/*
Title:    CueSharp
Version:  0.5
Released: March 24, 2007

Author:   Wyatt O'Day
Website:  wyday.com/cuesharp
*/

// MK: fixes to substring processing

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace CueSharp_N
{
    /// <summary>
    /// A CueSheet class used to create, open, edit, and save cuesheets.
    /// </summary>
    public class CueSheet
    {
        #region Private Variables

        private string[] cueLines;

        private string m_Catalog = "";
        private string m_CDTextFile = "";
        private string[] m_Comments = new string[0];

        // strings that don't belong or were mistyped in the global part of the cue
        private string[] m_Garbage = new string[0];

        private string m_Performer = "";
        private string m_Songwriter = "";
        private string m_Title = "";
        private Track[] m_Tracks = new Track[0];

        #endregion Private Variables

        #region Properties

        /// <summary>
        /// Returns/Sets track in this cuefile.
        /// </summary>
        /// <param name="tracknumber">The track in this cuefile.</param>
        /// <returns>Track at the tracknumber.</returns>
        public Track this[int tracknumber]
        {
            get { return m_Tracks[tracknumber]; }
            set { m_Tracks[tracknumber] = value; }
        }

        /// <summary>
        /// The catalog number must be 13 digits long and is encoded according to UPC/EAN rules.
        /// Example: CATALOG 1234567890123
        /// </summary>
        public string Catalog
        {
            get { return m_Catalog; }
            set { m_Catalog = value; }
        }

        /// <summary>
        /// This command is used to specify the name of the file that contains the encoded CD-TEXT information for the disc. This command is only used with files that were either created with the graphical CD-TEXT editor or generated automatically by the software when copying a CD-TEXT enhanced disc.
        /// </summary>
        public string CDTextFile
        {
            get { return m_CDTextFile; }
            set { m_CDTextFile = value; }
        }

        /// <summary>
        /// This command is used to put comments in your CUE SHEET file.
        /// </summary>
        public string[] Comments
        {
            get { return m_Comments; }
            set { m_Comments = value; }
        }

        /// <summary>
        /// Lines in the cue file that don't belong or have other general syntax errors.
        /// </summary>
        public string[] Garbage
        {
            get { return m_Garbage; }
        }

        /// <summary>
        /// This command is used to specify the name of a perfomer for a CD-TEXT enhanced disc.
        /// </summary>
        public string Performer
        {
            get { return m_Performer; }
            set { m_Performer = value; }
        }

        /// <summary>
        /// This command is used to specify the name of a songwriter for a CD-TEXT enhanced disc.
        /// </summary>
        public string Songwriter
        {
            get { return m_Songwriter; }
            set { m_Songwriter = value; }
        }

        /// <summary>
        /// The title of the entire disc as a whole.
        /// </summary>
        public string Title
        {
            get { return m_Title; }
            set { m_Title = value; }
        }

        /// <summary>
        /// The array of tracks on the cuesheet.
        /// </summary>
        public Track[] Tracks
        {
            get { return m_Tracks; }
            set { m_Tracks = value; }
        }

        #endregion Properties

        #region Constructors

        /// <summary>
        /// Create a cue sheet from scratch.
        /// </summary>
        public CueSheet()
        { }

        /// <summary>
        /// Parse a cue sheet string.
        /// </summary>
        /// <param name="cueString">A string containing the cue sheet data.</param>
        /// <param name="lineDelims">Line delimeters; set to "(char[])null" for default delimeters.</param>
        public CueSheet(string cueString, char[] lineDelims)
        {
            if (lineDelims == null)
            {
                lineDelims = new char[] { '\n' };
            }

            cueLines = RemoveEmptyLines(cueString.Split(lineDelims));
            ParseCue(cueLines);
        }

        /// <summary>
        /// Parses a cue sheet file.
        /// </summary>
        /// <param name="cuefilename">The filename for the cue sheet to open.</param>
        public CueSheet(string cuefilename)
        {
            ReadCueSheet(cuefilename, Encoding.Default);
        }

        /// <summary>
        /// Parses a cue sheet file.
        /// </summary>
        /// <param name="cuefilename">The filename for the cue sheet to open.</param>
        /// <param name="encoding">The encoding used to open the file.</param>
        public CueSheet(string cuefilename, Encoding encoding)
        {
            ReadCueSheet(cuefilename, encoding);
        }

        /// <summary>
        /// Parses a cue sheet file.
        /// </summary>
        /// <param name="file">The text stream for the cue sheet to read.</param>
        public CueSheet(StreamReader file)
        {
            ReadCueSheet(file);
        }

        private void ReadCueSheet(StreamReader file)
        {
            // array of delimiters to split the sentence with
            char[] delimiters = new char[] { '\n' };

            //read in file
            cueLines = RemoveEmptyLines(file.ReadToEnd().Split(delimiters));

            ParseCue(cueLines);
        }

        private void ReadCueSheet(string filename, Encoding encoding)
        {
            // array of delimiters to split the sentence with
            char[] delimiters = new char[] { '\n' };

            // read in the full cue file
            using (TextReader tr = new StreamReader(filename, encoding))
            {
                //read in file
                cueLines = RemoveEmptyLines(tr.ReadToEnd().Split(delimiters));
            }

            ParseCue(cueLines);
        }

        #endregion Constructors

        #region Methods

        /// <summary>
        /// Trims leading and trailing spaces, removes any empty lines, elimating possible trouble.
        /// </summary>
        /// <param name="file"></param>
        private string[] RemoveEmptyLines(string[] file)
        {
            return file.Select(line => line.Trim()).Where(line => line != string.Empty).ToArray();
        }

        private void ParseCue(string[] file)
        {
            //-1 means still global,
            //all others are track specific
            int trackOn = -1;
            AudioFile currentFile = new AudioFile();

            foreach (var line in file)
            {
                var kv = SplitLine(line);

                switch (kv.Key)
                {
                    case "CATALOG":
                        ParseString(kv.Key, kv.Value, trackOn);
                        break;

                    case "CDTEXTFILE":
                        ParseString(kv.Key, kv.Value, trackOn);
                        break;

                    case "FILE":
                        currentFile = ParseFile(kv.Value, trackOn);
                        break;

                    case "FLAGS":
                        ParseFlags(line, trackOn);
                        break;

                    case "INDEX":
                        ParseIndex(kv.Key, kv.Value, trackOn);
                        break;

                    case "ISRC":
                        ParseString(kv.Key, kv.Value, trackOn);
                        break;

                    case "PERFORMER":
                        ParseString(kv.Key, kv.Value, trackOn);
                        break;

                    case "POSTGAP":
                        ParseIndex(kv.Key, kv.Value, trackOn);
                        break;

                    case "PREGAP":
                        ParseIndex(kv.Key, kv.Value, trackOn);
                        break;

                    case "REM":
                        ParseComment(kv.Value, trackOn);
                        break;

                    case "SONGWRITER":
                        ParseString(kv.Key, kv.Value, trackOn);
                        break;

                    case "TITLE":
                        ParseString(kv.Key, kv.Value, trackOn);
                        break;

                    case "TRACK":
                        trackOn++;
                        ParseTrack(kv.Value, trackOn);
                        if (currentFile.Filename != "") //if there's a file
                        {
                            m_Tracks[trackOn].DataFile = currentFile;
                            currentFile = new AudioFile();
                        }
                        break;

                    default:
                        ParseGarbage(line, trackOn);
                        //save discarded junk and place string[] with track it was found in
                        break;
                }
            }
        }

        private void ParseComment(string line, int trackOn)
        {
            // "REM" already removed

            if (trackOn == -1)
            {
                if (line.Trim() != "")
                {
                    m_Comments = (string[])ResizeArray(m_Comments, m_Comments.Length + 1);
                    m_Comments[m_Comments.Length - 1] = line;
                }
            }
            else
            {
                m_Tracks[trackOn].AddComment(line);
            }
        }

        private AudioFile ParseFile(string line, int trackOn)
        {
            string fileType = line.Substring(line.LastIndexOf(' '), line.Length - line.LastIndexOf(' ')).Trim();

            line = line.Substring(0, line.LastIndexOf(' ')).Trim();

            //if quotes around it, remove them.
            if (line[0] == '"')
            {
                line = line.Substring(1, line.LastIndexOf('"') - 1);
            }

            return new AudioFile(line, fileType);
        }

        private void ParseFlags(string line, int trackOn)
        {
            string temp;

            if (trackOn != -1)
            {
                line = line.Trim();
                if (line != "")
                {
                    var pos = line.IndexOf(' ');
                    temp = (pos >= 0 ? line.Substring(0, pos) : line).ToUpper();

                    switch (temp)
                    {
                        case "FLAGS":
                            m_Tracks[trackOn].AddFlag(temp);
                            break;

                        case "DATA":
                            m_Tracks[trackOn].AddFlag(temp);
                            break;

                        case "DCP":
                            m_Tracks[trackOn].AddFlag(temp);
                            break;

                        case "4CH":
                            m_Tracks[trackOn].AddFlag(temp);
                            break;

                        case "PRE":
                            m_Tracks[trackOn].AddFlag(temp);
                            break;

                        case "SCMS":
                            m_Tracks[trackOn].AddFlag(temp);
                            break;

                        default:
                            break;
                    }

                    temp = pos >= 0 ? line.Substring(pos, line.Length - pos) : line;

                    //if the flag hasn't already been processed
                    if (temp.ToUpper().Trim() != line.ToUpper().Trim())
                    {
                        ParseFlags(temp, trackOn);
                    }
                }
            }
        }

        private void ParseGarbage(string line, int trackOn)
        {
            if (trackOn == -1)
            {
                if (line.Trim() != "")
                {
                    m_Garbage = (string[])ResizeArray(m_Garbage, m_Garbage.Length + 1);
                    m_Garbage[m_Garbage.Length - 1] = line;
                }
            }
            else
            {
                m_Tracks[trackOn].AddGarbage(line);
            }
        }

        private void ParseIndex(string indexType, string value, int trackOn)
        {
            string tempString;

            int number = 0;
            int minutes;
            int seconds;
            int frames;

            tempString = value;

            if (indexType == "INDEX")
            {
                //read the index number
                number = Convert.ToInt32(tempString.Substring(0, tempString.IndexOf(' ')));
                tempString = tempString.Substring(tempString.IndexOf(' '), tempString.Length - tempString.IndexOf(' ')).Trim();
            }

            //extract the minutes, seconds, and frames
            minutes = Convert.ToInt32(tempString.Substring(0, tempString.IndexOf(':')));
            seconds = Convert.ToInt32(tempString.Substring(tempString.IndexOf(':') + 1, tempString.LastIndexOf(':') - tempString.IndexOf(':') - 1));
            frames = Convert.ToInt32(tempString.Substring(tempString.LastIndexOf(':') + 1, tempString.Length - tempString.LastIndexOf(':') - 1));

            if (indexType == "INDEX")
            {
                m_Tracks[trackOn].AddIndex(number, minutes, seconds, frames);
            }
            else if (indexType == "PREGAP")
            {
                m_Tracks[trackOn].PreGap = new Index(0, minutes, seconds, frames);
            }
            else if (indexType == "POSTGAP")
            {
                m_Tracks[trackOn].PostGap = new Index(0, minutes, seconds, frames);
            }
        }

        private void ParseString(string category, string line, int trackOn)
        {
            //get rid of the quotes
            if (line[0] == '"')
            {
                line = line.Substring(1, line.LastIndexOf('"') - 1);
            }

            switch (category)
            {
                case "CATALOG":
                    if (trackOn == -1)
                    {
                        this.m_Catalog = line;
                    }
                    break;

                case "CDTEXTFILE":
                    if (trackOn == -1)
                    {
                        this.m_CDTextFile = line;
                    }
                    break;

                case "ISRC":
                    if (trackOn != -1)
                    {
                        m_Tracks[trackOn].ISRC = line;
                    }
                    break;

                case "PERFORMER":
                    if (trackOn == -1)
                    {
                        this.m_Performer = line;
                    }
                    else
                    {
                        m_Tracks[trackOn].Performer = line;
                    }
                    break;

                case "SONGWRITER":
                    if (trackOn == -1)
                    {
                        this.m_Songwriter = line;
                    }
                    else
                    {
                        m_Tracks[trackOn].Songwriter = line;
                    }
                    break;

                case "TITLE":
                    if (trackOn == -1)
                    {
                        this.m_Title = line;
                    }
                    else
                    {
                        m_Tracks[trackOn].Title = line;
                    }
                    break;

                default:
                    break;
            }
        }

        /// <summary>
        /// Parses the TRACK command.
        /// </summary>
        /// <param name="value">The line in the cue file that contains the TRACK command with TRACK part removed.</param>
        /// <param name="trackOn">The track currently processing.</param>
        private void ParseTrack(string value, int trackOn)
        {
            string tempString;
            int trackNumber;

            tempString = value;

            try
            {
                trackNumber = Convert.ToInt32(tempString.Substring(0, tempString.IndexOf(' ')));
            }
            catch (Exception)
            { throw; }

            //find the data type.
            tempString = tempString.Substring(tempString.IndexOf(' '), tempString.Length - tempString.IndexOf(' ')).Trim();

            AddTrack(trackNumber, tempString);
        }

        /// <summary>
        /// Reallocates an array with a new size, and copies the contents
        /// of the old array to the new array.
        /// </summary>
        /// <param name="oldArray">The old array, to be reallocated.</param>
        /// <param name="newSize">The new array size.</param>
        /// <returns>A new array with the same contents.</returns>
        /// <remarks >Useage: int[] a = {1,2,3}; a = (int[])ResizeArray(a,5);</remarks>
        public static System.Array ResizeArray(System.Array oldArray, int newSize)
        {
            int oldSize = oldArray.Length;
            System.Type elementType = oldArray.GetType().GetElementType();
            System.Array newArray = System.Array.CreateInstance(elementType, newSize);
            int preserveLength = System.Math.Min(oldSize, newSize);
            if (preserveLength > 0)
                System.Array.Copy(oldArray, newArray, preserveLength);
            return newArray;
        }

        /// <summary>
        /// Add a track to the current cuesheet.
        /// </summary>
        /// <param name="tracknumber">The number of the said track.</param>
        /// <param name="datatype">The datatype of the track.</param>
        private void AddTrack(int tracknumber, string datatype)
        {
            m_Tracks = (Track[])ResizeArray(m_Tracks, m_Tracks.Length + 1);
            m_Tracks[m_Tracks.Length - 1] = new Track(tracknumber, datatype);
        }

        /// <summary>
        /// Add a track to the current cuesheet
        /// </summary>
        /// <param name="title">The title of the track.</param>
        /// <param name="performer">The performer of this track.</param>
        public void AddTrack(string title, string performer)
        {
            m_Tracks = (Track[])ResizeArray(m_Tracks, m_Tracks.Length + 1);
            m_Tracks[m_Tracks.Length - 1] = new Track(m_Tracks.Length, "");

            m_Tracks[m_Tracks.Length - 1].Performer = performer;
            m_Tracks[m_Tracks.Length - 1].Title = title;
        }

        public void AddTrack(string title, string performer, string filename, FileType fType)
        {
            m_Tracks = (Track[])ResizeArray(m_Tracks, m_Tracks.Length + 1);
            m_Tracks[m_Tracks.Length - 1] = new Track(m_Tracks.Length, "");

            m_Tracks[m_Tracks.Length - 1].Performer = performer;
            m_Tracks[m_Tracks.Length - 1].Title = title;
            m_Tracks[m_Tracks.Length - 1].DataFile = new AudioFile(filename, fType);
        }

        /// <summary>
        /// Add a track to the current cuesheet
        /// </summary>
        /// <param name="title">The title of the track.</param>
        /// <param name="performer">The performer of this track.</param>
        /// <param name="datatype">The datatype for the track (typically DataType.Audio)</param>
        public void AddTrack(string title, string performer, DataType datatype)
        {
            m_Tracks = (Track[])ResizeArray(m_Tracks, m_Tracks.Length + 1);
            m_Tracks[m_Tracks.Length - 1] = new Track(m_Tracks.Length, datatype);

            m_Tracks[m_Tracks.Length - 1].Performer = performer;
            m_Tracks[m_Tracks.Length - 1].Title = title;
        }

        /// <summary>
        /// Add a track to the current cuesheet
        /// </summary>
        /// <param name="track">Track object to add to the cuesheet.</param>
        public void AddTrack(Track track)
        {
            m_Tracks = (Track[])ResizeArray(m_Tracks, m_Tracks.Length + 1);
            m_Tracks[m_Tracks.Length - 1] = track;
        }

        /// <summary>
        /// Remove a track from the cuesheet.
        /// </summary>
        /// <param name="trackIndex">The index of the track you wish to remove.</param>
        public void RemoveTrack(int trackIndex)
        {
            for (int i = trackIndex; i < m_Tracks.Length - 1; i++)
            {
                m_Tracks[i] = m_Tracks[i + 1];
            }
            m_Tracks = (Track[])ResizeArray(m_Tracks, m_Tracks.Length - 1);
        }

        /// <summary>
        /// Add index information to an existing track.
        /// </summary>
        /// <param name="trackIndex">The array index number of track to be modified</param>
        /// <param name="indexNum">The index number of the new index</param>
        /// <param name="minutes">The minute value of the new index</param>
        /// <param name="seconds">The seconds value of the new index</param>
        /// <param name="frames">The frames value of the new index</param>
        public void AddIndex(int trackIndex, int indexNum, int minutes, int seconds, int frames)
        {
            m_Tracks[trackIndex].AddIndex(indexNum, minutes, seconds, frames);
        }

        /// <summary>
        /// Remove an index from a track.
        /// </summary>
        /// <param name="trackIndex">The array-index of the track.</param>
        /// <param name="indexIndex">The index of the Index you wish to remove.</param>
        public void RemoveIndex(int trackIndex, int indexIndex)
        {
            //Note it is the index of the Index you want to delete,
            //which may or may not correspond to the number of the index.
            m_Tracks[trackIndex].RemoveIndex(indexIndex);
        }

        /// <summary>
        /// Save the cue sheet file to specified location.
        /// </summary>
        /// <param name="filename">Filename of destination cue sheet file.</param>
        public void SaveCue(string filename)
        {
            SaveCue(filename, Encoding.Default);
        }

        /// <summary>
        /// Save the cue sheet file to specified location.
        /// </summary>
        /// <param name="filename">Filename of destination cue sheet file.</param>
        /// <param name="encoding">The encoding used to save the file.</param>
        public void SaveCue(string filename, Encoding encoding)
        {
            using (TextWriter tw = new StreamWriter(filename, false, encoding))
                tw.WriteLine(this.ToString());
        }

        /// <summary>
        /// Method to output the cuesheet into a single formatted string.
        /// </summary>
        /// <returns>The entire cuesheet formatted to specification.</returns>
        public override string ToString()
        {
            StringBuilder output = new StringBuilder();

            foreach (string comment in m_Comments)
            {
                output.Append("REM " + comment + Environment.NewLine);
            }

            if (m_Catalog.Trim() != "")
            {
                output.Append("CATALOG " + m_Catalog + Environment.NewLine);
            }

            if (m_Performer.Trim() != "")
            {
                output.Append("PERFORMER \"" + m_Performer + "\"" + Environment.NewLine);
            }

            if (m_Songwriter.Trim() != "")
            {
                output.Append("SONGWRITER \"" + m_Songwriter + "\"" + Environment.NewLine);
            }

            if (m_Title.Trim() != "")
            {
                output.Append("TITLE \"" + m_Title + "\"" + Environment.NewLine);
            }

            if (m_CDTextFile.Trim() != "")
            {
                output.Append("CDTEXTFILE \"" + m_CDTextFile.Trim() + "\"" + Environment.NewLine);
            }

            for (int i = 0; i < m_Tracks.Length; i++)
            {
                output.Append(m_Tracks[i].ToString());

                if (i != m_Tracks.Length - 1)
                {
                    //add line break for each track except last
                    output.Append(Environment.NewLine);
                }
            }

            return output.ToString();
        }

        #endregion Methods

        // split input line at the first space into two parts: UPPERCASE keyword and content,
        // when there are no spaces entire line is a keyword
        private static KeyValuePair<string, string> SplitLine(string line)
        {
            var pos = line.IndexOf(' ');
            // lines have been trimmed, so no leading/trailing spaces are expected here
            if (pos > 0)
                return new KeyValuePair<string, string>(line.Substring(0, pos).ToUpper(), line.Substring(pos + 1));
            else
                return new KeyValuePair<string, string>(line.ToUpper(), string.Empty);
        }
    }

    /// <summary>
    /// DCP - Digital copy permitted
    /// 4CH - Four channel audio
    /// PRE - Pre-emphasis enabled (audio tracks only)
    /// SCMS - Serial copy management system (not supported by all recorders)
    /// There is a fourth subcode flag called "DATA" which is set for all non-audio tracks. This flag is set automatically based on the datatype of the track.
    /// </summary>
    public enum Flags
    {
        DCP, CH4, PRE, SCMS, DATA, NONE
    }

    /// <summary>
    /// BINARY - Intel binary file (least significant byte first)
    /// MOTOROLA - Motorola binary file (most significant byte first)
    /// AIFF - Audio AIFF file
    /// WAVE - Audio WAVE file
    /// MP3 - Audio MP3 file
    /// </summary>
    public enum FileType
    {
        BINARY, MOTOROLA, AIFF, WAVE, MP3
    }

    /// <summary>
    /// <list>
    /// <item>AUDIO - Audio/Music (2352)</item>
    /// <item>CDG - Karaoke CD+G (2448)</item>
    /// <item>MODE1/2048 - CDROM Mode1 Data (cooked)</item>
    /// <item>MODE1/2352 - CDROM Mode1 Data (raw)</item>
    /// <item>MODE2/2336 - CDROM-XA Mode2 Data</item>
    /// <item>MODE2/2352 - CDROM-XA Mode2 Data</item>
    /// <item>CDI/2336 - CDI Mode2 Data</item>
    /// <item>CDI/2352 - CDI Mode2 Data</item>
    /// </list>
    /// </summary>
    public enum DataType
    {
        AUDIO, CDG, MODE1_2048, MODE1_2352, MODE2_2336, MODE2_2352, CDI_2336, CDI_2352
    }

    /// <summary>
    /// This command is used to specify indexes (or subindexes) within a track.
    /// Syntax:
    ///  INDEX [number] [mm:ss:ff]
    /// </summary>
    public struct Index
    {
        //0-99
        private int m_number;

        private int m_minutes;
        private int m_seconds;
        private int m_frames;

        /// <summary>
        /// Index number (0-99)
        /// </summary>
        public int Number
        {
            get { return m_number; }
            set
            {
                if (value > 99)
                {
                    m_number = 99;
                }
                else if (value < 0)
                {
                    m_number = 0;
                }
                else
                {
                    m_number = value;
                }
            }
        }

        /// <summary>
        /// Possible values: 0-99
        /// </summary>
        public int Minutes
        {
            get { return m_minutes; }
            set
            {
                if (value > 99)
                {
                    m_minutes = 99;
                }
                else if (value < 0)
                {
                    m_minutes = 0;
                }
                else
                {
                    m_minutes = value;
                }
            }
        }

        /// <summary>
        /// Possible values: 0-59
        /// There are 60 seconds/minute
        /// </summary>
        public int Seconds
        {
            get { return m_seconds; }
            set
            {
                if (value >= 60)
                {
                    m_seconds = 59;
                }
                else if (value < 0)
                {
                    m_seconds = 0;
                }
                else
                {
                    m_seconds = value;
                }
            }
        }

        /// <summary>
        /// Possible values: 0-74
        /// There are 75 frames/second
        /// </summary>
        public int Frames
        {
            get { return m_frames; }
            set
            {
                if (value >= 75)
                {
                    m_frames = 74;
                }
                else if (value < 0)
                {
                    m_frames = 0;
                }
                else
                {
                    m_frames = value;
                }
            }
        }

        /// <summary>
        /// The Index of a track.
        /// </summary>
        /// <param name="number">Index number 0-99</param>
        /// <param name="minutes">Minutes (0-99)</param>
        /// <param name="seconds">Seconds (0-59)</param>
        /// <param name="frames">Frames (0-74)</param>
        public Index(int number, int minutes, int seconds, int frames)
        {
            m_number = number;

            m_minutes = minutes;
            m_seconds = seconds;
            m_frames = frames;
        }
    }

    /// <summary>
    /// This command is used to specify a data/audio file that will be written to the recorder.
    /// </summary>
    public struct AudioFile
    {
        private string m_Filename;
        private FileType m_Filetype;

        public string Filename
        {
            get { return m_Filename; }
            set { m_Filename = value; }
        }

        /// <summary>
        /// BINARY - Intel binary file (least significant byte first)
        /// MOTOROLA - Motorola binary file (most significant byte first)
        /// AIFF - Audio AIFF file
        /// WAVE - Audio WAVE file
        /// MP3 - Audio MP3 file
        /// </summary>
        public FileType Filetype
        {
            get { return m_Filetype; }
            set { m_Filetype = value; }
        }

        public AudioFile(string filename, string filetype)
        {
            m_Filename = filename;

            switch (filetype.Trim().ToUpper())
            {
                case "BINARY":
                    m_Filetype = FileType.BINARY;
                    break;

                case "MOTOROLA":
                    m_Filetype = FileType.MOTOROLA;
                    break;

                case "AIFF":
                    m_Filetype = FileType.AIFF;
                    break;

                case "WAVE":
                    m_Filetype = FileType.WAVE;
                    break;

                case "MP3":
                    m_Filetype = FileType.MP3;
                    break;

                default:
                    m_Filetype = FileType.BINARY;
                    break;
            }
        }

        public AudioFile(string filename, FileType filetype)
        {
            m_Filename = filename;
            m_Filetype = filetype;
        }
    }

    /// <summary>
    /// Track that contains either data or audio. It can contain Indices and comment information.
    /// </summary>
    public class Track
    {
        #region Private Variables

        private string[] m_Comments;

        // strings that don't belong or were mistyped in the global part of the cue
        private AudioFile m_DataFile;

        private string[] m_Garbage;
        private Index[] m_Indices;
        private string m_ISRC;

        private string m_Performer;
        private Index m_PostGap;
        private Index m_PreGap;
        private string m_Songwriter;
        private string m_Title;
        private Flags[] m_TrackFlags;
        private DataType m_TrackDataType;
        private int m_TrackNumber;

        #endregion Private Variables

        #region Properties

        /// <summary>
        /// Returns/Sets Index in this track.
        /// </summary>
        /// <param name="indexnumber">Index in the track.</param>
        /// <returns>Index at indexnumber.</returns>
        public Index this[int indexnumber]
        {
            get
            {
                return m_Indices[indexnumber];
            }
            set
            {
                m_Indices[indexnumber] = value;
            }
        }

        public string[] Comments
        {
            get { return m_Comments; }
            set { m_Comments = value; }
        }

        public AudioFile DataFile
        {
            get { return m_DataFile; }
            set { m_DataFile = value; }
        }

        /// <summary>
        /// Lines in the cue file that don't belong or have other general syntax errors.
        /// </summary>
        public string[] Garbage
        {
            get { return m_Garbage; }
            set { m_Garbage = value; }
        }

        public Index[] Indices
        {
            get { return m_Indices; }
            set { m_Indices = value; }
        }

        public string ISRC
        {
            get { return m_ISRC; }
            set { m_ISRC = value; }
        }

        public string Performer
        {
            get { return m_Performer; }
            set { m_Performer = value; }
        }

        public Index PostGap
        {
            get { return m_PostGap; }
            set { m_PostGap = value; }
        }

        public Index PreGap
        {
            get { return m_PreGap; }
            set { m_PreGap = value; }
        }

        public string Songwriter
        {
            get { return m_Songwriter; }
            set { m_Songwriter = value; }
        }

        /// <summary>
        /// If the TITLE command appears before any TRACK commands, then the string will be encoded as the title of the entire disc.
        /// </summary>
        public string Title
        {
            get { return m_Title; }
            set { m_Title = value; }
        }

        public DataType TrackDataType
        {
            get { return m_TrackDataType; }
            set { m_TrackDataType = value; }
        }

        public Flags[] TrackFlags
        {
            get { return m_TrackFlags; }
            set { m_TrackFlags = value; }
        }

        public int TrackNumber
        {
            get { return m_TrackNumber; }
            set { m_TrackNumber = value; }
        }

        #endregion Properties

        #region Contructors

        public Track(int tracknumber, string datatype)
        {
            m_TrackNumber = tracknumber;

            switch (datatype.Trim().ToUpper())
            {
                case "AUDIO":
                    m_TrackDataType = DataType.AUDIO;
                    break;

                case "CDG":
                    m_TrackDataType = DataType.CDG;
                    break;

                case "MODE1/2048":
                    m_TrackDataType = DataType.MODE1_2048;
                    break;

                case "MODE1/2352":
                    m_TrackDataType = DataType.MODE1_2352;
                    break;

                case "MODE2/2336":
                    m_TrackDataType = DataType.MODE2_2336;
                    break;

                case "MODE2/2352":
                    m_TrackDataType = DataType.MODE2_2352;
                    break;

                case "CDI/2336":
                    m_TrackDataType = DataType.CDI_2336;
                    break;

                case "CDI/2352":
                    m_TrackDataType = DataType.CDI_2352;
                    break;

                default:
                    m_TrackDataType = DataType.AUDIO;
                    break;
            }

            m_TrackFlags = new Flags[0];
            m_Songwriter = "";
            m_Title = "";
            m_ISRC = "";
            m_Performer = "";
            m_Indices = new Index[0];
            m_Garbage = new string[0];
            m_Comments = new string[0];
            m_PreGap = new Index(-1, 0, 0, 0);
            m_PostGap = new Index(-1, 0, 0, 0);
            m_DataFile = new AudioFile();
        }

        public Track(int tracknumber, DataType datatype)
        {
            m_TrackNumber = tracknumber;
            m_TrackDataType = datatype;

            m_TrackFlags = new Flags[0];
            m_Songwriter = "";
            m_Title = "";
            m_ISRC = "";
            m_Performer = "";
            m_Indices = new Index[0];
            m_Garbage = new string[0];
            m_Comments = new string[0];
            m_PreGap = new Index(-1, 0, 0, 0);
            m_PostGap = new Index(-1, 0, 0, 0);
            m_DataFile = new AudioFile();
        }

        #endregion Contructors

        #region Methods

        public void AddFlag(Flags flag)
        {
            //if it's not a none tag
            //and if the tags hasn't already been added
            if (flag != Flags.NONE && NewFlag(flag) == true)
            {
                m_TrackFlags = (Flags[])CueSheet.ResizeArray(m_TrackFlags, m_TrackFlags.Length + 1);
                m_TrackFlags[m_TrackFlags.Length - 1] = flag;
            }
        }

        public void AddFlag(string flag)
        {
            switch (flag.Trim().ToUpper())
            {
                case "DATA":
                    AddFlag(Flags.DATA);
                    break;

                case "DCP":
                    AddFlag(Flags.DCP);
                    break;

                case "4CH":
                    AddFlag(Flags.CH4);
                    break;

                case "PRE":
                    AddFlag(Flags.PRE);
                    break;

                case "SCMS":
                    AddFlag(Flags.SCMS);
                    break;

                default:
                    return;
            }
        }

        public void AddGarbage(string garbage)
        {
            if (garbage.Trim() != "")
            {
                m_Garbage = (string[])CueSheet.ResizeArray(m_Garbage, m_Garbage.Length + 1);
                m_Garbage[m_Garbage.Length - 1] = garbage;
            }
        }

        public void AddComment(string comment)
        {
            if (comment.Trim() != "")
            {
                m_Comments = (string[])CueSheet.ResizeArray(m_Comments, m_Comments.Length + 1);
                m_Comments[m_Comments.Length - 1] = comment;
            }
        }

        public void AddIndex(int number, int minutes, int seconds, int frames)
        {
            m_Indices = (Index[])CueSheet.ResizeArray(m_Indices, m_Indices.Length + 1);

            m_Indices[m_Indices.Length - 1] = new Index(number, minutes, seconds, frames);
        }

        public void RemoveIndex(int indexIndex)
        {
            for (int i = indexIndex; i < m_Indices.Length - 1; i++)
            {
                m_Indices[i] = m_Indices[i + 1];
            }
            m_Indices = (Index[])CueSheet.ResizeArray(m_Indices, m_Indices.Length - 1);
        }

        public TimeSpan Offset
        {
            get
            {
                if (m_Indices.Length == 0)
                    return TimeSpan.Zero;

                var index = Indices.Length > 1 ? Indices[1] : Indices[0];
                return new TimeSpan(0, 0, index.Minutes, index.Seconds, index.Frames * 1000 / 75);
            }
        }

        /// <summary>
        /// Checks if the flag is indeed new in this track.
        /// </summary>
        /// <param name="new_flag">The new flag to be added to the track.</param>
        /// <returns>True if this flag doesn't already exist.</returns>
        private bool NewFlag(Flags new_flag)
        {
            foreach (Flags flag in m_TrackFlags)
            {
                if (flag == new_flag)
                {
                    return false;
                }
            }
            return true;
        }

        /// <summary>
        /// CueSheet string representation for debugging purposes
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            StringBuilder output = new StringBuilder();

            //write file
            if (m_DataFile.Filename != null && m_DataFile.Filename.Trim() != "")
            {
                output.Append("FILE \"" + m_DataFile.Filename.Trim() + "\" " + m_DataFile.Filetype.ToString() + Environment.NewLine);
            }

            output.Append("  TRACK " + m_TrackNumber.ToString().PadLeft(2, '0') + " " + m_TrackDataType.ToString().Replace('_', '/'));

            //write comments
            foreach (string comment in m_Comments)
            {
                output.Append(Environment.NewLine + "    REM " + comment);
            }

            if (m_Performer.Trim() != "")
            {
                output.Append(Environment.NewLine + "    PERFORMER \"" + m_Performer + "\"");
            }

            if (m_Songwriter.Trim() != "")
            {
                output.Append(Environment.NewLine + "    SONGWRITER \"" + m_Songwriter + "\"");
            }

            if (m_Title.Trim() != "")
            {
                output.Append(Environment.NewLine + "    TITLE \"" + m_Title + "\"");
            }

            //write flags
            if (m_TrackFlags.Length > 0)
            {
                output.Append(Environment.NewLine + "    FLAGS");
            }

            foreach (Flags flag in m_TrackFlags)
            {
                output.Append(" " + flag.ToString().Replace("CH4", "4CH"));
            }

            //write isrc
            if (m_ISRC.Trim() != "")
            {
                output.Append(Environment.NewLine + "    ISRC " + m_ISRC.Trim());
            }

            //write pregap
            if (m_PreGap.Number != -1)
            {
                output.Append(Environment.NewLine + "    PREGAP " + m_PreGap.Minutes.ToString().PadLeft(2, '0') + ":" + m_PreGap.Seconds.ToString().PadLeft(2, '0') + ":" + m_PreGap.Frames.ToString().PadLeft(2, '0'));
            }

            //write Indices
            for (int j = 0; j < m_Indices.Length; j++)
            {
                output.Append(Environment.NewLine + "    INDEX " + this[j].Number.ToString().PadLeft(2, '0') + " " + this[j].Minutes.ToString().PadLeft(2, '0') + ":" + this[j].Seconds.ToString().PadLeft(2, '0') + ":" + this[j].Frames.ToString().PadLeft(2, '0'));
            }

            //write postgap
            if (m_PostGap.Number != -1)
            {
                output.Append(Environment.NewLine + "    POSTGAP " + m_PostGap.Minutes.ToString().PadLeft(2, '0') + ":" + m_PostGap.Seconds.ToString().PadLeft(2, '0') + ":" + m_PostGap.Frames.ToString().PadLeft(2, '0'));
            }

            return output.ToString();
        }

        #endregion Methods
    }
}