#nullable enable

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

namespace AibisDream
{
    public class OptionView : DialoguePresenterBase
    {
        [SerializeField] private DefaultOptions defaultOptions;
        [SerializeField] private CenterOptions centerOptions;
        [SerializeField] private OnelineOptions onelineOptions;
        [SerializeField] private DialogViewType defaultViewType = DialogViewType.StandardBubble;

        private OptionExploreTracker? _tracker;
        private LineInfo? _pendingOptionPrompt;

        private void Awake()
        {
            _tracker = new OptionExploreTracker();
            _tracker.Bind();
        }

        private void OnDestroy()
        {
            _tracker?.Unbind();
            _tracker = null;
        }

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

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

        public override YarnTask RunLineAsync(LocalizedLine line, LineCancellationToken token)
        {
            if (line.IsOptionPromptLine())
            {
                _pendingOptionPrompt = LineInfo.Generate(line);
            }
            else
            {
                ClearPendingOptionPrompt();
            }

            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 (nodeName, tags) = DialogController.Instance != null
                ? DialogController.Instance.GetCurrentNodeContext()
                : (null, (IReadOnlyList<string>)Array.Empty<string>());

            var options = DialogOption.GeneOptions(
                dialogueOptions,
                _tracker,
                nodeName,
                tags,
                optionId => optionSelectedSource.TrySetResult(optionId));

            var viewType = GetCurrentViewType(options);
            var optionPrompt = _pendingOptionPrompt;
            ClearPendingOptionPrompt();

            switch (viewType)
            {
                case DialogViewType.Default:
                case DialogViewType.StandardBubble:
                    defaultOptions.ShowOptions(options);
                    break;
                case DialogViewType.OnelineBox:
                    onelineOptions.ShowOptions(options, optionPrompt?.lineText);
                    if (optionPrompt.HasValue)
                    {
                        EnumEventSystem.Global.Send(
                            DialogEventEnum.LineHistoryAppend,
                            optionPrompt.Value);
                    }
                    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)
            {
                HideDialog();
                return null;
            }
        }

        private void ClearPendingOptionPrompt()
        {
            _pendingOptionPrompt = null;
        }

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

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

            return optionViewType;
        }

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