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

namespace Cielonos.Settings.UI
{
    /// <summary>
    /// 按钮型设置条目。不绑定到数据字段，而是执行指定的点击动作。
    /// <para>
    /// 典型用途：打开二级 UIPage（如 Key Binding 页面）、触发重置操作等。
    /// 支持鼠标悬停说明面板。
    /// </para>
    /// </summary>
    public class SettingsEntryButton : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        [SerializeField] private TMP_Text labelText;
        [SerializeField] private Button button;

        private Action onClickAction;

        /// <summary>条目的显示标题。</summary>
        public string DisplayLabel { get; private set; }

        /// <summary>条目的说明文本（可为空）。</summary>
        public string Description { get; private set; }

        /// <summary>鼠标悬停进入时触发。由 SettingsUIPage 设置。</summary>
        public Action<string, string> OnHoverEnter { get; set; }

        /// <summary>鼠标悬停离开时触发。由 SettingsUIPage 设置。</summary>
        public Action OnHoverExit { get; set; }

        /// <summary>
        /// 初始化按钮条目。
        /// </summary>
        /// <param name="label">显示标题。</param>
        /// <param name="description">悬停说明文本（可为空）。</param>
        /// <param name="onClick">点击按钮时执行的动作。</param>
        public void Initialize(string label, string description, Action onClick)
        {
            DisplayLabel = label;
            Description = description;
            onClickAction = onClick;

            if (labelText != null)
                labelText.text = label;

            if (button != null)
                button.onClick.AddListener(OnButtonClicked);
        }

        private void OnButtonClicked()
        {
            onClickAction?.Invoke();
        }

        // ──────────────────── 悬停事件 ────────────────────

        public void OnPointerEnter(PointerEventData eventData)
        {
            OnHoverEnter?.Invoke(DisplayLabel, Description);
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            OnHoverExit?.Invoke();
        }

        private void OnDestroy()
        {
            if (button != null)
                button.onClick.RemoveListener(OnButtonClicked);
        }
    }
}