using System;
using System.Collections;
using System.Collections.Generic;
using DG.Tweening;
using SLSUtilities.WwiseAssistance;
using UniRx;
using UnityEngine;
using UnityEngine.UI;

namespace Ichni.Menu
{
    public class PlaySongUI : MonoBehaviour
    {
        public Button enterGameButton;
        public List<RectTransform> arrows;

        private void Start()
        {
            enterGameButton.onClick.AddListener(EnterGame);
        }

        /// <summary>
        /// 设置标准 Play 按钮是否允许进入游戏。
        /// 当当前歌曲没有可用难度时由 DifficultySelectionContainer 关闭；歌曲锁定仍沿用原有的独立判断。
        /// </summary>
        public void SetEnterGameAvailable(bool isAvailable)
        {
            enterGameButton.interactable = isAvailable;
        }

        private void EnterGame()
        {
            SongSelectionUIPage songSelectionUIPage = MenuManager.instance.songSelectionUIPage;
            SongSelectionTab selectedTab = songSelectionUIPage.songListController.selectedTab;

            // 即使 Button 的 interactable 状态被错误地恢复，也不能把空难度传给 InformationTransistor。
            if (songSelectionUIPage.selectedSong == null || songSelectionUIPage.selectedDifficulty == null || selectedTab == null)
            {
                return;
            }

            // 不能只读取 Tab 的旧显示状态。解锁 Key 可能刚被剧情授予，或 UI 状态被其它逻辑改写；
            // 标准 Play 与快速点击都会回到 UnlockSaveModule 的同一最终授权判断。
            UnlockSaveModule unlockSaveModule = GameSaveManager.instance?.UnlockSaveModule;
            if (unlockSaveModule == null || !unlockSaveModule.CanEnterSong(
                    ChapterSelectionManager.instance?.currentChapter,
                    songSelectionUIPage.selectedSong))
            {
                return;
            }

            selectedTab.RefreshUnlockState();
            
            if (MenuManager.instance.isEnteringGame)
            {
                return;
            }
            
            MenuManager.instance.isEnteringGame = true;
            
            InformationTransistor.instance.SetInformation(
                ChapterSelectionManager.instance.currentChapter,
                songSelectionUIPage.selectedSong,
                songSelectionUIPage.selectedDifficulty);
            AudioManager.Post(AK.EVENTS.ENTERTOGAME);
            SongSelectionManager.instance.StopPreviewSong();
            
            DOTween.KillAll();

            Sequence arrowSeq = DOTween.Sequence();
            
            foreach (var arrow in arrows)
            {
                arrowSeq.Join(arrow.DOAnchorPosX(-584.5f, 0.2f));
            }
            
            arrowSeq.OnComplete(() =>
            {
                MenuManager.instance.transitionUIPage.FadeIn();
                Observable.Timer(TimeSpan.FromSeconds(0.6f)).Subscribe(_ =>
                {
                    MenuManager.instance.EnterGame();
                });
            });

            arrowSeq.Play();
        }
    }
}