using UnityEngine;

namespace Kill.UI.Components
{
    /// <summary>
    /// 全局Loading组件
    /// 调用 LoadingUI.Show() 显示，LoadingUI.Hide() 隐藏
    /// </summary>
    public class LoadingUI : MonoBehaviour
    {
        public static LoadingUI Instance { get; private set; }

        [Header("UI引用")]
        public GameObject loadingPanel;
        public Animation loadingAni;

        private int showCount = 0;

        private void Awake()
        {
            if (Instance == null)
            {
                Instance = this;
                DontDestroyOnLoad(gameObject);
            }
            else
            {
                Destroy(gameObject);
            }
        }

        private void Start()
        {
            Hide();
        }

        /// <summary>
        /// 显示Loading
        /// </summary>
        public static void Show()
        {
            if (Instance == null) return;
            Instance.showCount++;
            if (Instance.showCount == 1)
            {
                Instance.loadingPanel.SetActive(true);
                if (Instance.loadingAni != null)
                    Instance.loadingAni.Play();
            }
        }

        /// <summary>
        /// 隐藏Loading
        /// </summary>
        public static void Hide()
        {
            if (Instance == null) return;
            Instance.showCount = Mathf.Max(0, Instance.showCount - 1);
            if (Instance.showCount == 0)
            {
                if (Instance.loadingAni != null)
                    Instance.loadingAni.Stop();

                Instance.loadingPanel.SetActive(false);
            }
        }

        /// <summary>
        /// 强制隐藏（动画回调用）
        /// </summary>
        public void OnHideAnimationComplete()
        {
            if (showCount == 0)
                loadingPanel.SetActive(false);
        }

        /// <summary>
        /// 强制隐藏
        /// </summary>
        public static void ForceHide()
        {
            if (Instance == null) return;
            Instance.showCount = 0;
            Instance.loadingPanel.SetActive(false);
        }
    }
}