///
/// HybridCameraPreviewOutput.swift
/// VisionCamera
/// Copyright © 2025 Marc Rousavy @ Margelo
///

import AVFoundation
import Foundation
import NitroModules

final class HybridCameraPreviewOutput: HybridCameraPreviewOutputSpec, NativePreviewViewOutput {
  let mediaType: MediaType = .video
  let previewLayer: AVCaptureVideoPreviewLayer
  private let orientationManager = HybridInterfaceOrientationManager()
  var outputOrientation: CameraOrientation {
    get {
      return previewLayer.connection?.orientation ?? .up
    }
    set {
      // Setting orientation on a Preview output does nothing,
      // as its orientation is always driven by the `orientationManager`.
    }
  }
  var currentResolution: Size? {
    guard let connection = previewLayer.connection else { return nil }
    return connection.inputStreamResolution
  }

  var streamType: StreamType = .video
  var targetResolution: ResolutionRule {
    let screenSizeDp = UIScreen.main.bounds.size
    let pixelRatio = UIScreen.main.scale
    let screenSizePx = Size(
      width: screenSizeDp.width * pixelRatio,
      height: screenSizeDp.height * pixelRatio)
    return .min(screenSizePx)
  }

  override init() {
    self.previewLayer = AVCaptureVideoPreviewLayer()
    self.previewLayer.videoGravity = .resizeAspectFill
    super.init()
    self.orientationManager.startOrientationUpdates { [weak self] orientation in
      guard let self else { return }
      if let connection = self.previewLayer.connection {
        try? connection.setOrientation(orientation)
      }
    }
  }

  deinit {
    orientationManager.stopOrientationUpdates()
  }

  func configure(config: CameraOutputConfiguration) {
    guard let connection = previewLayer.connection else {
      return
    }
    try? connection.setMirrorMode(config.mirrorMode)
    if let interfaceOrientation = orientationManager.currentOrientation {
      try? connection.setOrientation(interfaceOrientation)
    }
  }
}