using System;
using System.Collections;
using System.Collections.Generic;
using DG.Tweening;
using Sirenix.OdinInspector;
using SLSUtilities.WwiseAssistance;
using TMPro;
using UniRx;
using UnityEngine;
using UnityEngine.Serialization;
using UnityEngine.UI;

namespace Ichni.Menu
{
    public partial class SongSelectionTab : MonoBehaviour
    {
        private SongListControllerUI songListController => MenuManager.instance.songSelectionUIPage.songListController;

        /// <summary>
        /// 供锁标识和预览滤镜使用的运行时状态。进入歌曲前必须调用 <see cref="RefreshUnlockState"/>
        /// 重新计算，不能把缓存的显示状态当作最终授权结果。
        /// </summary>
        public bool isLocked;
        
        public SongItemData connectedSong;
        public TMP_Text songNameText;
        public TMP_Text composerNameText;
        
        public Button quickSwitchButton;

        public float distanceToCenter;
        
        [Title("背景图&选中处理")]
        public RectTransform background;
        public Image selectedImage;
        public Image unselectedImage;
        public Image lockMark;
        
        public void SetUpTab(SongItemData song)
        {
            connectedSong = song;
            songNameText.text = song.displaySongName;
            composerNameText.text = song.composer;

            RefreshUnlockState();
            
            quickSwitchButton.onClick.AddListener(() =>
            {
                if (MenuManager.instance.songSelectionUIPage.songListController.selectedTab == this)
                {
                    SongSelectionUIPage songSelectionUIPage = MenuManager.instance.songSelectionUIPage;

                    // 快速进入会绕过 PlaySongUI 的 Button.interactable，必须在此处重复保护空难度状态。
                    if (songSelectionUIPage.selectedSong == null || songSelectionUIPage.selectedDifficulty == null)
                    {
                        return;
                    }

                    // 快速进入与标准 Play 共用统一的章节 + 歌曲授权检查，不能因 UI 状态过期而绕过锁定。
                    if (!RefreshUnlockState())
                    {
                        return;
                    }

                    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();
                    
                    MenuManager.instance.transitionUIPage.FadeIn();
                    
                    Observable.Timer(TimeSpan.FromSeconds(0.6f)).Subscribe(_ =>
                    {
                        MenuManager.instance.EnterGame();
                    });
                }
                else
                {
                    StartCoroutine(MenuManager.instance.songSelectionUIPage.songListController.SnapToTab(this));
                }
            });
        }

        /// <summary>
        /// 重新计算当前 Tab 是否锁定，并同步锁图标。
        /// 章节本身被锁定时，即使歌曲规则无条件开放，也仍然视为不可进入。
        /// </summary>
        /// <returns>返回 true 表示当前章节和歌曲均允许进入。</returns>
        public bool RefreshUnlockState()
        {
            UnlockSaveModule unlockSaveModule = GameSaveManager.instance?.UnlockSaveModule;
            ChapterSelectionUnit currentChapter = ChapterSelectionManager.instance?.currentChapter;
            isLocked = unlockSaveModule == null || !unlockSaveModule.CanEnterSong(currentChapter, connectedSong);

            if (lockMark != null)
            {
                lockMark.gameObject.SetActive(isLocked);
            }

            return !isLocked;
        }

        private void Update()
        {
            RectTransform centerPoint = songListController.centerPoint;
            RectTransform rectTransform = GetComponent<RectTransform>();
            
            distanceToCenter = Mathf.Abs(centerPoint.position.y - rectTransform.position.y);
            float x1 = Mathf.Sqrt(distanceToCenter) * 25 + 25;
            float x2 = distanceToCenter * 5 + 25;
            float x3 = Mathf.Pow(distanceToCenter, 2) / 10f + 25;
            rectTransform.GetChild(0).GetComponent<RectTransform>().anchoredPosition = new Vector2(x2, 0);
        }
    }

    public partial class SongSelectionTab
    {
        public void SetSelection(bool isSelected)
        {
            if (isSelected)
            {
                background.DOScaleY(1.2f, 0.25f)
                    .SetEase(Ease.OutQuad)
                    .Play();
                
               selectedImage.DOFade(1, 0.25f)
                    .SetEase(Ease.OutQuad)
                    .Play();
            }
            else
            {
                background.DOScaleY(1f, 0.25f)
                    .SetEase(Ease.OutQuad)
                    .Play();
                
                selectedImage.DOFade(0, 0.25f)
                    .SetEase(Ease.OutQuad)
                    .Play();
            }
        }
    }
}