//
// System.Drawing.Text.FontCollection.cs
//
// (C) 2002 Ximian, Inc.  http://www.ximian.com
// Author: Everaldo Canuto everaldo.canuto@bol.com.br
//			Sanjay Gupta (gsanjay@novell.com)
//
using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace System.Drawing.Text {

	public abstract class FontCollection : IDisposable {
		
		internal IntPtr nativeFontCollection = IntPtr.Zero;
		internal FontFamily[] families;
				
		internal FontCollection ()
		{
		}
        
        internal FontCollection ( IntPtr ptr )
		{
			nativeFontCollection = ptr;
		}

		// methods
		public void Dispose()
		{
			//Dispose ( true );
			if ( families != null ) {
				int length = families.Length;
				Status status;
				for ( int i = 0; i < length; i++){
					status = GDIPlus.GdipDeleteFontFamily ( families[i].NativeObject );
					if ( status != Status.Ok ) 
						families[i].NativeObject = IntPtr.Zero;
				}
			}
			System.GC.SuppressFinalize ( this );
		}

		[MonoTODO]
		protected virtual void Dispose ( bool disposing )
		{
			//Nothing for now
		}

		// properties
		public FontFamily[] Families
		{
			get { 
				int found;
				int returned;
				Status status;
				
				status = GDIPlus.GdipGetFontCollectionFamilyCount ( nativeFontCollection, out found );
				if ( status != Status.Ok ) {
					throw new Exception ( "Error calling GDIPlus.GdipGetFontCollectionFamilyCount: " + status );
				}
				
				int nSize =  Marshal.SizeOf ( IntPtr.Zero );
				IntPtr dest = Marshal.AllocHGlobal ( nSize * found );           
               
				status = GDIPlus.GdipGetFontCollectionFamilyList( nativeFontCollection, found, dest, out returned );
				if ( status != Status.Ok ) {					
					throw new Exception ( "Error calling GDIPlus.GdipGetFontCollectionFamilyList: " + status );					
				}
                   
				IntPtr[] ptrAr = new IntPtr [ returned ];
				int pos = dest.ToInt32 ();
				for ( int i = 0; i < returned ; i++, pos+=nSize )
					ptrAr[i] = (IntPtr)Marshal.PtrToStructure ( (IntPtr)pos, typeof(IntPtr) );
           
				Marshal.FreeHGlobal ( dest );           
                   
				families = new FontFamily [ returned ];
				for ( int i = 0; i < returned; i++ )
					families[i] = new FontFamily ( ptrAr[i] );                     
                           
				return families;               
			}
		}

		~FontCollection()
		{
			Dispose ( false );
		}

	}

}