using UnityEngine;
using UnityEngine.UI;
using UnityEngine.InputSystem;

public sealed class InputGlyphImage : MonoBehaviour
{
    [SerializeField] private InputActionReference actionReference;
    [SerializeField] private Image targetImage;
    [SerializeField] private bool hideIfMissing = false;
    [SerializeField] private GameObject hideTargetObject;

    private InputDeviceWatcher.InputDeviceCategory _cachedCategory;
    private Sprite _cachedSprite;

    /// <summary>
    /// 启用时初始化组件并订阅设备变更事件
    /// </summary>
    void OnEnable()
    {
        if (targetImage == null) targetImage = GetComponent<Image>();
        InputDeviceWatcher.OnDeviceChanged += OnDeviceChanged;
        _cachedCategory = InputDeviceWatcher.InputDeviceCategory.Keyboard;
        UpdatePrompt();
    }

    /// <summary>
    /// 禁用时取消订阅设备变更事件
    /// </summary>
    void OnDisable()
    {
        InputDeviceWatcher.OnDeviceChanged -= OnDeviceChanged;
    }

    /// <summary>
    /// 设备类型变更时的回调，更新图标显示
    /// </summary>
    void OnDeviceChanged(InputDeviceWatcher.InputDeviceCategory cat)
    {
        if (_cachedCategory != cat)
        {
            _cachedCategory = cat;
            UpdatePrompt();
        }
    }

    /// <summary>
    /// 更新输入提示图标，并根据配置控制目标对象的显示/隐藏
    /// </summary>
    void UpdatePrompt()
    {
        if (actionReference == null || actionReference.action == null || targetImage == null) return;

        // 使用缓存的设备类型，避免重复查询 CurrentCategory
        if (GlyphService.TryGetUISpriteForActionPath(actionReference, "", _cachedCategory, out Sprite sprite))
        {
            if (_cachedSprite != sprite)
            {
                _cachedSprite = sprite;
                targetImage.sprite = sprite;
            }
        }

        if (hideTargetObject != null)
        {
            bool shouldBeActive = sprite != null && !hideIfMissing;
            if (hideTargetObject.activeSelf != shouldBeActive)
            {
                hideTargetObject.SetActive(shouldBeActive);
            }
        }
    }
}