using UnityEngine;

namespace WZ
{
    public class PX2DP
    {
#if UNITY_ANDROID && !UNITY_EDITOR
    private static AndroidJavaClass _unityPlayerClass;
    private static AndroidJavaObject _currentActivity;
    private static AndroidJavaObject _resources;
    private static AndroidJavaObject _displayMetrics;
    
    // 初始化Android相关类引用
    private static void Init()
    {
        if (_unityPlayerClass == null)
        {
            _unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
            _currentActivity = _unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
            _resources = _currentActivity.Call<AndroidJavaObject>("getResources");
            _displayMetrics = _resources.Call<AndroidJavaObject>("getDisplayMetrics");
        }
    }
#endif

        /// <summary>
        /// Android平台dp转px
        /// </summary>
        /// <param name="dp">需要转换的dp值</param>
        /// <returns>转换后的px值</returns>
        public static int DpToPx(float dp)
        {
#if UNITY_ANDROID && !UNITY_EDITOR
        Init();
        float scale = _displayMetrics.Get<float>("density");
        return (int)(dp * scale + 0.5f);
#else
            // 非Android平台返回近似值
            return Mathf.RoundToInt(dp * Screen.dpi / 160f);
#endif
        }

        /// <summary>
        /// Android平台px转dp
        /// </summary>
        /// <param name="px">需要转换的px值</param>
        /// <returns>转换后的dp值</returns>
        public static int PxToDp(float px)
        {
#if UNITY_ANDROID && !UNITY_EDITOR
        Init();
        float scale = _displayMetrics.Get<float>("density");
        return (int)(px / scale + 0.5f);
#else
            // 非Android平台返回近似值
            return Mathf.RoundToInt(px * 160f / Screen.dpi);
#endif
        }
    }
}