using System;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using TMPro;

namespace BaseGames.UI
{
    /// <summary>
    /// 通用可选择行：图标 + 标签 + 选中高亮 + 按钮，适用于菜单项、设置行、存档槽、列表项。
    ///
    /// 配合 <see cref="PooledListView{TData,TView}"/> 作 TView，或在面板里直接布局使用。
    /// 选中（手柄/键盘导航或鼠标悬停）时自动切换高亮节点。
    /// </summary>
    [DisallowMultipleComponent]
    public class UISelectableRow : MonoBehaviour, ISelectHandler, IDeselectHandler, IPointerEnterHandler
    {
        [Header("引用")]
        [SerializeField] private Button     _button;
        [SerializeField] private TMP_Text   _label;
        [Tooltip("行图标（可空）。")]
        [SerializeField] private Image      _icon;
        [Tooltip("选中高亮节点（可空，选中时 SetActive(true)）。")]
        [SerializeField] private GameObject _selectedHighlight;

        /// <summary>行被点击（或 Submit）时触发。</summary>
        public event Action Clicked;

        public Button Button => _button;
        public Selectable Selectable => _button;

        private void Awake()
        {
            if (_selectedHighlight != null) _selectedHighlight.SetActive(false);
            if (_button != null)
                _button.onClick.AddListener(() => Clicked?.Invoke());
        }

        // ── 数据填充 ──────────────────────────────────────────────────────────
        public void SetLabel(string text)
        {
            if (_label != null) _label.text = text;
        }

        public void SetIcon(Sprite sprite)
        {
            if (_icon == null) return;
            _icon.sprite  = sprite;
            _icon.enabled = sprite != null;
        }

        public void SetSelected(bool selected)
        {
            if (_selectedHighlight != null) _selectedHighlight.SetActive(selected);
        }

        /// <summary>把 EventSystem 焦点设到本行。</summary>
        public void Focus()
        {
            if (_button != null && EventSystem.current != null)
                EventSystem.current.SetSelectedGameObject(_button.gameObject);
        }

        // ── 选中反馈 ──────────────────────────────────────────────────────────
        public void OnSelect(BaseEventData e)   => SetSelected(true);
        public void OnDeselect(BaseEventData e) => SetSelected(false);

        public void OnPointerEnter(PointerEventData e)
        {
            if (_button != null && _button.interactable && EventSystem.current != null)
                EventSystem.current.SetSelectedGameObject(_button.gameObject);
        }
    }
}