/*
Copyright (c) 2017, Lars Brubaker, John Lewin
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of the FreeBSD Project.
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using MatterHackers.Agg;
using MatterHackers.Agg.UI;
using MatterHackers.DataConverters3D;
using MatterHackers.Localizations;
using MatterHackers.MatterControl.CustomWidgets;
using MatterHackers.PolygonMesh;

namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
{
	public class SubtractAndReplaceObject3D : MeshWrapperObject3D
	{
		public SubtractAndReplaceObject3D()
		{
			Name = "Subtract and Replace";
		}
	}

	public class SubtractAndReplaceEditor : IObject3DEditor
	{
		private SubtractAndReplaceObject3D group;
		private View3DWidget view3DWidget;
		public string Name => "Subtract & Replace";

		public bool Unlocked { get; } = true;

		public GuiWidget Create(IObject3D group, View3DWidget view3DWidget, ThemeConfig theme)
		{
			this.view3DWidget = view3DWidget;
			this.group = group as SubtractAndReplaceObject3D;

			var mainContainer = new FlowLayoutWidget(FlowDirection.TopToBottom);

			if (group is SubtractAndReplaceObject3D)
			{
				AddPaintSelector(view3DWidget, mainContainer, theme);
			}

			return mainContainer;
		}

		public IEnumerable<Type> SupportedTypes() => new Type[]
		{
			typeof(SubtractAndReplaceObject3D),
		};

		private static FlowLayoutWidget CreateSettingsRow(string labelText)
		{
			var rowContainer = new FlowLayoutWidget(FlowDirection.LeftToRight)
			{
				HAnchor = HAnchor.Stretch,
				Padding = new BorderDouble(5)
			};

			var label = new TextWidget(labelText + ":", textColor: ActiveTheme.Instance.PrimaryTextColor)
			{
				Margin = new BorderDouble(0, 0, 3, 0),
				VAnchor = VAnchor.Center
			};
			rowContainer.AddChild(label);

			rowContainer.AddChild(new HorizontalSpacer());

			return rowContainer;
		}

		private void AddPaintSelector(View3DWidget view3DWidget, FlowLayoutWidget tabContainer, ThemeConfig theme)
		{
			var children = group.Children.ToList();

			tabContainer.AddChild(new TextWidget("Set Replace")
			{
				TextColor = ActiveTheme.Instance.PrimaryTextColor,
				HAnchor = HAnchor.Left,
				AutoExpandBoundsToText = true,
			});

			// create this early so we can use enable disable it on button changed state
			var updateButton = theme.ButtonFactory.Generate("Update".Localize());
			updateButton.Margin = new BorderDouble(5);
			updateButton.HAnchor = HAnchor.Right;
			updateButton.Click += (s, e) =>
			{
				// make sure the mesh on the group is not visible
				group.ResetMeshWrappers();
				updateButton.Enabled = false;
				ProcessBooleans(group);
			};

			List<GuiWidget> radioSiblings = new List<GuiWidget>();
			for (int i = 0; i < children.Count; i++)
			{
				var itemIndex = i;
				var item = children[itemIndex];
				FlowLayoutWidget rowContainer = new FlowLayoutWidget();

				GuiWidget selectWidget;
				if (children.Count == 2)
				{
					var radioButton = new RadioButton(string.IsNullOrWhiteSpace(item.Name) ? $"{itemIndex}" : $"{item.Name}")
					{
						Checked = item.OutputType == PrintOutputTypes.Hole,
						TextColor = ActiveTheme.Instance.PrimaryTextColor
					};
					radioSiblings.Add(radioButton);
					radioButton.SiblingRadioButtonList = radioSiblings;
					selectWidget = radioButton;
				}
				else
				{
					selectWidget = new CheckBox(string.IsNullOrWhiteSpace(item.Name) ? $"{itemIndex}" : $"{item.Name}")
					{
						Checked = item.OutputType == PrintOutputTypes.Hole,
						TextColor = ActiveTheme.Instance.PrimaryTextColor
					};
				}
				rowContainer.AddChild(selectWidget);
				ICheckbox checkBox = selectWidget as ICheckbox;

				checkBox.CheckedStateChanged += (s, e) =>
				{
					// make sure the mesh on the group is not visible
					group.ResetMeshWrappers();

					// and set the output type for this checkbox
					item.OutputType = checkBox.Checked ? PrintOutputTypes.Hole : PrintOutputTypes.Solid;

					int holeCount = children.Where((o) => o.OutputType == PrintOutputTypes.Hole).Count();
					int solidCount = children.Where((o) => o.OutputType != PrintOutputTypes.Hole).Count();
					updateButton.Enabled = children.Count != holeCount && children.Count != solidCount;
				};

				tabContainer.AddChild(rowContainer);
			}

			bool operationApplied = group.DescendantsAndSelf()
				.Where((obj) => obj.OwnerID == group.ID)
				.Where((objId) => objId.Mesh != objId.Children.First().Mesh).Any();

			bool selectionHasBeenMade = group.DescendantsAndSelf()
				.Where((obj) => obj.OwnerID == group.ID && obj.OutputType == PrintOutputTypes.Hole)
				.Any();

			if (!operationApplied && !selectionHasBeenMade)
			{
				// select the last item
				if (tabContainer.Descendants().Where((d) => d is ICheckbox).Last() is ICheckbox lastCheckBox)
				{ 
					lastCheckBox.Checked = true;
				}
			}
			else
			{
				updateButton.Enabled = !operationApplied;
			}

			// add this last so it is at the bottom
			tabContainer.AddChild(updateButton);
		}

		private void ProcessBooleans(IObject3D group)
		{
			// spin up a task to calculate the paint
			ApplicationController.Instance.Tasks.Execute("Subtract".Localize(), (reporter, cancellationToken) =>
			{
				var progressStatus = new ProgressStatus();

				var paintObjects = group.Children
					.Where((i) => i.OutputType == PrintOutputTypes.Hole)
					.SelectMany((h) => h.DescendantsAndSelf())
					.Where((c) => c.OwnerID == group.ID).ToList();
				var keepObjects = group.Children
					.Where((i) => i.OutputType != PrintOutputTypes.Hole)
					.SelectMany((h) => h.DescendantsAndSelf())
					.Where((c) => c.OwnerID == group.ID).ToList();

				if (paintObjects.Any()
					&& keepObjects.Any())
				{
					foreach (var paint in paintObjects)
					{
						var transformedPaint = Mesh.Copy(paint.Mesh, cancellationToken);
						transformedPaint.Transform(paint.WorldMatrix());
						var inverseRemove = paint.WorldMatrix();
						inverseRemove.Invert();
						Mesh paintMesh = null;

						foreach (var keep in keepObjects)
						{
							var transformedKeep = Mesh.Copy(keep.Mesh, cancellationToken);
							transformedKeep.Transform(keep.WorldMatrix());

							// remove the paint from the original
							var intersectAndSubtract = PolygonMesh.Csg.CsgOperations.IntersectAndSubtract(transformedKeep, transformedPaint);
							var inverseKeep = keep.WorldMatrix();
							inverseKeep.Invert();
							intersectAndSubtract.subtract.Transform(inverseKeep);
							keep.Mesh = intersectAndSubtract.subtract;

							// keep all the intersections together
							if(paintMesh == null)
							{
								paintMesh = intersectAndSubtract.intersect;
							}
							else // union into the current paint
							{
								paintMesh = PolygonMesh.Csg.CsgOperations.Union(paintMesh, intersectAndSubtract.intersect);
							}

							if (cancellationToken.IsCancellationRequested)
							{
								break;
							}

							view3DWidget.Invalidate();
						}

						// move the paint mesh back to its original coordinates
						paintMesh.Transform(inverseRemove);

						paint.Mesh = paintMesh;

						paint.Color = paint.WorldColor().AdjustContrast(keepObjects.First().WorldColor(), 2).ToColor();

						// now set it to the new solid color
						paint.OutputType = PrintOutputTypes.Solid;
					}
				}

				// and finally make sure all children are visible
				foreach(var child in group.Children)
				{
					child.OutputType = PrintOutputTypes.Default;
				}

				return Task.CompletedTask;
			});
		}
	}
}