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


namespace FluxEditor
{
	public class FEventEditor : FEditor
	{
		public FTrackEditor TrackEditor { get { return (FTrackEditor)Owner; } }
		public FEvent Evt { get { return (FEvent)Obj; } }

		private int _mouseOffsetFrames;

		protected Rect _eventRect;

		public override FSequenceEditor SequenceEditor { get { return TrackEditor != null ? TrackEditor.SequenceEditor : null; } }

		public override float Height { get { return FTrackEditor.DEFAULT_TRACK_HEIGHT; } }

		public override void Render( Rect rect, float headerWidth )
		{

		}

		// pixelsPerFrame can be calculated from rect and viewRange, but being cached on a higher level
		public void Render( Rect rect, FrameRange viewRange, float pixelsPerFrame, FrameRange validKeyframeRange )
		{
			Rect = rect;

			_eventRect = rect;

			int eventStartFrame = Mathf.Max( Evt.Start, viewRange.Start );
			int eventEndFrame = Mathf.Min( Evt.End, viewRange.End );

//			_eventRect.xMin = Evt.Start * pixelsPerFrame;
//			_eventRect.xMax = Evt.End * pixelsPerFrame;
			_eventRect.xMin = SequenceEditor.GetXForFrame(eventStartFrame);
			_eventRect.xMax = SequenceEditor.GetXForFrame(eventEndFrame);

//			_eventRect.xMin += (eventStartFrame-viewRange.Start) * pixelsPerFrame; // first set the start
//			_eventRect.xMax = _eventRect.xMin + Mathf.Max( 4, (eventEndFrame-eventStartFrame) * pixelsPerFrame ); // then width

			if( _eventRect.Contains( Event.current.mousePosition ) )
				SequenceEditor.SetMouseHover( Event.current.mousePosition.x, this );
			
			RenderEvent( viewRange, validKeyframeRange );
		}

		private int _leftHandleGuiId = 0;
		private int _rightHandleGuiId = 0;

		public override void ReserveGuiIds ()
		{
			base.ReserveGuiIds();
			_leftHandleGuiId = EditorGUIUtility.GetControlID( FocusType.Passive );
			_rightHandleGuiId = EditorGUIUtility.GetControlID( FocusType.Passive );
		}

		protected virtual void RenderEvent( FrameRange viewRange, FrameRange validKeyframeRange )
		{

			bool leftHandleVisible = viewRange.Contains( Evt.Start );
			bool rightHandleVisible = viewRange.Contains( Evt.End );

			Rect leftHandleRect = _eventRect; leftHandleRect.width = 4;
			Rect rightHandleRect = _eventRect; rightHandleRect.xMin = rightHandleRect.xMax - 4;

			if( leftHandleVisible && IsSelected )
				EditorGUIUtility.AddCursorRect( leftHandleRect, MouseCursor.ResizeHorizontal, _leftHandleGuiId );

			if( rightHandleVisible && IsSelected )
				EditorGUIUtility.AddCursorRect( rightHandleRect, MouseCursor.ResizeHorizontal, _rightHandleGuiId );

//			if( SequenceEditor.EditorDragged == this )
//			{
//				Rect editorDraggedRect = _eventRect;
//				editorDraggedRect.y = -Offset.value.y;
//
//				SequenceEditor.EditorDraggedRect = editorDraggedRect;
//
//				SequenceEditor.Repaint();
//			}

			switch( Event.current.type )
			{
			case EventType.Repaint:
				if( !viewRange.Overlaps(Evt.FrameRange) )
				{
					break;
				}

				GUIStyle evtStyle = GetEventStyle();

				GUI.backgroundColor = GetColor ();

				evtStyle.Draw( _eventRect, _isSelected, _isSelected, false, false );

				string text = Evt.Text;
				if( text != null )
					GUI.Label( _eventRect, text, GetTextStyle() );

				break;

			case EventType.MouseDown:
				if( EditorGUIUtility.hotControl == 0 && IsSelected && !Event.current.control && !Event.current.shift )
				{
					Vector2 mousePos = Event.current.mousePosition;

					if( Event.current.button == 0 ) // left click?
					{
						if( rightHandleVisible && rightHandleRect.Contains( mousePos ) )
						{
							EditorGUIUtility.hotControl = _rightHandleGuiId;
	//						keyframeOnSelect = evt.Start;
							Event.current.Use();
						}
						else if( leftHandleVisible && leftHandleRect.Contains( mousePos ) )
						{
							EditorGUIUtility.hotControl = _leftHandleGuiId;
	//						keyframeOnSelect = evt.End;
							Event.current.Use();
						}
						else if( _eventRect.Contains( mousePos ) )
						{
							EditorGUIUtility.hotControl = GuiId;
							_mouseOffsetFrames = SequenceEditor.GetFrameForX( mousePos.x ) - Evt.Start;

							if( IsSelected )
							{
								if( Event.current.control )
								{
									SequenceEditor.Deselect( this );
								}
							}
							else
							{
								if( Event.current.shift )
									SequenceEditor.Select( this );
								else if( !Event.current.control )
									SequenceEditor.SelectExclusive( this );
							}
							Event.current.Use();
						}
					}
					else if( Event.current.button == 1 && _eventRect.Contains(Event.current.mousePosition) ) // right click?
					{
						CreateEventContextMenu().ShowAsContext();
						Event.current.Use();
					}
				}
				break;
				
			case EventType.MouseUp:
				if( EditorGUIUtility.hotControl != 0 )
				{
					if( EditorGUIUtility.hotControl == GuiId
					   || EditorGUIUtility.hotControl == _leftHandleGuiId 
					   || EditorGUIUtility.hotControl == _rightHandleGuiId )
					{
						EditorGUIUtility.hotControl = 0;
						Event.current.Use();
						SequenceEditor.Repaint();
						FinishMovingEventEditors();
					}
				}
				break;
				
			case EventType.MouseDrag:
				if( EditorGUIUtility.hotControl != 0 )
				{
	                if( EditorGUIUtility.hotControl == GuiId )
			    	{

//						if( !TrackEditor.Rect.Contains( Event.current.mousePosition )  )
//						{
//							SequenceEditor.StartDraggingEditor( this );
//						}
//						else
						{
						    int t = SequenceEditor.GetFrameForX( Event.current.mousePosition.x ) - _mouseOffsetFrames;

						    int delta = t-Evt.Start;

							SequenceEditor.MoveEvents( delta );
						}
					    Event.current.Use();

				    }
	                else if( EditorGUIUtility.hotControl == _leftHandleGuiId || EditorGUIUtility.hotControl == _rightHandleGuiId )
	                {
						int leftLimit = 0;
						int rightLimit = 0;

						bool draggingStart = EditorGUIUtility.hotControl == _leftHandleGuiId;

						if( draggingStart )
						{
							leftLimit = validKeyframeRange.Start;
							rightLimit = Evt.End-1;
						}
						else
						{
							leftLimit = Evt.Start+1;
							rightLimit = validKeyframeRange.End;
						}


						int t = SequenceEditor.GetFrameForX( Event.current.mousePosition.x );

						t = Mathf.Clamp( t, leftLimit, rightLimit );

						int delta = t - (draggingStart ? Evt.Start : Evt.End);

						if( draggingStart )
						{
							int newLength = Evt.Length - delta;
							if( newLength < Evt.GetMinLength() )
							{
								delta += newLength - Evt.GetMinLength();
							}
							if( newLength > Evt.GetMaxLength() )
							{
								delta += newLength - Evt.GetMaxLength();
							}
						}
						else
						{
							int newLength = Evt.Length + delta;
							if( newLength < Evt.GetMinLength() )
							{
								delta -= newLength - Evt.GetMinLength();
							}
							if( newLength > Evt.GetMaxLength() )
							{
								delta -= newLength - Evt.GetMaxLength();
							}
						}

						if( delta != 0 )
						{
							if( draggingStart )
								SequenceEditor.ResizeEventsLeft( delta );
							else
								SequenceEditor.ResizeEventsRight( delta );
						}

						Event.current.Use();
					}
				}
				break;

			case EventType.Ignore:
				if( EditorGUIUtility.hotControl == GuiId
				   || EditorGUIUtility.hotControl == _leftHandleGuiId 
				   || EditorGUIUtility.hotControl == _rightHandleGuiId )
				{
					EditorGUIUtility.hotControl = 0;
					SequenceEditor.Repaint();
					FinishMovingEventEditors();
				}
				break;
			}
		}

		public virtual void OnEventMoved( FrameRange oldFrameRange )
		{
			AddEventEditorBeingMoved( this, oldFrameRange );
		}

		public virtual void OnEventFinishedMoving( FrameRange oldFrameRange )
		{

		}

		public virtual Color GetColor()
		{
			return FluxEditor.FUtility.GetEventColor( Evt.GetType().ToString() );
		}

		public virtual GUIStyle GetEventStyle()
		{
			return FUtility.GetEventStyle();
		}

		public virtual GUIStyle GetTextStyle()
		{
			return EditorStyles.label;
		}

		protected virtual GenericMenu CreateEventContextMenu()
		{
			GenericMenu menu = new GenericMenu();

			menu.AddItem(new GUIContent("Copy"), false, Copy);
			menu.AddItem(new GUIContent("Cut"), false, Cut);
			menu.AddItem(new GUIContent("Delete"), false, Delete);

			return menu;
		}

		private void Copy()
		{
			SequenceEditor.CopyEditor( this );
		}

		private void Cut()
		{
			SequenceEditor.CutEditor( this );
		}

		private void Delete()
		{
			List<FEventEditor> eventEditors = new List<FEventEditor>();
			eventEditors.Add( this );
			SequenceEditor.DestroyEvents( eventEditors );
		}

		#region Event editors being moved

		// holds the event editors being moved / resized, so that we can call a function at the end of the move
		// with the full change and not just the delta each update. Useful when you have other assets that have
		// to be changed but you only want to do it at the end (e.g. resize animations, to minimize errors)
		private static Dictionary<FEventEditor, FrameRange> _eventEditorsBeingMoved = new Dictionary<FEventEditor, FrameRange>();
		
		private static void AddEventEditorBeingMoved( FEventEditor evtEditor, FrameRange oldFrameRange )
		{
			if( !_eventEditorsBeingMoved.ContainsKey( evtEditor ) )
			{
				_eventEditorsBeingMoved.Add( evtEditor, oldFrameRange );
			}
		}
		
		public static void FinishMovingEventEditors()
		{
			Dictionary<FEventEditor, FrameRange>.Enumerator e = _eventEditorsBeingMoved.GetEnumerator();
			while( e.MoveNext() )
			{
				e.Current.Key.OnEventFinishedMoving( e.Current.Value );
			}
			_eventEditorsBeingMoved.Clear();
		}

		#endregion
	}
}