using UnityEngine;

namespace Ashwild.UI
{
    /// <summary>
    /// Main-menu UI manager. Escape navigates the panel stack backwards; when already at the
    /// default panel (the main menu) it opens a fallback panel instead — typically the
    /// quit-confirmation. Put this on the menu canvas; gameplay uses <see cref="GameUIManager"/>.
    /// </summary>
    [DisallowMultipleComponent]
    public class MenuUIManager : UIManager
    {
        #region Serialized Fields

        [Header("Menu Escape")]
        [Tooltip("Panel opened by Escape when already on the default (main menu) panel — e.g. ConfirmQuitPanel.")]
        [SerializeField] private UIPanel escapeFallbackPanel;

        #endregion

        #region Escape Policy

        /// <summary>
        /// Escape: close the fallback if it is up, otherwise step back through the stack,
        /// and finally open the fallback when sitting on the default panel.
        /// </summary>
        protected override void OnEscape()
        {
            if (Current == null) return;

            if (escapeFallbackPanel != null && Current == escapeFallbackPanel)
            {
                Back();
                return;
            }

            if (Current != defaultPanel)
            {
                Back();
                return;
            }

            if (escapeFallbackPanel != null)
                OpenPanel(escapeFallbackPanel);
        }

        #endregion
    }
}