package com.xw.common.utils

import android.app.Activity
import android.app.Application
import com.xw.common.utils.LogUtils

class ScreenAdaptationUtil {

    companion object {

        var TAG = "ScreenAdaptationUtil"

        // 系统初始适配值
        private var systemDefaultDensity = 0f
        private var systemDefaultDensityDpi = 0
        private var systemDefaultScaledDensity = 0f

        @JvmStatic
        fun setCustomDensity(activity: Activity, application: Application) {
            setCustomDensity(activity, application, 375f)
        }

        fun setCustomDensity(activity: Activity, application: Application, designDp: Float) {
            /**
             * android中适配的单位换算值
             * px = density * dp;
             * density = dpi / 160;
             * px = dp * (dpi / 160);
             *
             * dpi是根据屏幕真实的分辨率和尺寸来计算的，每个设备都可能不一样的。
             *
             * dpi= (宽平方 + 高平方) 开根 / 屏幕尺寸
             *
             */
            val displayMetrics = application.resources.displayMetrics
            if (systemDefaultDensity == 0f) {
                systemDefaultDensity = displayMetrics.density
            }
            if (systemDefaultDensityDpi == 0) {
                systemDefaultDensityDpi = displayMetrics.densityDpi
            }
            if (systemDefaultScaledDensity == 0f) {
                systemDefaultScaledDensity = displayMetrics.scaledDensity
            }

            var fc = activity.resources.configuration.fontScale
            fc = 1f // 强制字体大小不随系统

            /**
             * 此处以540dp的设计图作为例子 此处需要加上f  int / int 得值 int 会导致适配有变形
             */
            val targetDensity = displayMetrics.widthPixels / designDp
            val targetScaledDensity = targetDensity * (systemDefaultScaledDensity / fc / systemDefaultDensity)
            val targetDensityDpi = (160 * targetDensity).toInt()
            displayMetrics.density = targetDensity
            displayMetrics.scaledDensity = targetScaledDensity
            displayMetrics.densityDpi = targetDensityDpi
            val activityDisplayMetrics = activity.resources.displayMetrics
            activityDisplayMetrics.density = targetDensity
            activityDisplayMetrics.scaledDensity = targetScaledDensity
            activityDisplayMetrics.densityDpi = targetDensityDpi
        }

        /**
         * 取消屏幕适配
         *
         * @param activity
         * @param application
         */
        @JvmStatic
        fun restoreCustomDensity(activity: Activity, application: Application) {
            if (systemDefaultDensity == 0f || systemDefaultScaledDensity == 0f || systemDefaultDensityDpi == 0) { //                LogUtils.e(TAG, "重置失败，系统初始适配值错误")
                return
            }
            val displayMetrics = application.resources.displayMetrics
            displayMetrics.density = systemDefaultDensity
            displayMetrics.scaledDensity = systemDefaultScaledDensity
            displayMetrics.densityDpi = systemDefaultDensityDpi
            val activityDisplayMetrics = activity.resources.displayMetrics
            activityDisplayMetrics.density = systemDefaultDensity
            activityDisplayMetrics.scaledDensity = systemDefaultScaledDensity
            activityDisplayMetrics.densityDpi = systemDefaultDensityDpi
        }
    }
}