            });

            if (f == null) return false;
            else return true;
        }
        #endregion

        #region Avatar Appearance

        private AvatarAppearance GetAppearance(UUID principalID)
        {
            AvatarAppearance a = null;
            if (m_Appearances.TryGetValue(principalID, out a))
                return a;

            a = m_AvatarService.GetAppearance(principalID);
            m_Appearances.AddOrUpdate(principalID, a, 5 * 60); // 5minutes
            return a;
        }

        private bool IsPartOfAppearance(UUID principalID, UUID itemID)
        {
            AvatarAppearance a = GetAppearance(principalID);

            if (a == null)
                return false;

            // Check wearables (body parts and clothes)
            for (int i = 0; i < a.Wearables.Length; i++)
            {
                for (int j = 0; j < a.Wearables[i].Count; j++)
                {
                    if (a.Wearables[i][j].ItemID == itemID)
                    {
                        //m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: item {0} is a wearable", itemID); 
                        return true;
                    }
                }
            }

            // Check attachments
            if (a.GetAttachmentForItem(itemID) != null)
            {
                //m_log.DebugFormat("[HG SUITCASE INVENTORY SERVICE]: item {0} is an attachment", itemID); 
                return true;
            }

            return false;
        }

        #endregion

    }

}