//
//  CaptureDeviceLiveKey.swift
//  Zashi
//
//  Created by Lukáš Korba on 11.11.2022.
//

import AVFoundation
import ComposableArchitecture

extension CaptureDeviceClient: DependencyKey {
    public static let liveValue = Self(
        isAuthorized: {
            AVCaptureDevice.authorizationStatus(for: .video) == .authorized
        },
        isTorchAvailable: {
            guard let videoCaptureDevice = AVCaptureDevice.default(for: .video) else {
                return false
            }

            return videoCaptureDevice.hasTorch
        },
        torch: { isTorchOn in
            var device: AVCaptureDevice?
            
            if #available(iOS 17, *) {
                device = AVCaptureDevice.userPreferredCamera
            } else {
                let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInTripleCamera, .builtInDualWideCamera, .builtInUltraWideCamera, .builtInWideAngleCamera, .builtInTrueDepthCamera], mediaType: AVMediaType.video, position: .back)
                device = deviceDiscoverySession.devices.first
            }
            guard let device else {
                throw CaptureDeviceClientError.captureDevice
            }
            
            if device.hasTorch && device.isTorchAvailable {
                do {
                    try device.lockForConfiguration()
                    if isTorchOn {
                        try device.setTorchModeOn(level: 1.0)
                    } else {
                        device.torchMode = .off
                    }
                    device.unlockForConfiguration()
                } catch {
                    throw CaptureDeviceClientError.lockForConfiguration
                }
            } else {
                throw CaptureDeviceClientError.torchUnavailable
            }
        }
    )
}