#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.Map;
using CodeImp.DoomBuilder.Types;

#endregion

namespace CodeImp.DoomBuilder.Windows
{
	internal partial class SectorEditForm : DelayedForm, ISectorEditForm
	{
		#region ================== Events

		public event EventHandler OnValuesChanged; //mxd

		#endregion

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

		private ICollection<Sector> sectors;
		private List<SectorProperties> sectorprops; //mxd
		private bool preventchanges; //mxd
		private bool undocreated; //mxd
		private bool oldmapischanged;

		private struct SectorProperties //mxd
		{
			public readonly int Brightness;
			public readonly int FloorHeight;
			public readonly int CeilHeight;
			public readonly string FloorTexture;
			public readonly string CeilTexture;

			public SectorProperties(Sector s) 
			{
				Brightness = s.Brightness;
				FloorHeight = s.FloorHeight;
				CeilHeight = s.CeilHeight;
				FloorTexture = s.FloorTexture;
				CeilTexture = s.CeilTexture;
			}
		}

		#endregion

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

		// Constructor
		public SectorEditForm()
		{
			// Initialize
			InitializeComponent();

			// Fill effects list
			effect.GeneralizedOptions = General.Map.Config.GenEffectOptions; //mxd
			effect.AddInfo(General.Map.Config.SortedSectorEffects.ToArray());

			// Initialize image selectors
			floortex.Initialize();
			ceilingtex.Initialize();

			// Set steps for brightness field
			brightness.StepValues = General.Map.Config.BrightnessLevels;
		}

		#endregion

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

		// This sets up the form to edit the given sectors
		public void Setup(ICollection<Sector> sectors)
		{
			preventchanges = true; //mxd
			oldmapischanged = General.Map.IsChanged;
			undocreated = false;
            // Keep this list
            this.sectors = sectors;
			if(sectors.Count > 1) this.Text = "Edit Sectors (" + sectors.Count + ")";
			sectorprops = new List<SectorProperties>(); //mxd

			//mxd. Set default height offset
			heightoffset.Text = "0";

			////////////////////////////////////////////////////////////////////////
			// Set all options to the first sector properties
			////////////////////////////////////////////////////////////////////////

			// Get first sector
			Sector sc = General.GetByIndex(sectors, 0);

			// Effects
			effect.Value = sc.Effect;
			brightness.Text = sc.Brightness.ToString();

			// Floor/ceiling
			floorheight.Text = sc.FloorHeight.ToString();
			ceilingheight.Text = sc.CeilHeight.ToString();
			floortex.TextureName = sc.FloorTexture;
			ceilingtex.TextureName = sc.CeilTexture;

			// Action
			tagSelector.Setup(UniversalType.SectorTag); //mxd
			tagSelector.SetTag(sc.Tag);//mxd
			
			////////////////////////////////////////////////////////////////////////
			// Now go for all sectors and change the options when a setting is different
			////////////////////////////////////////////////////////////////////////

			// Go for all sectors
			foreach(Sector s in sectors)
			{
				// Effects
				if(s.Effect != effect.Value) effect.Empty = true;
				if(s.Brightness.ToString() != brightness.Text) brightness.Text = "";

				// Floor/Ceiling
				if(s.FloorHeight.ToString() != floorheight.Text) floorheight.Text = "";
				if(s.CeilHeight.ToString() != ceilingheight.Text) ceilingheight.Text = "";
				if(s.FloorTexture != floortex.TextureName) 
				{
					floortex.MultipleTextures = true; //mxd
					floortex.TextureName = "";
				}
				if(s.CeilTexture != ceilingtex.TextureName) 
				{
					ceilingtex.MultipleTextures = true; //mxd
					ceilingtex.TextureName = "";
				}

				// Action
				if(s.Tag != sc.Tag)	tagSelector.ClearTag(); //mxd

				//mxd. Store initial properties
				sectorprops.Add(new SectorProperties(s));
			}

			// Show sector height
			UpdateSectorHeight();

			preventchanges = false; //mxd
		}

		//mxd
		private void MakeUndo() 
		{
			if(undocreated) return;
			undocreated = true;

			//mxd. Make undo
			General.Map.UndoRedo.CreateUndo("Edit " + (sectors.Count > 1 ? sectors.Count + " sectors" : "sector"));
		}

		// This updates the sector height field
		private void UpdateSectorHeight()
		{
			int delta = 0;
			int index = -1; //mxd
			int i = 0; //mxd
			
			// Check all selected sectors
			foreach(Sector s in sectors) 
			{
				if(index == -1) 
				{
					// First sector in list
					delta = s.CeilHeight - s.FloorHeight;
					index = i; //mxd
				} 
				else if(delta != (s.CeilHeight - s.FloorHeight)) 
				{
					// We can't show heights because the delta
					// heights for the sectors is different
					index = -1;
					break;
				}

				i++;
			}

			if(index > -1) 
			{
				int fh = floorheight.GetResult(sectorprops[index].FloorHeight); //mxd
				int ch = ceilingheight.GetResult(sectorprops[index].CeilHeight); //mxd
				int height = ch - fh;
				sectorheight.Text = height.ToString();
				sectorheight.Visible = true;
				sectorheightlabel.Visible = true;
			} 
			else 
			{
				sectorheight.Visible = false;
				sectorheightlabel.Visible = false;
			}
		}

		//mxd
		private void UpdateCeilingHeight() 
		{
			int i = 0;
			int offset;

			if(heightoffset.Text == "++" || heightoffset.Text == "--") // Raise or lower by sector height
			{
				int sign = (heightoffset.Text == "++" ? 1 : -1);
				foreach(Sector s in sectors)
				{
					offset = sectorprops[i].CeilHeight - sectorprops[i].FloorHeight;
					s.CeilHeight += offset * sign;
					i++;
				}
			} 
			else
			{
				// Reset increment steps, otherwise it's just keep counting and counting
				heightoffset.ResetIncrementStep();

				//restore values
				if (string.IsNullOrEmpty(ceilingheight.Text)) 
				{
					foreach (Sector s in sectors)
					{
						// To get the steps for ---/+++ into effect the offset has to be retrieved again for each sector
						offset = heightoffset.GetResult(0);
						s.CeilHeight = sectorprops[i++].CeilHeight + offset;
					}
				} 
				else //update values
				{
					foreach (Sector s in sectors)
					{
						// To get the steps for ---/+++ into effect the offset has to be retrieved again for each sector
						offset = heightoffset.GetResult(0);
						s.CeilHeight = ceilingheight.GetResult(sectorprops[i++].CeilHeight) + offset;
					}
				}
			}
		}

		//mxd
		private void UpdateFloorHeight() 
		{
			int i = 0;
			int offset;

			if(heightoffset.Text == "++" || heightoffset.Text == "--")
			{
				// Raise or lower by sector height
				int sign = (heightoffset.Text == "++" ? 1 : -1);
				foreach(Sector s in sectors)
				{
					offset = sectorprops[i].CeilHeight - sectorprops[i].FloorHeight;
					s.FloorHeight += offset * sign;
					i++;
				}
			}
			else
			{
				// Reset increment steps, otherwise it's just keep counting and counting
				heightoffset.ResetIncrementStep();

				//restore values
				if (string.IsNullOrEmpty(floorheight.Text))
				{
					foreach (Sector s in sectors)
					{
						// To get the steps for ---/+++ into effect the offset has to be retrieved again for each sector
						offset = heightoffset.GetResult(0);
						s.FloorHeight = sectorprops[i++].FloorHeight + offset;
					}
				}
				else //update values
				{
					foreach (Sector s in sectors)
					{
						// To get the steps for ---/+++ into effect the offset has to be retrieved again for each sector
						offset = heightoffset.GetResult(0);
						s.FloorHeight = floorheight.GetResult(sectorprops[i++].FloorHeight) + offset;
					}
				}
			}
		}

		#endregion

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

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

			// Verify the effect
			if((effect.Value < General.Map.FormatInterface.MinEffect) || (effect.Value > General.Map.FormatInterface.MaxEffect)) 
			{
				General.ShowWarningMessage("Sector effect must be between " + General.Map.FormatInterface.MinEffect + " and " + General.Map.FormatInterface.MaxEffect + ".", MessageBoxButtons.OK);
				return;
			}

			MakeUndo(); //mxd

			// Go for all sectors
			int tagoffset = 0; //mxd
			foreach(Sector s in sectors) 
			{
				// Effects
				if(!effect.Empty) s.Effect = effect.Value;

				// Action
				s.Tag = General.Clamp(tagSelector.GetSmartTag(s.Tag, tagoffset++), General.Map.FormatInterface.MinTag, General.Map.FormatInterface.MaxTag); //mxd
			}

			// 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. perform undo
			if (undocreated)
			{
				General.Map.UndoRedo.WithdrawUndo();

				// Changing certain properties of the sector, like floor/ceiling textures will set General.Map.IsChanged to true.
				// But if cancel is pressed and the changes are discarded, and the map was not changed before, we have to force
				// General.Map.IsChanged back to false
				if (General.Map.IsChanged && oldmapischanged == false)
					General.Map.ForceMapIsChangedFalse();
			}
			
			// And be gone
			this.DialogResult = DialogResult.Cancel;
			this.Close();
		}


		// Browse Effect clicked
		private void browseeffect_Click(object sender, EventArgs e)
		{
			effect.Value = EffectBrowserForm.BrowseEffect(this, effect.Value);
		}

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

		#endregion

		#region ================== mxd. Realtime Events

		// Ceiling height changes
		private void ceilingheight_TextChanged(object sender, EventArgs e)
		{
			if(preventchanges) return;
			MakeUndo(); //mxd

			UpdateCeilingHeight();
			UpdateSectorHeight();

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

		// Floor height changes
		private void floorheight_TextChanged(object sender, EventArgs e)
		{
			if(preventchanges) return;
			MakeUndo(); //mxd

			UpdateFloorHeight();
			UpdateSectorHeight();

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

		// Height offset changes
		private void heightoffset_WhenTextChanged(object sender, EventArgs e) 
		{
			if(preventchanges) return;
			MakeUndo(); //mxd

			UpdateFloorHeight();
			UpdateCeilingHeight();
			UpdateSectorHeight();

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

		private void floortex_OnValueChanged(object sender, EventArgs e) 
		{
			if(preventchanges) return;
			MakeUndo(); //mxd

			//restore values
			if(string.IsNullOrEmpty(floortex.TextureName)) 
			{
				int i = 0;
				foreach(Sector s in sectors) s.SetFloorTexture(sectorprops[i++].FloorTexture);
			
			} 
			else //update values
			{
				foreach(Sector s in sectors) s.SetFloorTexture(floortex.GetResult(s.FloorTexture));
			}

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

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

		private void ceilingtex_OnValueChanged(object sender, EventArgs e) 
		{
			if(preventchanges) return;
			MakeUndo(); //mxd

			//restore values
			if(string.IsNullOrEmpty(ceilingtex.TextureName)) 
			{
				int i = 0;
				foreach(Sector s in sectors) s.SetCeilTexture(sectorprops[i++].CeilTexture);
			
			} 
			else //update values
			{
				foreach(Sector s in sectors) s.SetCeilTexture(ceilingtex.GetResult(s.CeilTexture));
			}

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

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

		private void brightness_WhenTextChanged(object sender, EventArgs e) 
		{
			if(preventchanges) return;
			MakeUndo(); //mxd
			int i = 0;

			//restore values
			if(string.IsNullOrEmpty(brightness.Text)) 
			{
				foreach(Sector s in sectors) s.Brightness = sectorprops[i++].Brightness;
			
			} 
			else //update values
			{
				foreach(Sector s in sectors)
					s.Brightness = General.Clamp(brightness.GetResult(sectorprops[i++].Brightness), General.Map.FormatInterface.MinBrightness, General.Map.FormatInterface.MaxBrightness);
			}

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

		#endregion

	}
}