using System;
using System.Collections.Generic;
using System.Text;
using UnityEngine;

namespace Thousandto.Core.Base
{
    /// <summary>
    /// 屏幕系统
    /// </summary>
    public class ScreenSystem
    {
        //定义的标准的宽高16:9
        public const int STAND_WIDTH = 1136;
        public const int STAND_HEIGHT = 640;

        //宽高比例
        private static int scaleWidth = 0;
        private static int scaleHeight = 0;

        //是否初始化
        private static bool _isInitialized = false;
        //是否是安卓
        private static bool _isAndroid = false;

        //初始化
        public static void Initialize( bool isAndroid)
        {
            //设置屏幕不可以休眠
            Screen.sleepTimeout = SleepTimeout.NeverSleep;

            //记录判断是不是android
            _isAndroid = isAndroid;

            //初始化修改屏幕的大小
            if (!_isInitialized)
            {
                SetMaxDesignContent();
            }
            _isInitialized = true;
        }

        //设置屏幕的设计内容的比率
        //android下面的修改
        public static void SetDesignContentScale()
        {
            if (!_isAndroid) return;
            if (scaleWidth == 0 && scaleHeight == 0)
            {
                int width = Screen.currentResolution.width;
                int height = Screen.currentResolution.height;
                int designWidth = STAND_WIDTH;
                int designHeight = STAND_HEIGHT;
                float s1 = (float)designWidth / (float)designHeight;
                float s2 = (float)width / (float)height;
                if (s1 < s2)
                {
                    designWidth = (int)Mathf.FloorToInt(designHeight * s2);
                }
                else if (s1 > s2)
                {
                    designHeight = (int)Mathf.FloorToInt(designWidth / s2);
                }
                float contentScale = (float)designWidth / (float)width;
                if (contentScale < 1.0f)
                {
                    scaleWidth = designWidth;
                    scaleHeight = designHeight;
                }
            }
            if (scaleWidth > 0 && scaleHeight > 0)
            {
                if (scaleWidth % 2 == 0)
                {
                    scaleWidth += 1;
                }
                else
                {
                    scaleWidth -= 1;
                }
                Screen.SetResolution(scaleWidth, scaleHeight, true);
            }
        }

        //设置屏幕的设计内容的比率
        //android下面的修改
        public static void SetMaxDesignContent()
        {   
            if (!_isAndroid) return;
            var resolutions = Screen.resolutions;
            if (resolutions != null && resolutions.Length > 0)
            {
                //设置为显示器支持的最大分辨率
                var size = resolutions[resolutions.Length - 1];
                Screen.SetResolution(size.width, size.height, true);
            }
        }
 
    }
}