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

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using CodeImp.DoomBuilder.Actions;
using CodeImp.DoomBuilder.Config;
using CodeImp.DoomBuilder.Editing;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.Windows;

#endregion

namespace CodeImp.DoomBuilder.BuilderModes
{
	[EditMode(DisplayName = "Draw Curve Mode",
			  SwitchAction = "drawcurvemode",
			  ButtonImage = "DrawCurveMode.png", //mxd	
			  ButtonOrder = int.MinValue + 2, //mxd
			  ButtonGroup = "000_drawing", //mxd
			  AllowCopyPaste = false,
			  Volatile = true,
			  Optional = false)]

	public class DrawCurveMode : DrawGeometryMode
	{
		#region ================== Variables

		private readonly HintLabel hintlabel;
		private Curve curve;
		private int segmentlength;
		private const int MIN_SEGMENT_LENGTH = 16;
		private const int MAX_SEGMENT_LENGTH = 4096; //just some arbitrary number

		// Interface
		private DrawCurveOptionsPanel panel;

		#endregion

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

		public DrawCurveMode() 
		{
			hintlabel = new HintLabel(General.Colors.InfoLine);
			labeluseoffset = false;
		}

		public override void Dispose() 
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Clean up
				if(hintlabel != null) hintlabel.Dispose();

				// Done
				base.Dispose();
			}
		}

		#endregion

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

		protected override void Update() 
		{
			PixelColor stitchcolor = General.Colors.Highlight;
			PixelColor losecolor = General.Colors.Selection;

			snaptocardinaldirection = General.Interface.ShiftState && General.Interface.AltState;
			snaptogrid = snaptocardinaldirection || General.Interface.ShiftState ^ General.Interface.SnapToGrid;
			snaptonearest = General.Interface.CtrlState ^ General.Interface.AutoMerge;

			DrawnVertex curp = GetCurrentPosition();
			float vsize = (renderer.VertexSize + 1.0f) / renderer.Scale;

			// Update label positions (mxd)
			if(labels.Count > 0)
			{
				// Update labels for already drawn lines
				for(int i = 0; i < labels.Count - 1; i++)
					labels[i].Move(points[i].pos, points[i + 1].pos);

				// Update label for active line
				labels[labels.Count - 1].Move(points[points.Count - 1].pos, curp.pos);
			}

			// Render drawing lines
			if(renderer.StartOverlay(true)) 
			{
				// Go for all points to draw lines
				if(points.Count > 0) 
				{
					//update curve
					List<Vector2D> verts = new List<Vector2D>();
					for(int i = 0; i < points.Count; i++) verts.Add(points[i].pos);
					if(curp.pos != verts[verts.Count-1]) verts.Add(curp.pos);
					curve = CurveTools.CurveThroughPoints(verts, 0.5f, 0.75f, segmentlength);

					// Render lines
					for(int i = 1; i < curve.Shape.Count; i++) 
					{
						// Determine line color
						PixelColor c = snaptonearest ? stitchcolor : losecolor;

						// Render line
						renderer.RenderLine(curve.Shape[i - 1], curve.Shape[i], LINE_THICKNESS, c, true);
					}

					//render "inactive" vertices
					for(int i = 1; i < curve.Shape.Count - 1; i++) 
					{
						// Determine vertex color
						PixelColor c = !snaptonearest ? stitchcolor : losecolor;

						// Render vertex
						renderer.RenderRectangleFilled(new RectangleF((float)(curve.Shape[i].x - vsize), (float)(curve.Shape[i].y - vsize), vsize * 2.0f, vsize * 2.0f), c, true);
					}
				}

				if(points.Count > 0) 
				{
					// Render vertices
					for(int i = 0; i < points.Count; i++) 
					{
						// Determine vertex color
						PixelColor c = points[i].stitch ? stitchcolor : losecolor;

						// Render vertex
						renderer.RenderRectangleFilled(new RectangleF((float)(points[i].pos.x - vsize), (float)(points[i].pos.y - vsize), vsize * 2.0f, vsize * 2.0f), c, true);
					}
				}

				// Determine point color
				PixelColor color = snaptonearest ? stitchcolor : losecolor;

				// Render vertex at cursor
				renderer.RenderRectangleFilled(new RectangleF((float)(curp.pos.x - vsize), (float)(curp.pos.y - vsize), vsize * 2.0f, vsize * 2.0f), color, true);

				// Render labels
				renderer.RenderText(labels.ToArray());

				//Render info label
				Vector2D start = new Vector2D(mousemappos.x + (32 / renderer.Scale), mousemappos.y - (16 / renderer.Scale));
				Vector2D end = new Vector2D(mousemappos.x + (96 / renderer.Scale), mousemappos.y);
				hintlabel.Move(start, end);
				hintlabel.Text = "SEG LEN: " + segmentlength;
				renderer.RenderText(hintlabel.TextLabel);

				// Done
				renderer.Finish();
			}

			// Done
			renderer.Present();
		}

		#endregion

		#region ================== Events

		public override void OnEngage() 
		{
			base.OnEngage();

			//setup settings panel
			panel.SegmentLength = segmentlength;
			panel.Register();
		}

		public override void OnAccept() 
		{
			Cursor.Current = Cursors.AppStarting;
			General.Settings.FindDefaultDrawSettings();

			// When points have been drawn
			if(points.Count > 0) 
			{
				// Make undo for the draw
				General.Map.UndoRedo.CreateUndo("Curve draw");

				// Make an analysis and show info
				string[] adjectives =
				{
				  "beautiful", "lovely", "romantic", "stylish", "cheerful", "comical",
				  "awesome", "accurate", "adorable", "adventurous", "attractive", "cute",
				  "elegant", "glamorous", "gorgeous", "handsome", "magnificent", "unusual",
				  "outstanding", "mysterious", "amusing", "charming", "fantastic", "jolly" 
				};
				string word = adjectives[points.Count % adjectives.Length];
				word = (points.Count > adjectives.Length) ? "very " + word : word;
				string a = ((word[0] == 'a') || (word[0] == 'e') || (word[0] == 'o') || (word[0] == 'u')) ? "an " : "a ";
				General.Interface.DisplayStatus(StatusType.Action, "Created " + a + word + " curve.");

				List<DrawnVertex> verts = new List<DrawnVertex>();
				
				// If we have a curve...
				if(points.Count > 2)
				{
					// Is it an (auto)closed curve?
					int lastpoint;
					if(drawingautoclosed || points[0].pos == points[points.Count - 1].pos) 
						lastpoint = curve.Segments.Count;
					else 
						lastpoint = curve.Segments.Count - 1;

					for(int i = 0; i < lastpoint; i++) 
					{
						int next = (i == curve.Segments.Count - 1 ? 0 : i + 1);
						bool stitch = points[i].stitch && points[next].stitch;
						bool stitchline = points[i].stitchline && points[next].stitchline;

						// Add segment points except the last one
						for(int c = 0; c < curve.Segments[i].Points.Length - 1; c++) 
						{
							DrawnVertex dv = new DrawnVertex();
							dv.pos = curve.Segments[i].Points[c];
							dv.stitch = stitch;
							dv.stitchline = stitchline;
							verts.Add(dv);
						}
					}

					// Add the last point
					DrawnVertex end = new DrawnVertex();
					end.pos = curve.Segments[lastpoint - 1].End;
					end.stitch = verts[verts.Count - 1].stitch;
					end.stitchline = verts[verts.Count - 1].stitchline;
					verts.Add(end);
				}
				else
				{
					verts = points;
				}

				// Make the drawing
				if(Tools.DrawLines(verts, true, BuilderPlug.Me.AutoAlignTextureOffsetsOnCreate)) //mxd
				{
					// Snap to map format accuracy
					General.Map.Map.SnapAllToAccuracy();

					// Clear selection
					General.Map.Map.ClearAllSelected();

					// Update cached values
					General.Map.Map.Update();

					//mxd. Outer sectors may require some splittin...
					if(General.Settings.SplitJoinedSectors) Tools.SplitOuterSectors(General.Map.Map.GetMarkedLinedefs(true));

					// Edit new sectors?
					List<Sector> newsectors = General.Map.Map.GetMarkedSectors(true);
					if(BuilderPlug.Me.EditNewSector && (newsectors.Count > 0))
						General.Interface.ShowEditSectors(newsectors);

					// Update the used textures
					General.Map.Data.UpdateUsedTextures();

					//mxd
					General.Map.Renderer2D.UpdateExtraFloorFlag();

					// Map is changed
					General.Map.IsChanged = true;
				}
				else
				{
					// Drawing failed
					// NOTE: I have to call this twice, because the first time only cancels this volatile mode
					General.Map.UndoRedo.WithdrawUndo();
					General.Map.UndoRedo.WithdrawUndo();
				}
			}

			// Done
			Cursor.Current = Cursors.Default;

			if(continuousdrawing)
			{
				// Reset settings
				points.Clear();
				labels.Clear();
				drawingautoclosed = false;

				// Redraw display
				General.Interface.RedrawDisplay();
			}
			else
			{
				// Return to original mode
				General.Editing.ChangeMode(General.Editing.PreviousStableMode.Name);
			}
		}

		private void OptionsPanelOnValueChanged(object sender, EventArgs eventArgs) 
		{
			segmentlength = panel.SegmentLength;
			Update();
		}

		public override void OnHelp() 
		{
			General.ShowHelp("/gzdb/features/classic_modes/mode_drawcurve.html");
		}

		#endregion

		#region ================== mxd. Settings panel

		protected override void SetupInterface()
		{
			// Load stored settings
			segmentlength = General.Clamp(General.Settings.ReadPluginSetting("drawcurvemode.segmentlength", 32), MIN_SEGMENT_LENGTH, MAX_SEGMENT_LENGTH);
			
			// Add options docker
			panel = new DrawCurveOptionsPanel(MIN_SEGMENT_LENGTH, MAX_SEGMENT_LENGTH);
			panel.SegmentLength = segmentlength;
			panel.OnValueChanged += OptionsPanelOnValueChanged;
			panel.OnContinuousDrawingChanged += OnContinuousDrawingChanged;
			panel.OnAutoCloseDrawingChanged += OnAutoCloseDrawingChanged;

			// Needs to be set after adding the events...
			panel.ContinuousDrawing = General.Settings.ReadPluginSetting("drawcurvemode.continuousdrawing", false);
			panel.AutoCloseDrawing = General.Settings.ReadPluginSetting("drawlinesmode.autoclosedrawing", false);
		}

		protected override void AddInterface()
		{
			panel.Register();
		}

		protected override void RemoveInterface()
		{
			// Store settings
			General.Settings.WritePluginSetting("drawcurvemode.segmentlength", segmentlength);
			General.Settings.WritePluginSetting("drawcurvemode.continuousdrawing", panel.ContinuousDrawing);
			General.Settings.WritePluginSetting("drawlinesmode.autoclosedrawing", panel.AutoCloseDrawing);

			// Remove the buttons
			panel.Unregister();
		}

		#endregion

		#region ================== Actions

		[BeginAction("increasesubdivlevel")]
		protected virtual void IncreaseSubdivLevel() 
		{
			if(segmentlength < MAX_SEGMENT_LENGTH) 
			{
				int increment = Math.Max(MIN_SEGMENT_LENGTH, segmentlength / 32 * 16);
				segmentlength += increment;

				if(segmentlength > MAX_SEGMENT_LENGTH) segmentlength = MAX_SEGMENT_LENGTH;
				panel.SegmentLength = segmentlength;
				Update();
			}
		}

		[BeginAction("decreasesubdivlevel")]
		protected virtual void DecreaseSubdivLevel() 
		{
			if(segmentlength > MIN_SEGMENT_LENGTH) 
			{
				int increment = Math.Max(MIN_SEGMENT_LENGTH, segmentlength / 32 * 16);
				segmentlength -= increment;

				if(segmentlength < MIN_SEGMENT_LENGTH) segmentlength = MIN_SEGMENT_LENGTH;
				panel.SegmentLength = segmentlength;
				Update();
			}
		}

		#endregion

	}
}