/////////////////////////////////////////////////////////////////////////////////
// Paint.NET                                                                   //
// Copyright (C) dotPDN LLC, Rick Brewster, Tom Jackson, and contributors.     //
// Portions Copyright (C) Microsoft Corporation. All Rights Reserved.          //
// See license-pdn.txt for full licensing and attribution details.             //
/////////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using Gdk;

namespace Pinta.Core
{
	/// <summary>
	/// Defines a surface that is irregularly shaped, defined by a Region.
	/// Works by containing an array of PlacedSurface instances.
	/// Similar to IrregularImage, but works with Surface objects instead.
	/// Instances of this class are immutable once created.
	/// </summary>
	[Serializable]
	public sealed class IrregularSurface : ISurfaceDraw, IDisposable, ICloneable, IDeserializationCallback
	{
		private List<PlacedSurface> placedSurfaces;

		[NonSerialized]
		private Region region;

		#region Constructors
		/// <summary>
		/// Constructs an IrregularSurface by copying the given region-of-interest from an Image.
		/// </summary>
		/// <param name="source">The Surface to copy pixels from.</param>
		/// <param name="roi">Defines the Region from which to copy pixels from the Image.</param>
		public IrregularSurface (Cairo.ImageSurface source, Region roi)
		{
			Region roiClipped = (Region)roi.Copy ();
			roiClipped.Intersect (Region.Rectangle (source.GetBounds ()));

			Rectangle[] rects = roiClipped.GetRectangles ();
			this.placedSurfaces = new List<PlacedSurface> (rects.Length);

			foreach (Rectangle rect in rects)
				this.placedSurfaces.Add (new PlacedSurface (source, rect));

			this.region = roiClipped;
		}

		public IrregularSurface (Cairo.ImageSurface source, Rectangle[] roi)
		{
			this.placedSurfaces = new List<PlacedSurface> (roi.Length);

			foreach (Rectangle rect in roi) {
				Rectangle ri = Rectangle.Intersect (source.GetBounds (), rect);

				if (!ri.IsEmpty)
					this.placedSurfaces.Add (new PlacedSurface (source, ri));
			}

			this.region = Utility.RectanglesToRegion (roi);
			this.region.Intersect (Region.Rectangle (source.GetBounds ()));
		}

		/// <summary>
		/// Constructs an IrregularSurface by copying the given rectangle-of-interest from an Image.
		/// </summary>
		/// <param name="source">The Surface to copy pixels from.</param>
		/// <param name="roi">Defines the Rectangle from which to copy pixels from the Image.</param>
		public IrregularSurface (Cairo.ImageSurface source, Rectangle roi)
		{
			this.placedSurfaces = new List<PlacedSurface> ();
			this.placedSurfaces.Add (new PlacedSurface (source, roi));
			this.region = Region.Rectangle (roi);
		}

		private IrregularSurface (IrregularSurface cloneMe)
		{
			this.placedSurfaces = new List<PlacedSurface> (cloneMe.placedSurfaces.Count);

			foreach (PlacedSurface ps in cloneMe.placedSurfaces)
				this.placedSurfaces.Add ((PlacedSurface)ps.Clone ());

			this.region = cloneMe.Region.Copy ();
		}

		~IrregularSurface ()
		{
			Dispose (false);
		}
		#endregion

		#region Public Properties
		/// <summary>
		/// The Region that the irregular image fills.
		/// </summary>
		public Region Region {
			get {
				if (this.disposed)
					throw new ObjectDisposedException ("IrregularSurface");

				return this.region;
			}
		}
		#endregion

		#region Public Methods
		/// <summary>
		/// Draws the IrregularSurface on to the given Surface.
		/// </summary>
		/// <param name="dst">The Surface to draw to.</param>
		public void Draw (Cairo.ImageSurface dst)
		{
			if (disposed)
				throw new ObjectDisposedException ("IrregularSurface");

			foreach (PlacedSurface ps in placedSurfaces)
				ps.Draw (dst);
		}

		public void Draw (Cairo.ImageSurface dst, PixelOp pixelOp)
		{
			if (this.disposed)
				throw new ObjectDisposedException ("IrregularSurface");

			foreach (PlacedSurface ps in this.placedSurfaces)
				ps.Draw (dst, pixelOp);
		}

		/// <summary>
		/// Draws the IrregularSurface on to the given Surface starting at the given (x,y) offset.
		/// </summary>
		/// <param name="g">The Surface to draw to.</param>
		/// <param name="transformX">The value to be added to every X coordinate that is used for drawing.</param>
		/// <param name="transformY">The value to be added to every Y coordinate that is used for drawing.</param>
		public void Draw (Cairo.ImageSurface dst, int tX, int tY)
		{
			if (this.disposed)
				throw new ObjectDisposedException ("IrregularSurface");

			foreach (PlacedSurface ps in this.placedSurfaces)
				ps.Draw (dst, tX, tY);
		}

		public void Draw (Cairo.ImageSurface dst, int tX, int tY, PixelOp pixelOp)
		{
			if (this.disposed)
				throw new ObjectDisposedException ("IrregularSurface");

			foreach (PlacedSurface ps in this.placedSurfaces)
				ps.Draw (dst, tX, tY, pixelOp);
		}
		#endregion

		#region IDisposable Members
		private bool disposed = false;

		public void Dispose ()
		{
			Dispose (true);
			System.GC.SuppressFinalize (this);
		}

		private void Dispose (bool disposing)
		{
			if (!this.disposed) {
				// TODO: FXCOP: call Dispose() on this.region

				this.disposed = true;

				if (disposing) {
					this.placedSurfaces.Clear ();
					this.placedSurfaces = null;
				}
			}
		}
		#endregion

		#region ICloneable Members
		/// <summary>
		/// Clones the IrregularSurface.
		/// </summary>
		/// <returns>A copy of the current state of this PlacedSurface.</returns>
		public object Clone ()
		{
			if (disposed)
				throw new ObjectDisposedException ("IrregularSurface");

			return new IrregularSurface (this);
		}
		#endregion

		#region IDeserializationCallback Members
		public void OnDeserialization (object sender)
		{
			region = Region.Rectangle (Rectangle.Zero);

			Rectangle[] rects = new Rectangle[placedSurfaces.Count];

			for (int i = 0; i < placedSurfaces.Count; ++i)
				rects[i] = placedSurfaces[i].Bounds;

			region = Utility.RectanglesToRegion (rects);
		}
		#endregion
	}
}