/******************************************************************************
 * Spine Runtimes Software License v2.5
 *
 * Copyright (c) 2013-2016, 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
 * Runtimes software and derivative works solely for personal or internal
 * use. Without the written permission of Esoteric Software (see Section 2 of
 * the Spine Software License Agreement), you may not (a) modify, translate,
 * adapt, or develop new applications using the Spine Runtimes or otherwise
 * create derivative works or improvements of the Spine Runtimes or (b) remove,
 * delete, alter, or obscure any trademarks or any copyright, trademark, patent,
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "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 ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS INTERRUPTION, OR LOSS OF
 * USE, DATA, OR PROFITS) 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.
 *****************************************************************************/

using UnityEditor;
using UnityEngine;

namespace Spine.Unity.Editor {	
	[CustomEditor(typeof(BoneFollower)), CanEditMultipleObjects]
	public class BoneFollowerInspector : UnityEditor.Editor {
		SerializedProperty boneName, skeletonRenderer, followZPosition, followBoneRotation, followLocalScale, followSkeletonFlip;
		BoneFollower targetBoneFollower;
		bool needsReset;

		#region Context Menu Item
		[MenuItem ("CONTEXT/SkeletonRenderer/Add BoneFollower GameObject")]
		static void AddBoneFollowerGameObject (MenuCommand cmd) {
			var skeletonRenderer = cmd.context as SkeletonRenderer;
			var go = new GameObject("BoneFollower");
			var t = go.transform;
			t.SetParent(skeletonRenderer.transform);
			t.localPosition = Vector3.zero;

			var f = go.AddComponent<BoneFollower>();
			f.skeletonRenderer = skeletonRenderer;

			EditorGUIUtility.PingObject(t);

			Undo.RegisterCreatedObjectUndo(go, "Add BoneFollower");
		}

		// Validate
		[MenuItem ("CONTEXT/SkeletonRenderer/Add BoneFollower GameObject", true)]
		static bool ValidateAddBoneFollowerGameObject (MenuCommand cmd) {
			var skeletonRenderer = cmd.context as SkeletonRenderer;
			return skeletonRenderer.valid;
		}
		#endregion

		void OnEnable () {
			skeletonRenderer = serializedObject.FindProperty("skeletonRenderer");
			boneName = serializedObject.FindProperty("boneName");
			followBoneRotation = serializedObject.FindProperty("followBoneRotation");
			followZPosition = serializedObject.FindProperty("followZPosition");
			followLocalScale = serializedObject.FindProperty("followLocalScale");
			followSkeletonFlip = serializedObject.FindProperty("followSkeletonFlip");

			targetBoneFollower = (BoneFollower)target;
			if (targetBoneFollower.SkeletonRenderer != null)
				targetBoneFollower.SkeletonRenderer.Initialize(false);
		}

		public void OnSceneGUI () {
			var tbf = target as BoneFollower;
			var skeletonRendererComponent = tbf.skeletonRenderer;
			if (skeletonRendererComponent == null) return;

			var transform = skeletonRendererComponent.transform;
			var skeleton = skeletonRendererComponent.skeleton;

			if (string.IsNullOrEmpty(tbf.boneName)) {
				SpineHandles.DrawBones(transform, skeleton);
				SpineHandles.DrawBoneNames(transform, skeleton);
				Handles.Label(tbf.transform.position, "No bone selected", EditorStyles.helpBox);
			} else {
				var targetBone = tbf.bone;
				if (targetBone == null) return;
				SpineHandles.DrawBoneWireframe(transform, targetBone, SpineHandles.TransformContraintColor);
				Handles.Label(targetBone.GetWorldPosition(transform), targetBone.Data.Name, SpineHandles.BoneNameStyle);
			}
		}

		override public void OnInspectorGUI () {
			if (serializedObject.isEditingMultipleObjects) {
				if (needsReset) {
					needsReset = false;
					foreach (var o in targets) {
						var bf = (BoneFollower)o;
						bf.Initialize();
						bf.LateUpdate();
					}
					SceneView.RepaintAll();
				}

				EditorGUI.BeginChangeCheck();
				DrawDefaultInspector();
				needsReset |= EditorGUI.EndChangeCheck();
				return;
			}

			if (needsReset) {
				targetBoneFollower.Initialize();
				targetBoneFollower.LateUpdate();
				needsReset = false;
				SceneView.RepaintAll();
			}
			serializedObject.Update();

			// Find Renderer
			if (skeletonRenderer.objectReferenceValue == null) {
				SkeletonRenderer parentRenderer = targetBoneFollower.GetComponentInParent<SkeletonRenderer>();
				if (parentRenderer != null && parentRenderer.gameObject != targetBoneFollower.gameObject) {
					skeletonRenderer.objectReferenceValue = parentRenderer;
					Debug.Log("Inspector automatically assigned BoneFollower.SkeletonRenderer");
				}
			}

			EditorGUILayout.PropertyField(skeletonRenderer);
			var skeletonRendererReference = skeletonRenderer.objectReferenceValue as SkeletonRenderer;
			if (skeletonRendererReference != null) {
				if (skeletonRendererReference.gameObject == targetBoneFollower.gameObject) {
					skeletonRenderer.objectReferenceValue = null;
					EditorUtility.DisplayDialog("Invalid assignment.", "BoneFollower can only follow a skeleton on a separate GameObject.\n\nCreate a new GameObject for your BoneFollower, or choose a SkeletonRenderer from a different GameObject.", "Ok");
				}
			}

			if (targetBoneFollower.valid) {
				EditorGUI.BeginChangeCheck();
				EditorGUILayout.PropertyField(boneName);
				if (EditorGUI.EndChangeCheck()) {
					serializedObject.ApplyModifiedProperties();
					needsReset = true;
					serializedObject.Update();
				}
				EditorGUILayout.PropertyField(followBoneRotation);
				EditorGUILayout.PropertyField(followZPosition);
				EditorGUILayout.PropertyField(followLocalScale);
				EditorGUILayout.PropertyField(followSkeletonFlip);
			} else {
				var boneFollowerSkeletonRenderer = targetBoneFollower.skeletonRenderer;
				if (boneFollowerSkeletonRenderer == null) {
					EditorGUILayout.HelpBox("SkeletonRenderer is unassigned. Please assign a SkeletonRenderer (SkeletonAnimation or SkeletonAnimator).", MessageType.Warning);
				} else {
					boneFollowerSkeletonRenderer.Initialize(false);

					if (boneFollowerSkeletonRenderer.skeletonDataAsset == null)
						EditorGUILayout.HelpBox("Assigned SkeletonRenderer does not have SkeletonData assigned to it.", MessageType.Warning);

					if (!boneFollowerSkeletonRenderer.valid)
						EditorGUILayout.HelpBox("Assigned SkeletonRenderer is invalid. Check target SkeletonRenderer, its SkeletonDataAsset or the console for other errors.", MessageType.Warning);
				}
			}

			var current = UnityEngine.Event.current;
			bool wasUndo = (current.type == EventType.ValidateCommand && current.commandName == "UndoRedoPerformed");
			if (serializedObject.ApplyModifiedProperties() || wasUndo)
				targetBoneFollower.Initialize();
		}
	}

}