#nullable enable

using System.Collections.Generic;
using System.Threading.Tasks;
using AibisDream.Framework;
using UnityEngine;
using Yarn.Unity;

namespace AibisDream
{
    public class OptionView : DialoguePresenterBase
    {
        private HashSet<string> _selectedIds = new();
        [SerializeField] private DefaultOptions defaultOptions;
        [SerializeField] private CenterOptions centerOptions;
        [SerializeField] private OnelineOptions onelineOptions;
        [SerializeField] private DialogViewType defaultViewType = DialogViewType.StandardBubble;

        public override YarnTask OnDialogueStartedAsync()
        {
            return YarnTask.CompletedTask;
        }

        public override YarnTask OnDialogueCompleteAsync()
        {
            HideDialog();
            return YarnTask.CompletedTask;
        }

        public override YarnTask RunLineAsync(LocalizedLine line, LineCancellationToken token)
        {
            return YarnTask.CompletedTask;
        }

        public void LoadBubbles(BubbleSlotGroupData data)
        {
            defaultViewType = data.dialogViewType;
        }

        public override async YarnTask<DialogueOption?> RunOptionsAsync(DialogueOption[] dialogueOptions, LineCancellationToken cancellationToken)
        {
            EnumEventSystem.Global.Send(DialogEventEnum.OptionShow);
            var optionSelectedSource = new TaskCompletionSource<int>(TaskCreationOptions.RunContinuationsAsynchronously);
            var options = DialogOption.GeneOptions(dialogueOptions, optionId =>
            {
                optionSelectedSource.TrySetResult(optionId);
            }, _selectedIds);

            var viewType = GetCurrentViewType(options);

            switch (viewType)
            {
                case DialogViewType.Default:
                case DialogViewType.StandardBubble:
                    defaultOptions.ShowOptions(options);
                    break;
                case DialogViewType.OnelineBox:
                    onelineOptions.ShowOptions(options);
                    break;
                case DialogViewType.CenterOption:
                    centerOptions.ShowOptions(options);
                    break;
                default:
                    Debug.Log($"选项{options[0].Character.key}没有找到选项框{viewType}");
                    break;
            }

            using var cancellationReg = cancellationToken.NextContentToken.Register(() =>
            {
                optionSelectedSource.TrySetCanceled(cancellationToken.NextContentToken);
            });

            try
            {
                var selectedOptionId = await optionSelectedSource.Task;
                foreach (var dialogueOption in dialogueOptions)
                {
                    if (dialogueOption.DialogueOptionID == selectedOptionId)
                    {
                        return dialogueOption;
                    }
                }

                return null;
            }
            catch (TaskCanceledException)
            {
                return null;
            }
        }

        private DialogViewType GetCurrentViewType(DialogOption[] options)
        {
            var optionViewType = options[0].Character.dialogViewType;

            if (optionViewType == DialogViewType.Default)
            {
                return defaultViewType;
            }

            return optionViewType;
        }

        // --------------------------- 生命周期方法 ---------------------------

        private void OnEnable()
        {
            RegisterEvent();
        }

        private void OnDisable()
        {
            UnRegisterEvent();
        }

        private void RegisterEvent()
        {
            // 进入游戏或者进入下一个Yarn的时候清空
            EnumEventSystem.Global.Register(GameLoopEnum.GameStart, ClearSelectedIds);
            EnumEventSystem.Global.Register(EventEnum.NextYarn, ClearSelectedIds);

            // 选择选项的时候记录
            EnumEventSystem.Global.Register<DialogEventEnum, LineInfo>(DialogEventEnum.OptionSelected, RecordSelectedId);
        }

        private void UnRegisterEvent()
        {
            EnumEventSystem.Global.UnRegister(GameLoopEnum.GameStart, ClearSelectedIds);
            EnumEventSystem.Global.UnRegister(EventEnum.NextYarn, ClearSelectedIds);
            EnumEventSystem.Global.UnRegister<DialogEventEnum, LineInfo>(DialogEventEnum.OptionSelected, RecordSelectedId);
        }

        private void ClearSelectedIds()
        {
            _selectedIds.Clear();
        }

        private void RecordSelectedId(LineInfo lineInfo)
        {
            _selectedIds.Add(lineInfo.lineId);
        }

        public void HideDialog()
        {
            defaultOptions.HideOptions();
            onelineOptions.HideOptions();
            centerOptions.HideOptions();
        }
    }
}