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

namespace BFEditor.Resource
{	
	public static class FrameAnimationTools
	{
	    const float FRAME_TIME = 0.1f;  // 每帧间隔

		struct CheckResult
		{
			public bool legal;
			public GameObject gameObject;
			public Image image;
			public string spritePath;
			public string animationPath;
			public string controllerPath;
		}

	    public static void CreateFrameAnimation(bool parentAni = false)
	    {
	        var result = CheckLegal(parentAni);
	        if (!result.legal)
	        {
	            return;
	        }
	
	        if (!File.Exists(result.animationPath))
	        {
				var bindingPath = parentAni ? result.gameObject.name : "";
	            CreateAnimation(result.spritePath, result.animationPath, bindingPath);
	        }
	        else
	        {
				var bindingPath = parentAni ? result.gameObject.name : "";
				ModifyAnimaiton(result.spritePath, result.animationPath, bindingPath);
	        }
	
	        if (!File.Exists(result.controllerPath))
	        {
				var gameObject = parentAni ? result.gameObject.transform.parent.gameObject : result.gameObject;
	            CreateController(gameObject, result.animationPath, result.controllerPath);
	        }
	        else
	        {
	            Debug.Log(result.controllerPath + "已经存在");
	        }
	
	        AssetDatabase.SaveAssets();
	        AssetDatabase.Refresh();
	    }

	    static CheckResult CheckLegal(bool parentAni = false)
	    {
	        var result = new CheckResult();
	
	        var obj = (GameObject)Selection.activeObject;
	        result.gameObject = obj;
	        if (ReferenceEquals(obj, null))
	        {
	            EditorUtility.DisplayDialog("提示", "当前没有选中的gameObject", "ok");
	            result.legal = false;
	            return result;
	        }

            if (parentAni)
            {
				var parent = obj.transform.parent;
				if (parent == null)
                {
					EditorUtility.DisplayDialog("提示", "当前没有选中的gameObject没有父物体", "ok");
					result.legal = false;
					return result;
				}
            }
	
	        var image = obj.GetComponent<Image>();
	        result.image = image;
	        if (ReferenceEquals(image, null))
	        {
	            EditorUtility.DisplayDialog("提示", "当前选中的gameObject没有image组件", "ok");
	            result.legal = false;
	            return result;
	        }
	
	        var sprite = image.sprite;
	        if (ReferenceEquals(sprite, null))
	        {
	            EditorUtility.DisplayDialog("提示", "image.sprite为空", "ok");
	            result.legal = false;
	            return result;
	        }
	
	        var path = AssetDatabase.GetAssetPath(sprite).Replace("\\", "/");
	        result.spritePath = path;
	        if (string.IsNullOrEmpty(path))
	        {
	            EditorUtility.DisplayDialog("提示", "找不到sprite路径", "ok");
	            result.legal = false;
	            return result;
	        }
	
	        var textureImproter = (TextureImporter)AssetImporter.GetAtPath(path);
	        if (textureImproter.spriteImportMode != SpriteImportMode.Multiple)
	        {
	            EditorUtility.DisplayDialog("提示", "spriteImportMode设置不正确", "ok");
	            result.legal = false;
	            return result;
	        }
	
	        result.animationPath = path.Replace("png", "anim");
	        result.controllerPath = path.Replace("png", "controller");
	        if (File.Exists(result.animationPath))
	        {
	            var tips = string.Format("已经存在{0}\n确定重置序列帧曲线吗?", result.animationPath);
	            if (!EditorUtility.DisplayDialog("提示", tips, "确定", "取消"))
	            {
	                result.legal = false;
	                return result;
	            }
	        }
	
	        result.legal = true;
	        return result;
	    }
	
	    /// <summary>
	    /// 创建animation
	    /// </summary>
	    static void CreateAnimation(string spritePath, string animationPath, string bindingPath = "")
	    {
	        var clip = new AnimationClip();
	        clip.frameRate = 60;
	        var clipSettingss = AnimationUtility.GetAnimationClipSettings(clip);
	        clipSettingss.loopTime = true;
	        AnimationUtility.SetAnimationClipSettings(clip, clipSettingss);
	        var curveBuilding = GetCurveBinding(bindingPath);
	        var keyFrames = GetKeyFrames(spritePath);
	        AnimationUtility.SetObjectReferenceCurve(clip, curveBuilding, keyFrames);
	        AssetDatabase.CreateAsset(clip, animationPath);
	    }
	
	    /// <summary>
	    /// 修改animation
	    /// </summary>
	    static void ModifyAnimaiton(string spritePath, string animationPath, string bindingPath = "")
	    {
	        var keyFrames = GetKeyFrames(spritePath);
	        var clip = AssetDatabase.LoadAssetAtPath<AnimationClip>(animationPath);
	        foreach (var binding in AnimationUtility.GetObjectReferenceCurveBindings(clip))
	        {
                if (binding.path == bindingPath && binding.propertyName == "m_Sprite")
                {
                    AnimationUtility.SetObjectReferenceCurve(clip, binding, keyFrames);
                    Debug.Log("重置序列帧曲线");
                    return;
                }
            }

            var curveBuilding = GetCurveBinding(bindingPath);
            AnimationUtility.SetObjectReferenceCurve(clip, curveBuilding, keyFrames);
        }
	
	    static ObjectReferenceKeyframe[] GetKeyFrames(string spritePath)
	    {
	        // 获取切割出来的sprite
	        var spriteList = new List<Sprite>();
	        var objs = AssetDatabase.LoadAllAssetsAtPath(spritePath);
	        foreach (var obj in objs)
	        {
	            if (obj is Sprite)
	            {
	                spriteList.Add(obj as Sprite);
	            }
	        }
	
	        // 创建序列帧曲线
	        var keyFrames = new ObjectReferenceKeyframe[spriteList.Count];
	        for (int i = 0; i < spriteList.Count; i++)
	        {
	            var keyFrame = new ObjectReferenceKeyframe();
	            keyFrame.time = FRAME_TIME * i;
	            keyFrame.value = spriteList[i];
	            keyFrames[i] = keyFrame;
	        }
	        return keyFrames;
	    }
	
	    static EditorCurveBinding GetCurveBinding(string bindingPath = "")
	    {
	        var curveBuilding = new EditorCurveBinding();
	        curveBuilding.path = bindingPath;
	        curveBuilding.propertyName = "m_Sprite";
	        curveBuilding.type = typeof(Image);
	        return curveBuilding;
	    }
	
	    /// <summary>
	    /// 创建controller
	    /// </summary>
	    static void CreateController(GameObject gameObject, string animationPath, string controllerPath)
	    {
	        var animator = gameObject.GetComponent<Animator>();
	        if (animator == null)
	        {
	            animator = gameObject.AddComponent<Animator>();
	        }
	
	        var controller = UnityEditor.Animations.AnimatorController.CreateAnimatorControllerAtPath(controllerPath);
	        var layer = controller.layers[0];
	        var machine = layer.stateMachine;
	        var stateName = Path.GetFileNameWithoutExtension(animationPath);
	        var animState = machine.AddState(stateName);
	        var clip = AssetDatabase.LoadAssetAtPath<AnimationClip>(animationPath);
	        animState.motion = clip;
	        machine.AddAnyStateTransition(animState);
	        machine.defaultState = animState;
	        animator.runtimeAnimatorController = AssetDatabase.LoadAssetAtPath<RuntimeAnimatorController>(controllerPath);
	    }
	}
}