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

public class RootMotionEditor : EditorWindow
{
    static string unitFolder;
    static string unitAnimationDataFolder { get { return unitFolder + "AnimationData/"; } }
    static string unitRootMotionFolder { get { return unitFolder + "RootMotion/"; } }
    static string unitAnimationClipFolder { get { return unitFolder + "AnimationClip/"; } }
    static string unitDataFolder { get { return unitFolder + "UnitData/"; } }


//    static string s_AnimFolder = "Assets/Art/Animations/";
    static string s_Controller = "Assets/Scripts/Unit/RootMotion/controller_rootmotion.controller";
 //   static string s_RootMotionDataFolder = "Assets/Data/RootMotionData/";

    GameObject m_Prefab;
    string m_PrefabName { get { return m_Prefab.name; } }
    GameObject m_Unit;
    Transform m_Transform { get { return m_Unit.transform; } }
    string m_SearchText = "";
    HashSet<string> m_SelectAnimations;
    List<string> m_AnimList = new List<string>();

    Animator m_Animator;
    AnimatorOverrideController m_OverrideController;

    const string kEmptyClipName = "Empty";
    const string kStateName = "Action";

    [MenuItem("Erika/RootMotion/Create")]
    static void OpenTool()
    {
        RootMotionEditor editor = GetWindow<RootMotionEditor>();
    }

    private void OnEnable()
    {
        titleContent = new GUIContent("RootMotion Editor");
        m_SelectAnimations = new HashSet<string>();
    }

    private void OnDisable()
    {
        
    }

    private void OnGUI()
    {
        if (m_SelectAnimations == null) m_SelectAnimations = new HashSet<string>();
        if(m_AnimList == null)
        {
            m_AnimList = new List<string>();
            if (m_Prefab != null)
                CollectAnimations(m_Prefab.name);
        }

        EditorGUILayout.LabelField("Select Unit:");
        GameObject prefab = EditorGUILayout.ObjectField(m_Prefab, typeof(GameObject), false) as GameObject;
        if(prefab != m_Prefab)
        {
            OnSelectPrefab(prefab);
        }
        if(m_Prefab == null)
        {
            EditorGUILayout.HelpBox("选择角色", MessageType.Warning);
        }
        GUI_SelectAnimation();
        GUI_Export();
    }

    private void OnSelectPrefab(GameObject prefab)
    {
        m_Prefab = prefab;
        if(m_Prefab != null)
        {
            string path = AssetDatabase.GetAssetPath(prefab);
            string folder = Path.GetDirectoryName(path).Replace('\\', '/');
            folder = folder.Substring(0, folder.LastIndexOf('/'));
            unitFolder = folder + "/";

            m_Unit = PrefabUtility.InstantiatePrefab(m_Prefab) as GameObject;
            InitializeUnit(m_Unit);
            m_SelectAnimations.Clear();
            CollectAnimations(m_Prefab.name);
        }
        else
        {
            m_SelectAnimations.Clear();
            m_Unit = null;
        }
    }

    void InitializeUnit(GameObject unit)
    {
        if (unit == null)
            return;

        m_Animator = unit.GetComponent<Animator>();
        m_Animator.applyRootMotion = true;

        RuntimeAnimatorController controller = AssetDatabase.LoadAssetAtPath(s_Controller, typeof(RuntimeAnimatorController)) as RuntimeAnimatorController;
        if (controller)
        {
            m_OverrideController = new AnimatorOverrideController(controller);
            m_Animator.runtimeAnimatorController = m_OverrideController;
        }
    }

    void CollectAnimations(string prefabName)
    {
        m_AnimList.Clear();
        string animFolder = unitAnimationClipFolder;
        string[] animfiles = Directory.GetFiles(animFolder/*, "*.anim"*/);
        if (animfiles != null && animfiles.Length > 0)
        {
            for (int i = 0; i < animfiles.Length; ++i)
            {
                string file = animfiles[i];
                if (file.Contains(".meta"))
                    continue;
                string animName = Path.GetFileNameWithoutExtension(file);
                m_AnimList.Add(animName);
            }
        }
    }

    bool IsAllSelected()
    {
        if (m_SelectAnimations == null || m_SelectAnimations.Count == 0)
            return false;
        if (m_AnimList == null || m_AnimList.Count == 0)
            return false;
        return m_AnimList.Count == m_SelectAnimations.Count;
    }

    Vector2 m_AnimtionListScroll;
    private void GUI_SelectAnimation()
    {
        if (m_Prefab == null)
            return;
        EditorGUILayout.LabelField("Select Animations:");
        m_SearchText = GUILayout.TextField(m_SearchText, "SearchTextField", GUILayout.Width(position.width - 20)).ToLower();

        bool isAllSelected = IsAllSelected();
        bool allselcted = GUILayout.Toggle(isAllSelected, "全选");
        if(allselcted && !isAllSelected)
        {
            m_SelectAnimations.Clear();
            m_AnimList.ForEach(s =>m_SelectAnimations.Add(s));
        }
        else if(!allselcted && isAllSelected)
        {
            m_SelectAnimations.Clear();
        }

        if (m_AnimList != null && m_AnimList.Count > 0)
        {
            m_AnimtionListScroll = EditorGUILayout.BeginScrollView(m_AnimtionListScroll, GUILayout.Height(400));

            for (int i = 0; i < m_AnimList.Count; ++i)
            {
                string file = m_AnimList[i];
                if (file.Contains(".meta"))
                    continue;
                string animName = Path.GetFileNameWithoutExtension(file);
                bool show = m_SearchText == string.Empty || m_SearchText == "" || animName.ToLower().Contains(m_SearchText);
                if (!show)
                    continue;
                bool bChecked = m_SelectAnimations.Contains(animName);
                bool check = GUILayout.Toggle(bChecked, animName, GUILayout.Height(15));
                if (check && !bChecked)
                    m_SelectAnimations.Add(animName);
                else if(!check && bChecked)
                    m_SelectAnimations.Remove(animName);
            }

            EditorGUILayout.EndScrollView();
        }
    }

    void GUI_Export()
    {
        EditorGUILayout.Space();
        EditorGUILayout.Space();

        GUI.enabled = m_SelectAnimations != null && m_SelectAnimations.Count > 0;
        if (GUILayout.Button("Export"))
        {
            ExportRootMotions();
        }
        GUI.enabled = true;
    }

    void ExportRootMotions()
    {
        if (m_SelectAnimations == null || m_SelectAnimations.Count == 0)
            return;

        foreach(var animation in m_SelectAnimations)
        {
            ExportRootMotion(animation);
        }

        EditorUtility.DisplayDialog("Export RootMotion", "目录 " + unitRootMotionFolder + m_Prefab.name, "OK");
    }

    void ExportRootMotion(string animation)
    {
        string animPath = unitAnimationClipFolder + animation + ".anim";
        string assetPath = unitRootMotionFolder + animation + ".asset";
        AnimationClip clip = AssetDatabase.LoadAssetAtPath<AnimationClip>(animPath);
        if(clip == null)
        {
            Debug.LogError("[RootMotion Editor] 没有对应的animation, " + animPath);
            return;
        }
        m_OverrideController[kEmptyClipName] = clip;

        m_Transform.position = Vector3.zero;
        m_Transform.rotation = Quaternion.identity;

        float frameRate = clip.frameRate;
        float timeLen = clip.length;

        float sampleRate = 30; // rootmotion 采样频率，每秒采样30帧
        float sampleDuration = 1 / sampleRate;

        RootMotionData rootmotion = new RootMotionData();
        rootmotion.animationName = animation;
        rootmotion.animationLength = timeLen;
        rootmotion.fps = sampleRate;

        rootmotion.positionList = new List<Vector3>();
        rootmotion.positionList.Add(Vector3.zero);

        const float kDeltaTime = 1 / 100f;
        float t = 0;
        float sampleTime = 0;

        while(true)
        {
            m_Animator.speed = 1; 
            m_Animator.Play(kStateName, 0, t / timeLen);
            m_Animator.Update(kDeltaTime);
            m_Animator.speed = 0;

            sampleTime += kDeltaTime;
            if(sampleTime >= sampleDuration)
            {
                Vector3 pos = m_Transform.position;
                pos.x = 0;
                //pos.y = pos.y < 0 ? 0 : pos.y;

                rootmotion.positionList.Add(pos);
                sampleTime = sampleTime - sampleDuration; 
            }

            if (t == timeLen)
                break;
            t += kDeltaTime;
            if (t > timeLen)
                t = timeLen;
        }

        rootmotion.frameCount = rootmotion.positionList.Count;

        AssetDatabase.CreateAsset((RootMotionData)rootmotion, assetPath);
    }
     
}