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

public class LTCompressor
{

    private const string COMPRESSED_PATH = "Assets/Art/Animations/compressed";
    private const string NEED_COMPRESS_PATH = "Assets/Art/Animations/animator";
    
    private static List<string> _compressedFiles;

    [MenuItem("Tools/资源压缩/压缩所有动画")]
    public static void CompressAll()
    {
        // 确保路径存在
        _InitCompressPath();

        // 加载所有需要的动画
        var realPath = Application.dataPath.Replace("Assets", NEED_COMPRESS_PATH);
        var allFiles = System.IO.Directory.GetFiles(realPath, "*.overrideController", System.IO.SearchOption.TopDirectoryOnly);
        var filterFiles = new List<string>();
        foreach (var fileName in allFiles)
        {
            var onlyFileName = System.IO.Path.GetFileName(fileName);
            var assetPath = NEED_COMPRESS_PATH + "/" + onlyFileName;
            filterFiles.Add(assetPath);
        }

        // 挨个处理
        _compressedFiles = new List<string>();
        foreach (var assetPath in filterFiles)
        {
            var loadController = AssetDatabase.LoadAssetAtPath<AnimatorOverrideController>(assetPath);
            if (loadController == null)
            {
                Debug.LogError("读取文件发生错误:" + assetPath);
                return;
            }
            // 检出
            // VersionControlSystem.Checkout(assetPath);
            _CompressAnim(loadController);
        }

        AssetDatabase.Refresh();
    }

    private static void _InitCompressPath()
    {
        var realPath = Application.dataPath.Replace("Assets", COMPRESSED_PATH);
        if (!System.IO.Directory.Exists(realPath))
        {
            System.IO.Directory.CreateDirectory(realPath);
        }
    }

    private static void _CompressAnim(AnimatorOverrideController overrideController)
    {
        // 读取所有的动画
        var overrideClips = new List<KeyValuePair<AnimationClip, AnimationClip>>();
        overrideController.GetOverrides(overrideClips);
        var newClips = new List<KeyValuePair<AnimationClip, AnimationClip>>();

        // 挨个处理
        for (var i = 0; i < overrideClips.Count; ++i)
        {
            var clipPair = overrideClips[i];
            var srcClip = clipPair.Key;
            var dstClip = clipPair.Value;
            if (srcClip == null && dstClip == null)
            {
                // 双为空才报错
                Debug.LogError("动画为空,请检查:" + overrideController.name);
                continue;
            }

            AnimationClip compressedClip;
            if (dstClip == null)
            {
                compressedClip = _CompressClip(srcClip);
            }
            else
            {
                compressedClip = _CompressClip(dstClip);
            }

            if (compressedClip == null)
            {
                Debug.LogError("压缩动画失败:" + srcClip.name);
            }
            
            var newClip = new KeyValuePair<AnimationClip, AnimationClip>(srcClip, compressedClip);
            newClips.Add(newClip);
        }

        // 重新设置
        overrideController.ApplyOverrides(newClips);
    }

    private static bool _CheckIsAllwaysOne(EditorCurveBinding curveBinding, AnimationClip clip)
    {
        // 检查是否一直为1
        var curve = AnimationUtility.GetEditorCurve(clip, curveBinding);
        var keys = curve.keys;
        var isAllwaysOne = true;
        for (var i = 0; i < keys.Length; ++i)
        {
            var key = keys[i];
            if (Math.Abs(key.value - 1) > 0.01f)
            {
                isAllwaysOne = false;
                break;
            }
        }
        return isAllwaysOne;
    }

    private static AnimationClip _CompressClip(AnimationClip clip)
    {
        var clipName = clip.name;
        var savePath = COMPRESSED_PATH + "/compressed_" + clipName + ".anim";
        
        if (_compressedFiles.Contains(savePath))
        {
            var loadClip = AssetDatabase.LoadAssetAtPath<AnimationClip>(savePath);
            return loadClip;
        }
        _compressedFiles.Add(savePath);
        
        // 如果名字中包含compressed,则不再压缩
        if (clip.name.StartsWith("compressed"))
        {
            return clip;
        }
        // 读取所有的曲线,删除scale曲线
        var curveBindings = AnimationUtility.GetCurveBindings(clip);
        var newCurveBindings = new List<EditorCurveBinding>();
        foreach (var curveBinding in curveBindings)
        {
            // Debug.Log("curveBinding.propertyName:" + curveBinding.propertyName);
            if (curveBinding.propertyName.Contains("m_LocalScale") 
                && _CheckIsAllwaysOne(curveBinding, clip))
            {
                continue;
            }
            newCurveBindings.Add(curveBinding);
        }
        // 截取float精度为4位
        foreach (var curveBinding in newCurveBindings)
        {
            var curve = AnimationUtility.GetEditorCurve(clip, curveBinding);
            var keys = curve.keys;
            for (var i = 0; i < keys.Length; ++i)
            {
                var key = keys[i];
                key.value = Mathf.Round(key.value * 10000) / 10000;
                key.outWeight = Mathf.Round(key.outWeight * 10000) / 10000;
                key.inWeight = Mathf.Round(key.inWeight * 10000) / 10000;
                
                keys[i] = key;
            }
            curve.keys = keys;
            AnimationUtility.SetEditorCurve(clip, curveBinding, curve);
        }
        // 创建新的clip,储存为compressed_原有名称
        var newClip = new AnimationClip();
        foreach (var curveBinding in newCurveBindings)
        {
            var curve = AnimationUtility.GetEditorCurve(clip, curveBinding);
            AnimationUtility.SetEditorCurve(newClip, curveBinding, curve);
        }
        
        AssetDatabase.CreateAsset(newClip, savePath);
        return newClip;
    }

}