using CodeWalker.GameFiles;
using CodeWalker.World;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace CodeWalker.Project
{
    public class ProjectFile
    {
        //fields stored in file
        public string Name { get; set; } //friendly name for this project
        public int Version { get; set; }
        public List<string> YmapFilenames { get; set; } = new List<string>();
        public List<string> YtypFilenames { get; set; } = new List<string>();
        public List<string> YndFilenames { get; set; } = new List<string>();
        public List<string> YnvFilenames { get; set; } = new List<string>();
        public List<string> TrainsFilenames { get; set; } = new List<string>();
        public List<string> ScenarioFilenames { get; set; } = new List<string>();
        public List<string> AudioRelFilenames { get; set; } = new List<string>();

        //fields not stored
        public string Filename { get; set; } //filename without path
        public string Filepath { get; set; } //full path of the current file
        public bool HasChanged { get; set; } //flag for use by the UI

        public List<YmapFile> YmapFiles { get; set; } = new List<YmapFile>();
        public List<YtypFile> YtypFiles { get; set; } = new List<YtypFile>();
        public List<YndFile> YndFiles { get; set; } = new List<YndFile>();
        public List<YnvFile> YnvFiles { get; set; } = new List<YnvFile>();
        public List<TrainTrack> TrainsFiles { get; set; } = new List<TrainTrack>();
        public List<YmtFile> ScenarioFiles { get; set; } = new List<YmtFile>();
        public List<RelFile> AudioRelFiles { get; set; } = new List<RelFile>();



        public void Save()
        {
            XmlDocument doc = new XmlDocument();
            var projelem = doc.CreateElement("CodeWalkerProject");
            doc.AppendChild(projelem);

            Xml.AddChildWithInnerText(doc, projelem, "Name", Name);
            Xml.AddChildWithAttribute(doc, projelem, "Version", "value", Version.ToString());

            var ymapselem = Xml.AddChild(doc, projelem, "YmapFilenames");
            foreach (string ymapfilename in YmapFilenames)
            {
                Xml.AddChildWithInnerText(doc, ymapselem, "Item", ymapfilename);
            }

            var ytypselem = Xml.AddChild(doc, projelem, "YtypFilenames");
            foreach (string ytypfilename in YtypFilenames)
            {
                Xml.AddChildWithInnerText(doc, ytypselem, "Item", ytypfilename);
            }


            var yndselem = Xml.AddChild(doc, projelem, "YndFilenames");
            foreach (string yndfilename in YndFilenames)
            {
                Xml.AddChildWithInnerText(doc, yndselem, "Item", yndfilename);
            }

            var ynvselem = Xml.AddChild(doc, projelem, "YnvFilenames");
            foreach (string ynvfilename in YnvFilenames)
            {
                Xml.AddChildWithInnerText(doc, ynvselem, "Item", ynvfilename);
            }

            var trainselem = Xml.AddChild(doc, projelem, "TrainsFilenames");
            foreach (string trainsfile in TrainsFilenames)
            {
                Xml.AddChildWithInnerText(doc, trainselem, "Item", trainsfile);
            }

            var scenarioselem = Xml.AddChild(doc, projelem, "ScenarioFilenames");
            foreach (string scenariofilename in ScenarioFilenames)
            {
                Xml.AddChildWithInnerText(doc, scenarioselem, "Item", scenariofilename);
            }

            var audiorelselem = Xml.AddChild(doc, projelem, "AudioRelFilenames");
            foreach (string audiorelfilename in AudioRelFilenames)
            {
                Xml.AddChildWithInnerText(doc, audiorelselem, "Item", audiorelfilename);
            }

            doc.Save(Filepath);
        }

        public void Load(string filepath)
        {
            FileInfo fi = new FileInfo(filepath);
            Filename = fi.Name;
            Filepath = filepath;

            XmlDocument doc = new XmlDocument();
            doc.Load(filepath);

            var projelem = doc.DocumentElement;

            Name = Xml.GetChildInnerText(projelem, "Name");
            Version = Xml.GetChildIntAttribute(projelem, "Version", "value");

            YmapFilenames.Clear();
            YmapFiles.Clear();
            var ymapselem = Xml.GetChild(projelem, "YmapFilenames");
            if (ymapselem != null)
            {
                foreach (var node in ymapselem.SelectNodes("Item"))
                {
                    XmlElement ymapel = node as XmlElement;
                    if (ymapel != null)
                    {
                        AddYmapFile(ymapel.InnerText);
                    }
                }
            }


            YtypFilenames.Clear();
            YtypFiles.Clear();
            var ytypselem = Xml.GetChild(projelem, "YtypFilenames");
            if (ytypselem != null)
            {
                foreach (var node in ytypselem.SelectNodes("Item"))
                {
                    XmlElement ytypel = node as XmlElement;
                    if (ytypel != null)
                    {
                        AddYtypFile(ytypel.InnerText);
                    }
                }
            }


            YndFilenames.Clear();
            YndFiles.Clear();
            var yndselem = Xml.GetChild(projelem, "YndFilenames");
            if (yndselem != null)
            {
                foreach (var node in yndselem.SelectNodes("Item"))
                {
                    XmlElement yndel = node as XmlElement;
                    if (yndel != null)
                    {
                        AddYndFile(yndel.InnerText);
                    }
                }
            }



            YnvFilenames.Clear();
            YnvFiles.Clear();
            var ynvselem = Xml.GetChild(projelem, "YnvFilenames");
            if (ynvselem != null)
            {
                foreach (var node in ynvselem.SelectNodes("Item"))
                {
                    XmlElement ynvel = node as XmlElement;
                    if (ynvel != null)
                    {
                        AddYnvFile(ynvel.InnerText);
                    }
                }
            }


            TrainsFilenames.Clear();
            TrainsFiles.Clear();
            var trainsselem = Xml.GetChild(projelem, "TrainsFilenames");
            if (trainsselem != null)
            {
                foreach (var node in trainsselem.SelectNodes("Item"))
                {
                    XmlElement trainel = node as XmlElement;
                    if (trainel != null)
                    {
                        AddTrainsFile(trainel.InnerText);
                    }
                }
            }



            ScenarioFilenames.Clear();
            ScenarioFiles.Clear();
            var scenarioselem = Xml.GetChild(projelem, "ScenarioFilenames");
            if (scenarioselem != null)
            {
                foreach (var node in scenarioselem.SelectNodes("Item"))
                {
                    XmlElement scenarioel = node as XmlElement;
                    if (scenarioel != null)
                    {
                        AddScenarioFile(scenarioel.InnerText);
                    }
                }
            }



            AudioRelFilenames.Clear();
            AudioRelFiles.Clear();
            var audiorelselem = Xml.GetChild(projelem, "AudioRelFilenames");
            if (audiorelselem != null)
            {
                foreach (var node in audiorelselem.SelectNodes("Item"))
                {
                    XmlElement audiorelel = node as XmlElement;
                    if (audiorelel != null)
                    {
                        AddAudioRelFile(audiorelel.InnerText);
                    }
                }
            }

        }


        public void UpdateFilenames(string oldprojpath)
        {
            for (int i = 0; i < YmapFilenames.Count; i++)
            {
                YmapFilenames[i] = GetUpdatedFilePath(YmapFilenames[i], oldprojpath);
            }
            for (int i = 0; i < YtypFilenames.Count; i++)
            {
                YtypFilenames[i] = GetUpdatedFilePath(YtypFilenames[i], oldprojpath);
            }
            for (int i = 0; i < YndFilenames.Count; i++)
            {
                YndFilenames[i] = GetUpdatedFilePath(YndFilenames[i], oldprojpath);
            }
            for (int i = 0; i < YnvFilenames.Count; i++)
            {
                YnvFilenames[i] = GetUpdatedFilePath(YnvFilenames[i], oldprojpath);
            }
            for (int i = 0; i < TrainsFilenames.Count; i++)
            {
                TrainsFilenames[i] = GetUpdatedFilePath(TrainsFilenames[i], oldprojpath);
            }
            for (int i = 0; i < ScenarioFilenames.Count; i++)
            {
                ScenarioFilenames[i] = GetUpdatedFilePath(ScenarioFilenames[i], oldprojpath);
            }
            for (int i = 0; i < AudioRelFilenames.Count; i++)
            {
                AudioRelFilenames[i] = GetUpdatedFilePath(AudioRelFilenames[i], oldprojpath);
            }
        }

        public string GetUpdatedFilePath(string oldpath, string oldprojpath)
        {
            string fullpath = GetFullFilePath(oldpath, oldprojpath);
            string newpath = GetRelativePath(fullpath);
            return newpath;
        }
        public string GetRelativePath(string filepath)
        {
            if (filepath == null) return string.Empty;
            if (Filepath == null) return filepath;

            Uri fromUri;
            if (!Uri.TryCreate(Filepath, UriKind.RelativeOrAbsolute, out fromUri))
            {
                return filepath;
            }

            Uri toUri;
            if (!Uri.TryCreate(filepath, UriKind.RelativeOrAbsolute, out toUri))
            {
                return filepath;
            }
            if (!toUri.IsAbsoluteUri)
            {
                return filepath;//already relative...
            }

            //Uri fromUri = new Uri(Filepath);
            //Uri toUri = new Uri(filepath);
            if (fromUri.Scheme != toUri.Scheme)
            {
                return filepath.ToLowerInvariant();
            }
            Uri relativeUri = fromUri.MakeRelativeUri(toUri);
            string relativePath = Uri.UnescapeDataString(relativeUri.ToString());
            if (string.Equals(toUri.Scheme, Uri.UriSchemeFile, StringComparison.OrdinalIgnoreCase))
            {
                relativePath = relativePath.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);
            }
            return relativePath.ToLowerInvariant();
        }
        public string GetFullFilePath(string relpath)
        {
            if (string.IsNullOrEmpty(Filepath)) return relpath;
            string projfldr = new FileInfo(Filepath).DirectoryName + "\\";
            string cpath = Path.Combine(projfldr, relpath);
            string apath = Path.GetFullPath(cpath);
            return apath;
        }
        public string GetFullFilePath(string relpath, string basepath)
        {
            if (string.IsNullOrEmpty(basepath)) return relpath;
            string basefldr = new FileInfo(basepath).DirectoryName + "\\";
            string cpath = Path.Combine(basefldr, relpath);
            string apath = Path.GetFullPath(cpath);
            return apath;
        }



        public YmapFile AddYmapFile(string filename)
        {
            YmapFile ymap = new YmapFile();
            ymap.RpfFileEntry = new RpfResourceFileEntry();
            ymap.RpfFileEntry.Name = Path.GetFileName(filename);
            ymap.FilePath = GetFullFilePath(filename);
            ymap.Name = ymap.RpfFileEntry.Name;
            JenkIndex.Ensure(ymap.Name);
            JenkIndex.Ensure(Path.GetFileNameWithoutExtension(ymap.Name));
            JenkIndex.Ensure(filename);
            if (!AddYmapFile(ymap)) return null;
            return ymap;
        }
        public bool AddYmapFile(YmapFile ymap)
        {
            string relpath = GetRelativePath(ymap.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ymap.Name;
            if (YmapFilenames.Contains(relpath)) return false;
            YmapFilenames.Add(relpath);
            YmapFiles.Add(ymap);
            return true;
        }
        public void RemoveYmapFile(YmapFile ymap)
        {
            if (ymap == null) return;
            var relpath = GetRelativePath(ymap.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ymap.Name;
            YmapFiles.Remove(ymap);
            YmapFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsYmap(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var ymapfn in YmapFilenames)
            {
                if (ymapfn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsYmap(YmapFile ymap)
        {
            foreach (var f in YmapFiles)
            {
                if (f == ymap) return true;
            }
            return false;
        }
        public bool RenameYmap(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < YmapFilenames.Count; i++)
            {
                if (YmapFilenames[i] == oldfilename)
                {
                    YmapFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


        public YtypFile AddYtypFile(string filename)
        {
            YtypFile ytyp = new YtypFile();
            ytyp.RpfFileEntry = new RpfResourceFileEntry();
            ytyp.RpfFileEntry.Name = Path.GetFileName(filename);
            ytyp.FilePath = GetFullFilePath(filename);
            ytyp.Name = ytyp.RpfFileEntry.Name;
            JenkIndex.Ensure(ytyp.Name);
            JenkIndex.Ensure(Path.GetFileNameWithoutExtension(ytyp.Name));
            JenkIndex.Ensure(filename);
            if (!AddYtypFile(ytyp)) return null;
            return ytyp;
        }
        public bool AddYtypFile(YtypFile ytyp)
        {
            string relpath = GetRelativePath(ytyp.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ytyp.Name;
            if (YtypFilenames.Contains(relpath)) return false;
            YtypFilenames.Add(relpath);
            YtypFiles.Add(ytyp);
            return true;
        }
        public void RemoveYtypFile(YtypFile ytyp)
        {
            if (ytyp == null) return;
            var relpath = GetRelativePath(ytyp.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ytyp.Name;
            YtypFiles.Remove(ytyp);
            YtypFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsYtyp(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var ytypfn in YtypFilenames)
            {
                if (ytypfn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsYtyp(YtypFile ytyp)
        {
            foreach (var f in YtypFiles)
            {
                if (f == ytyp) return true;
            }
            return false;
        }
        public bool RenameYtyp(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < YtypFilenames.Count; i++)
            {
                if (YtypFilenames[i] == oldfilename)
                {
                    YtypFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


        public YndFile AddYndFile(string filename)
        {
            YndFile ynd = new YndFile();
            ynd.RpfFileEntry = new RpfResourceFileEntry();
            ynd.RpfFileEntry.Name = Path.GetFileName(filename);
            ynd.FilePath = GetFullFilePath(filename);
            ynd.Name = ynd.RpfFileEntry.Name;
            if (!AddYndFile(ynd)) return null;
            return ynd;
        }
        public bool AddYndFile(YndFile ynd)
        {
            string relpath = GetRelativePath(ynd.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ynd.Name;
            if (YndFilenames.Contains(relpath)) return false;
            YndFilenames.Add(relpath);
            YndFiles.Add(ynd);
            return true;
        }
        public void RemoveYndFile(YndFile ynd)
        {
            if (ynd == null) return;
            var relpath = GetRelativePath(ynd.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ynd.Name;
            YndFiles.Remove(ynd);
            YndFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsYnd(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var yndfn in YndFilenames)
            {
                if (yndfn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsYnd(YndFile ynd)
        {
            foreach (var f in YndFiles)
            {
                if (f == ynd) return true;
            }
            return false;
        }
        public bool RenameYnd(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < YndFilenames.Count; i++)
            {
                if (YndFilenames[i] == oldfilename)
                {
                    YndFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


        public YnvFile AddYnvFile(string filename)
        {
            YnvFile ynv = new YnvFile();
            ynv.RpfFileEntry = new RpfResourceFileEntry();
            ynv.RpfFileEntry.Name = Path.GetFileName(filename);
            ynv.FilePath = GetFullFilePath(filename);
            ynv.Name = ynv.RpfFileEntry.Name;
            if (!AddYnvFile(ynv)) return null;
            return ynv;
        }
        public bool AddYnvFile(YnvFile ynv)
        {
            string relpath = GetRelativePath(ynv.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ynv.Name;
            if (YnvFilenames.Contains(relpath)) return false;
            YnvFilenames.Add(relpath);
            YnvFiles.Add(ynv);
            return true;
        }
        public void RemoveYnvFile(YnvFile ynv)
        {
            if (ynv == null) return;
            var relpath = GetRelativePath(ynv.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ynv.Name;
            YnvFiles.Remove(ynv);
            YnvFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsYnv(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var ynvfn in YnvFilenames)
            {
                if (ynvfn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsYnv(YnvFile ynv)
        {
            foreach (var f in YnvFiles)
            {
                if (f == ynv) return true;
            }
            return false;
        }
        public bool RenameYnv(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < YnvFilenames.Count; i++)
            {
                if (YnvFilenames[i] == oldfilename)
                {
                    YnvFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


        public TrainTrack AddTrainsFile(string filename)
        {
            TrainTrack track = new TrainTrack();
            track.RpfFileEntry = new RpfResourceFileEntry();
            track.RpfFileEntry.Name = Path.GetFileName(filename);
            track.FilePath = GetFullFilePath(filename);
            track.Name = track.RpfFileEntry.Name;
            if (!AddTrainsFile(track)) return null;
            return track;
        }
        public bool AddTrainsFile(TrainTrack track)
        {
            string relpath = GetRelativePath(track.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = track.Name;
            if (TrainsFilenames.Contains(relpath)) return false;
            TrainsFilenames.Add(relpath);
            TrainsFiles.Add(track);
            return true;
        }
        public void RemoveTrainsFile(TrainTrack track)
        {
            if (track == null) return;
            var relpath = GetRelativePath(track.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = track.Name;
            TrainsFiles.Remove(track);
            TrainsFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsTrainTrack(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var trainsfn in TrainsFilenames)
            {
                if (trainsfn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsTrainTrack(TrainTrack track)
        {
            foreach (var f in TrainsFiles)
            {
                if (f == track) return true;
            }
            return false;
        }
        public bool RenameTrainTrack(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < TrainsFilenames.Count; i++)
            {
                if (TrainsFilenames[i] == oldfilename)
                {
                    TrainsFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


        public YmtFile AddScenarioFile(string filename)
        {
            YmtFile scenario = new YmtFile();
            scenario.RpfFileEntry = new RpfResourceFileEntry();
            scenario.RpfFileEntry.Name = Path.GetFileName(filename);
            scenario.FilePath = GetFullFilePath(filename);
            scenario.Name = scenario.RpfFileEntry.Name;
            scenario.ContentType = YmtFileContentType.ScenarioPointRegion;
            scenario.FileFormat = YmtFileFormat.RSC;
            if (!AddScenarioFile(scenario)) return null;
            return scenario;
        }
        public bool AddScenarioFile(YmtFile ymt)
        {
            string relpath = GetRelativePath(ymt.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ymt.Name;
            if (ScenarioFilenames.Contains(relpath)) return false;
            ScenarioFilenames.Add(relpath);
            ScenarioFiles.Add(ymt);
            return true;
        }
        public void RemoveScenarioFile(YmtFile ymt)
        {
            if (ymt == null) return;
            var relpath = GetRelativePath(ymt.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = ymt.Name;
            ScenarioFiles.Remove(ymt);
            ScenarioFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsScenario(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var scenariofn in ScenarioFilenames)
            {
                if (scenariofn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsScenario(YmtFile ymt)
        {
            foreach (var f in ScenarioFiles)
            {
                if (f == ymt) return true;
            }
            return false;
        }
        public bool RenameScenario(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < ScenarioFilenames.Count; i++)
            {
                if (ScenarioFilenames[i] == oldfilename)
                {
                    ScenarioFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


        public RelFile AddAudioRelFile(string filename)
        {
            RelFile relfile = new RelFile();
            relfile.RpfFileEntry = new RpfResourceFileEntry();
            relfile.RpfFileEntry.Name = Path.GetFileName(filename);
            relfile.RpfFileEntry.NameHash = JenkHash.GenHash(relfile.RpfFileEntry.Name);
            relfile.FilePath = GetFullFilePath(filename);
            relfile.Name = relfile.RpfFileEntry.Name;
            if (!AddAudioRelFile(relfile)) return null;
            return relfile;
        }
        public bool AddAudioRelFile(RelFile rel)
        {
            string relpath = GetRelativePath(rel.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = rel.Name;
            if (AudioRelFilenames.Contains(relpath)) return false;
            AudioRelFilenames.Add(relpath);
            AudioRelFiles.Add(rel);
            return true;
        }
        public void RemoveAudioRelFile(RelFile rel)
        {
            if (rel == null) return;
            var relpath = GetRelativePath(rel.FilePath);
            if (string.IsNullOrEmpty(relpath)) relpath = rel.Name;
            AudioRelFiles.Remove(rel);
            AudioRelFilenames.Remove(relpath);
            HasChanged = true;
        }
        public bool ContainsAudioRel(string filename)
        {
            bool found = false;
            filename = filename.ToLowerInvariant();
            foreach (var audiorelfn in AudioRelFilenames)
            {
                if (audiorelfn == filename)
                {
                    found = true;
                    break;
                }
            }
            return found;
        }
        public bool ContainsAudioRel(RelFile rel)
        {
            foreach (var f in AudioRelFiles)
            {
                if (f == rel) return true;
            }
            return false;
        }
        public bool RenameAudioRel(string oldfilename, string newfilename)
        {
            oldfilename = oldfilename.ToLowerInvariant();
            newfilename = newfilename.ToLowerInvariant();
            for (int i = 0; i < AudioRelFilenames.Count; i++)
            {
                if (AudioRelFilenames[i] == oldfilename)
                {
                    AudioRelFilenames[i] = newfilename;
                    HasChanged = true;
                    return true;
                }
            }
            return false;
        }


    }
}