using AibisDream.Framework;
using AibisDream.Kit;
using AibisDream.SaveSystem;
using UnityEngine;
using System.Collections;
using DG.Tweening;

namespace AibisDream.FixSystem
{
    public enum SystemStartupMode
    {
        AutoOnHead,
        Deferred
    }

    /// <summary>
    /// 维修面板系统 - 统一管理所有侧边栏面板
    /// 包括常驻面板（对话、任务）和随状态切换的游戏面板
    /// </summary>
    public class FixPanelSystem : Singleton<FixPanelSystem>
    {
        private void Start()
        {
            InitLight();
        }

        private void OnEnable()
        {
            RegisterCanvasCamera();
            RegisterPanels();
            RegisterScreenView();
        }

        private void OnDisable()
        {
            UnRegisterCanvasCamera();
            _panelContainer.Clear();
            UnRegisterScreenView();
        }

        #region 维修面板

        private static IOCContainer _panelContainer = new();

        public static T GetRepairPanel<T>() where T : class
        {
            return _panelContainer.Get<T>();
        }

        public void RegisterPanels()
        {
            var panels = GetComponentsInChildren<IOperatorPanel>(true);
            foreach (var panel in panels)
            {
                _panelContainer.RegisterByInstance(panel);
            }
        }

        #endregion

        #region 维修管理扩展

        [Header("光照系统")]
        [SerializeField] private bool isSystemOn = false;
        public bool IsSystemOn => isSystemOn;
        public bool ShouldAutoStartOnHeadEntry =>
            !isSystemOn && (!isStartupPrepared || startupMode == SystemStartupMode.AutoOnHead);

        [SerializeField] private FixPanelLight panelLight;
        public FixPanelLight PanelLight => panelLight;

        private bool isStarting;
        private bool isStartupPrepared;
        private SystemStartupMode startupMode = SystemStartupMode.AutoOnHead;
        private LightState targetLightState = LightState.Normal;

        [Header("维修切换管理")]
        [SerializeField] private RepairSystemManager repairSystemManager;
        public RepairSystemManager RepairSystemManager => repairSystemManager;

        private void InitLight()
        {
            panelLight.Initialize(isSystemOn, targetLightState);
            GetRepairPanel<CablePanel>().InitLight(isSystemOn);
            // 无光环境下屏幕也不能亮
            if (!isSystemOn)
            {
                screenPanel.gameObject.SetActive(false);
            }
        }

        #endregion

        #region 系统启动协调

        /// <summary>
        /// 为指定剧情准备一次系统启动。只有显式调用该接口的 YarnProject 会改变默认表现。
        /// </summary>
        public void PrepareSystemStartup(SystemStartupMode mode)
        {
            startupMode = mode;
            isStartupPrepared = true;
            targetLightState = LightState.Normal;
            ApplySystemOnImmediate(false);
            taskPanel?.SetVisible(false, immediate: true);
        }

        /// <summary>
        /// 启动所有系统（协调灯光系统和 CablePanel 的启动顺序）
        /// </summary>
        public IEnumerator StartAllSystems()
        {
            if (isSystemOn) yield break;

            if (isStarting)
            {
                while (isStarting)
                {
                    yield return null;
                }
                yield break;
            }

            isStarting = true;

            // 1. 先启动 CablePanel 的系统自检
            var cablePanel = GetRepairPanel<CablePanel>();
            if (cablePanel != null)
            {
                yield return cablePanel.StartSystem();
            }

            // 2. 再启动灯光序列
            if (panelLight != null)
            {
                yield return panelLight.PanelLightStartSequence();
            }

            // 3. 再启动屏幕面板
            screenPanel.gameObject.SetActive(true);

            isSystemOn = true;
            isStarting = false;
            isStartupPrepared = false;

            // 开机动画使用 Normal 表现，完成后再进入 Yarn 在关机期间缓存的目标状态。
            ApplyLightState(targetLightState);
        }

        /// <summary>
        /// 设置灯光状态，并同步更新相关面板的灯光效果
        /// </summary>
        public void SetLightState(LightState newState)
        {
            targetLightState = newState;

            // 关机时只缓存目标状态，避免序章的 Warning 提前点亮面板。
            if (!isSystemOn) return;

            ApplyLightState(newState);
        }

        private void ApplyLightState(LightState newState)
        {
            // 1. 更新主灯光系统
            if (panelLight != null)
            {
                panelLight.SetLightState(newState);
            }

            // 2. 同步更新 CablePanel 的灯光效果
            var cablePanel = GetRepairPanel<CablePanel>();
            if (cablePanel != null)
            {
                cablePanel.UpdateBreathingLight(newState);
                cablePanel.UpdateECGWave(newState);
            }
        }

        #endregion

        #region 快照 Capture / Restore

        public FixPanelSnapshotDto CapturePanelSnapshot()
        {
            var cablePanel = GetRepairPanel<CablePanel>();
            var dto = new FixPanelSnapshotDto
            {
                isSystemOn = isSystemOn,
                lightState = targetLightState.ToString(),
                currentRepairSystemType = repairSystemManager?.GetCurrentSystemType()?.Name,
                isCableRetracted = cablePanel != null && cablePanel.isCableRetracted
            };

            if (cablePanel != null && cablePanel.TryGetPluggedModuleName(out var moduleName))
            {
                dto.pluggedModuleName = moduleName;
            }

            if (dto.isCableRetracted && !string.IsNullOrEmpty(dto.pluggedModuleName))
            {
                Debug.LogWarning("[FixPanelSystem] Capture: isCableRetracted 与 pluggedModuleName 冲突，忽略 pluggedModuleName。");
                dto.pluggedModuleName = null;
            }

            if (taskPanel != null)
            {
                taskPanel.CaptureSnapshot(out dto.isTaskPanelRequestedVisible, dto.tasks);
            }

            return dto;
        }

        public void ApplyPanelSnapshot(FixPanelSnapshotDto dto)
        {
            if (dto == null) return;

            // 读档恢复的是稳定终态，不继承可能仍留在场景中的待启动模式。
            isStartupPrepared = false;
            startupMode = SystemStartupMode.AutoOnHead;
            targetLightState = LightState.Normal;
            if (!string.IsNullOrEmpty(dto.lightState)
                && !System.Enum.TryParse(dto.lightState, true, out targetLightState))
            {
                Debug.LogWarning($"[FixPanelSystem] Unknown saved light state '{dto.lightState}'; using Normal.");
                targetLightState = LightState.Normal;
            }

            ApplySystemOnImmediate(dto.isSystemOn);

            if (repairSystemManager != null)
            {
                repairSystemManager.RestoreSystemType(dto.currentRepairSystemType);
            }

            GetRepairPanel<CablePanel>()?.ApplyCableSnapshot(dto.isCableRetracted, dto.pluggedModuleName);

            taskPanel?.ApplySnapshot(dto.isTaskPanelRequestedVisible, dto.tasks);
        }

        /// <summary>读档终态：跳过 StartAllSystems 动画，直接写面板壳层状态。</summary>
        public void ApplySystemOnImmediate(bool isOn)
        {
            isSystemOn = isOn;
            isStarting = false;

            if (panelLight != null)
            {
                panelLight.Initialize(isOn, targetLightState);
            }

            var cablePanel = GetRepairPanel<CablePanel>();
            cablePanel?.InitLight(isOn);

            if (screenPanel != null)
            {
                screenPanel.gameObject.SetActive(isOn);
            }
        }

        #endregion

        #region 屏幕相关操作
        [Header("默认画布")]
        [SerializeField] private Canvas canvas;

        [Header("全景遮罩")]
        [SerializeField] private SpriteRenderer mask;

        [Header("任务面板")]
        [SerializeField] private TaskPanel taskPanel;
        public TaskPanel TaskPanel => taskPanel;

        [Header("屏幕面板")]
        [SerializeField] private ScreenPanel screenPanel;
        public ScreenPanel ScreenPanel => screenPanel;

        private void RegisterScreenView()
        {
            DialogUIManager.Instance.RegisterScreenView(DialogViewType.Screen, screenPanel);
            DialogUIManager.Instance.RegisterScreenView(DialogViewType.Task, taskPanel);
        }

        private void UnRegisterScreenView()
        {
            DialogUIManager.Instance.UnRegisterScreenView(DialogViewType.Screen);
            DialogUIManager.Instance.UnRegisterScreenView(DialogViewType.Task);
        }

        private void RegisterCanvasCamera()
        {
            canvas.worldCamera = Camera.main;
        }

        private void UnRegisterCanvasCamera()
        {
            canvas.worldCamera = null;
        }

        /// <summary>
        /// 遮罩淡入（从当前透明度过渡到不透明）
        /// </summary>
        /// <param name="duration">淡入时长（秒）</param>
        public IEnumerator MaskFadeIn(float duration = 1f)
        {
            if (mask == null) yield break;
            yield return mask.DOFade(1f, duration).WaitForCompletion();
        }

        /// <summary>
        /// 遮罩淡出（从当前透明度过渡到透明）
        /// </summary>
        /// <param name="duration">淡出时长（秒）</param>
        public IEnumerator MaskFadeOut(float duration = 1f)
        {
            if (mask == null) yield break;
            yield return mask.DOFade(0f, duration).WaitForCompletion();
        }

        #endregion
    }
}