using UnityEngine;
using UnityEngine.UI;
using BaseGames.Core.Assets;
using BaseGames.Core.Events;

namespace BaseGames.UI
{
    /// <summary>
    /// 暂停菜单控制器（架构 10_UIModule §5）。
    /// 挂载在 Canvas_Menu → PauseMenuPanel GameObject 上。
    /// 按钮绑定在 Awake 中完成；生命周期 / 焦点由 <see cref="UIPanelBase"/> 统一处理。
    /// </summary>
    public class PauseMenuController : UIPanelBase
    {
        // UIManager 通过 ServiceLocator 解析，开启时自动获取，无需 Inspector 直接绑定具体类型
        private IUIManager _uiManager;

        [Header("按钮引用")]
        [SerializeField] private Button _btnResume;
        [SerializeField] private Button _btnSettings;
        [SerializeField] private Button _btnMainMenu;
        [SerializeField] private Button _btnQuit;

        [Header("Event Channels")]
        [SerializeField] private VoidEventChannelSO                _onResumeRequested;
        [SerializeField] private SceneLoadRequestEventChannelSO    _onSceneLoadRequest;

        private void Awake()
        {
            _btnResume?.onClick.AddListener(Resume);
            _btnSettings?.onClick.AddListener(OpenSettings);
            _btnMainMenu?.onClick.AddListener(GoToMainMenu);
            _btnQuit?.onClick.AddListener(Application.Quit);
        }

        // 暂停面板由 UIManager 开启，此时 ServiceLocator 已就绪
        protected override void OnPanelOpen()  => _uiManager = GetService<IUIManager>();
        protected override void OnPanelClose() => _uiManager = null;

        /// <summary>默认焦点 / 焦点恢复回到"继续"按钮（基类 FocusFirst 调用）。</summary>
        protected override GameObject ResolveFirstSelected()
            => _btnResume != null ? _btnResume.gameObject : null;

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

        private void Resume()
        {
            _onResumeRequested?.Raise();
            _uiManager?.CloseTopPanel();
        }

        private void OpenSettings()
        {
            _uiManager?.OpenPanel(PanelId.Settings);
        }

        private void GoToMainMenu()
        {
            _uiManager?.CloseTopPanel();
            _onSceneLoadRequest?.Raise(new SceneLoadRequest
            {
                SceneName         = AddressKeys.SceneMainMenu,
                TransitionType    = TransitionType.Scene,
                ShowLoadingScreen = false,
            });
        }
    }
}