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

using Flux;

namespace FluxEditor
{
	[FEditor(typeof(FAnimationTrack))]
	public class FAnimationTrackEditor : FTrackEditor {

		#region Debug tools

		private bool _syncWithAnimationWindow = false;
		private bool SyncWithAnimationWindow { 
			get { return _syncWithAnimationWindow; }
			set {

				if( value )
				{
					SequenceEditor.OnUpdateEvent.AddListener( OnUpdate );
					foreach( FContainerEditor containerEditor in SequenceEditor.Editors )
					{
						List<FTimelineEditor> timelineEditors = containerEditor.Editors;
						foreach( FTimelineEditor timelineEditor in timelineEditors )
						{
							List<FTrackEditor> trackEditors = timelineEditor.Editors;
							foreach( FTrackEditor trackEditor in trackEditors )
							{
								if( trackEditor is FAnimationTrackEditor && ((FAnimationTrackEditor)trackEditor).SyncWithAnimationWindow )
									((FAnimationTrackEditor)trackEditor).SyncWithAnimationWindow = false;
							}
						}
					}

					AnimationWindowProxy.OpenAnimationWindow();
				}
				else
				{
					if( TimelineEditor != null )
						SequenceEditor.OnUpdateEvent.RemoveListener( OnUpdate );

					if( AnimationMode.InAnimationMode() )
						AnimationMode.StopAnimationMode();
				}

				_syncWithAnimationWindow = value;

				if( TimelineEditor != null )
					SequenceEditor.Repaint();
			}
		}

		private bool _showKeyframes = false;
		public bool ShowKeyframes
		{
			get { return _showKeyframes; }
			set { _showKeyframes = value; }
		}
		private bool _showKeyframeTimes = false;
		public bool ShowKeyframeTimes
		{
			get { return _showKeyframeTimes; }
			set { _showKeyframeTimes = value; }
		}


		private bool _showTransformPath = false;
		public bool ShowTransformPath
		{
			get{ return _showTransformPath; }
			set{ _showTransformPath = value; }
		}

		#endregion

		protected override void OnEnable()
		{
			base.OnEnable();

			SceneView.onSceneGUIDelegate += OnSceneGUI;

			// was it syncing anim? hook it up again, because UnityEvent will 
			// lose references on compile
			if( _syncWithAnimationWindow )
			{
				_syncWithAnimationWindow = false;
				//				SyncWithAnimationWindow = true;
			}
		}

		private FEvent _previousEvent = null;

		private void OnUpdate()
		{
			if( !_syncWithAnimationWindow )
				return;

			if( Selection.activeTransform != Track.Owner )
			{
				Selection.activeTransform = Track.Owner;
			}

			if( !AnimationMode.InAnimationMode() )
			{
				AnimationWindowProxy.StartAnimationMode();
			}

			int animWindowFrame = AnimationWindowProxy.GetCurrentFrame();

			FEvent[] evts = new FEvent[2];
			int numEvts = Track.GetEventsAt( SequenceEditor.Sequence.CurrentFrame, evts );

			if( numEvts > 0 )
			{
				if( numEvts == 1 )
				{
					_previousEvent = evts[0];
				}
				else if( numEvts == 2 )
				{
					if( _previousEvent != evts[0] && _previousEvent != evts[1] )
					{
						_previousEvent = evts[1];
					}
				}

				FPlayAnimationEvent animEvt = (FPlayAnimationEvent)_previousEvent;
				if( animEvt.ControlsAnimation )
				{
					int normCurrentFrame = SequenceEditor.Sequence.CurrentFrame - animEvt.Start;
					
					if( AnimationWindowProxy.GetSelectedAnimationClip() != animEvt._animationClip )
					{
						AnimationWindowProxy.SelectAnimationClip( animEvt._animationClip );
						AnimationWindowProxy.SetCurrentFrame( normCurrentFrame, SequenceEditor.Sequence.CurrentTime - animEvt.StartTime );
					}

					if( animWindowFrame > animEvt.Length )
					{
						animWindowFrame = animEvt.Length;
						AnimationWindowProxy.SetCurrentFrame( animWindowFrame, animEvt.LengthTime );
					}

					if( animWindowFrame >= 0 && animWindowFrame != normCurrentFrame )
					{
						SequenceEditor.SetCurrentFrame( animEvt.Start + animWindowFrame );
						SequenceEditor.Repaint();
					}
				}
			}
		}

		protected override void OnDestroy()
		{
			base.OnDestroy();

			SceneView.onSceneGUIDelegate -= OnSceneGUI;

			if( SyncWithAnimationWindow )
				SyncWithAnimationWindow = false;
		}

		public override void Init( FObject obj, FEditor owner )
		{
			base.Init( obj, owner );

			FAnimationTrack animTrack = (FAnimationTrack)Obj;

			if( animTrack.Owner.GetComponent<Animator>() == null )
			{
				Animator animator = animTrack.Owner.gameObject.AddComponent<Animator>();
				Undo.RegisterCreatedObjectUndo( animator, string.Empty );
			}
		}

		public override void OnTrackChanged()
		{
			FAnimationTrackInspector.RebuildStateMachine( (FAnimationTrack)Track );
		}


		public override void Render( Rect rect, float headerWidth )
		{
			//			bool isPreviewing = _track.IsPreviewing;

			base.Render( rect, headerWidth );

			//			if( isPreviewing != _track.IsPreviewing )
			//			{
			//				if( Event.current.alt )
			//					SyncWithAnimationWindow = true;
			//			}

			switch( Event.current.type )
			{
			case EventType.DragUpdated:
				if( rect.Contains(Event.current.mousePosition ) )
				{
					int numAnimationsDragged = FAnimationEventInspector.NumAnimationsDragAndDrop( Track.Sequence.FrameRate );
					int frame = SequenceEditor.GetFrameForX( Event.current.mousePosition.x );

					DragAndDrop.visualMode = numAnimationsDragged > 0 && Track.CanAddAt(frame) ? DragAndDropVisualMode.Copy : DragAndDropVisualMode.Rejected;
					Event.current.Use();
				}
				break;
			case EventType.DragPerform:
				if( rect.Contains(Event.current.mousePosition ) )
				{
					AnimationClip animClip = FAnimationEventInspector.GetAnimationClipDragAndDrop( Track.Sequence.FrameRate );

					if( animClip && Mathf.Approximately(animClip.frameRate, Track.Sequence.FrameRate) )
					{
						int frame = SequenceEditor.GetFrameForX( Event.current.mousePosition.x );
						int maxLength;

						if( Track.CanAddAt( frame, out maxLength ) )
						{
							FPlayAnimationEvent animEvt = FEvent.Create<FPlayAnimationEvent>( new FrameRange( frame, frame + Mathf.Min(maxLength, Mathf.RoundToInt(animClip.length*animClip.frameRate))  ) );
							Track.Add( animEvt );
							FAnimationEventInspector.SetAnimationClip( animEvt, animClip );
							DragAndDrop.AcceptDrag();
						}
					}

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

		public override bool HasTools()
		{
			bool controlsAllAnimations = true;
			foreach( FAnimationEventEditor animEvtEditor in _eventEditors )
			{
				if( !((FPlayAnimationEvent)animEvtEditor.Evt).ControlsAnimation )
				{
					controlsAllAnimations = false;
					break;
				}
			}
			return controlsAllAnimations;
		}

		public override void OnToolsGUI ()
		{
			//			bool canSyncWithAnimationWindow = true;
			//			foreach( FAnimationEventEditor animEvtEditor in _eventEditors )
			//			{
			//				if(! ((FPlayAnimationEvent)animEvtEditor._evt).ControlsAnimation )
			//				{
			//					canSyncWithAnimationWindow = false;
			//					break;
			//				}
			//			}
			//
			//			if( canSyncWithAnimationWindow )
			{
				bool syncWithAnimationWindow = EditorGUILayout.Toggle( "Sync w/ Animation Window", SyncWithAnimationWindow );
				if( syncWithAnimationWindow != SyncWithAnimationWindow )
					SyncWithAnimationWindow = syncWithAnimationWindow;
			}

			bool showTransformPath = EditorGUILayout.Toggle( "Show Transform Path", ShowTransformPath );
			if( showTransformPath != ShowTransformPath )
				ShowTransformPath = showTransformPath;

			if( !ShowTransformPath )
				GUI.enabled = false;

			bool showKeyframes = EditorGUILayout.Toggle( "Show Keyframes", ShowKeyframes );
			if( showKeyframes != ShowKeyframes )
				ShowKeyframes = showKeyframes;

			bool showKeyframeTimes = EditorGUILayout.Toggle( "Show Keyframe Times", ShowKeyframeTimes );
			if( showKeyframeTimes != ShowKeyframeTimes )
				ShowKeyframeTimes = showKeyframeTimes;

			GUI.enabled = true;
		}

		protected override Color GetPreviewIconColor()
		{
			return _syncWithAnimationWindow ? Color.red : base.GetPreviewIconColor();
		}

		void OnSceneGUI( SceneView sceneView )
		{
			if( Track == null )
				return;

			for( int i = 0; i != _eventEditors.Count; ++i )
			{
				FAnimationEventEditor animEvtEditor = (FAnimationEventEditor)_eventEditors[i];
				FPlayAnimationEvent animEvt = (FPlayAnimationEvent)_eventEditors[i].Evt;
				if( animEvt._animationClip != null && Flux.FUtility.IsAnimationEditable(animEvt._animationClip) && ShowTransformPath /*_track.IsPreviewing*/ )
				{
					animEvtEditor.RenderTransformCurves( animEvt.Sequence.FrameRate );
				}
			}

			SceneView.RepaintAll();
		}

		private void RenderTransformPath( TransformCurves transformCurves, float length, float samplingDelta )
		{
			float t = 0; 

			int numberSamples = Mathf.RoundToInt(length/samplingDelta)+1;

			float delta = length / numberSamples;

			Vector3[] pts = new Vector3[numberSamples];

			int index = 0;

			while( index < numberSamples )
			{
				pts[index++] = transformCurves.GetPosition( t );
				t += delta;
			}

			if( index != pts.Length )
				Debug.LogError("Number of samples doesn't match: " + (index+1) + " instead of " + pts.Length);

			Handles.DrawPolyLine( pts );
		}

		private void RenderTransformAnimation( TransformCurves transformCurves, float time )
		{
			Vector3 pos = transformCurves.GetPosition(time);
			Quaternion rot = transformCurves.GetRotation(time);
			Vector3 scale = transformCurves.GetScale(time);

			transformCurves.bone.localScale = scale;
			transformCurves.bone.localRotation = rot;
			transformCurves.bone.localPosition = pos;

            Handles.RectangleHandleCap(0, pos, rot, 0.1f, EventType.MouseDown );
            Handles.RectangleHandleCap(0, pos + rot*Vector3.forward, rot, 0.4f, EventType.MouseDown );
		}

		public override void UpdateEventsEditor (int frame, float time)
		{
			if( Track.RequiresEditorCache && !Track.HasCache && Track.CanCreateCache() )
			{
				OnToggle( true );
			}

			base.UpdateEventsEditor (frame, time);

			if( _syncWithAnimationWindow )
			{
				FEvent[] evts = new FEvent[2];
				int numEvts = Track.GetEventsAt( frame, evts );
				if( numEvts > 0 )
				{
					if( numEvts == 1 )
					{
						_previousEvent = evts[0];
					}
					else if( numEvts == 2 )
					{
						if( _previousEvent != evts[0] && _previousEvent != evts[1] )
						{
							_previousEvent = evts[1];
						}
					}

					FPlayAnimationEvent animEvt = (FPlayAnimationEvent)_previousEvent;
					if( animEvt._animationClip != AnimationWindowProxy.GetSelectedAnimationClip() )
					{
						AnimationWindowProxy.SelectAnimationClip( animEvt._animationClip );
					}

					AnimationWindowProxy.SetCurrentFrame( frame - animEvt.Start, time - animEvt.StartTime );
				}
			}
		}
	}
}