using TMPro;
using UnityEngine;

namespace Cielonos.Settings.UI
{
    /// <summary>
    /// 设置界面右侧的悬停说明面板。
    /// <para>
    /// 当鼠标悬停到某个 SettingsEntry 时显示该条目的标题和说明文本，
    /// 鼠标离开后隐藏。此面板不是 <see cref="SLSUtilities.UI.UIPageBase"/>，
    /// 按 ESC 时由设置界面整体处理退出逻辑。
    /// </para>
    /// </summary>
    public class SettingsDescriptionPanel : MonoBehaviour
    {
        [SerializeField] private TMP_Text titleText;
        [SerializeField] private TMP_Text descriptionText;
        [SerializeField] private CanvasGroup canvasGroup;

        private void Awake()
        {
            if (canvasGroup == null)
                canvasGroup = GetComponent<CanvasGroup>();

            Hide();
        }

        /// <summary>
        /// 显示说明面板。如果 description 为空则不显示。
        /// </summary>
        /// <param name="title">条目标题。</param>
        /// <param name="description">条目说明文本。</param>
        public void Show(string title, string description)
        {
            if (string.IsNullOrEmpty(description))
            {
                Hide();
                return;
            }

            if (titleText != null)
                titleText.text = title;

            if (descriptionText != null)
                descriptionText.text = description;

            SetVisible(true);
        }

        /// <summary>
        /// 隐藏说明面板。
        /// </summary>
        public void Hide()
        {
            SetVisible(false);
        }

        private void SetVisible(bool visible)
        {
            if (canvasGroup != null)
            {
                canvasGroup.alpha = visible ? 1f : 0f;
                canvasGroup.blocksRaycasts = visible;
            }
            else
            {
                gameObject.SetActive(visible);
            }
        }
    }
}