/*
 * 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
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System.Reflection;
using System.Text;
using OpenMetaverse;
using OpenMetaverse.StructuredData;
using OpenSim.Framework;
using OpenSim.Framework.Capabilities;
using OpenSim.Framework.Servers.HttpServer;
using OpenSim.Services.Interfaces;
using OSDArray = OpenMetaverse.StructuredData.OSDArray;
using OSDMap = OpenMetaverse.StructuredData.OSDMap;

using log4net;

namespace OpenSim.Capabilities.Handlers
{
    public class FetchInventory2Handler
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private IInventoryService m_inventoryService;
        private UUID m_agentID;

        public FetchInventory2Handler(IInventoryService invService, UUID agentId)
        {
            m_inventoryService = invService;
            m_agentID = agentId;
        }

        public string FetchInventoryRequest(string request, string path, string param, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
        {
            //m_log.DebugFormat("[FETCH INVENTORY HANDLER]: Received FetchInventory capability request {0}", request);

            OSDMap requestmap = (OSDMap)OSDParser.DeserializeLLSDXml(Utils.StringToBytes(request));
            OSDArray itemsRequested = (OSDArray)requestmap["items"];

            UUID[] itemIDs = new UUID[itemsRequested.Count];
            int i = 0;

            foreach (OSDMap osdItemId in itemsRequested)
            {
                itemIDs[i++] = osdItemId["item_id"].AsUUID();
            }

            InventoryItemBase[] items = null;

            if (m_agentID != UUID.Zero)
            {
                items = m_inventoryService.GetMultipleItems(m_agentID, itemIDs);

                if (items == null)
                {
                    // OMG!!! One by one!!! This is fallback code, in case the backend isn't updated
                    m_log.WarnFormat("[FETCH INVENTORY HANDLER]: GetMultipleItems failed. Falling back to fetching inventory items one by one.");
                    items = new InventoryItemBase[itemsRequested.Count];
                    foreach (UUID id in itemIDs)
                        items[i++] = m_inventoryService.GetItem(m_agentID, id);
                }
            }
            else
            {
                items = new InventoryItemBase[itemsRequested.Count];
                foreach (UUID id in itemIDs)
                    items[i++] = m_inventoryService.GetItem(UUID.Zero, id);
            }

            StringBuilder lsl = LLSDxmlEncode.Start(4096);
            LLSDxmlEncode.AddMap(lsl);

            if(m_agentID == UUID.Zero && items.Length > 0)
                LLSDxmlEncode.AddElem("agent_id", items[0].Owner, lsl);
            else
                LLSDxmlEncode.AddElem("agent_id", m_agentID, lsl);

            if(items == null || items.Length == 0)
            {
                LLSDxmlEncode.AddEmptyArray("items", lsl);
            }
            else
            {
                LLSDxmlEncode.AddArray("items", lsl);
                foreach (InventoryItemBase item in items)
                {
                    if (item != null)
                        item.ToLLSDxml(lsl);
                }
                LLSDxmlEncode.AddEndArray(lsl);
            }            

            LLSDxmlEncode.AddEndMap(lsl);
            return LLSDxmlEncode.End(lsl);;
        }
    }
}