/*
 * 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.
 *     * Redistributions in binary form must reproduce the above copyright
 *       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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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using log4net;
using Nini.Config;
using OpenMetaverse;
using OpenMetaverse.StructuredData;
using OpenSim.Framework;
using OpenSim.Framework.Capabilities;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Framework.Servers.HttpServer;
using OpenSim.Services.Interfaces;
using Caps = OpenSim.Framework.Capabilities.Caps;

namespace OpenSim.Capabilities.Handlers
{

    public class WebFetchInvDescHandler 
    {
        private static readonly ILog m_log =
            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private IInventoryService m_InventoryService;
        private ILibraryService m_LibraryService;
        private object m_fetchLock = new Object();

        public WebFetchInvDescHandler(IInventoryService invService, ILibraryService libService) 
        {
            m_InventoryService = invService;
            m_LibraryService = libService;
        }

        public string FetchInventoryDescendentsRequest(string request, string path, string param, OSHttpRequest httpRequest, OSHttpResponse httpResponse)
        {
            // nasty temporary hack here, the linden client falsely
            // identifies the uuid 00000000-0000-0000-0000-000000000000
            // as a string which breaks us
            //
            // correctly mark it as a uuid
            //
            request = request.Replace("<string>00000000-0000-0000-0000-000000000000</string>", "<uuid>00000000-0000-0000-0000-000000000000</uuid>");

            // another hack <integer>1</integer> results in a
            // System.ArgumentException: Object type System.Int32 cannot
            // be converted to target type: System.Boolean
            //
            request = request.Replace("<key>fetch_folders</key><integer>0</integer>", "<key>fetch_folders</key><boolean>0</boolean>");
            request = request.Replace("<key>fetch_folders</key><integer>1</integer>", "<key>fetch_folders</key><boolean>1</boolean>");

            Hashtable hash = new Hashtable();
            try
            {
                hash = (Hashtable)LLSD.LLSDDeserialize(Utils.StringToBytes(request));
            }
            catch (LLSD.LLSDParseException pe)
            {
                m_log.Error("[AGENT INVENTORY]: Fetch error: " + pe.Message);
                m_log.Error("Request: " + request.ToString());
            }

            ArrayList foldersrequested = (ArrayList)hash["folders"];

            string response = "";
            lock (m_fetchLock)
            {
                for (int i = 0; i < foldersrequested.Count; i++)
                {
                    string inventoryitemstr = "";
                    Hashtable inventoryhash = (Hashtable)foldersrequested[i];

                    LLSDFetchInventoryDescendents llsdRequest = new LLSDFetchInventoryDescendents();

                    try
                    {
                        LLSDHelpers.DeserialiseOSDMap(inventoryhash, llsdRequest);
                    }
                    catch (Exception e)
                    {
                        m_log.Debug("[CAPS]: caught exception doing OSD deserialize" + e);
                    }
                    LLSDInventoryDescendents reply = FetchInventoryReply(llsdRequest);

                    inventoryitemstr = LLSDHelpers.SerialiseLLSDReply(reply);
                    inventoryitemstr = inventoryitemstr.Replace("<llsd><map><key>folders</key><array>", "");
                    inventoryitemstr = inventoryitemstr.Replace("</array></map></llsd>", "");

                    response += inventoryitemstr;
                }


                if (response.Length == 0)
                {
                    // Ter-guess: If requests fail a lot, the client seems to stop requesting descendants.
                    // Therefore, I'm concluding that the client only has so many threads available to do requests
                    // and when a thread stalls..   is stays stalled.
                    // Therefore we need to return something valid
                    response = "<llsd><map><key>folders</key><array /></map></llsd>";
                }
                else
                {
                    response = "<llsd><map><key>folders</key><array>" + response + "</array></map></llsd>";
                }

                //m_log.DebugFormat("[CAPS]: Replying to CAPS fetch inventory request with following xml");
                //m_log.Debug("[CAPS] "+response);

            }
            return response;
        }

        /// <summary>
        /// Construct an LLSD reply packet to a CAPS inventory request
        /// </summary>
        /// <param name="invFetch"></param>
        /// <returns></returns>
        private LLSDInventoryDescendents FetchInventoryReply(LLSDFetchInventoryDescendents invFetch)
        {
            LLSDInventoryDescendents reply = new LLSDInventoryDescendents();
            LLSDInventoryFolderContents contents = new LLSDInventoryFolderContents();
            contents.agent_id = invFetch.owner_id;
            contents.owner_id = invFetch.owner_id;
            contents.folder_id = invFetch.folder_id;

            reply.folders.Array.Add(contents);
            InventoryCollection inv = new InventoryCollection();
            inv.Folders = new List<InventoryFolderBase>();
            inv.Items = new List<InventoryItemBase>();
            int version = 0;

            inv = Fetch(invFetch.owner_id, invFetch.folder_id, invFetch.owner_id, invFetch.fetch_folders, invFetch.fetch_items, invFetch.sort_order, out version);

            if (inv.Folders != null)
            {
                foreach (InventoryFolderBase invFolder in inv.Folders)
                {
                    contents.categories.Array.Add(ConvertInventoryFolder(invFolder));
                }
            }

            if (inv.Items != null)
            {
                foreach (InventoryItemBase invItem in inv.Items)
                {
                    contents.items.Array.Add(ConvertInventoryItem(invItem));
                }
            }

            contents.descendents = contents.items.Array.Count + contents.categories.Array.Count;
            contents.version = version;

            return reply;
        }

        public InventoryCollection Fetch(UUID agentID, UUID folderID, UUID ownerID,
                                            bool fetchFolders, bool fetchItems, int sortOrder, out int version)
        {
            m_log.DebugFormat(
                "[WEBFETCHINVENTORYDESCENDANTS]: Fetching folders ({0}), items ({1}) from {2} for agent {3}",
                fetchFolders, fetchItems, folderID, agentID);

            version = 0;
            InventoryFolderImpl fold;
            if (m_LibraryService != null && m_LibraryService.LibraryRootFolder != null && agentID == m_LibraryService.LibraryRootFolder.Owner)
                if ((fold = m_LibraryService.LibraryRootFolder.FindFolder(folderID)) != null)
                {
                    InventoryCollection ret = new InventoryCollection();
                    ret.Folders = new List<InventoryFolderBase>();
                    ret.Items = fold.RequestListOfItems();

                    return ret;
                }

            InventoryCollection contents = new InventoryCollection();

            if (folderID != UUID.Zero)
            {
                contents = m_InventoryService.GetFolderContent(agentID, folderID);
                InventoryFolderBase containingFolder = new InventoryFolderBase();
                containingFolder.ID = folderID;
                containingFolder.Owner = agentID;
                containingFolder = m_InventoryService.GetFolder(containingFolder);
                if (containingFolder != null)
                    version = containingFolder.Version;
            }
            else
            {
                // Lost itemsm don't really need a version
                version = 1;
            }

            return contents;

        }
        /// <summary>
        /// Convert an internal inventory folder object into an LLSD object.
        /// </summary>
        /// <param name="invFolder"></param>
        /// <returns></returns>
        private LLSDInventoryFolder ConvertInventoryFolder(InventoryFolderBase invFolder)
        {
            LLSDInventoryFolder llsdFolder = new LLSDInventoryFolder();
            llsdFolder.folder_id = invFolder.ID;
            llsdFolder.parent_id = invFolder.ParentID;
            llsdFolder.name = invFolder.Name;
            if (invFolder.Type < 0 || invFolder.Type >= TaskInventoryItem.Types.Length)
                llsdFolder.type = "-1";
            else
                llsdFolder.type = TaskInventoryItem.Types[invFolder.Type];
            llsdFolder.preferred_type = "-1";

            return llsdFolder;
        }

        /// <summary>
        /// Convert an internal inventory item object into an LLSD object.
        /// </summary>
        /// <param name="invItem"></param>
        /// <returns></returns>
        private LLSDInventoryItem ConvertInventoryItem(InventoryItemBase invItem)
        {
            LLSDInventoryItem llsdItem = new LLSDInventoryItem();
            llsdItem.asset_id = invItem.AssetID;
            llsdItem.created_at = invItem.CreationDate;
            llsdItem.desc = invItem.Description;
            llsdItem.flags = (int)invItem.Flags;
            llsdItem.item_id = invItem.ID;
            llsdItem.name = invItem.Name;
            llsdItem.parent_id = invItem.Folder;
            try
            {
                // TODO reevaluate after upgrade to libomv >= r2566. Probably should use UtilsConversions.
                llsdItem.type = TaskInventoryItem.Types[invItem.AssetType];
                llsdItem.inv_type = TaskInventoryItem.InvTypes[invItem.InvType];
            }
            catch (Exception e)
            {
                m_log.ErrorFormat("[CAPS]: Problem setting asset {0} inventory {1} types while converting inventory item {2}: {3}", invItem.AssetType, invItem.InvType, invItem.Name, e.Message);
            }
            llsdItem.permissions = new LLSDPermissions();
            llsdItem.permissions.creator_id = invItem.CreatorIdAsUuid;
            llsdItem.permissions.base_mask = (int)invItem.CurrentPermissions;
            llsdItem.permissions.everyone_mask = (int)invItem.EveryOnePermissions;
            llsdItem.permissions.group_id = invItem.GroupID;
            llsdItem.permissions.group_mask = (int)invItem.GroupPermissions;
            llsdItem.permissions.is_owner_group = invItem.GroupOwned;
            llsdItem.permissions.next_owner_mask = (int)invItem.NextPermissions;
            llsdItem.permissions.owner_id = invItem.Owner;
            llsdItem.permissions.owner_mask = (int)invItem.CurrentPermissions;
            llsdItem.sale_info = new LLSDSaleInfo();
            llsdItem.sale_info.sale_price = invItem.SalePrice;
            switch (invItem.SaleType)
            {
                default:
                    llsdItem.sale_info.sale_type = "not";
                    break;
                case 1:
                    llsdItem.sale_info.sale_type = "original";
                    break;
                case 2:
                    llsdItem.sale_info.sale_type = "copy";
                    break;
                case 3:
                    llsdItem.sale_info.sale_type = "contents";
                    break;
            }

            return llsdItem;
        }

    }
}