using UnityEditor;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

namespace Fungus
{

	[CanEditMultipleObjects]
	[CustomEditor (typeof(View))]
	public class ViewEditor : Editor 
	{
		static Color viewColor = Color.yellow;

		protected SerializedProperty primaryAspectRatioProp;
		protected SerializedProperty secondaryAspectRatioProp;
		protected SerializedProperty viewSizeProp;

		// Draw Views when they're not selected
#if UNITY_5_0
		[DrawGizmo(GizmoType.NotSelected | GizmoType.SelectedOrChild)]
#else
		[DrawGizmo(GizmoType.NotInSelectionHierarchy | GizmoType.InSelectionHierarchy)]
#endif
		static void RenderCustomGizmo(Transform objectTransform, GizmoType gizmoType)
		{
			View view = objectTransform.gameObject.GetComponent<View>();
			if (view != null)
			{
				DrawView(view, false);
			}
		}

		protected virtual Vector2 LookupAspectRatio(int index)
		{
			switch (index)
			{
			default:
			case 1:
				return new Vector2(4, 3);
			case 2:
				return new Vector2(3, 2);
			case 3:
				return new Vector2(16, 10);
			case 4:
				return new Vector2(17, 10);
			case 5:
				return new Vector2(16, 9);
			case 6:
				return new Vector2(2, 1);
			case 7:
				return new Vector2(3, 4);
			case 8:
				return new Vector2(2, 3);
			case 9:
				return new Vector2(10, 16);
			case 10:
				return new Vector2(10, 17);
			case 11:
				return new Vector2(9, 16);
			case 12:
				return new Vector2(1, 2);
			}
		}

		protected virtual void OnEnable()
		{
			primaryAspectRatioProp = serializedObject.FindProperty ("primaryAspectRatio");
			secondaryAspectRatioProp = serializedObject.FindProperty ("secondaryAspectRatio");
			viewSizeProp = serializedObject.FindProperty("viewSize");
		}

		public override void OnInspectorGUI()
		{
			serializedObject.Update();

			EditorGUI.BeginChangeCheck();

			EditorGUILayout.PropertyField(viewSizeProp);

			string[] ratios = { "<None>", "Landscape / 4:3", "Landscape / 3:2", "Landscape / 16:10", "Landscape / 17:10", "Landscape / 16:9", "Landscape / 2:1", "Portrait / 3:4", "Portrait / 2:3", "Portrait / 10:16", "Portrait / 10:17", "Portrait / 9:16", "Portrait / 1:2" };

			EditorGUILayout.PropertyField(primaryAspectRatioProp, new GUIContent("Primary Aspect Ratio", "Width and height values that define the primary aspect ratio (e.g. 4:3)"));
			int primaryIndex = EditorGUILayout.Popup("Select Aspect Ratio", 0, ratios);
			if (primaryIndex > 0)
			{
				primaryAspectRatioProp.vector2Value = LookupAspectRatio(primaryIndex);
			}
			EditorGUILayout.Separator();

			EditorGUILayout.PropertyField(secondaryAspectRatioProp, new GUIContent("Secondary Aspect Ratio", "Width and height values that define the primary aspect ratio (e.g. 4:3)"));
			int secondaryIndex = EditorGUILayout.Popup("Select Aspect Ratio", 0, ratios);
			if (secondaryIndex > 0)
			{
				secondaryAspectRatioProp.vector2Value = LookupAspectRatio(secondaryIndex);
			}
			EditorGUILayout.Separator();

			if (EditorGUI.EndChangeCheck())
			{
				// Avoid divide by zero errors
				if (primaryAspectRatioProp.vector2Value.y == 0)
				{
					primaryAspectRatioProp.vector2Value = new Vector2(primaryAspectRatioProp.vector2Value.x, 1f);
				}
				if (secondaryAspectRatioProp.vector2Value.y == 0)
				{
					secondaryAspectRatioProp.vector2Value = new Vector2(secondaryAspectRatioProp.vector2Value.x, 1f);
				}

				SceneView.RepaintAll();
			}

			serializedObject.ApplyModifiedProperties();
		}
		
		protected virtual void OnSceneGUI () 
		{
			View t = target as View;
			if (t.enabled)
			{
				EditViewBounds();
			}
		}
		
		protected virtual void EditViewBounds()
		{
			View view = target as View;

			DrawView(view, true);

			Vector3 pos = view.transform.position;

			float viewSize = CalculateLocalViewSize(view);

			Vector3[] handles = new Vector3[2];
			handles[0] = view.transform.TransformPoint(new Vector3(0, -viewSize, 0));
			handles[1] = view.transform.TransformPoint(new Vector3(0, viewSize, 0));

			Handles.color = Color.white;

			for (int i = 0; i < 2; ++i)
			{
				Vector3 newPos = Handles.FreeMoveHandle(handles[i],
				                                        Quaternion.identity,
				                                        HandleUtility.GetHandleSize(pos) * 0.1f,
				                                        Vector3.zero,
				                                        Handles.CubeCap);
				if (newPos != handles[i])
				{
					Undo.RecordObject(view, "Set View Size");
					view.viewSize = (newPos - pos).magnitude;
					EditorUtility.SetDirty(view);
					break;
				}
			}
		}

		public static void DrawView(View view, bool drawInterior)
		{	
			float height = CalculateLocalViewSize(view);
			float widthA = height * (view.primaryAspectRatio.x / view.primaryAspectRatio.y);
			float widthB = height * (view.secondaryAspectRatio.x / view.secondaryAspectRatio.y);

			Color transparent = new Color(1,1,1,0f);
			Color fill = viewColor;
			Color outline = viewColor;

			bool highlight = Selection.activeGameObject == view.gameObject;

			Flowchart flowchart = FlowchartWindow.GetFlowchart();
			if (flowchart != null)
			{
				foreach (Command command in flowchart.selectedCommands)
				{
					MoveToView moveToViewCommand = command as MoveToView;
					if (moveToViewCommand != null &&
					    moveToViewCommand.targetView == view)
					{
						highlight = true;
					}
					else
					{
						FadeToView fadeToViewCommand = command as FadeToView;
						if (fadeToViewCommand != null &&
						    fadeToViewCommand.targetView == view)
						{
							highlight = true;
						}
					}
				}
			}

			if (highlight)
			{
				fill = outline = Color.green;
				fill.a = 0.1f;
				outline.a = 1f;
			}
			else
			{
				fill.a = 0.1f;
				outline.a = 0.5f;
			}

			if (drawInterior)
			{
				// Draw left box
				{
					Vector3[] verts = new Vector3[4];
					verts[0] = view.transform.TransformPoint(new Vector3(-widthB, -height, 0));
					verts[1] = view.transform.TransformPoint(new Vector3(-widthB, height, 0));
					verts[2] = view.transform.TransformPoint(new Vector3(-widthA, height, 0));
					verts[3] = view.transform.TransformPoint(new Vector3(-widthA, -height, 0));

					Handles.DrawSolidRectangleWithOutline(verts, fill, transparent);
				}

				// Draw right box
				{
					Vector3[] verts = new Vector3[4];
					verts[0] = view.transform.TransformPoint(new Vector3(widthA, -height, 0));
					verts[1] = view.transform.TransformPoint(new Vector3(widthA, height, 0));
					verts[2] = view.transform.TransformPoint(new Vector3(widthB, height, 0));
					verts[3] = view.transform.TransformPoint(new Vector3(widthB, -height, 0));
					
					Handles.DrawSolidRectangleWithOutline(verts, fill, transparent);
				}

				// Draw inner box
				{
					Vector3[] verts = new Vector3[4];
					verts[0] = view.transform.TransformPoint(new Vector3(-widthA, -height, 0));
					verts[1] = view.transform.TransformPoint(new Vector3(-widthA, height, 0));
					verts[2] = view.transform.TransformPoint(new Vector3(widthA, height, 0));
					verts[3] = view.transform.TransformPoint(new Vector3(widthA, -height, 0));
					
					Handles.DrawSolidRectangleWithOutline(verts, transparent, outline );
				}
			}

			// Draw outer box
			{
				Vector3[] verts = new Vector3[4];
				verts[0] = view.transform.TransformPoint(new Vector3(-widthB, -height, 0));
				verts[1] = view.transform.TransformPoint(new Vector3(-widthB, height, 0));
				verts[2] = view.transform.TransformPoint(new Vector3(widthB, height, 0));
				verts[3] = view.transform.TransformPoint(new Vector3(widthB, -height, 0));
				
				Handles.DrawSolidRectangleWithOutline(verts, transparent, outline );
			}
		}

		// Calculate view size in local coordinates
		// Kinda expensive, but accurate and only called in editor.
		static float CalculateLocalViewSize(View view)
		{
			return view.transform.InverseTransformPoint(view.transform.position + new Vector3(0, view.viewSize, 0)).magnitude;
		}
	}

}