using System;
using System.Collections;
using System.Collections.Generic;
using Ichni.Editor;
using Ichni.RhythmGame;
using SLSUtilities.General;
using TMPro;
using UnityEngine;

namespace Ichni
{
    /// <summary>
    /// 编辑器全局管理器。
    /// 继承自 Singleton<EditorManager>，只持有编辑器基础设施引用：
    /// 子管理器、音频播放器、UI、相机、设置、首选项等。
    /// 游戏/谱面数据由 ProjectContainer 持有；
    /// 此处的属性均为转发属性，保持所有外部调用点零改动。
    /// </summary>
    public class EditorManager : Singleton<EditorManager>
    {
        #region [单例别名] Singleton Alias
        /// <summary>小写别名，兼容现有调用点</summary>
        public new static EditorManager instance => Instance;
        #endregion

        #region [加载状态] Load State
        public bool isLoaded;
        #endregion

        #region [编辑器基础设施管理器] Editor Infrastructure Managers
        public ProjectManager projectManager;
        public AudioManager audioManager;
        public MusicPlayer musicPlayer;
        public EditorUIManager uiManager;
        public EditorSettings editorSettings;
        public OperationManager operationManager;
        public BackgroundController backgroundController;
        public SimpleGridController gridController;
        public CameraManager cameraManager;
        public NoteManager noteManager;
        public TrackManager trackManager;
        public AnimationManager animationManager;
        public Canvas judgeHintCanvas;
        public Canvas inspectorCanvas;
        public Timeline timeline;
        public PanelDrawer panelDrawer;
        #endregion

        #region [编辑器首选项转发属性] Editor Preferences Forwarding Properties
        // 实际字段在 ProjectContainer 中定义，此处为转发属性以保持所有调用点不变
        public NoteBase.NoteJudgeType currentJudgeType
        {
            get => ProjectContainer.instance.currentJudgeType;
            set => ProjectContainer.instance.currentJudgeType = value;
        }
        public bool useClickSelect
        {
            get => ProjectContainer.instance.useClickSelect;
            set => ProjectContainer.instance.useClickSelect = value;
        }
        public bool useNotePrefab
        {
            get => ProjectContainer.instance.useNotePrefab;
            set => ProjectContainer.instance.useNotePrefab = value;
        }
        public bool ExpandWhileClick
        {
            get => ProjectContainer.instance.ExpandWhileClick;
            set => ProjectContainer.instance.ExpandWhileClick = value;
        }
        public bool useQuickMove
        {
            get => ProjectContainer.instance.useQuickMove;
            set => ProjectContainer.instance.useQuickMove = value;
        }
        #endregion

        #region [预制体资产集合] Prefab Asset Collections
        public BasePrefabsCollection basePrefabs;
        public Dictionary<string, CustomPrefabsCollection> customPrefabs;
        public NoteAudioCollection noteAudioCollection;
        #endregion

        #region [ProjectContainer 转发属性] ProjectContainer Forwarding Properties
        // 以下属性保持与原 EditorManager 完全相同的访问路径，
        // 内部转发至 ProjectContainer，无需修改任何调用点。
        public ProjectInformation projectInformation
        {
            get => ProjectContainer.instance.projectInformation;
            set => ProjectContainer.instance.projectInformation = value;
        }
        public SongInformation songInformation
        {
            get => ProjectContainer.instance.songInformation;
            set => ProjectContainer.instance.songInformation = value;
        }
        public BeatmapContainer beatmapContainer
        {
            get => ProjectContainer.instance.beatmapContainer;
            set => ProjectContainer.instance.beatmapContainer = value;
        }
        public CommandScripts commandScripts
        {
            get => ProjectContainer.instance.commandScripts;
            set => ProjectContainer.instance.commandScripts = value;
        }
        public VariablesContainer variablesContainer
        {
            get => ProjectContainer.instance.variablesContainer;
            set => ProjectContainer.instance.variablesContainer = value;
        }
        public BackgroundSetter backgroundSetter
        {
            get => ProjectContainer.instance.backgroundSetter;
            set => ProjectContainer.instance.backgroundSetter = value;
        }
        #endregion

        #region [生命周期] Lifecycle
        protected override void Awake()
        {
            base.Awake(); // Singleton<T>.Initialize(false)
            isLoaded = false;
            projectManager = new ProjectManager();
            operationManager = new OperationManager();

            // 注册时间提供者：让编辑器的所有时间相关逻辑通过 CoreServices.TimeProvider 访问，
            // 不再直接依赖 EditorManager.instance.musicPlayer
            CoreServices.TimeProvider = musicPlayer;

            if (!ES3.FileExists(Application.streamingAssetsPath + "/EditorSettings.es3"))
            {
                editorSettings = new EditorSettings(300, 3, 100, 100, 60);
                EditorSettings.SaveSettings(editorSettings);
                Application.targetFrameRate = editorSettings.frameRate;
            }
            else
            {
                EditorSettings.LoadSettings(ref editorSettings);
                Application.targetFrameRate = editorSettings.frameRate;
            }
        }

        private void Start()
        {
            StartCoroutine(StartFrameRate());
            Debug.Log("EditorManager Start: Initializing UI and Loading Project...");
            // ProjectContainer 自身作为根节点注册到层级视图
            ProjectContainer.instance.elementName = "EditorManager";
            ProjectContainer.instance.elementGuid = Guid.Empty;
            uiManager.hierarchy.GenerateTab(ProjectContainer.instance, null);
            ProjectContainer.instance.connectedTab.deleteButton.gameObject.SetActive(false);

            if (InformationTransistor.instance.isLoadedProject)
            {
                LoadProject(InformationTransistor.instance.loadedProjectName);
                Debug.Log("Loaded");
            }
            else
            {
                projectManager.GenerateEmptyProject(
                    InformationTransistor.instance.projectInfo_BM,
                    InformationTransistor.instance.songInfo_BM);
                projectManager.saveManager.Save();
                musicPlayer.audioSource.clip = songInformation.song;
                Debug.Log("Generated");
            }

            StartCoroutine(beatmapContainer.AfterLoadSet());
            isLoaded = true;
            songInformation.songTime = musicPlayer.audioSource.time - songInformation.offset;
        }

        private void Update()
        {
            if (!isLoaded) return;

            projectManager.autoSaveManager.UpdateAutoSave();

            // 统一调度： Animation → Submodules → Track → Note
            float songTime = CoreServices.TimeProvider.SongTime;
            
            animationManager.ManualTick(songTime);
            
            // 手动执行原本属于 UniRx 的每帧调度，消灭不可控的时序错乱
            for (int i = 0; i < beatmapContainer.gameElementList.Count; i++)
            {
                var element = beatmapContainer.gameElementList[i];
                if (element == null) continue;

                if (element is IHaveTimeDurationSubmodule timeHost && !(element is NoteBase))
                {
                    timeHost.timeDurationSubmodule?.UpdateTimeDuration(songTime);
                }
                
                if (element.gameObject.activeSelf)
                {
                    if (element is IHaveTransformSubmodule transformHost)
                    {
                        transformHost.UpdateTransform();
                    }
                    if (element is IHaveColorSubmodule colorHost)
                    {
                        colorHost.UpdateColor();
                    }
                }
            }

            trackManager.ManualTick(songTime);
            noteManager.ManualTick(songTime);
        }
        #endregion

        #region [FPS 监控] FPS Monitor
        public float CurrentFrameRate;
        public TMP_Text FPStext;
        public TMP_Text UIText;

        private IEnumerator StartFrameRate()
        {
            int frameCount = 0;
            while (true)
            {
                CurrentFrameRate = 1f / Time.deltaTime;
                if (frameCount == 2)
                {
                    frameCount = 0;
                    FPStext.text = string.Format("FPS: {0:N2}", CurrentFrameRate);
                }
                frameCount++;
                yield return null;
            }
        }
        #endregion

        #region [项目加载] Project Loading
        public void LoadProject(string projectName)
        {
            if (!InformationTransistor.instance.isRecovery)
            {
                projectManager.loadManager.Load(projectName);
                Debug.Log("Loaded");
            }
            else
            {
                projectManager.loadManager.LoadExport(projectName);
            }

            musicPlayer.audioSource.clip = songInformation.song;
            beatmapContainer.gameElementList.ForEach(gameElement =>
            {
                gameElement.AfterInitialize();
                gameElement.Refresh();
            });
        }
        #endregion

        #region [退出处理] Application Quit
        private bool isQuit = false;

        [Obsolete]
        public void OnApplicationQuit()
        {
            if (isQuit) return;

            Application.CancelQuit(); // 退出拦截
            GeneralSecondaryWindow QuitWindow =
                Instantiate(instance.basePrefabs.generalSecondaryWindow,
                    instance.uiManager.mainPage.mainCanvas.GetComponent<RectTransform>())
                .GetComponent<GeneralSecondaryWindow>();

            QuitWindow.Initialize("Do You Want To Save?");

            var container = QuitWindow.GenerateContainer("Save confirm");
            var beatmapToolsSettings = container.GenerateSubcontainer(3);
            QuitWindow.GenerateButton(beatmapToolsSettings, "Yes", () => SaveAndQuit());
            QuitWindow.GenerateButton(beatmapToolsSettings, "No", () =>
            {
                isQuit = true;
                Application.Quit();
            });
        }

        async void SaveAndQuit()
        {
            isQuit = true;
            LogWindow.Log("Start Saving...", Color.yellow);
            await projectManager.saveManager.SaveAllCoroutine();
            Application.Quit();
        }
        #endregion
    }
}