Audio Book Player

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using System.Collections;
using System.Runtime.InteropServices;

public enum eBookProperty
{
    BOOKMARK_ENTRY = 0,
    BOOKMARK_LOCATION = 1,
    VOLUME = 2,
    SHUFFLE = 3
};
public enum eTagNames
{
    ALBUM = 0,
    TITLE = 1,
    AUTHOR = 2,
    COMMENT = 3,
    FILE_NAME = 4
};
public enum ePlayerStatus
{
    UNDEFINED = 0,
    STOPPED = 1,
    PAUSED = 2,
    PLAYING = 3,
    SCAN_FORWARD = 4,
    SCAN_REVERSE = 5,
    BUFFERING = 6,
    WAITING = 7,
    MEDIA_ENDED = 8,
    TRANSITIONING = 9,
    READY = 10,
    RECONNECTING = 11
};
public struct PowerState
{
    public bool ACLineConnected;
    public byte BatteryLifePercent;
    public PowerState(bool ac, byte life)
    {
        ACLineConnected = ac;
        BatteryLifePercent = life;
    }
};
// declare event handlers
public delegate void PlayItemChangedEventHandler(object sender, PlayItemChangedEventArgs e);
public delegate void StatusChangedEventHandler(object sender, StatusChangedEventArgs e);
// declare event class for play item changed
public class PlayItemChangedEventArgs : EventArgs
{
    private int pItemIndex;
    public int ItemIndex
    { get { return pItemIndex; } }
    public PlayItemChangedEventArgs(int i) { pItemIndex = i; }
}
// declare event class for play status changed
public class StatusChangedEventArgs : EventArgs
{
    private ePlayerStatus pStatus;
    private String pStatusText;
    public ePlayerStatus Status
    { get { return pStatus; } }
    public String StatusText
    { get { return pStatusText; } }
    public StatusChangedEventArgs(ePlayerStatus e, String s)
    { pStatusText = s; pStatus = e; }
}
public abstract class cBasePersistancy
{
    [DllImport("coredll.dll")]
    public extern static int GetDiskFreeSpaceEx(
    string lpRootPathName, ref Int64 lpFreeBytesAvailableToCaller,
    ref Int64 lpTotalNumberOfBytes, ref Int64 lpTotalNumberOfFreeBytes);

    public abstract String ActiveBookName { get; set; }
    public abstract String Skin { get; set; }
    public abstract int GetBookProperty(eBookProperty prop, String book);
    public abstract bool SetBookProperty(eBookProperty prop, int value, String book);
    public abstract String[] Books { get; }
    public abstract String[] Bookshelves { get; }
    public abstract String[] GetBookshelfBooks(String bookshelf);
    public abstract String GetBooksBookshelf(String book);
    public abstract bool NewBookshelf(String bookshelf);
    public abstract bool DeleteBookshelf(String bookshelf);
    public abstract bool SetBooksBookshelf(String book, String newBookshelf);
    public abstract bool NewBook(String book, String bookshelf);
    public abstract int GetBookFileCount(String book);
    public abstract String[] GetBookFiles(String book);
    public abstract bool SetBookFiles(String[] newFiles, String book);
    public abstract bool DeleteBookFile(int ix, String book);
    public abstract bool DeleteBookFiles(String book);
    public abstract bool RenameBookShelf(String newName, String bookshelf);
    public abstract bool RenameBook(String newName, String book);
    public abstract bool DeleteBook(String book);
    // unique item
    public String MakeUnique(String item)
    {
        ArrayList list = new ArrayList();
        list.AddRange(Books);
        list.AddRange(Bookshelves);
        for (int i = 0; i < list.Count; i++)
            list[i] = ((String)(list[i])).ToUpper();
        if(list.IndexOf(item.ToUpper()) == -1) return item;
        int n = 1;
        String newName = "";
        do
        {
            n++;
            newName = item + " (" + n.ToString() + ")";
        } while (list.IndexOf(newName.ToUpper()) != -1);
        return newName;
    }
    // find storate card with largest capacity
    public String GetLargestStorageCard()
    {
        Int64 HighCapacity = 0;
        String StorageCard = "";
        DirectoryInfo[] root = new DirectoryInfo(@"\").GetDirectories();
        foreach (DirectoryInfo dir in root)
        {
            if ((dir.Attributes & FileAttributes.Temporary) != 0)
            {
                Int64 notNeeded1 = 0;
                Int64 notNeeded2 = 0;
                Int64 CardCapacity = 0;
                GetDiskFreeSpaceEx(dir.FullName, ref notNeeded1,
                    ref CardCapacity, ref notNeeded2);
                if (CardCapacity > HighCapacity)
                {
                    HighCapacity = CardCapacity;
                    StorageCard = dir.FullName;
                }
            }
        }
        return StorageCard;
    }
}
public abstract class cBaseDeviceSpecifics
{
    public abstract int Volume { get; set; }
    public abstract long PowerOffThreshold { get;}
    public abstract PowerState PowerAndBatteryState { get;}
    public abstract int BacklightTimeout { get; set; }
    public abstract void Beep();
    public abstract void PreventAutoPowerOff();
    public abstract void PowerOff();
}
public abstract class cBasePlayer
{
    public abstract ePlayerStatus Status { get; }
    public abstract String StatusString { get;}
    public abstract bool Shuffle { get; set; }
    public abstract int Duration { get;}
    public abstract String DurationString { get; }
    public abstract int Location { get; set; }
    public abstract String LocationString { get; }
    public abstract int TotalDuration { get; }
    public abstract String TotalDurationString { get;}
    public abstract int TotalDurationSoFar { get;}
    public abstract String TotalDurationSoFarString { get; }
    public abstract int TotalDurationRemain { get;}
    public abstract String TotalDurationRemainString { get;}
    public abstract int PlaylistCount { get; }
    public abstract int PlayingIndex { get; set; }
    public abstract String PlayingPath { get;}
    public abstract String PlayingName { get;}
    public abstract void Dispose();
    public abstract String PlaylistFile(int i);
    public abstract int FileDuration(int i);
    public abstract int RemoveAt(int ix);
    public abstract String GetMediaTAG(eTagNames tag);
    public abstract bool Play();
    public abstract bool Pause();
    public abstract bool Next();
    public abstract bool Previous();
    public abstract bool Stop();
    public abstract bool StopAndClear();
    public abstract bool Playlist(String[] files, int Entry, int Location, bool Shuffle);
    public abstract bool WaitForPlayerStatus(ePlayerStatus s);
    public abstract String TimeToString(int time);
    public abstract String TrimTimeString(String str);
    public abstract void GetTotalsDurationsThreadFunction();
}