react-native-vision-camera/android/src/main/java/com/mrousavy/camera/utils/AspectRatio.kt

package com.mrousavy.camera.utils

import androidx.camera.core.AspectRatio
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.min

private const val RATIO_4_3_VALUE = 4.0 / 3.0
private const val RATIO_16_9_VALUE = 16.0 / 9.0

/**
 *  [androidx.camera.core.ImageAnalysisConfig] requires enum value of
 *  [androidx.camera.core.AspectRatio]. Currently it has values of 4:3 & 16:9.
 *
 *  Detecting the most suitable ratio for dimensions provided in @params by counting absolute
 *  of preview ratio to one of the provided values.
 *
 *  @param width - preview width
 *  @param height - preview height
 *  @return suitable aspect ratio
 */
fun aspectRatio(width: Int, height: Int): Int {
  val previewRatio = max(width, height).toDouble() / min(width, height)
  if (abs(previewRatio - RATIO_4_3_VALUE) <= abs(previewRatio - RATIO_16_9_VALUE)) {
    return AspectRatio.RATIO_4_3
  }
  return AspectRatio.RATIO_16_9
}