#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Rendering;
using SlimDX.Direct3D;
using System.Drawing;

#endregion

namespace CodeImp.DoomBuilder.Map
{
	public sealed class Vertex
	{
		#region ================== Constants
		
		public const int BUFFERVERTICES = 1;
		public const int RENDERPRIMITIVES = 1;
		
		#endregion

		#region ================== Variables

		// Map
		private MapSet map;
		
		// List items
		private LinkedListNode<Vertex> mainlistitem;

		// Position
		private Vector2D pos;

		// References
		private LinkedList<Linedef> linedefs;

		// Selections
		private bool selected;
		private bool marked;
		
		// Cloning
		private Vertex clone;

		// Additional fields
		private SortedList<string, object> fields;
		
		// Disposing
		private bool isdisposed = false;

		#endregion

		#region ================== Properties

		public MapSet Map { get { return map; } }
		public ICollection<Linedef> Linedefs { get { return linedefs; } }
		public Vector2D Position { get { return pos; } }
		public bool IsDisposed { get { return isdisposed; } }
		public bool Selected { get { return selected; } set { selected = value; } }
		public bool Marked { get { return marked; } set { marked = value; } }
		public Vertex Clone { get { return clone; } set { clone = value; } }
		public SortedList<string, object> Fields { get { return fields; } }

		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		internal Vertex(MapSet map, LinkedListNode<Vertex> listitem, Vector2D pos)
		{
			// Initialize
			this.map = map;
			this.linedefs = new LinkedList<Linedef>();
			this.mainlistitem = listitem;
			this.pos = pos;
			
			// We have no destructor
			GC.SuppressFinalize(this);
		}

		// Disposer
		public void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Already set isdisposed so that changes can be prohibited
				isdisposed = true;
				
				// Remove from main list
				mainlistitem.List.Remove(mainlistitem);

				// Dispose the lines that are attached to this vertex
				// because a linedef cannot exist without 2 vertices.
				while(linedefs.First != null) linedefs.First.Value.Dispose();
				
				// Clean up
				linedefs = null;
				mainlistitem = null;
				map = null;
			}
		}

		#endregion

		#region ================== Management

		// This attaches a linedef and returns the listitem
		public LinkedListNode<Linedef> AttachLinedef(Linedef l) { return linedefs.AddLast(l); }

		// This detaches a linedef
		public void DetachLinedef(LinkedListNode<Linedef> l)
		{
			// Not disposing?
			if(!isdisposed)
			{
				// Remove linedef
				linedefs.Remove(l);

				// No more linedefs left?
				if(linedefs.Count == 0)
				{
					// This vertex is now useless, dispose it
					this.Dispose();
				}
			}
		}

		#endregion

		#region ================== Fields

		// This makes new fields
		public void MakeFields()
		{
			if(fields != null) fields = new SortedList<string, object>();
		}

		// This makes fields from another list of fields
		public void MakeFields(SortedList<string, object> copyfrom)
		{
			if(fields != null) fields = new SortedList<string, object>();
			foreach(KeyValuePair<string, object> f in copyfrom) fields[f.Key] = f.Value;
		}

		#endregion
		
		#region ================== Methods

		// This copies all properties to another thing
		public void CopyPropertiesTo(Vertex v)
		{
			// Copy properties
			v.pos = pos;
			if(fields != null) v.MakeFields(fields);
			v.selected = selected;
		}
		
		// This returns the distance from given coordinates
		public float DistanceToSq(Vector2D p)
		{
			return (p.x - pos.x) * (p.x - pos.x) + (p.y - pos.y) * (p.y - pos.y);
		}
		
		// This returns the distance from given coordinates
		public float DistanceTo(Vector2D p)
		{
			Vector2D delta = p - pos;
			return delta.GetLength();
		}

		// This finds the line closest to the specified position
		public Linedef NearestLinedef(Vector2D pos) { return MapSet.NearestLinedef(linedefs, pos); }

		// This moves the vertex
		public void Move(Vector2D newpos)
		{
			// Change position
			pos = newpos;
			
			// Let all lines know they need an update
			foreach(Linedef l in linedefs) l.NeedUpdate();
		}

		// This snaps the vertex to the map format accuracy
		public void SnapToAccuracy()
		{
			// Round the coordinates
			Vector2D newpos = new Vector2D((float)Math.Round(pos.x, General.Map.FormatInterface.VertexDecimals),
										   (float)Math.Round(pos.y, General.Map.FormatInterface.VertexDecimals));
			this.Move(newpos);
		}

		// This snaps the vertex to the grid
		public void SnapToGrid()
		{
			// Calculate nearest grid coordinates
			this.Move(General.Map.Grid.SnappedToGrid(pos));
		}
		
		// This joins another vertex
		// Which means this vertex is removed and the other is kept!
		public void Join(Vertex other)
		{
			// If either of the two vertices was selected, keep the other selected
			if(this.selected) other.selected = true;
			if(this.marked) other.marked = true;

			// Detach all linedefs and attach them to the other
			// This will automatically dispose this vertex
			while(linedefs != null)
			{
				// Move the line to the other vertex
				if(linedefs.First.Value.Start == this)
					linedefs.First.Value.SetStartVertex(other);
				else
					linedefs.First.Value.SetEndVertex(other);
			}
		}

		#endregion
	}
}