//
//  AVCaptureOutput+mirror.swift
//  mrousavy
//
//  Created by Marc Rousavy on 18.01.21.
//  Copyright © 2021 mrousavy. All rights reserved.
//

import AVFoundation

extension AVCaptureOutput {
  /**
   Mirrors the video output if possible.
   */
  func mirror() {
    connections.forEach { connection in
      if connection.isVideoMirroringSupported {
        connection.automaticallyAdjustsVideoMirroring = false
        connection.isVideoMirrored = true
      }
    }
  }

  /**
   Sets the target orientation of the video output.
   This does not always physically rotate image buffers.

   - For Preview, an orientation hint is used to rotate the layer/view itself.
   - For Photos, an EXIF tag is used.
   - For Videos, the buffers are physically rotated if available, since we use an AVCaptureVideoDataOutput instead of an AVCaptureMovieFileOutput.
   */
  func setOrientation(_ orientation: Orientation) {
    // Camera Sensors are always in 90deg rotation.
    // We are setting the target rotation here, so we need to rotate by 90deg once.
    let cameraOrientation = orientation.rotateRight()

    // Set orientation for each connection
    connections.forEach { connection in
      // TODO: Use this once Xcode 15 is rolled out
      // if #available(iOS 17.0, *) {
      //   let degrees = cameraOrientation.toDegrees()
      //   if connection.isVideoRotationAngleSupported(degrees) {
      //     connection.videoRotationAngle = degrees
      //   }
      // } else {
      if connection.isVideoOrientationSupported {
        connection.videoOrientation = cameraOrientation.toAVCaptureVideoOrientation()
      }
      // }
    }
  }
}