LONDON-IOS/GME Remit/Utilities/MultiMediaManager.swift

//
//  MultiMediaManager.swift
//
//
//  Created by shishir sapkota
//

import UIKit
import Foundation
import AVFoundation
import Photos
//import RSKImageCropper

@objc protocol MultiMediaManagerDelegate {
  @objc optional func cropSize() -> CGSize
  @objc optional func didFinishPickingWithImage(image: UIImage)
  func didFinishPickingWithError(error: String)
  @objc optional func didFinishPickingVideo(url: URL)
}

@objc protocol MultimediaPresenterProtocol {
  func presenting() -> UIViewController
}

class MultiMediaManager: NSObject {
  private let imagePicker = UIImagePickerController()
  private weak var presenter: MultimediaPresenterProtocol?
  weak var delegate: MultiMediaManagerDelegate?
  
  init(presenter: MultimediaPresenterProtocol) {
    self.presenter = presenter
    super.init()
    imagePicker.delegate  = self
    imagePicker.allowsEditing = true
  }
  
  func openPicker(mode: UIImagePickerController.CameraCaptureMode) {
    var presentationStyle: UIAlertController.Style = .actionSheet
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.pad) {
      presentationStyle = .alert
    }
    
    let alertController = UIAlertController(
      title: nil,
      message: "Gme would like to access your camera",
      preferredStyle: presentationStyle
    )
    
    let cameraAction = UIAlertAction(
      title: "camera_text".localized(),
      style: UIAlertAction.Style.default
    ) { (_) in
      self.openCamera(mode: .photo)
    }
    
    let galleryAction = UIAlertAction(
      title: "gallery_text".localized(),
      style: UIAlertAction.Style.default
    ) { (_) in
      self.showPhotoGallery(mode: mode)
    }
    let cancelAction = UIAlertAction(title: "cancel_text".localized(), style: .cancel, handler: nil)
    alertController.addAction(cameraAction)
    alertController.addAction(galleryAction)
    alertController.addAction(cancelAction)
    self.presentViewController(viewController: alertController, animated: true, completion: nil)
  }
  
  private func presentViewController(
    viewController: UIViewController,
    animated: Bool,
    completion: (() -> Void)?
  ) {
    OperationQueue.main.addOperation {
      self.presenter?.presenting().present(viewController, animated: animated, completion: completion)
    }
  }
  
  func openCamera(mode: UIImagePickerController.CameraCaptureMode) {
    func openPicker() {
      self.imagePicker.sourceType = UIImagePickerController.SourceType.camera
      let mediaTypes =  ["public.image"]
      self.imagePicker.mediaTypes = mediaTypes
      self.imagePicker.cameraCaptureMode = mode
      self.imagePicker.allowsEditing = false
      self.presentViewController(viewController: self.imagePicker, animated: true, completion: nil)
    }
    
    PermissionHelper.isAllowedToRecordVideo { (isAllowed) in
      if isAllowed {
        openPicker()
      } else {
        self.presenter?.presenting().alert(message: "camera_access_denied_text", okAction: {
          UIApplication.tryURL(url: UIApplication.openSettingsURLString)
        })
      }
    }
  }
  
  private func showPhotoGallery(mode: UIImagePickerController.CameraCaptureMode) {
    PermissionHelper.isAllowedToShowGallary { (isAllowed) in
      DispatchQueue.main.async {
        if isAllowed {
          self.imagePicker.allowsEditing = false
          self.imagePicker.sourceType = UIImagePickerController.SourceType.photoLibrary
          let mediaTypes = mode == .video ? ["public.image", "public.movie"] : ["public.image"]
          self.imagePicker.mediaTypes = mediaTypes
          self.presentViewController(viewController: self.imagePicker, animated: true, completion: nil)
        } else {
          self.presenter?.presenting().alert(
            message: "galery_access_denied_text".localized(),
            okAction: {
              UIApplication.tryURL(url: UIApplication.openSettingsURLString)
          }
          )
        }
      }
    }
  }
  
  func resizeImage(image: UIImage, to targetSize: CGSize) -> UIImage? {
    // This is the rect that we've calculated out and this is what is actually used below
    let rect = CGRect(origin: CGPoint.zero, size: targetSize)
    // Actually do the resizing to the rect using the ImageContext stuff
    UIGraphicsBeginImageContextWithOptions(targetSize, false, 1.0)
    image.draw(in: rect)
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage
  }
}

extension MultiMediaManager: UIImagePickerControllerDelegate {
  func imagePickerController(
    _ picker: UIImagePickerController,
    didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]
  ) {
    let info = Dictionary(uniqueKeysWithValues: info.map {key, value in (key.rawValue, value)})
    
    var completion: (() -> Void)?
    
    if let mediaType = info["UIImagePickerControllerMediaType"] as? String {
      if mediaType == "public.image" {
        if let picture = info[
          UIImagePickerController.InfoKey.originalImage.rawValue
        ] as? UIImage {
          if let cropsize = self.delegate?.cropSize?() {
            if picture.size.width < cropsize.width || picture.size.height < cropsize.height {
              let message = "Image size must be greater than \(cropsize.width) X \(cropsize.height)"
              self.delegate?.didFinishPickingWithError(error: message)
            } else {
              guard let resizedImage = self.resizeImage(image: picture, to: cropsize) else { return }
              completion = {
                self.delegate?.didFinishPickingWithImage?(image: resizedImage)
              }
            }
          } else {
            completion = {
              self.delegate?.didFinishPickingWithImage?(image: picture)
            }
          }
        }
      } else if mediaType == "public.movie" {
//        _ = info["UIImagePickerControllerMediaURL"] as! URL
        return
      }
    }
    picker.dismiss(animated: true) {
      completion?()
    }
  }
}

extension MultiMediaManager: UINavigationControllerDelegate {
  
}

struct PermissionHelper {
  static func isAllowedToRecordVideo(completion: @escaping (Bool) -> Void) {
    let status = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
    completion(status != .denied && status != .restricted)
  }
  
  static func isAllowedToRecordSound(completion: @escaping (Bool) -> Void) {
    AVAudioSession.sharedInstance().requestRecordPermission(completion)
  }
  
  static func isAllowedToShowGallary(completion: @escaping (Bool) -> Void) {
    PHPhotoLibrary.requestAuthorization { (status) in
      completion(status == .authorized)
    }
  }
  
}