using UnityEngine;
using UnityEngine.UI;

namespace GFGGame
{
    public class PadMaskView : MonoBehaviour
    {
        private static GameObject _ui;
        private Image BorderLeft;
        private Image BorderRight;

        /// <summary>
        /// 打开界面
        /// </summary>
        public static void Open()
        {
            var go = Resources.Load<GameObject>("UUI/Launcher/UIPadMask");
            _ui = GameObject.Instantiate(go);
            DontDestroyOnLoad(_ui);

        }

        /// <summary>
        /// 关闭界面
        /// </summary>
        /// <param name="toDestroy"></param>
        public static void Close()
        {
            GameObject.DestroyImmediate(_ui);
            _ui = null;
        }

        private void Start()
        {
            BorderLeft = _ui.transform.Find("BorderLeft").GetComponent<Image>();
            BorderRight = _ui.transform.Find("BorderRight").GetComponent<Image>();
            InitBorder();
        }

        private void InitBorder()
        {
            //这里做了最大宽度适配
            float targetWidth;
            float maxAspectRatio = 1080 * 1.0f / 1920;
            if (Screen.width * 1.0f / Screen.height > maxAspectRatio)
            {
                targetWidth = Screen.height * maxAspectRatio;
            }
            else
            {
                targetWidth = Screen.width;
            }
            float leftX = - targetWidth / 2;
            float rightX = -leftX;
            float maskWidth = (Screen.width - targetWidth) / 2;
            BorderLeft.rectTransform.anchoredPosition = new Vector2(leftX, 0);
            BorderRight.rectTransform.anchoredPosition = new Vector2(rightX, 0);
            BorderLeft.rectTransform.sizeDelta = new Vector2(maskWidth, BorderLeft.rectTransform.sizeDelta.y);
            BorderRight.rectTransform.sizeDelta = BorderLeft.rectTransform.sizeDelta;
        }
    }
}