// 
// Radegast Metaverse Client
// Copyright (c) 2009-2014, Radegast Development Team
// All rights reserved.
// 
// 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 application "Radegast", 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR 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.
//
// $Id$
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Disk;
//using System.Reflection;
using OpenMetaverse;
using OpenMetaverse.StructuredData;
using UnityEngine.Assertions;

namespace Raindrop
{
    public class Grid
    {
        public string ID = string.Empty;
        public string Name = string.Empty;
        public string Platform = string.Empty;
        public string LoginURI = string.Empty;
        public string LoginPage = string.Empty;
        public string HelperURI = string.Empty;
        public string Website = string.Empty;
        public string Support = string.Empty;
        public string Register = string.Empty;
        public string PasswordURL = string.Empty;
        public string Version = "1";

        public Grid() { }

        public Grid(string ID, string name, string loginURI)
        {
            this.ID = ID;
            this.Name = name;
            this.LoginURI = loginURI;
        }

        public override string ToString()
        {
            return Name;
        }

        public static Grid FromOSD(OSD data)
        {
            if (data == null || data.Type != OSDType.Map) return null;
            Grid grid = new Grid();
            OSDMap map = (OSDMap)data;

            grid.ID = map["gridnick"].AsString();
            grid.Name = map["gridname"].AsString();
            grid.Platform = map["platform"].AsString();
            grid.LoginURI = map["loginuri"].AsString();
            grid.LoginPage = map["loginpage"].AsString();
            grid.HelperURI = map["helperuri"].AsString();
            grid.Website = map["website"].AsString();
            grid.Support = map["support"].AsString();
            grid.Register = map["register"].AsString();
            grid.PasswordURL = map["password"].AsString();
            grid.Version = map["version"].AsString();

            return grid;
        }
        
        public static OSD ToOSD(Grid grid)
        {
            OSDMap map = new OSDMap();

            map["gridnick"] = grid.ID;
            map["gridname"] = grid.Name;
            map["platform"] = grid.Platform;
            map["loginuri"] = grid.LoginURI;
            map["loginpage"] = grid.LoginPage;
            map["helperuri"] = grid.HelperURI;
            map["website"] = grid.Website;
            map["support"] = grid.Support;
            map["register"] = grid.Register;
            map["password"] = grid.PasswordURL;
            map["version"] = grid.Version;

            return map;
        }
    }

    /*
     * Grid.xml manager + reader/writer class.
     * user-accessible grids_custom.xml file replaces entries in the packaged grids.xml
     */
    public class GridManager : IDisposable
    {
        public List<Grid> Grids; //list to hold all grids, default or custom.
        public List<Grid> CustomGrids; //special list to hold only those that are custom. required to perform save-to-disk operation later.
        private string gridsFileCustom = "grids_custom.xml";
        private string gridsFileDefault = "grids.xml";
        private readonly string dataDir;

        // _appDataDir: the folder of the 2 grid xml files.
        public GridManager(string _appDataDir)
        {
            dataDir = _appDataDir;
            Grids = new List<Grid>();
            CustomGrids = new List<Grid>();
            
            LoadDefaultGrids(dataDir);
            LoadCustomGrids(dataDir);
        }

        public void Dispose()
        {
        }

        // load default, hard-coded list of grids.
        public void LoadDefaultGrids(string datadir)
        {
            Grids.Clear();
            Grids.Add(new Grid("agni", "Second Life (agni)", "https://login.agni.lindenlab.com/cgi-bin/login.cgi"));
            Grids.Add(new Grid("aditi", "Second Life Beta (aditi)", "https://login.aditi.lindenlab.com/cgi-bin/login.cgi"));

            try
            {
                string sysGridsFile = Path.Combine(datadir, gridsFileDefault);
                OSDArray sysGrids = (OSDArray)OSDParser.DeserializeLLSDXml(File.ReadAllText(sysGridsFile));
                for (int i = 0; i < sysGrids.Count; i++)
                {
                    RegisterGrid(Grid.FromOSD(sysGrids[i]));
                }
            }
            catch (Exception ex)
            {
                Logger.Log(string.Format("Error loading grid information: {0}", ex.Message), Helpers.LogLevel.Warning);
            }
        }
        
        //save the current instance into the grids.xml file
        public void SaveCustomGrids(string datadir)
        {
            try
            {
                OSDArray customGrids = new OSDArray();
                foreach (var grid in CustomGrids)
                {
                    var item = Grid.ToOSD(grid);
                    customGrids.Add(item);
                }

                // var bytesToWrite = OSDParser.SerializeLLSDXmlBytes(customGrids);
                // string customGridsFile = Path.Combine(datadir, gridsFileCustom);
                // DirectoryHelpers.WriteToFile(bytesToWrite, customGridsFile);

                string customGridsFile = Path.Combine(datadir, gridsFileCustom);
                string toWrite = OSDParser.SerializeLLSDXmlString(customGrids);
                DirectoryHelpers.WriteToFile(toWrite, customGridsFile);

            }
            catch (Exception ex)
            {
                Logger.Log(string.Format("Error saving custom grids information: {0}", ex.Message), Helpers.LogLevel.Warning);
            }
        }

        //add grid to list of grids, while overwriting if same-ID is already present.
        public void RegisterGrid(Grid grid)
        {
            int ix = Grids.FindIndex((Grid g) => { return g.ID == grid.ID; });
            if (ix < 0)
            {
                Grids.Add(grid);
            }
            else
            {
                Grids[ix] = grid;
            }
        }
        
        //add custom-grid to list of grids, while overwriting if same-ID is already present.
        //add custom-grid to custom grid-list, while overwriting if same-ID is already present.
        // update disk's custom grid.xml with new grid.
        public void RegisterCustomGrid(Grid grid)
        {
            //1. replace if any duplicates in custom list
            int ix = CustomGrids.FindIndex((Grid g) => { return g.ID == grid.ID; });
            if (ix < 0)
            {
                CustomGrids.Add(grid);
            }
            else
            {
                CustomGrids[ix] = grid;
            }
            
            //2. replace if any duplicates in main list.
            
            ix = Grids.FindIndex((Grid g) => { return g.ID == grid.ID; });
            if (ix < 0)
            {
                Grids.Add(grid);
            }
            else
            {
                Grids[ix] = grid;
            }
            
            //3. perform write to disk
            SaveCustomGrids(dataDir);
        }

        public Grid this[int ix]
        {
            get { return Grids[ix]; }
        }

        public Grid this[string gridID]
        {
            get
            {
                foreach (Grid grid in Grids)
                {
                    if (grid.ID == gridID) return grid;
                }
                throw new KeyNotFoundException();
            }
        }

        public bool KeyExists(string gridID)
        {
            foreach (Grid grid in Grids)
            {
                if (grid.ID == gridID) return true;
            }
            return false;
        }

        public int Count
        {
            get { return Grids.Count; }
        }

        //load custom grids, and overwrite any dupes in $List<Grids> 
        public void LoadCustomGrids(string datadir)
        {
            CustomGrids.Clear();
            
            //create blank custom_grids.xml file if not exists.
            string sysGridsFile = Path.Combine(datadir, gridsFileCustom);
            if (!File.Exists(sysGridsFile))
            {
                SaveCustomGrids(datadir);
                return;
            }
            
            try
            {
                OSDArray sysGrids = (OSDArray)OSDParser.DeserializeLLSDXml(File.ReadAllText(sysGridsFile));
                for (int i = 0; i < sysGrids.Count; i++)
                {
                    RegisterCustomGrid(Grid.FromOSD(sysGrids[i]));
                }
            }
            catch (Exception ex)
            {
                Logger.Log(string.Format("Error loading custom grid information: {0}", ex.Message), Helpers.LogLevel.Warning);
            }
        }

        //remove from custom grid xml. update disk.
        public void UnregisterGrid(int foundGridIdx)
        {
            CustomGrids.RemoveAt(foundGridIdx);
            SaveCustomGrids(dataDir);
        }
    }
}