/******************************************************************************
 * Spine Runtimes Software License v2.5
 *
 * Copyright (c) 2013-2018, Esoteric Software
 * All rights reserved.
 *
 * You are granted a perpetual, non-exclusive, non-sublicensable, and
 * non-transferable license to use, install, execute, and perform the Spine
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 * or other intellectual property or proprietary rights notices on or in the
 * Software, including any copy thereof. Redistributions in binary or source
 * form must include this license and terms.
 *
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 *****************************************************************************/

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

namespace Spine.Unity.Modules.AnimationTools {
	public static class AnimationTools {

		#region Filler Timelines
		/// <summary>
		/// Matches the animation timelines across the given set of animations.
		/// This allows unkeyed properties to assume setup pose when animations are naively mixed using Animation.Apply.
		/// </summary>
		/// <param name="animations">An enumerable collection animations whose timelines will be matched.</param>
		/// <param name="skeletonData">The SkeletonData where the animations belong.</param>
		public static void MatchAnimationTimelines (IEnumerable<Spine.Animation> animations, SkeletonData skeletonData) {
			if (animations == null) return;
			if (skeletonData == null) throw new System.ArgumentNullException("skeletonData", "Timelines can't be matched without a SkeletonData source.");

			// Build a reference collection of timelines to match
			// and a collection of dummy timelines that can be used to fill-in missing items.
			var timelineDictionary = new Dictionary<int, Spine.Timeline>();
			foreach (var animation in animations) {
				foreach (var timeline in animation.timelines) {
					if (timeline is EventTimeline) continue;

					int propertyID = timeline.PropertyId;
					if (!timelineDictionary.ContainsKey(propertyID)) {
						timelineDictionary.Add(propertyID, GetFillerTimeline(timeline, skeletonData));
					}
				}
			}
			var idsToMatch = new List<int>(timelineDictionary.Keys);

			// For each animation in the list, check for and add missing timelines.
			var currentAnimationIDs = new HashSet<int>();
			foreach (var animation in animations) {
				currentAnimationIDs.Clear();
				foreach (var timeline in animation.timelines) {
					if (timeline is EventTimeline) continue;
					currentAnimationIDs.Add(timeline.PropertyId);
				}

				var animationTimelines = animation.timelines;
				foreach (int propertyID in idsToMatch) {
					if (!currentAnimationIDs.Contains(propertyID))
						animationTimelines.Add(timelineDictionary[propertyID]);
				}
			}

			// These are locals, but sometimes Unity's GC does weird stuff. So let's clean up.
			timelineDictionary.Clear();
			timelineDictionary = null;
			idsToMatch.Clear();
			idsToMatch = null;
			currentAnimationIDs.Clear();
			currentAnimationIDs = null;
		}

		static Timeline GetFillerTimeline (Timeline timeline, SkeletonData skeletonData) {
			int propertyID = timeline.PropertyId;
			int tt = propertyID >> 24;
			var timelineType = (TimelineType)tt;

			switch (timelineType) {
				// Bone
				case TimelineType.Rotate:
					return GetFillerTimeline((RotateTimeline)timeline, skeletonData);
				case TimelineType.Translate:
					return GetFillerTimeline((TranslateTimeline)timeline, skeletonData);
				case TimelineType.Scale:
					return GetFillerTimeline((ScaleTimeline)timeline, skeletonData);
				case TimelineType.Shear:
					return GetFillerTimeline((ShearTimeline)timeline, skeletonData);

				// Slot
				case TimelineType.Attachment:
					return GetFillerTimeline((AttachmentTimeline)timeline, skeletonData);
				case TimelineType.Color:
					return GetFillerTimeline((ColorTimeline)timeline, skeletonData);
				case TimelineType.TwoColor:
					return GetFillerTimeline((TwoColorTimeline)timeline, skeletonData);
				case TimelineType.Deform:
					return GetFillerTimeline((DeformTimeline)timeline, skeletonData);

				// Skeleton
				case TimelineType.DrawOrder:
					return GetFillerTimeline((DrawOrderTimeline)timeline, skeletonData);

				// IK Constraint
				case TimelineType.IkConstraint:
					return GetFillerTimeline((IkConstraintTimeline)timeline, skeletonData);

				// TransformConstraint
				case TimelineType.TransformConstraint:
					return GetFillerTimeline((TransformConstraintTimeline)timeline, skeletonData);

				// Path Constraint
				case TimelineType.PathConstraintPosition:
					return GetFillerTimeline((PathConstraintPositionTimeline)timeline, skeletonData);
				case TimelineType.PathConstraintSpacing:
					return GetFillerTimeline((PathConstraintSpacingTimeline)timeline, skeletonData);
				case TimelineType.PathConstraintMix:
					return GetFillerTimeline((PathConstraintMixTimeline)timeline, skeletonData);
			}

			return null;
		}

		static RotateTimeline GetFillerTimeline (RotateTimeline timeline, SkeletonData skeletonData) {
			var t = new RotateTimeline(1);
			t.boneIndex = timeline.boneIndex;
			t.SetFrame(0, 0, 0);
			return t;
		}

		static TranslateTimeline GetFillerTimeline (TranslateTimeline timeline, SkeletonData skeletonData) {
			var t = new TranslateTimeline(1);
			t.boneIndex = timeline.boneIndex;
			t.SetFrame(0, 0, 0, 0);
			return t;
		}

		static ScaleTimeline GetFillerTimeline (ScaleTimeline timeline, SkeletonData skeletonData) {
			var t = new ScaleTimeline(1);
			t.boneIndex = timeline.boneIndex;
			t.SetFrame(0, 0, 0, 0);
			return t;
		}

		static ShearTimeline GetFillerTimeline (ShearTimeline timeline, SkeletonData skeletonData) {
			var t = new ShearTimeline(1);
			t.boneIndex = timeline.boneIndex;
			t.SetFrame(0, 0, 0, 0);
			return t;
		}

		static AttachmentTimeline GetFillerTimeline (AttachmentTimeline timeline, SkeletonData skeletonData) {
			var t = new AttachmentTimeline(1);
			t.slotIndex = timeline.slotIndex;
			var slotData = skeletonData.slots.Items[t.slotIndex];
			t.SetFrame(0, 0, slotData.attachmentName);
			return t;
		}

		static ColorTimeline GetFillerTimeline (ColorTimeline timeline, SkeletonData skeletonData) {
			var t = new ColorTimeline(1);
			t.slotIndex = timeline.slotIndex;
			var slotData = skeletonData.slots.Items[t.slotIndex];
			t.SetFrame(0, 0, slotData.r, slotData.g, slotData.b, slotData.a);
			return t;
		}

		static TwoColorTimeline GetFillerTimeline (TwoColorTimeline timeline, SkeletonData skeletonData) {
			var t = new TwoColorTimeline(1);
			t.slotIndex = timeline.slotIndex;
			var slotData = skeletonData.slots.Items[t.slotIndex];
			t.SetFrame(0, 0, slotData.r, slotData.g, slotData.b, slotData.a, slotData.r2, slotData.g2, slotData.b2);
			return t;
		}

		static DeformTimeline GetFillerTimeline (DeformTimeline timeline, SkeletonData skeletonData) {
			var t = new DeformTimeline(1);
			t.slotIndex = timeline.slotIndex;
			t.attachment = timeline.attachment;

			if (t.attachment.IsWeighted()) {
				t.SetFrame(0, 0, new float[t.attachment.vertices.Length]);
			} else {
				t.SetFrame(0, 0, t.attachment.vertices.Clone() as float[]);
			}

			return t;
		}

		static DrawOrderTimeline GetFillerTimeline (DrawOrderTimeline timeline, SkeletonData skeletonData) {
			var t = new DrawOrderTimeline(1);
			t.SetFrame(0, 0, null); // null means use setup pose in DrawOrderTimeline.Apply.
			return t;
		}

		static IkConstraintTimeline GetFillerTimeline (IkConstraintTimeline timeline, SkeletonData skeletonData) {
			var t = new IkConstraintTimeline(1);
			var ikConstraintData = skeletonData.ikConstraints.Items[timeline.ikConstraintIndex];
			t.SetFrame(0, 0, ikConstraintData.mix, ikConstraintData.bendDirection);
			return t;
		}

		static TransformConstraintTimeline GetFillerTimeline (TransformConstraintTimeline timeline, SkeletonData skeletonData) {
			var t = new TransformConstraintTimeline(1);
			var data = skeletonData.transformConstraints.Items[timeline.transformConstraintIndex];
			t.SetFrame(0, 0, data.rotateMix, data.translateMix, data.scaleMix, data.shearMix);
			return t;
		}

		static PathConstraintPositionTimeline GetFillerTimeline (PathConstraintPositionTimeline timeline, SkeletonData skeletonData) {
			var t = new PathConstraintPositionTimeline(1);
			var data = skeletonData.pathConstraints.Items[timeline.pathConstraintIndex];
			t.SetFrame(0, 0, data.position);
			return t;
		}

		static PathConstraintSpacingTimeline GetFillerTimeline (PathConstraintSpacingTimeline timeline, SkeletonData skeletonData) {
			var t = new PathConstraintSpacingTimeline(1);
			var data = skeletonData.pathConstraints.Items[timeline.pathConstraintIndex];
			t.SetFrame(0, 0, data.spacing);
			return t;
		}

		static PathConstraintMixTimeline GetFillerTimeline (PathConstraintMixTimeline timeline, SkeletonData skeletonData) {
			var t = new PathConstraintMixTimeline(1);
			var data = skeletonData.pathConstraints.Items[timeline.pathConstraintIndex];
			t.SetFrame(0, 0, data.rotateMix, data.translateMix);
			return t;
		}
		#endregion
	}
}
