/*
* 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:
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*       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.
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*       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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* 
*/

using System;
using System.Collections.Generic;
using System.Xml.Serialization;

using libsecondlife;

using OpenSim.Framework;
using OpenSim.Framework.Console;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.Environment.Scenes.Scripting;

namespace OpenSim.Region.Environment.Scenes
{
    public partial class SceneObjectPart : IScriptHost
    {
        private string m_inventoryFileName = "";
        
        /// <summary>
        /// The inventory folder for this prim
        /// </summary>
        private LLUUID m_folderID = LLUUID.Zero;
        
        /// <summary>
        /// Exposing this is not particularly good, but it's one of the least evils at the moment to see
        /// folder id from prim inventory item data, since it's not (yet) actually stored with the prim.
        /// </summary>
        public LLUUID FolderID
        {
            get { return m_folderID; }
            set { m_folderID = value; }
        }        

        /// <summary>
        /// Holds in memory prim inventory
        /// </summary> 
        protected IDictionary<LLUUID, TaskInventoryItem> m_taskInventory 
            = new Dictionary<LLUUID, TaskInventoryItem>();
        
        [XmlIgnore]
        public IDictionary<LLUUID, TaskInventoryItem> TaskInventory
        {
            get { return m_taskInventory; }
        }
        
        /// <summary>
        /// Serial count for inventory file , used to tell if inventory has changed
        /// no need for this to be part of Database backup
        /// </summary>
        protected uint m_inventorySerial = 0;

        public uint InventorySerial
        {
            get { return m_inventorySerial; }
        }
        
        
        /// <summary>
        /// Start all the scripts contained in this prim's inventory
        /// </summary>
        public void StartScripts()
        {
            foreach (TaskInventoryItem item in m_taskInventory.Values)
            {
                // XXX more hardcoding badness.  Should be an enum in TaskInventoryItem
                if (10 == item.type)
                {
                    StartScript(item);
                }
            }
        }
        
        /// <summary>
        /// Start a script which is in this prim's inventory.
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public void StartScript(TaskInventoryItem item)
        {
//            MainLog.Instance.Verbose(
//                "PRIMINVENTORY", 
//                "Starting script {0}, {1} in prim {2}, {3}", 
//                item.name, item.item_id, Name, UUID);
            
            AssetBase rezAsset = m_parentGroup.Scene.AssetCache.GetAsset(item.asset_id, false);

            if (rezAsset != null)
            {
                string script = Helpers.FieldToUTF8String(rezAsset.Data);
                m_parentGroup.Scene.EventManager.TriggerRezScript(LocalID, item.item_id, script);
            }     
            else
            {
                MainLog.Instance.Error(
                    "PRIMINVENTORY", 
                    "Couldn't start script {0}, {1} since asset ID {2} could not be found", 
                    item.name, item.item_id, item.asset_id);
            }
        }   
        
        /// <summary>
        /// Start a script which is in this prim's inventory.
        /// </summary>
        /// <param name="itemId">
        /// A <see cref="LLUUID"/>
        /// </param>        
        public void StartScript(LLUUID itemId)
        {
            if (m_taskInventory.ContainsKey(itemId))
            {
                StartScript(m_taskInventory[itemId]);
            }            
            else
            {
                MainLog.Instance.Error(
                    "PRIMINVENTORY", 
                    "Couldn't start script with ID {0} since it couldn't be found for prim {1}, {2}", 
                    itemId, Name, UUID);
            }                
            
        }        
        
        /// <summary>
        /// Stop a script which is in this prim's inventory.
        /// </summary>
        /// <param name="itemId"></param>        
        public void StopScript(LLUUID itemId)
        {
            if (m_taskInventory.ContainsKey(itemId))
            {
                m_parentGroup.Scene.EventManager.TriggerRemoveScript(LocalID, itemId);
            }            
            else
            {
                MainLog.Instance.Error(
                    "PRIMINVENTORY", 
                    "Couldn't stop script with ID {0} since it couldn't be found for prim {1}, {2}", 
                    itemId, Name, UUID);
            }                            
        }        

        /// <summary>
        /// Add an item to this prim's inventory.
        /// </summary>
        /// <param name="item"></param>
        public void AddInventoryItem(TaskInventoryItem item)
        {
            item.parent_id = m_folderID;
            item.creation_date = 1000;
            item.ParentPartID = UUID;
            m_taskInventory.Add(item.item_id, item);
            m_inventorySerial++;
        }
        
        /// <summary>
        /// Add a whole collection of items to the prim's inventory at once.  We assume that the items already
        /// have all their fields correctly filled out.
        /// </summary>
        /// <param name="items"></param>
        public void AddInventoryItems(ICollection<TaskInventoryItem> items)
        {
            foreach (TaskInventoryItem item in items)
            {
                m_taskInventory.Add(item.item_id, item);
            }
            
            m_inventorySerial++;
        }
        
        /// <summary>
        /// Returns an existing inventory item.  Returns the original, so any changes will be live.
        /// </summary>
        /// <param name="itemID"></param>
        /// <returns>null if the item does not exist</returns>
        public TaskInventoryItem GetInventoryItem(LLUUID itemID)
        {
            if (m_taskInventory.ContainsKey(itemID))
            {
                return m_taskInventory[itemID];
            }
            else
            {
                MainLog.Instance.Error(
                    "PRIMINVENTORY",
                    "Tried to retrieve item ID {0} from prim {1}, {2} but the item does not exist in this inventory",
                    itemID, Name, UUID);
            }

            return null;
        }

        /// <summary>
        /// Update an existing inventory item.
        /// </summary>
        /// <param name="item">The updated item.  An item with the same id must already exist
        /// in this prim's inventory.</param>
        /// <returns>false if the item did not exist, true if the update occurred succesfully</returns>
        public bool UpdateInventoryItem(TaskInventoryItem item)
        {
            if (m_taskInventory.ContainsKey(item.item_id))
            {
                m_taskInventory[item.item_id] = item;
                m_inventorySerial++;
                
                return true;
            }
            else
            {
                MainLog.Instance.Error(
                    "PRIMINVENTORY",
                    "Tried to retrieve item ID {0} from prim {1}, {2} but the item does not exist in this inventory",
                    item.item_id, Name, UUID);
            }   
            
            return false;
        }

        /// <summary>
        /// Remove an item from this prim's inventory
        /// </summary>
        /// <param name="itemID"></param>
        /// <returns>Numeric asset type of the item removed.  Returns -1 if the item did not exist
        /// in this prim's inventory.</returns>
        public int RemoveInventoryItem(LLUUID itemID)
        {
            if (m_taskInventory.ContainsKey(itemID))
            {
                int type = m_taskInventory[itemID].inv_type;
                m_taskInventory.Remove(itemID);
                m_inventorySerial++;
                
                return type;
            }
            else
            {
                MainLog.Instance.Error(
                    "PRIMINVENTORY",
                    "Tried to remove item ID {0} from prim {1}, {2} but the item does not exist in this inventory",
                    itemID, Name, UUID);
            }            

            return -1;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="client"></param>
        /// <param name="localID"></param>
        public bool GetInventoryFileName(IClientAPI client, uint localID)
        {
            if (m_inventorySerial > 0)
            {
                client.SendTaskInventory(m_uuid, (short) m_inventorySerial,
                                         Helpers.StringToField(m_inventoryFileName));
                return true;
            }
            else
            {
                client.SendTaskInventory(m_uuid, 0, new byte[0]);
                return false;
            }
        }

        public void RequestInventoryFile(IXfer xferManager)
        {
            byte[] fileData = new byte[0];
            InventoryStringBuilder invString = new InventoryStringBuilder(m_folderID, UUID);
            foreach (TaskInventoryItem item in m_taskInventory.Values)
            {
                invString.AddItemStart();
                invString.AddNameValueLine("item_id", item.item_id.ToString());
                invString.AddNameValueLine("parent_id", item.parent_id.ToString());

                invString.AddPermissionsStart();
                invString.AddNameValueLine("base_mask", "0x7FFFFFFF");
                invString.AddNameValueLine("owner_mask", "0x7FFFFFFF");
                invString.AddNameValueLine("group_mask", "0x7FFFFFFF");
                invString.AddNameValueLine("everyone_mask", "0x7FFFFFFF");
                invString.AddNameValueLine("next_owner_mask", "0x7FFFFFFF");
                invString.AddNameValueLine("creator_id", item.creator_id.ToString());
                invString.AddNameValueLine("owner_id", item.owner_id.ToString());
                invString.AddNameValueLine("last_owner_id", item.last_owner_id.ToString());
                invString.AddNameValueLine("group_id", item.group_id.ToString());
                invString.AddSectionEnd();

                invString.AddNameValueLine("asset_id", item.asset_id.ToString());
                invString.AddNameValueLine("type", TaskInventoryItem.Types[item.type]);
                invString.AddNameValueLine("inv_type", TaskInventoryItem.InvTypes[item.inv_type]);
                invString.AddNameValueLine("flags", "0x00");
                invString.AddNameValueLine("name", item.name + "|");
                invString.AddNameValueLine("desc", item.desc + "|");
                invString.AddNameValueLine("creation_date", item.creation_date.ToString());
                invString.AddSectionEnd();
            }
            
            fileData = Helpers.StringToField(invString.BuildString);
            
//            MainLog.Instance.Verbose(
//                "PRIMINVENTORY", "RequestInventoryFile fileData: {0}", Helpers.FieldToUTF8String(fileData));
            
            if (fileData.Length > 2)
            {
                xferManager.AddNewFile(m_inventoryFileName, fileData);
            }
        }

        public class InventoryStringBuilder
        {
            public string BuildString = "";

            public InventoryStringBuilder(LLUUID folderID, LLUUID parentID)
            {
                BuildString += "\tinv_object\t0\n\t{\n";
                AddNameValueLine("obj_id", folderID.ToString());
                AddNameValueLine("parent_id", parentID.ToString());
                AddNameValueLine("type", "category");
                AddNameValueLine("name", "Contents");
                AddSectionEnd();
            }

            public void AddItemStart()
            {
                BuildString += "\tinv_item\t0\n";
                BuildString += "\t{\n";
            }

            public void AddPermissionsStart()
            {
                BuildString += "\tpermissions 0\n";
                BuildString += "\t{\n";
            }

            public void AddSectionEnd()
            {
                BuildString += "\t}\n";
            }

            public void AddLine(string addLine)
            {
                BuildString += addLine;
            }

            public void AddNameValueLine(string name, string value)
            {
                BuildString += "\t\t";
                BuildString += name + "\t";
                BuildString += value + "\n";
            }

            public void Close()
            {
            }
        }        
    }
}