using AibisDream.Framework;
using AibisDream.Kit;
using AibisDream.UI;
using TMPro;
using UnityEngine;

namespace AibisDream
{
    public class DialogUIManager : Singleton<DialogUIManager>
    {
        [SerializeField] private LineRunner lineView;
        [SerializeField] private OptionView optionView;
        [SerializeField] private TMP_Text widthEstimation;

        private CanvasGroup _canvasGroup;
        private BubbleSlotGroupData? _pendingBubbleData;
        private bool _isCanvasOpen = true;
        private bool _isDialogVisualVisible = true;

        public override void OnSingletonInit()
        {
            _canvasGroup = GetComponent<CanvasGroup>();
            if (_canvasGroup == null)
            {
                _canvasGroup = gameObject.AddComponent<CanvasGroup>();
            }

            ApplyCanvasGroupState();

            EnumEventSystem.Global.Register<DialogEventEnum, LineInfo>(DialogEventEnum.LineStart, AddDialogueLine);
            EnumEventSystem.Global.Register<DialogEventEnum, LineInfo>(DialogEventEnum.LineHistoryAppend, AddDialogueLine);
            EnumEventSystem.Global.Register<DialogEventEnum, LineInfo>(DialogEventEnum.OptionSelected, AddDialogueLine);
            EnumEventSystem.Global.Register(DialogEventEnum.LineEnd, ApplyPendingBubbleLoad);
            EnumEventSystem.Global.Register(EventEnum.NextYarn, CleanDialogHistory);
            EnumEventSystem.Global.Register(GameLifecycleEvent.SessionEnded, CleanDialogHistory);
            EnumEventSystem.Global.Register(GameLifecycleEvent.SessionEnded, ClearPendingBubbleLoad);
            EnumEventSystem.Global.Register(GameLifecycleEvent.SessionPaused, CloseCanvas);
            EnumEventSystem.Global.Register(GameLifecycleEvent.SessionResumed, OpenCanvas);
        }

        public override void OnSingletonDestroy()
        {
            ClearPendingBubbleLoad();
            EnumEventSystem.Global.UnRegister<DialogEventEnum, LineInfo>(DialogEventEnum.LineStart, AddDialogueLine);
            EnumEventSystem.Global.UnRegister<DialogEventEnum, LineInfo>(DialogEventEnum.LineHistoryAppend, AddDialogueLine);
            EnumEventSystem.Global.UnRegister<DialogEventEnum, LineInfo>(DialogEventEnum.OptionSelected, AddDialogueLine);
            EnumEventSystem.Global.UnRegister(DialogEventEnum.LineEnd, ApplyPendingBubbleLoad);
            EnumEventSystem.Global.UnRegister(EventEnum.NextYarn, CleanDialogHistory);
            EnumEventSystem.Global.UnRegister(GameLifecycleEvent.SessionEnded, CleanDialogHistory);
            EnumEventSystem.Global.UnRegister(GameLifecycleEvent.SessionEnded, ClearPendingBubbleLoad);
            EnumEventSystem.Global.UnRegister(GameLifecycleEvent.SessionPaused, CloseCanvas);
            EnumEventSystem.Global.UnRegister(GameLifecycleEvent.SessionResumed, OpenCanvas);
        }

        private void AddDialogueLine(LineInfo line)
        {
            if (line.character.dialogViewType == DialogViewType.Task)
            {
                return;
            }

            var panel = UIManager.Instance.GetPanel<InGameTerminalPanel>();
            panel?.AppendDialogLine(line);
        }

        private void CleanDialogHistory()
        {
            var panel = UIManager.Instance.GetPanel<InGameTerminalPanel>();
            panel?.ClearDialog();
        }

        public void CloseCanvas()
        {
            _isCanvasOpen = false;
            ApplyCanvasGroupState();
        }

        public void OpenCanvas()
        {
            _isCanvasOpen = true;
            ApplyCanvasGroupState();
        }

        /// <summary>
        /// 仅隐藏对话视觉，不影响打字机、推进与选项交互。
        /// </summary>
        public void SetDialogVisualVisible(bool visible)
        {
            _isDialogVisualVisible = visible;
            ApplyCanvasGroupState();
        }

        private void ApplyCanvasGroupState()
        {
            _canvasGroup.alpha = _isCanvasOpen && _isDialogVisualVisible ? 1f : 0f;

            // SetDialogVisualVisible remains visual-only. Pause-driven canvas state
            // exclusively controls whether dialogue UI can interact or block raycasts.
            _canvasGroup.interactable = _isCanvasOpen;
            _canvasGroup.blocksRaycasts = _isCanvasOpen;
        }

        public void HideDialog()
        {
            lineView.HideDialog();
            optionView.HideDialog();
        }

        public void RegisterScreenView(DialogViewType dialogViewType, ILineView screenView)
        {
            lineView.RegisterView(dialogViewType, screenView);
        }

        public void UnRegisterScreenView(DialogViewType dialogViewType)
        {
            lineView.UnRegisterView(dialogViewType);
        }

        public void LoadBubbles(BubbleSlotGroupData data)
        {
            var token = DialogController.Instance != null
                ? DialogController.Instance.lineSyncToken
                : null;

            if (token != null && token.state != LineSyncState.Advanced)
            {
                // 同一行内的连续请求采用最后一次请求，当前气泡保留到台词推进。
                _pendingBubbleData = data;
                return;
            }

            _pendingBubbleData = null;
            ApplyBubbleLoadImmediately(data);
        }

        private void ApplyPendingBubbleLoad()
        {
            if (!_pendingBubbleData.HasValue)
            {
                return;
            }

            var data = _pendingBubbleData.Value;
            _pendingBubbleData = null;
            ApplyBubbleLoadImmediately(data);
        }

        private void ApplyBubbleLoadImmediately(BubbleSlotGroupData data)
        {
            lineView.LoadBubbleData(data);
            optionView.LoadBubbles(data);
        }

        private void ClearPendingBubbleLoad()
        {
            _pendingBubbleData = null;
        }

        public float EstimateTextWidth(string text, float fontSize)
        {
            widthEstimation.fontSize = fontSize;
            widthEstimation.text = text;
            widthEstimation.ForceMeshUpdate();
            return widthEstimation.preferredWidth;
        }
    }

    public enum DialogViewType
    {
        Default,
        StandardBubble,
        OnelineBox,
        Screen,
        CenterText,
        CenterOption,
        Task,
        Log
    }
}