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

//
//  ImageCroper.swift
//  
//
//  Created by shishir sapkota
//

import Foundation
import RSKImageCropper
import Localize_Swift

protocol ImageCropperDelegate: class {
  func didCropWith(image: UIImage)
  func didFailedCropWith(error: Error)
}

class ImageCroper: NSObject {
  
  var imageCropper: RSKImageCropViewController = RSKImageCropViewController()
  weak var presentingViewController: UIViewController?
  
  weak var delegate: ImageCropperDelegate?
  
  fileprivate var cropRatio: CGFloat = 1
  
  init(presentingViewController: UIViewController) {
    super.init()
    self.presentingViewController = presentingViewController
    self.imageCropper.delegate = self
    self.imageCropper.dataSource = self
  }
  
  func cropImage(image: UIImage, ratio: CGFloat = 1) {
    self.cropRatio = ratio
    self.imageCropper = RSKImageCropViewController(image: image, cropMode: .custom)
    imageCropper.chooseButton.setTitle("done_text".localized(), for: .normal)
    imageCropper.cancelButton.setTitle("cancel_text".localized(), for: .normal)
    self.imageCropper.delegate = self
    self.imageCropper.dataSource = self
    self.imageCropper.modalPresentationStyle = .overFullScreen
    self.presentingViewController?.present(imageCropper, animated: true, completion: nil)
  }
}

extension ImageCroper: RSKImageCropViewControllerDelegate {
  
  func imageCropViewControllerDidCancelCrop(_ controller: RSKImageCropViewController) {
    presentingViewController?.dismiss(animated: true, completion: nil)
  }
  
  func imageCropViewController(
    _ controller: RSKImageCropViewController,
    didCropImage croppedImage: UIImage,
    usingCropRect cropRect: CGRect
    ) {
    presentingViewController?.dismiss(animated: true, completion: {
      // image cropped here
      
      self.delegate?.didCropWith(image: croppedImage)
    })
  }
  
  func imageCropViewController(
    _ controller: RSKImageCropViewController,
    didCropImage croppedImage: UIImage,
    usingCropRect cropRect: CGRect,
    rotationAngle: CGFloat
    ) {
    self.delegate?.didCropWith(image: croppedImage)
    self.imageCropper.dismiss(animated: true, completion: nil)
  }
}

extension ImageCroper: RSKImageCropViewControllerDataSource {
  
  func imageCropViewControllerCustomMaskRect(_ controller: RSKImageCropViewController) -> CGRect {
    guard let viewController = presentingViewController else {return CGRect.zero}
    
    var maskSize:CGSize
    let heightRatio: CGFloat = self.cropRatio //35/71
    
    let maskWidth:CGFloat = UIScreen.main.bounds.size.width - 40
    
    let maskHeight: CGFloat = CGFloat( ceilf( Float(maskWidth * heightRatio)))
    
    maskSize = CGSize(width: maskWidth, height: maskHeight)
    
    let maskRect = CGRect(
      x: (viewController.view.frame.size.width - maskSize.width ) * 0.5,
      y: (viewController.view.frame.size.height - maskSize.height) * 0.5,
      width: maskSize.width,
      height: maskSize.height
    )
    
    return maskRect
  }
  
  func imageCropViewControllerCustomMaskPath(_ controller: RSKImageCropViewController) -> UIBezierPath {
    let rect = controller.maskRect
    
    let point1 = CGPoint(x: rect.minX,y: rect.minY)
    let point2 = CGPoint(x: rect.maxX, y: rect.minY)
    let point3 = CGPoint(x: rect.maxX, y: rect.maxY)
    let point4 = CGPoint(x: rect.minX, y: rect.maxY)
    
    let rectangle = UIBezierPath()
    
    rectangle.move(to: point1)
    rectangle.addLine(to: point2)
    rectangle.addLine(to: point3)
    rectangle.addLine(to: point4)
    rectangle.close()
    
    return rectangle
  }
  
  func imageCropViewControllerCustomMovementRect(_ controller: RSKImageCropViewController) -> CGRect {
    return controller.maskRect
  }
}