using System.Collections.Generic;
using Cielonos.Core.SceneManagement;
using DG.Tweening;
using SLSUtilities.General;
using SLSUtilities.UI;
using SLSUtilities.WwiseAssistance;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Serialization;
using UnityEngine.UI;

namespace Cielonos.MainGame.UI
{
    /// <summary>
    /// 暂停界面页面。
    /// <para>
    /// 打开时暂停游戏（<c>Time.timeScale = 0</c>），
    /// 关闭时恢复游戏。
    /// 提供三个按钮：继续游戏、打开设置、返回标题界面。
    /// 返回标题界面时会弹出 <see cref="ConfirmUIPage"/> 二次确认。
    /// </para>
    /// </summary>
    public class PauseUIPage : UIPageBase
    {
        // ──────────────────── 按钮引用 ────────────────────

        [FormerlySerializedAs("continueButton")]
        [Header("Buttons")]
        [SerializeField] private Button resumeButton;
        [SerializeField] private Button settingsButton;
        [SerializeField] private Button returnToMenuButton;

        // ──────────────────── 配置 ────────────────────────

        [Header("Scene")]
        [Tooltip("标题界面的场景名称，通过 SceneBus 加载。")]
        [SerializeField] private string titleSceneName = "Menu";

        // ──────────────────── 生命周期 ────────────────────

        protected override void Start()
        {
            base.Start();
            resumeButton.onClick.AddListener(OnContinueClicked);
            settingsButton.onClick.AddListener(OnSettingsClicked);
            returnToMenuButton.onClick.AddListener(OnReturnToTitleClicked);
        }

        public override void Open()
        {
            if (IsOpen) return;
            IsOpen = true;
            Time.timeScale = 0f;
            UIPageManager.Instance.RegisterPage(this);
            EventSystem.current?.SetSelectedGameObject(null);
            gameObject.SetActive(true);
            canvasGroup.interactable = true;
            canvasGroup.DOFade(1f, 0.3f).From(0f).SetUpdate(true)
                .OnComplete(() =>
                {
                    canvasGroup.blocksRaycasts = true;
                    OnPageOpened();
                }).Play();
        }

        public override void Close()
        {
            if (!IsOpen) return;
            IsOpen = false;
            UIPageManager.Instance.UnregisterPage(this);
            canvasGroup.DOFade(0f, 0.3f).From(1f).SetUpdate(true)
                .OnComplete(() =>
                {
                    canvasGroup.interactable = false;
                    canvasGroup.blocksRaycasts = false;
                    OnPageClosed();
                    Time.timeScale = 1f;
                }).Play();
        }

        // ──────────────────── 按钮回调 ────────────────────

        private void OnContinueClicked()
        {
            Close();
        }

        private void OnSettingsClicked()
        {
            PlayerCanvas.SettingsUIPage.Open();
        }

        /// <summary>
        /// 点击"返回主菜单"按钮时，弹出确认弹窗而非直接切换场景。
        /// </summary>
        private void OnReturnToTitleClicked()
        {
            ConfirmUIPage.Show(new ConfirmPageConfig
            {
                Title = "ConfirmReturnToMenu_Title".Localize("UI"),
                Description = "ConfirmReturnToMenu_Desc".Localize("UI"),
                Buttons = new List<ConfirmButtonConfig>
                {
                    new("Confirm".Localize("UI"), ReturnToMenu),
                    new("Cancel".Localize("UI"))
                }
            });
        }

        /// <summary>
        /// 用户确认后执行的返回主菜单逻辑。
        /// </summary>
        private void ReturnToMenu()
        {
            Time.timeScale = 1f;
            AudioManager.Instance.backgroundMusicManager.TransitionToNextScene();
            UIPageManager.Instance.CloseAllPages();
            SceneBus.LoadScene(titleSceneName);
        }
    }
}