#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.Generic;
using System.Drawing;
using System.Windows.Forms;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Config;
using CodeImp.DoomBuilder.GZBuilder.Data; //mxd
using CodeImp.DoomBuilder.Types;
using CodeImp.DoomBuilder.GZBuilder.Tools;
using CodeImp.DoomBuilder.GZBuilder.Controls; //mxd

#endregion

namespace CodeImp.DoomBuilder.Windows
{
	internal partial class LinedefEditForm : DelayedForm
	{
		#region ================== Events

		public event EventHandler OnValuesChanged; //mxd

		#endregion

		#region ================== Constants


		#endregion

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

		private ICollection<Linedef> lines;
		private List<LinedefProperties> linedefProps; //mxd
		private bool preventchanges;
		private string arg0str; //mxd
		private bool haveArg0Str; //mxd
		private readonly string[] renderstyles; //mxd

		//mxd. Persistent settings
		private static bool linkFrontTopScale;
		private static bool linkFrontMidScale;
		private static bool linkFrontBottomScale;
		private static bool linkBackTopScale;
		private static bool linkBackMidScale;
		private static bool linkBackBottomScale;

		private readonly List<PairedFieldsControl> frontUdmfControls; //mxd
		private readonly List<PairedFieldsControl> backUdmfControls; //mxd

		//mxd. Window setup stuff
		private static Point location = Point.Empty;
		private static int activeTab;
		private static int activeFrontTab;
		private static int activeBackTab;

		private struct LinedefProperties //mxd
		{
			public readonly Dictionary<string, bool> Flags;
			public readonly float Alpha;

			public readonly SidedefProperties Front;
			public readonly SidedefProperties Back;

			public LinedefProperties(Linedef line) {
				Front = (line.Front != null ? new SidedefProperties(line.Front) : null);
				Back = (line.Back != null ? new SidedefProperties(line.Back) : null);
				Alpha = UDMFTools.GetFloat(line.Fields, "alpha", 1.0f);
				Flags = line.GetFlags();
			}
		}

		private class SidedefProperties //mxd
		{
			public readonly Dictionary<string, bool> Flags;

			public readonly float ScaleTopX;
			public readonly float ScaleTopY;
			public readonly float ScaleMidX;
			public readonly float ScaleMidY;
			public readonly float ScaleBottomX;
			public readonly float ScaleBottomY;

			public readonly int OffsetX;
			public readonly int OffsetY;

			public readonly float OffsetTopX;
			public readonly float OffsetTopY;
			public readonly float OffsetMidX;
			public readonly float OffsetMidY;
			public readonly float OffsetBottomX;
			public readonly float OffsetBottomY;

			public readonly int Brightness;
			public readonly bool AbsoluteBrightness;

			public readonly string TextureTop;
			public readonly string TextureMid;
			public readonly string TextureLow;

			public SidedefProperties(Sidedef side) {
				Flags = side.GetFlags();

				//offset
				OffsetX = side.OffsetX;
				OffsetY = side.OffsetY;

				Brightness = UDMFTools.GetInteger(side.Fields, "light", 0);
				AbsoluteBrightness = side.Fields.GetValue("lightabsolute", false);

				//scales
				ScaleTopX = UDMFTools.GetFloat(side.Fields, "scalex_top", 1.0f);
				ScaleTopY = UDMFTools.GetFloat(side.Fields, "scaley_top", 1.0f);
				ScaleMidX = UDMFTools.GetFloat(side.Fields, "scalex_mid", 1.0f);
				ScaleMidY = UDMFTools.GetFloat(side.Fields, "scaley_mid", 1.0f);
				ScaleBottomX = UDMFTools.GetFloat(side.Fields, "scalex_bottom", 1.0f);
				ScaleBottomY = UDMFTools.GetFloat(side.Fields, "scaley_bottom", 1.0f);

				//offsets
				OffsetTopX = UDMFTools.GetFloat(side.Fields, "offsetx_top", 0f);
				OffsetTopY = UDMFTools.GetFloat(side.Fields, "offsety_top", 0f);
				OffsetMidX = UDMFTools.GetFloat(side.Fields, "offsetx_mid", 0f);
				OffsetMidY = UDMFTools.GetFloat(side.Fields, "offsety_mid", 0f);
				OffsetBottomX = UDMFTools.GetFloat(side.Fields, "offsetx_bottom", 0f);
				OffsetBottomY = UDMFTools.GetFloat(side.Fields, "offsety_bottom", 0f);

				//textures
				TextureTop = side.HighTexture;
				TextureMid = side.MiddleTexture;
				TextureLow = side.LowTexture;
			}
		}

		#endregion

		#region ================== Constructor

		public LinedefEditForm()
		{
			// Initialize
			InitializeComponent();

			//mxd. Widow setup
			if(location != Point.Empty) {
				this.StartPosition = FormStartPosition.Manual;
				this.Location = location;
				if (activeTab > 0 && activeTab < tabs.TabCount) {
					tabs.SelectTab(activeTab);
				} else {
					activeTab = 0;
				}
				if(activeFrontTab > 0) udmfPropertiesFront.SelectTab(activeFrontTab);
				if(activeBackTab > 0) udmfPropertiesBack.SelectTab(activeBackTab);
			}
			
			// Fill flags lists
			foreach(KeyValuePair<string, string> lf in General.Map.Config.LinedefFlags)
				flags.Add(lf.Value, lf.Key);

			//mxd
			foreach(KeyValuePair<string, string> lf in General.Map.Config.SidedefFlags) {
				flagsFront.Add(lf.Value, lf.Key);
				flagsBack.Add(lf.Value, lf.Key);
			}

			// Fill actions list
			action.GeneralizedCategories = General.Map.Config.GenActionCategories;
			action.AddInfo(General.Map.Config.SortedLinedefActions.ToArray());

			// Fill activations list
			activation.Items.AddRange(General.Map.Config.LinedefActivates.ToArray());
			foreach(LinedefActivateInfo ai in General.Map.Config.LinedefActivates) udmfactivates.Add(ai.Title, ai);
			
			// Initialize image selectors
			fronthigh.Initialize();
			frontmid.Initialize();
			frontlow.Initialize();
			backhigh.Initialize();
			backmid.Initialize();
			backlow.Initialize();

			//mxd. Setup script numbers
			scriptNumbers.Location = arg0.Location;

			foreach(ScriptItem si in General.Map.NumberedScripts)
				scriptNumbers.Items.Add(si);

			scriptNumbers.DropDownWidth = Tools.GetDropDownWidth(scriptNumbers);

			if(General.Map.FormatInterface.HasCustomFields) { //mxd
				//mxd. Setup script names
				scriptNames.Location = arg0.Location;

				foreach(ScriptItem nsi in General.Map.NamedScripts)
					scriptNames.Items.Add(nsi);

				scriptNames.DropDownWidth = Tools.GetDropDownWidth(scriptNames);
				
				// Initialize custom fields editor
				fieldslist.Setup("linedef");

				// Fill universal fields list
				fieldslist.ListFixedFields(General.Map.Config.LinedefFields);

				//initialize controls
				frontUdmfControls = new List<PairedFieldsControl>() { pfcFrontOffsetTop, pfcFrontOffsetMid, pfcFrontOffsetBottom, pfcFrontScaleTop, pfcFrontScaleMid, pfcFrontScaleBottom };
				backUdmfControls = new List<PairedFieldsControl>() { pfcBackOffsetTop, pfcBackOffsetMid, pfcBackOffsetBottom, pfcBackScaleTop, pfcBackScaleMid, pfcBackScaleBottom };

				// Store renderstyle keys?
				if(General.Map.Config.LinedefRenderStyles.Count > 0) {
					renderstyles = new string[General.Map.Config.LinedefRenderStyles.Count];
					General.Map.Config.LinedefRenderStyles.Keys.CopyTo(renderstyles, 0);
				} else {
					renderStyle.Enabled = false;
				}

				// Fill renderstyles
				foreach(KeyValuePair<string, string> lf in General.Map.Config.LinedefRenderStyles) {
					renderStyle.Items.Add(lf.Value);
				}

				//Restore value linking
				pfcFrontScaleTop.LinkValues = linkFrontTopScale;
				pfcFrontScaleMid.LinkValues = linkFrontMidScale;
				pfcFrontScaleBottom.LinkValues = linkFrontBottomScale;
				pfcBackScaleTop.LinkValues = linkBackTopScale;
				pfcBackScaleMid.LinkValues = linkBackMidScale;
				pfcBackScaleBottom.LinkValues = linkBackBottomScale;
			} else {
				//Hide unused controls
				tabs.TabPages.Remove(tabcustom);

				settingsGroup.Visible = false;
				customfrontbutton.Visible = false;
				custombackbutton.Visible = false;
				labelLightFront.Visible = false;
				lightFront.Visible = false;
				cbLightAbsoluteFront.Visible = false;
				labelLightBack.Visible = false;
				lightBack.Visible = false;
				cbLightAbsoluteBack.Visible = false;
				udmfPropertiesFront.Visible = false;
				udmfPropertiesBack.Visible = false;
			}
			
			// Mixed activations? (UDMF)
			if(General.Map.FormatInterface.HasMixedActivations)
				udmfpanel.Visible = true;
			else if(General.Map.FormatInterface.HasPresetActivations)
				hexenpanel.Visible = true;
			
			// Action arguments?
			if(General.Map.FormatInterface.HasActionArgs)
				argspanel.Visible = true;
			
			// Arrange panels
			if(General.Map.FormatInterface.HasPresetActivations)
			{
				//mxd
				actiongroup.Top = settingsGroup.Top;
				actiongroup.Height = hexenpanel.Location.Y + hexenpanel.Height;
				this.Height = heightpanel1.Height;
			} else if(!General.Map.FormatInterface.HasMixedActivations &&
					!General.Map.FormatInterface.HasActionArgs &&
					!General.Map.FormatInterface.HasPresetActivations)
			{
				actiongroup.Top = settingsGroup.Top;
				actiongroup.Height = action.Bottom + action.Top + (actiongroup.Width - actiongroup.ClientRectangle.Width);
				this.Height = heightpanel2.Height;
			}
			
			// Tag?
			if(General.Map.FormatInterface.HasLinedefTag)
			{
				// Match position after the action group
				idgroup.Top = actiongroup.Bottom + actiongroup.Margin.Bottom + idgroup.Margin.Top;
			}
			else
			{
				idgroup.Visible = false;
			}
		}

		#endregion

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

		// This sets up the form to edit the given lines
		public void Setup(ICollection<Linedef> lines)
		{
			LinedefActivateInfo sai;
			Linedef fl;

			preventchanges = true;
			
			// Keep this list
			this.lines = lines;
			if(lines.Count > 1) this.Text = "Edit Linedefs (" + lines.Count + ")";
			linedefProps = new List<LinedefProperties>();

			//mxd. Make undo
			string undodesc = "linedef";
			if(lines.Count > 1)	undodesc = lines.Count + " linedefs";
			General.Map.UndoRedo.CreateUndo("Edit " + undodesc);
			
			////////////////////////////////////////////////////////////////////////
			// Set all options to the first linedef properties
			////////////////////////////////////////////////////////////////////////

			// Get first line
			fl = General.GetByIndex(lines, 0);
			
			// Flags
			foreach(CheckBox c in flags.Checkboxes)
				if(fl.Flags.ContainsKey(c.Tag.ToString())) c.Checked = fl.Flags[c.Tag.ToString()];
			
			// Activations
			foreach(LinedefActivateInfo ai in activation.Items)
				if((fl.Activate & ai.Index) == ai.Index) activation.SelectedItem = ai;

			// UDMF Activations
			foreach(CheckBox c in udmfactivates.Checkboxes)
			{
				LinedefActivateInfo ai = (c.Tag as LinedefActivateInfo);
				if(fl.Flags.ContainsKey(ai.Key)) c.Checked = fl.Flags[ai.Key];
			}

			//mxd. UDMF Settings
			if(General.Map.FormatInterface.HasCustomFields) {
				fieldslist.SetValues(fl.Fields, true); // Custom fields
				renderStyle.SelectedIndex = Array.IndexOf(renderstyles, fl.Fields.GetValue("renderstyle", "translucent"));
				alpha.Text = General.Clamp(fl.Fields.GetValue("alpha", 1.0f), 0f, 1f).ToString();
				lockNumber.Text = fl.Fields.GetValue("locknumber", 0).ToString();
				arg0str = fl.Fields.GetValue("arg0str", string.Empty);
				haveArg0Str = !string.IsNullOrEmpty(arg0str);
			}

			// Action/tags
			action.Value = fl.Action;

			if(General.Map.FormatInterface.HasLinedefTag) {//mxd
				tagSelector.Setup(UniversalType.LinedefTag);
				tagSelector.SetTag(fl.Tag);
			}

			arg0.SetValue(fl.Args[0]);
			arg1.SetValue(fl.Args[1]);
			arg2.SetValue(fl.Args[2]);
			arg3.SetValue(fl.Args[3]);
			arg4.SetValue(fl.Args[4]);
			
			// Front side and back side checkboxes
			frontside.Checked = (fl.Front != null);
			backside.Checked = (fl.Back != null);

			// Front settings
			if(fl.Front != null)
			{
				fronthigh.TextureName = fl.Front.HighTexture;
				frontmid.TextureName = fl.Front.MiddleTexture;
				frontlow.TextureName = fl.Front.LowTexture;
				fronthigh.Required = fl.Front.HighRequired();
				frontmid.Required = fl.Front.MiddleRequired();
				frontlow.Required = fl.Front.LowRequired();
				frontsector.Text = fl.Front.Sector.Index.ToString();

				//mxd
				if(General.Map.FormatInterface.HasCustomFields) {
					//front settings
					foreach(PairedFieldsControl pfc in frontUdmfControls)
						pfc.SetValuesFrom(fl.Front.Fields, true);

					lightFront.Text = UDMFTools.GetInteger(fl.Front.Fields, "light", 0).ToString();
					cbLightAbsoluteFront.Checked = fl.Front.Fields.GetValue("lightabsolute", false);
					
					//flags
					foreach(CheckBox c in flagsFront.Checkboxes)
						if(fl.Front.Flags.ContainsKey(c.Tag.ToString())) c.Checked = fl.Front.Flags[c.Tag.ToString()];
				}

				frontTextureOffset.SetValues(fl.Front.OffsetX, fl.Front.OffsetY, true); //mxd
			}

			// Back settings
			if(fl.Back != null)
			{
				backhigh.TextureName = fl.Back.HighTexture;
				backmid.TextureName = fl.Back.MiddleTexture;
				backlow.TextureName = fl.Back.LowTexture;
				backhigh.Required = fl.Back.HighRequired();
				backmid.Required = fl.Back.MiddleRequired();
				backlow.Required = fl.Back.LowRequired();
				backsector.Text = fl.Back.Sector.Index.ToString();

				//mxd
				if(General.Map.FormatInterface.HasCustomFields) {
					//front settings
					foreach(PairedFieldsControl pfc in backUdmfControls)
						pfc.SetValuesFrom(fl.Back.Fields, true);

					lightBack.Text = UDMFTools.GetInteger(fl.Back.Fields, "light", 0).ToString();
					cbLightAbsoluteBack.Checked = fl.Back.Fields.GetValue("lightabsolute", false);

					//flags
					foreach(CheckBox c in flagsBack.Checkboxes)
						if(fl.Back.Flags.ContainsKey(c.Tag.ToString()))	c.Checked = fl.Back.Flags[c.Tag.ToString()];
				}
 
				backTextureOffset.SetValues(fl.Back.OffsetX, fl.Back.OffsetY, true); //mxd
			}

			////////////////////////////////////////////////////////////////////////
			// Now go for all lines and change the options when a setting is different
			////////////////////////////////////////////////////////////////////////

			// Go for all lines
			foreach(Linedef l in lines)
			{
				// Flags
				foreach(CheckBox c in flags.Checkboxes)
				{
					if(c.CheckState == CheckState.Indeterminate) continue; //mxd
					if(l.IsFlagSet(c.Tag.ToString()) != c.Checked) 
					{
						c.ThreeState = true;
						c.CheckState = CheckState.Indeterminate;
					}
				}

				// Activations
				if(activation.Items.Count > 0)
				{
					sai = (activation.Items[0] as LinedefActivateInfo);
					foreach(LinedefActivateInfo ai in activation.Items)
						if((l.Activate & ai.Index) == ai.Index) sai = ai;
					if(sai != activation.SelectedItem) activation.SelectedIndex = -1;
				}

				// UDMF Activations
				foreach(CheckBox c in udmfactivates.Checkboxes)
				{
					if(c.CheckState == CheckState.Indeterminate) continue; //mxd

					LinedefActivateInfo ai = (c.Tag as LinedefActivateInfo);
					if(l.IsFlagSet(ai.Key) != c.Checked) 
					{
						c.ThreeState = true;
						c.CheckState = CheckState.Indeterminate;
					}
				}

				//mxd. UDMF Settings
				if(General.Map.FormatInterface.HasCustomFields) {
					if(renderstyles != null) {
						if(renderStyle.SelectedIndex > -1 && renderStyle.SelectedIndex != Array.IndexOf(renderstyles, l.Fields.GetValue("renderstyle", "translucent")))
							renderStyle.SelectedIndex = -1;
					}

					if(!string.IsNullOrEmpty(alpha.Text) && General.Clamp(alpha.GetResultFloat(1.0f), 0f, 1f) != l.Fields.GetValue("alpha", 1.0f))
						alpha.Text = string.Empty;

					if(!string.IsNullOrEmpty(lockNumber.Text) && lockNumber.GetResult(0) != l.Fields.GetValue("locknumber", 0))
						lockNumber.Text = string.Empty;

					if(arg0str != l.Fields.GetValue("arg0str", string.Empty)) {
						haveArg0Str = true;
						arg0str = string.Empty;
					}

					l.Fields.BeforeFieldsChange();
					fieldslist.SetValues(l.Fields, false);
				}

				// Action/tags
				if(l.Action != action.Value) action.Empty = true;
				if(General.Map.FormatInterface.HasLinedefTag && l.Tag != fl.Tag) tagSelector.ClearTag(); //mxd
				if(l.Args[0] != arg0.GetResult(-1)) arg0.ClearValue();
				if(l.Args[1] != arg1.GetResult(-1)) arg1.ClearValue();
				if(l.Args[2] != arg2.GetResult(-1)) arg2.ClearValue();
				if(l.Args[3] != arg3.GetResult(-1)) arg3.ClearValue();
				if(l.Args[4] != arg4.GetResult(-1)) arg4.ClearValue();
				
				// Front side checkbox
				if((l.Front != null) != frontside.Checked)
				{
					frontside.ThreeState = true;
					frontside.CheckState = CheckState.Indeterminate;
					frontside.AutoCheck = false;
				}

				// Back side checkbox
				if((l.Back != null) != backside.Checked)
				{
					backside.ThreeState = true;
					backside.CheckState = CheckState.Indeterminate;
					backside.AutoCheck = false;
				}

				// Front settings
				if(l.Front != null)
				{
					//mxd
					if (fronthigh.TextureName != l.Front.HighTexture) {
						if(!fronthigh.Required && l.Front.HighRequired()) fronthigh.Required = true;
						fronthigh.MultipleTextures = true; //mxd
						fronthigh.TextureName = string.Empty;
					}
					if (frontmid.TextureName != l.Front.MiddleTexture) {
						if(!frontmid.Required && l.Front.MiddleRequired()) frontmid.Required = true;
						frontmid.MultipleTextures = true; //mxd
						frontmid.TextureName = string.Empty;
					}
					if (frontlow.TextureName != l.Front.LowTexture) {
						if(!frontlow.Required && l.Front.LowRequired()) frontlow.Required = true;
						frontlow.MultipleTextures = true; //mxd
						frontlow.TextureName = string.Empty;
					}
					if(frontsector.Text != l.Front.Sector.Index.ToString()) frontsector.Text = string.Empty;

					//mxd
					if(General.Map.FormatInterface.HasCustomFields) {
						foreach(PairedFieldsControl pfc in frontUdmfControls)
							pfc.SetValuesFrom(l.Front.Fields, false);

						if(!string.IsNullOrEmpty(lightFront.Text)) {
							int light = UDMFTools.GetInteger(l.Front.Fields, "light", 0);
							if(light != lightFront.GetResult(light)) lightFront.Text = string.Empty;
						}
						
						if(l.Front.Fields.GetValue("lightabsolute", false) != cbLightAbsoluteFront.Checked) {
							cbLightAbsoluteFront.ThreeState = true;
							cbLightAbsoluteFront.CheckState = CheckState.Indeterminate;
						}

						//flags
						foreach(CheckBox c in flagsFront.Checkboxes) {
							if(c.CheckState == CheckState.Indeterminate) continue;
							if(l.Front.IsFlagSet(c.Tag.ToString()) != c.Checked) {
								c.ThreeState = true;
								c.CheckState = CheckState.Indeterminate;
							}
						}
					}

					l.Front.Fields.BeforeFieldsChange(); //mxd
					frontTextureOffset.SetValues(l.Front.OffsetX, l.Front.OffsetY, false); //mxd
				}

				// Back settings
				if(l.Back != null)
				{
					//mxd
					if (backhigh.TextureName != l.Back.HighTexture) {
						if(!backhigh.Required && l.Back.HighRequired()) backhigh.Required = true;
						backhigh.MultipleTextures = true; //mxd
						backhigh.TextureName = string.Empty;
					}
					if (backmid.TextureName != l.Back.MiddleTexture) {
						if(!backmid.Required && l.Back.MiddleRequired()) backmid.Required = true;
						backmid.MultipleTextures = true; //mxd
						backmid.TextureName = string.Empty;
					}
					if (backlow.TextureName != l.Back.LowTexture) {
						if(!backlow.Required && l.Back.LowRequired()) backlow.Required = true;
						backlow.MultipleTextures = true; //mxd
						backlow.TextureName = string.Empty;
					}
					if(backsector.Text != l.Back.Sector.Index.ToString()) backsector.Text = string.Empty;

					//mxd
					if(General.Map.FormatInterface.HasCustomFields) {
						foreach(PairedFieldsControl pfc in backUdmfControls)
							pfc.SetValuesFrom(l.Back.Fields, false);

						if(!string.IsNullOrEmpty(lightBack.Text)) {
							int light = UDMFTools.GetInteger(l.Back.Fields, "light", 0);
							if(light != lightBack.GetResult(light)) lightBack.Text = string.Empty;
						}

						if(l.Back.Fields.GetValue("lightabsolute", false) != cbLightAbsoluteBack.Checked) {
							cbLightAbsoluteBack.ThreeState = true;
							cbLightAbsoluteBack.CheckState = CheckState.Indeterminate;
						}

						//flags
						foreach(CheckBox c in flagsBack.Checkboxes) {
							if(c.CheckState == CheckState.Indeterminate) continue;
							if(l.Back.IsFlagSet(c.Tag.ToString()) != c.Checked) {
								c.ThreeState = true;
								c.CheckState = CheckState.Indeterminate;
							}
						}
					}

					l.Back.Fields.BeforeFieldsChange(); //mxd
					backTextureOffset.SetValues(l.Back.OffsetX, l.Back.OffsetY, false); //mxd
				}

				//mxd
				linedefProps.Add(new LinedefProperties(l));
			}
			
			// Refresh controls so that they show their image
			backhigh.Refresh();
			backmid.Refresh();
			backlow.Refresh();
			fronthigh.Refresh();
			frontmid.Refresh();
			frontlow.Refresh();

			preventchanges = false;

			updateScriptControls(); //mxd

			//mxd. Set intial script-related values, if required
			if(Array.IndexOf(GZBuilder.GZGeneral.ACS_SPECIALS, action.Value) != -1) {
				if(haveArg0Str) {
					scriptNames.Text = arg0str;
					arg0label.Text = "Script Name:";
				} else {
					int a0 = arg0.GetResult(0);
					if(a0 > 0) {
						for(int i = 0; i < General.Map.NumberedScripts.Count; i++) {
							if(General.Map.NumberedScripts[i].Index == a0) {
								scriptNumbers.SelectedIndex = i;
								break;
							}
						}

						if(scriptNumbers.SelectedIndex == -1) {
							scriptNumbers.Items.Add(new ScriptItem(a0, "Script " + a0));
							scriptNumbers.SelectedIndex = scriptNumbers.Items.Count - 1;
						}
					} else {
						scriptNumbers.Text = arg0.Text;
					}
				}
			} else {
				scriptNumbers.Text = "0";
			}
		}

		//mxd
		private void updateScriptControls() {
			if(Array.IndexOf(GZBuilder.GZGeneral.ACS_SPECIALS, action.Value) != -1) {
				bool showNamedScripts = General.Map.UDMF && haveArg0Str;
				cbArgStr.Visible = General.Map.UDMF;
				cbArgStr.Checked = showNamedScripts;
				scriptNames.Visible = showNamedScripts;
				scriptNumbers.Visible = !showNamedScripts;
			} else {
				cbArgStr.Visible = false;
				scriptNames.Visible = false;
				scriptNumbers.Visible = false;
				cbArgStr.Checked = false;
			}
		}

		#endregion

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

		// Apply clicked
		private void apply_Click(object sender, EventArgs e)
		{
			Sector s;
			int index;
			
			// Verify the tag
			if(General.Map.FormatInterface.HasLinedefTag)
			{
				tagSelector.ValidateTag(); //mxd
				if(((tagSelector.GetTag(0) < General.Map.FormatInterface.MinTag) || (tagSelector.GetTag(0) > General.Map.FormatInterface.MaxTag))) {
					General.ShowWarningMessage("Linedef tag must be between " + General.Map.FormatInterface.MinTag + " and " + General.Map.FormatInterface.MaxTag + ".", MessageBoxButtons.OK);
					return;
				}
			}
			
			// Verify the action
			if((action.Value < General.Map.FormatInterface.MinAction) || (action.Value > General.Map.FormatInterface.MaxAction))
			{
				General.ShowWarningMessage("Linedef action must be between " + General.Map.FormatInterface.MinAction + " and " + General.Map.FormatInterface.MaxAction + ".", MessageBoxButtons.OK);
				return;
			}

			//mxd
			bool hasAcs = !action.Empty && Array.IndexOf(GZBuilder.GZGeneral.ACS_SPECIALS, action.Value) != -1;
			int lockNum = lockNumber.GetResult(0);
			
			// Go for all the lines
			int tagoffset = 0; //mxd
			foreach(Linedef l in lines)
			{
				// Apply chosen activation flag
				if(activation.SelectedIndex > -1)
					l.Activate = (activation.SelectedItem as LinedefActivateInfo).Index;
				
				// UDMF activations
				foreach(CheckBox c in udmfactivates.Checkboxes)
				{
					LinedefActivateInfo ai = (c.Tag as LinedefActivateInfo);
					if(c.CheckState == CheckState.Checked) l.SetFlag(ai.Key, true);
					else if(c.CheckState == CheckState.Unchecked) l.SetFlag(ai.Key, false);
				}
				
				// Action/tags
				l.Tag = General.Clamp(tagSelector.GetTag(l.Tag, tagoffset++), General.Map.FormatInterface.MinTag, General.Map.FormatInterface.MaxTag); //mxd
				if(!action.Empty) {
					l.Action = action.Value;

					//mxd. Script name/number handling
					if(hasAcs) {
						if(!cbArgStr.Checked) { //apply script number
							if(!string.IsNullOrEmpty(scriptNumbers.Text)) {
								if(scriptNumbers.SelectedItem != null)
									l.Args[0] = ((ScriptItem)scriptNumbers.SelectedItem).Index;
								else if(!int.TryParse(scriptNumbers.Text.Trim(), out l.Args[0]))
									l.Args[0] = 0;

								if(l.Fields.ContainsKey("arg0str")) l.Fields.Remove("arg0str");
							}
						} else { //apply arg0str
							if(!string.IsNullOrEmpty(scriptNames.Text)) 
								l.Fields["arg0str"] = new UniValue(UniversalType.String, scriptNames.Text);
						}
					} else {
						l.Args[0] = arg0.GetResult(l.Args[0]);
						if(l.Fields.ContainsKey("arg0str")) l.Fields.Remove("arg0str");
					}
				}else{
					l.Args[0] = arg0.GetResult(l.Args[0]);
				}

				l.Args[1] = arg1.GetResult(l.Args[1]);
				l.Args[2] = arg2.GetResult(l.Args[2]);
				l.Args[3] = arg3.GetResult(l.Args[3]);
				l.Args[4] = arg4.GetResult(l.Args[4]);
				
				// Remove front side?
				if((l.Front != null) && (frontside.CheckState == CheckState.Unchecked))
				{
					l.Front.Dispose();
				}
				// Create or modify front side?
				else if(frontside.CheckState == CheckState.Checked)
				{
					// Make sure we have a valid sector (make a new one if needed)
					if(l.Front != null) index = l.Front.Sector.Index; else index = -1;
					index = frontsector.GetResult(index);
					if((index > -1) && (index < General.Map.Map.Sectors.Count))
					{
						s = General.Map.Map.GetSectorByIndex(index);
						if(s == null) s = General.Map.Map.CreateSector();
						
						if(s != null)
						{
							// Create new sidedef?
							if(l.Front == null) General.Map.Map.CreateSidedef(l, true, s);

							// Change sector?
							if(l.Front != null && l.Front.Sector != s) l.Front.SetSector(s);
						}
					}
				}

				// Remove back side?
				if((l.Back != null) && (backside.CheckState == CheckState.Unchecked))
				{
					l.Back.Dispose();
				}
				// Create or modify back side?
				else if(backside.CheckState == CheckState.Checked)
				{
					// Make sure we have a valid sector (make a new one if needed)
					if(l.Back != null) index = l.Back.Sector.Index; else index = -1;
					index = backsector.GetResult(index);
					if((index > -1) && (index < General.Map.Map.Sectors.Count))
					{
						s = General.Map.Map.GetSectorByIndex(index);
						if(s == null) s = General.Map.Map.CreateSector();
						
						if(s != null)
						{
							// Create new sidedef?
							if(l.Back == null) General.Map.Map.CreateSidedef(l, false, s);
							
							// Change sector?
							if(l.Back != null && l.Back.Sector != s) l.Back.SetSector(s);
						}
					}
				}

				//mxd. UDMF Settings
				if(General.Map.FormatInterface.HasCustomFields) {
					fieldslist.Apply(l.Fields);
					UDMFTools.SetInteger(l.Fields, "locknumber", lockNum, 0);
				}
			}

			//mxd. Store value linking
			linkFrontTopScale = pfcFrontScaleTop.LinkValues;
			linkFrontMidScale = pfcFrontScaleMid.LinkValues;
			linkFrontBottomScale = pfcFrontScaleBottom.LinkValues;
			linkBackTopScale = pfcBackScaleTop.LinkValues;
			linkBackMidScale = pfcBackScaleMid.LinkValues;
			linkBackBottomScale = pfcBackScaleBottom.LinkValues;

			// Update the used textures
			General.Map.Data.UpdateUsedTextures();
			
			// Done
			General.Map.IsChanged = true;
			if(OnValuesChanged != null)	OnValuesChanged(this, EventArgs.Empty); //mxd
			this.DialogResult = DialogResult.OK;
			this.Close();
		}

		// Cancel clicked
		private void cancel_Click(object sender, EventArgs e)
		{
			//mxd. Let's pretend nothing of this really happened...
			General.Map.UndoRedo.WithdrawUndo();
			
			// Be gone
			this.DialogResult = DialogResult.Cancel;
			this.Close();
		}

		// Front side (un)checked
		private void frontside_CheckStateChanged(object sender, EventArgs e) 
		{
			// Enable/disable panel
			// NOTE: Also enabled when checkbox is grayed!
			frontgroup.Enabled = (frontside.CheckState != CheckState.Unchecked);
		}

		// Back side (un)checked
		private void backside_CheckStateChanged(object sender, EventArgs e) 
		{
			// Enable/disable panel
			// NOTE: Also enabled when checkbox is grayed!
			backgroup.Enabled = (backside.CheckState != CheckState.Unchecked);
		}

		// Action changes
		private void action_ValueChanges(object sender, EventArgs e)
		{
			int showaction = 0;
			
			// Only when line type is known
			if(General.Map.Config.LinedefActions.ContainsKey(action.Value)) showaction = action.Value;
			
			// Change the argument descriptions
			arg0label.Text = General.Map.Config.LinedefActions[showaction].Args[0].Title + ":";
			arg1label.Text = General.Map.Config.LinedefActions[showaction].Args[1].Title + ":";
			arg2label.Text = General.Map.Config.LinedefActions[showaction].Args[2].Title + ":";
			arg3label.Text = General.Map.Config.LinedefActions[showaction].Args[3].Title + ":";
			arg4label.Text = General.Map.Config.LinedefActions[showaction].Args[4].Title + ":";
			arg0label.Enabled = General.Map.Config.LinedefActions[showaction].Args[0].Used;
			arg1label.Enabled = General.Map.Config.LinedefActions[showaction].Args[1].Used;
			arg2label.Enabled = General.Map.Config.LinedefActions[showaction].Args[2].Used;
			arg3label.Enabled = General.Map.Config.LinedefActions[showaction].Args[3].Used;
			arg4label.Enabled = General.Map.Config.LinedefActions[showaction].Args[4].Used;
			if(arg0label.Enabled) arg0.ForeColor = SystemColors.WindowText; else arg0.ForeColor = SystemColors.GrayText;
			if(arg1label.Enabled) arg1.ForeColor = SystemColors.WindowText; else arg1.ForeColor = SystemColors.GrayText;
			if(arg2label.Enabled) arg2.ForeColor = SystemColors.WindowText; else arg2.ForeColor = SystemColors.GrayText;
			if(arg3label.Enabled) arg3.ForeColor = SystemColors.WindowText; else arg3.ForeColor = SystemColors.GrayText;
			if(arg4label.Enabled) arg4.ForeColor = SystemColors.WindowText; else arg4.ForeColor = SystemColors.GrayText;
			arg0.Setup(General.Map.Config.LinedefActions[showaction].Args[0]);
			arg1.Setup(General.Map.Config.LinedefActions[showaction].Args[1]);
			arg2.Setup(General.Map.Config.LinedefActions[showaction].Args[2]);
			arg3.Setup(General.Map.Config.LinedefActions[showaction].Args[3]);
			arg4.Setup(General.Map.Config.LinedefActions[showaction].Args[4]);

			// mxd. Apply action's default arguments 
			if(!preventchanges) {
				if(showaction != 0 && General.Map.Config.LinedefActions.ContainsKey(showaction)) {
					arg0.SetDefaultValue();
					arg1.SetDefaultValue();
					arg2.SetDefaultValue();
					arg3.SetDefaultValue();
					arg4.SetDefaultValue();
				} else { //or set them to 0
					arg0.SetValue(0);
					arg1.SetValue(0);
					arg2.SetValue(0);
					arg3.SetValue(0);
					arg4.SetValue(0);
				}
			} 

			if(!preventchanges) updateScriptControls(); //mxd
		}

		// Browse Action clicked
		private void browseaction_Click(object sender, EventArgs e)
		{
			action.Value = ActionBrowserForm.BrowseAction(this, action.Value);
		}

		//mxd
		private void cbArgStr_CheckedChanged(object sender, EventArgs e) {
			if(!cbArgStr.Visible) return;
			scriptNames.Visible = cbArgStr.Checked;
			scriptNumbers.Visible = !cbArgStr.Checked;
			arg0label.Text = cbArgStr.Checked ? "Script Name:" : "Script Number:";
		}

		//mxd
		private void tabcustom_MouseEnter(object sender, EventArgs e) {
			fieldslist.Focus();
		}

		//mxd. Store window location
		private void LinedefEditForm_FormClosing(object sender, FormClosingEventArgs e) {
			location = this.Location;
			activeTab = tabs.SelectedIndex;
			activeFrontTab = udmfPropertiesFront.SelectedIndex;
			activeBackTab = udmfPropertiesBack.SelectedIndex;
		}

		// Help!
		private void LinedefEditForm_HelpRequested(object sender, HelpEventArgs hlpevent)
		{
			General.ShowHelp("w_linedefedit.html");
			hlpevent.Handled = true;
		}

		#endregion

		#region ================== mxd. Realtime events (linedef)

		private void cbRenderStyle_SelectedIndexChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//update values
			foreach(Linedef l in lines)
				UDMFTools.SetString(l.Fields, "renderstyle", renderstyles[renderStyle.SelectedIndex], "translucent");

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}
		
		private void alpha_WhenTextChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			//restore values
			if(string.IsNullOrEmpty(alpha.Text)) {
				foreach(Linedef l in lines) 
					UDMFTools.SetFloat(l.Fields, "alpha", linedefProps[i++].Alpha, 1.0f);
			//update values
			} else {
				foreach(Linedef l in lines) {
					float value = General.Clamp(alpha.GetResultFloat(l.Fields.GetValue("alpha", 1.0f)), 0f, 1.0f);
					UDMFTools.SetFloat(l.Fields, "alpha", value, 1.0f);
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null)	OnValuesChanged(this, EventArgs.Empty);
		}

		private void flags_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				// Apply all flags
				foreach(CheckBox c in flags.Checkboxes) {
					if(c.CheckState == CheckState.Checked)
						l.SetFlag(c.Tag.ToString(), true);
					else if(c.CheckState == CheckState.Unchecked)
						l.SetFlag(c.Tag.ToString(), false);
					else
						l.SetFlag(c.Tag.ToString(), linedefProps[i].Flags[c.Tag.ToString()]);

				}

				i++;
			}
			
			General.Map.IsChanged = true;
			if(OnValuesChanged != null)	OnValuesChanged(this, EventArgs.Empty);
		}

		#endregion

		#region Reltime events (sides)

			#region Custom fields changed

		// Custom fields on front sides
		private void customfrontbutton_Click(object sender, EventArgs e) {
			// Make collection of front sides
			List<MapElement> sides = new List<MapElement>(lines.Count);
			foreach(Linedef l in lines) if(l.Front != null) sides.Add(l.Front);

			if(!CustomFieldsForm.ShowDialog(this, "Front side custom fields", "sidedef", sides, General.Map.Config.SidedefFields)) return;

			//Apply values
			Sidedef fs = General.GetByIndex(sides, 0) as Sidedef;

			//..to the first side
			foreach(PairedFieldsControl pfc in frontUdmfControls)
				pfc.SetValuesFrom(fs.Fields, true);

			lightFront.Text = UDMFTools.GetInteger(fs.Fields, "light", 0).ToString();
			cbLightAbsoluteFront.ThreeState = false;
			cbLightAbsoluteFront.Checked = fs.Fields.GetValue("lightabsolute", false);
					
			//flags
			foreach(CheckBox c in flagsFront.Checkboxes)
				if(fs.Flags.ContainsKey(c.Tag.ToString())) c.Checked = fs.Flags[c.Tag.ToString()];

			//..then to all of them
			foreach(Sidedef s in sides){
				foreach(PairedFieldsControl pfc in frontUdmfControls)
					pfc.SetValuesFrom(s.Fields, false);

				if(!string.IsNullOrEmpty(lightFront.Text)) {
					int light = UDMFTools.GetInteger(s.Fields, "light", 0);
					if(light != lightFront.GetResult(light)) lightFront.Text = string.Empty;
				}

				if(s.Fields.GetValue("lightabsolute", false) != cbLightAbsoluteFront.Checked) {
					cbLightAbsoluteFront.ThreeState = true;
					cbLightAbsoluteFront.CheckState = CheckState.Indeterminate;
				}

				//flags
				foreach(CheckBox c in flagsFront.Checkboxes) {
					if(c.CheckState == CheckState.Indeterminate) continue;

					if(s.Flags.ContainsKey(c.Tag.ToString())) {
						if(s.Flags[c.Tag.ToString()] != c.Checked) {
							c.ThreeState = true;
							c.CheckState = CheckState.Indeterminate;
						}
					}
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		// Custom fields on back sides
		private void custombackbutton_Click(object sender, EventArgs e) {
			// Make collection of back sides
			List<MapElement> sides = new List<MapElement>(lines.Count);
			foreach(Linedef l in lines) if(l.Back != null) sides.Add(l.Back);

			// Edit these
			if(!CustomFieldsForm.ShowDialog(this, "Back side custom fields", "sidedef", sides, General.Map.Config.SidedefFields)) return;

			//Apply values
			Sidedef fs = General.GetByIndex(sides, 0) as Sidedef;

			//..to the first side
			foreach(PairedFieldsControl pfc in backUdmfControls)
				pfc.SetValuesFrom(fs.Fields, true);

			lightBack.Text = UDMFTools.GetInteger(fs.Fields, "light", 0).ToString();
			cbLightAbsoluteBack.ThreeState = false;
			cbLightAbsoluteBack.Checked = fs.Fields.GetValue("lightabsolute", false);

			//flags
			foreach(CheckBox c in flagsBack.Checkboxes)
				if(fs.Flags.ContainsKey(c.Tag.ToString())) c.Checked = fs.Flags[c.Tag.ToString()];

			//..then to all of them
			foreach(Sidedef s in sides) {
				foreach(PairedFieldsControl pfc in backUdmfControls)
					pfc.SetValuesFrom(s.Fields, false);

				if(!string.IsNullOrEmpty(lightBack.Text)) {
					int light = UDMFTools.GetInteger(s.Fields, "light", 0);
					if(light != lightBack.GetResult(light)) lightBack.Text = string.Empty;
				}

				if(s.Fields.GetValue("lightabsolute", false) != cbLightAbsoluteBack.Checked) {
					cbLightAbsoluteBack.ThreeState = true;
					cbLightAbsoluteBack.CheckState = CheckState.Indeterminate;
				}

				//flags
				foreach(CheckBox c in flagsBack.Checkboxes) {
					if(c.CheckState == CheckState.Indeterminate) continue;

					if(s.Flags.ContainsKey(c.Tag.ToString())) {
						if(s.Flags[c.Tag.ToString()] != c.Checked) {
							c.ThreeState = true;
							c.CheckState = CheckState.Indeterminate;
						}
					}
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

			#region Texture changed

		private void fronthigh_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//restore values
			if(string.IsNullOrEmpty(fronthigh.TextureName)) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Front != null) l.Front.SetTextureHigh(linedefProps[i].Front != null ? linedefProps[i].Front.TextureTop : "-");
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines) 
					if(l.Front != null)	l.Front.SetTextureHigh(fronthigh.GetResult(l.Front.HighTexture));
			}

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

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void frontmid_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//restore values
			if(string.IsNullOrEmpty(frontmid.TextureName)) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Front != null) l.Front.SetTextureMid(linedefProps[i].Front != null ? linedefProps[i].Front.TextureMid : "-");
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines) 
					if(l.Front != null)	l.Front.SetTextureMid(frontmid.GetResult(l.Front.MiddleTexture));
			}

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

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void frontlow_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//restore values
			if(string.IsNullOrEmpty(frontlow.TextureName)) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Front != null) l.Front.SetTextureLow(linedefProps[i].Front != null ? linedefProps[i].Front.TextureLow : "-");
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines)
					if(l.Front != null) l.Front.SetTextureLow(frontlow.GetResult(l.Front.LowTexture));
			}

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

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void backhigh_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//restore values
			if(string.IsNullOrEmpty(backhigh.TextureName)) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Back != null) l.Back.SetTextureHigh(linedefProps[i].Back != null ? linedefProps[i].Back.TextureTop : "-");
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines)
					if(l.Back != null) l.Back.SetTextureHigh(backhigh.GetResult(l.Back.HighTexture));
			}

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

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void backmid_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//restore values
			if(string.IsNullOrEmpty(backmid.TextureName)) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Back != null) l.Back.SetTextureMid(linedefProps[i].Back != null ? linedefProps[i].Back.TextureMid : "-");
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines)
					if(l.Back != null) l.Back.SetTextureMid(backmid.GetResult(l.Back.MiddleTexture));
			}

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

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void backlow_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			//restore values
			if(string.IsNullOrEmpty(backlow.TextureName)) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Back != null) l.Back.SetTextureLow(linedefProps[i].Back != null ? linedefProps[i].Back.TextureLow : "-");
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines)
					if(l.Back != null) l.Back.SetTextureLow(backlow.GetResult(l.Back.LowTexture));
			}

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

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

			#region Brightness changed

		private void lightFront_WhenTextChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			//restore values
			if(string.IsNullOrEmpty(lightFront.Text)) {
				foreach(Linedef l in lines) {
					if(l.Front != null)
						UDMFTools.SetInteger(l.Front.Fields, "light", (linedefProps[i].Front != null ? linedefProps[i].Front.Brightness : 0), 0);
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines) {
					if(l.Front != null) {
						bool absolute = false;
						if(cbLightAbsoluteFront.CheckState == CheckState.Indeterminate) {
							absolute = l.Front.Fields.GetValue("lightabsolute", false);
						} else if(cbLightAbsoluteFront.CheckState == CheckState.Checked) {
							absolute = true;
						}

						int value = General.Clamp(lightFront.GetResult((linedefProps[i].Front != null ? linedefProps[i].Front.Brightness : 0)), (absolute ? 0 : -255), 255);
						UDMFTools.SetInteger(l.Front.Fields, "light", value, 0);
					}
					i++;
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void lightBack_WhenTextChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			//restore values
			if(string.IsNullOrEmpty(lightBack.Text)) {
				foreach(Linedef l in lines) {
					if(l.Back != null)
						UDMFTools.SetInteger(l.Back.Fields, "light", (linedefProps[i].Back != null ? linedefProps[i].Back.Brightness : 0), 0);
					i++;
				}
			//update values
			} else {
				foreach(Linedef l in lines) {
					if(l.Back != null) {
						bool absolute = false;
						if(cbLightAbsoluteBack.CheckState == CheckState.Indeterminate) {
							absolute = l.Back.Fields.GetValue("lightabsolute", false);
						} else if(cbLightAbsoluteBack.CheckState == CheckState.Checked) {
							absolute = true;
						}

						int value = General.Clamp(lightBack.GetResult((linedefProps[i].Back != null ? linedefProps[i].Back.Brightness : 0)), (absolute ? 0 : -255), 255);
						UDMFTools.SetInteger(l.Back.Fields, "light", value, 0);
					}
					i++;
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void cbLightAbsoluteFront_CheckedChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			if(cbLightAbsoluteFront.Checked) {
				foreach(Linedef l in lines) {
					if(l.Front == null) continue;
					l.Front.Fields["lightabsolute"] = new UniValue(UniversalType.Boolean, true);
				}
			} else if(cbLightAbsoluteFront.CheckState == CheckState.Indeterminate) {
				int i = 0;

				foreach(Linedef l in lines) {
					if(l.Front != null) {
						if(linedefProps[i].Front != null && linedefProps[i].Front.AbsoluteBrightness) {
							l.Front.Fields["lightabsolute"] = new UniValue(UniversalType.Boolean, true);
						} else if(l.Front.Fields.ContainsKey("lightabsolute")) {
							l.Front.Fields.Remove("lightabsolute");
						}
					}
					i++;
				}
			} else {
				foreach(Linedef l in lines) {
					if(l.Front == null) continue;
					if(l.Front.Fields.ContainsKey("lightabsolute")) l.Front.Fields.Remove("lightabsolute");
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void cbLightAbsoluteBack_CheckedChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			if(cbLightAbsoluteBack.Checked) {
				foreach(Linedef l in lines) {
					if(l.Back == null) continue;
					l.Back.Fields["lightabsolute"] = new UniValue(UniversalType.Boolean, true);
				}
			} else if(cbLightAbsoluteBack.CheckState == CheckState.Indeterminate) {
				int i = 0;
				
				foreach(Linedef l in lines) {
					if(l.Back != null) {
						if(linedefProps[i].Back != null && linedefProps[i].Back.AbsoluteBrightness) {
							l.Back.Fields["lightabsolute"] = new UniValue(UniversalType.Boolean, true);
						} else if(l.Back.Fields.ContainsKey("lightabsolute")) {
							l.Back.Fields.Remove("lightabsolute");
						}
					}
					i++;
				}
			} else {
				foreach(Linedef l in lines) {
					if(l.Back == null) continue;
					if(l.Back.Fields.ContainsKey("lightabsolute")) l.Back.Fields.Remove("lightabsolute");
				}
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

			#region Global texture offsets changed

		private void frontTextureOffset_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					if(linedefProps[i].Front != null) {
						l.Front.OffsetX = frontTextureOffset.GetValue1(linedefProps[i].Front.OffsetX);
						l.Front.OffsetY = frontTextureOffset.GetValue2(linedefProps[i].Front.OffsetY);
					} else {
						l.Front.OffsetX = frontTextureOffset.GetValue1(0);
						l.Front.OffsetY = frontTextureOffset.GetValue2(0);
					}
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void backTextureOffset_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;

			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					if(linedefProps[i].Back != null) {
						l.Back.OffsetX = backTextureOffset.GetValue1(linedefProps[i].Back.OffsetX);
						l.Back.OffsetY = backTextureOffset.GetValue2(linedefProps[i].Back.OffsetY);
					} else {
						l.Back.OffsetX = backTextureOffset.GetValue1(0);
						l.Back.OffsetY = backTextureOffset.GetValue2(0);
					}
				}

				i++;
			}
			
			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

			#region Texture offsets changed

		private void pfcFrontOffsetTop_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					float oldX = linedefProps[i].Front != null ? linedefProps[i].Front.OffsetTopX : 0f;
					float oldY = linedefProps[i].Front != null ? linedefProps[i].Front.OffsetTopY : 0f;
					pfcFrontOffsetTop.ApplyTo(l.Front.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}
				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcFrontOffsetMid_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					float oldX = linedefProps[i].Front != null ? linedefProps[i].Front.OffsetMidX : 0f;
					float oldY = linedefProps[i].Front != null ? linedefProps[i].Front.OffsetMidY : 0f;
					pfcFrontOffsetMid.ApplyTo(l.Front.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcFrontOffsetBottom_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					float oldX = linedefProps[i].Front != null ? linedefProps[i].Front.OffsetBottomX : 0f;
					float oldY = linedefProps[i].Front != null ? linedefProps[i].Front.OffsetBottomY : 0f;
					pfcFrontOffsetBottom.ApplyTo(l.Front.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcBackOffsetTop_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					float oldX = linedefProps[i].Back != null ? linedefProps[i].Back.OffsetTopX : 0f;
					float oldY = linedefProps[i].Back != null ? linedefProps[i].Back.OffsetTopY : 0f;
					pfcBackOffsetTop.ApplyTo(l.Back.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcBackOffsetMid_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					float oldX = linedefProps[i].Back != null ? linedefProps[i].Back.OffsetMidX : 0f;
					float oldY = linedefProps[i].Back != null ? linedefProps[i].Back.OffsetMidY : 0f;
					pfcBackOffsetMid.ApplyTo(l.Back.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcBackOffsetBottom_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					float oldX = linedefProps[i].Back != null ? linedefProps[i].Back.OffsetBottomX : 0f;
					float oldY = linedefProps[i].Back != null ? linedefProps[i].Back.OffsetBottomY : 0f;
					pfcBackOffsetBottom.ApplyTo(l.Back.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

			#region Scale changed

		private void pfcFrontScaleTop_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					float oldX = linedefProps[i].Front != null ? linedefProps[i].Front.ScaleTopX : 1.0f;
					float oldY = linedefProps[i].Front != null ? linedefProps[i].Front.ScaleTopY : 1.0f;
					pfcFrontScaleTop.ApplyTo(l.Front.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcFrontScaleMid_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					float oldX = linedefProps[i].Front != null ? linedefProps[i].Front.ScaleMidX : 1.0f;
					float oldY = linedefProps[i].Front != null ? linedefProps[i].Front.ScaleMidY : 1.0f;
					pfcFrontScaleMid.ApplyTo(l.Front.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcFrontScaleBottom_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front != null) {
					float oldX = linedefProps[i].Front != null ? linedefProps[i].Front.ScaleBottomX : 1.0f;
					float oldY = linedefProps[i].Front != null ? linedefProps[i].Front.ScaleBottomY : 1.0f;
					pfcFrontScaleBottom.ApplyTo(l.Front.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcBackScaleTop_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					float oldX = linedefProps[i].Back != null ? linedefProps[i].Back.ScaleTopX : 1.0f;
					float oldY = linedefProps[i].Back != null ? linedefProps[i].Back.ScaleTopY : 1.0f;
					pfcBackScaleTop.ApplyTo(l.Back.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcBackScaleMid_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					float oldX = linedefProps[i].Back != null ? linedefProps[i].Back.ScaleMidX : 1.0f;
					float oldY = linedefProps[i].Back != null ? linedefProps[i].Back.ScaleMidY : 1.0f;
					pfcBackScaleMid.ApplyTo(l.Back.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void pfcBackScaleBottom_OnValuesChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back != null) {
					float oldX = linedefProps[i].Back != null ? linedefProps[i].Back.ScaleBottomX : 1.0f;
					float oldY = linedefProps[i].Back != null ? linedefProps[i].Back.ScaleBottomY : 1.0f;
					pfcBackScaleBottom.ApplyTo(l.Back.Fields, General.Map.FormatInterface.MinTextureOffset, General.Map.FormatInterface.MaxTextureOffset, oldX, oldY);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

			#region Flags cahnged

		private void flagsFront_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Front == null) continue;
				
				// Apply all flags
				foreach(CheckBox c in flagsFront.Checkboxes) {
					if(c.CheckState == CheckState.Checked)
						l.Front.SetFlag(c.Tag.ToString(), true);
					else if(c.CheckState == CheckState.Unchecked)
						l.Front.SetFlag(c.Tag.ToString(), false);
					else
						l.Front.SetFlag(c.Tag.ToString(), linedefProps[i].Front.Flags[c.Tag.ToString()]);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

		private void flagsBack_OnValueChanged(object sender, EventArgs e) {
			if(preventchanges) return;
			int i = 0;

			foreach(Linedef l in lines) {
				if(l.Back == null) continue;

				// Apply all flags
				foreach(CheckBox c in flagsBack.Checkboxes) {
					if(c.CheckState == CheckState.Checked)
						l.Back.SetFlag(c.Tag.ToString(), true);
					else if(c.CheckState == CheckState.Unchecked)
						l.Back.SetFlag(c.Tag.ToString(), false);
					else
						l.Back.SetFlag(c.Tag.ToString(), linedefProps[i].Back.Flags[c.Tag.ToString()]);
				}

				i++;
			}

			General.Map.IsChanged = true;
			if(OnValuesChanged != null) OnValuesChanged(this, EventArgs.Empty);
		}

			#endregion

		#endregion

	}
}