Camera

//
//  ViewController.swift
//  University
//
//  Created by God on 03/01/2017.
//  Copyright © 2017 xapp. All rights reserved.
//

import UIKit
import AVFoundation

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    @IBOutlet weak var cameraView: UIImageView!
    var captureSession = AVCaptureSession()
    var sessionOutput = AVCapturePhotoOutput()
    var sessionOutputSetting = AVCapturePhotoSettings(format: [AVVideoCodecKey:AVVideoCodecJPEG])
    var previewLayer = AVCaptureVideoPreviewLayer()
    
    // Bool to manage camera toggle. False = front-face (default)
    var toggle = false
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(true)
        
        pickCamera(which: toggle);
    }
    
    func pickCamera(which: Bool) {
        if (which == true) {
            let deviceDescovery = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDualCamera, AVCaptureDeviceType.builtInTelephotoCamera, AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.back)
            print("back camera starting")
            startCamera(deviceDesc: deviceDescovery!)
            toggle = true;
           
        } else if (which == false) {
            let deviceDescovery = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDualCamera, AVCaptureDeviceType.builtInTelephotoCamera, AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.front)
            print("front camera starting")
            startCamera(deviceDesc: deviceDescovery!)
            toggle = false;
        
        }
    }
    
    
    
    func startCamera(deviceDesc: AVCaptureDeviceDiscoverySession!) {
        for device in (deviceDesc.devices)! {
            if (device.position == AVCaptureDevicePosition.back) {
                do {
                    let input = try AVCaptureDeviceInput(device: device)
                    if (captureSession.canAddInput(input)) {
                        captureSession.addInput(input)
                        
                        if (captureSession.canAddOutput(sessionOutput)) {
                            captureSession.addOutput(sessionOutput)
                        
                            previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                            previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
                            previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.portrait
                            
                            cameraView.layer.addSublayer(previewLayer)
                            captureSession.startRunning()
                        } else { print("Cannot add input - back") }
                    }
                }
                catch {
                    print("Exception")
                }
            } else if (device.position == AVCaptureDevicePosition.front) {
                do {
                    let input = try AVCaptureDeviceInput(device: device)
                    print(input)
                    if (captureSession.canAddInput(input)) {
                        captureSession.addInput(input)
                        
                        if (captureSession.canAddOutput(sessionOutput)) {
                            captureSession.addOutput(sessionOutput)
                            previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                            previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
                            previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.portrait
                            
                            cameraView.layer.addSublayer(previewLayer)
                            captureSession.startRunning()
                        }
                    } else { print("Cannot add input - front") }
                }
                catch {
                    print(error)
                }
            }
        }
        
    }
    
    @IBOutlet weak var tempImageView: UIImageView!
    

    @IBAction func takePhoto(_sender: Any) {
        print("Taking Photo")
   
        
    }
    
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        previewLayer.frame = cameraView.bounds
    }

    
    @IBAction func toggleCamera(_ sender: Any) {
        if (toggle == false) {
            print("Changing to back camera")
            let currentCameraInput: AVCaptureInput = captureSession.inputs[0] as! AVCaptureInput
            captureSession.removeInput(currentCameraInput)
            toggle = true;
            pickCamera(which: toggle)
 
        } else if (toggle == true) {
            print("Changing to front camera")
            let currentCameraInput: AVCaptureInput = captureSession.inputs[0] as! AVCaptureInput
            captureSession.removeInput(currentCameraInput)
            toggle = false;
            pickCamera(which: toggle)
        }
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}