//
//  ImageManager.m
//
//  Created by Ivan Pusic on 5/4/16.
//  Copyright © 2016 Facebook. All rights reserved.
//

#import "ImageCropPicker.h"

#define ERROR_PICKER_CANNOT_RUN_CAMERA_ON_SIMULATOR_KEY @"E_PICKER_CANNOT_RUN_CAMERA_ON_SIMULATOR"
#define ERROR_PICKER_CANNOT_RUN_CAMERA_ON_SIMULATOR_MSG @"Cannot run camera on simulator"

#define ERROR_PICKER_NO_CAMERA_PERMISSION_KEY @"E_PICKER_NO_CAMERA_PERMISSION"
#define ERROR_PICKER_NO_CAMERA_PERMISSION_MSG @"User did not grant camera permission."

#define ERROR_PICKER_UNAUTHORIZED_KEY @"ERROR_PICKER_UNAUTHORIZED_KEY"
#define ERROR_PICKER_UNAUTHORIZED_MSG @"Cannot access images. Please allow access if you want to be able to select images."

#define ERROR_PICKER_CANCEL_KEY @"E_PICKER_CANCELLED"
#define ERROR_PICKER_CANCEL_MSG @"User cancelled image selection"

#define ERROR_PICKER_NO_DATA_KEY @"ERROR_PICKER_NO_DATA"
#define ERROR_PICKER_NO_DATA_MSG @"Cannot find image data"

#define ERROR_CROPPER_IMAGE_NOT_FOUND_KEY @"ERROR_CROPPER_IMAGE_NOT_FOUND"
#define ERROR_CROPPER_IMAGE_NOT_FOUND_MSG @"Can't find the image at the specified path"

#define ERROR_CLEANUP_ERROR_KEY @"E_ERROR_WHILE_CLEANING_FILES"
#define ERROR_CLEANUP_ERROR_MSG @"Error while cleaning up tmp files"

#define ERROR_CANNOT_SAVE_IMAGE_KEY @"E_CANNOT_SAVE_IMAGE"
#define ERROR_CANNOT_SAVE_IMAGE_MSG @"Cannot save image. Unable to write to tmp location."

#define ERROR_CANNOT_PROCESS_VIDEO_KEY @"E_CANNOT_PROCESS_VIDEO"
#define ERROR_CANNOT_PROCESS_VIDEO_MSG @"Cannot process video data"

@implementation ImageResult
@end

@implementation ImageCropPicker

RCT_EXPORT_MODULE();

@synthesize bridge = _bridge;

- (instancetype)init
{
    if (self = [super init]) {
        self.defaultOptions = @{
                                @"multiple": @NO,
                                @"cropping": @NO,
                                @"cropperCircleOverlay": @NO,
                                @"includeBase64": @NO,
                                @"compressVideo": @YES,
                                @"maxFiles": @5,
                                @"width": @200,
                                @"waitAnimationEnd": @YES,
                                @"height": @200,
                                @"useFrontCamera": @NO,
                                @"compressImageQuality": @1,
                                @"compressVideoPreset": @"MediumQuality",
                                @"loadingLabelText": @"Processing assets...",
                                };
        self.compression = [[Compression alloc] init];
    }

    return self;
}

- (void (^ __nullable)(void))waitAnimationEnd:(void (^ __nullable)(void))completion {
    if ([[self.options objectForKey:@"waitAnimationEnd"] boolValue]) {
        return completion;
    }
    
    if (completion != nil) {
        completion();
    }
    
    return nil;
}

- (void)checkCameraPermissions:(void(^)(BOOL granted))callback
{
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if (status == AVAuthorizationStatusAuthorized) {
        callback(YES);
        return;
    } else if (status == AVAuthorizationStatusNotDetermined){
        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
            callback(granted);
            return;
        }];
    } else {
        callback(NO);
    }
}

- (void) setConfiguration:(NSDictionary *)options
                 resolver:(RCTPromiseResolveBlock)resolve
                 rejecter:(RCTPromiseRejectBlock)reject {

    self.resolve = resolve;
    self.reject = reject;
    self.options = [NSMutableDictionary dictionaryWithDictionary:self.defaultOptions];
    for (NSString *key in options.keyEnumerator) {
        [self.options setValue:options[key] forKey:key];
    }
}

- (UIViewController*) getRootVC {
    UIViewController *root = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
    while (root.presentedViewController != nil) {
        root = root.presentedViewController;
    }

    return root;
}

RCT_EXPORT_METHOD(openCamera:(NSDictionary *)options
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {

    [self setConfiguration:options resolver:resolve rejecter:reject];
    self.cropOnly = NO;

#if TARGET_IPHONE_SIMULATOR
    self.reject(ERROR_PICKER_CANNOT_RUN_CAMERA_ON_SIMULATOR_KEY, ERROR_PICKER_CANNOT_RUN_CAMERA_ON_SIMULATOR_MSG, nil);
    return;
#else
    [self checkCameraPermissions:^(BOOL granted) {
        if (!granted) {
            self.reject(ERROR_PICKER_NO_CAMERA_PERMISSION_KEY, ERROR_PICKER_NO_CAMERA_PERMISSION_MSG, nil);
            return;
        }

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsEditing = NO;
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        if ([[self.options objectForKey:@"useFrontCamera"] boolValue]) {
            picker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
        }

        dispatch_async(dispatch_get_main_queue(), ^{
            [[self getRootVC] presentViewController:picker animated:YES completion:nil];
        });
    }];
#endif
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *chosenImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    [self processSingleImagePick:chosenImage withViewController:picker];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
        self.reject(ERROR_PICKER_CANCEL_KEY, ERROR_PICKER_CANCEL_MSG, nil);
    }]];
}

- (NSString*) getTmpDirectory {
    NSString *TMP_DIRECTORY = @"react-native-image-crop-picker/";
    NSString *tmpFullPath = [NSTemporaryDirectory() stringByAppendingString:TMP_DIRECTORY];

    BOOL isDir;
    BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:tmpFullPath isDirectory:&isDir];
    if (!exists) {
        [[NSFileManager defaultManager] createDirectoryAtPath: tmpFullPath
                                  withIntermediateDirectories:YES attributes:nil error:nil];
    }

    return tmpFullPath;
}

- (BOOL)cleanTmpDirectory {
    NSString* tmpDirectoryPath = [self getTmpDirectory];
    NSArray* tmpDirectory = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:tmpDirectoryPath error:NULL];

    for (NSString *file in tmpDirectory) {
        BOOL deleted = [[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:@"%@%@", tmpDirectoryPath, file] error:NULL];

        if (!deleted) {
            return NO;
        }
    }

    return YES;
}

RCT_EXPORT_METHOD(cleanSingle:(NSString *) path
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {

    BOOL deleted = [[NSFileManager defaultManager] removeItemAtPath:path error:NULL];

    if (!deleted) {
        reject(ERROR_CLEANUP_ERROR_KEY, ERROR_CLEANUP_ERROR_MSG, nil);
    } else {
        resolve(nil);
    }
}

RCT_REMAP_METHOD(clean, resolver:(RCTPromiseResolveBlock)resolve
                 rejecter:(RCTPromiseRejectBlock)reject) {
    if (![self cleanTmpDirectory]) {
        reject(ERROR_CLEANUP_ERROR_KEY, ERROR_CLEANUP_ERROR_MSG, nil);
    } else {
        resolve(nil);
    }
}

RCT_EXPORT_METHOD(openPicker:(NSDictionary *)options
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {

    [self setConfiguration:options resolver:resolve rejecter:reject];
    self.cropOnly = NO;
    
    [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
        if (status != PHAuthorizationStatusAuthorized) {
            self.reject(ERROR_PICKER_UNAUTHORIZED_KEY, ERROR_PICKER_UNAUTHORIZED_MSG, nil);
            return;
        }
        
        dispatch_async(dispatch_get_main_queue(), ^{
            // init picker
            QBImagePickerController *imagePickerController =
            [QBImagePickerController new];
            imagePickerController.delegate = self;
            imagePickerController.allowsMultipleSelection = [[self.options objectForKey:@"multiple"] boolValue];
            imagePickerController.maximumNumberOfSelection = [[self.options objectForKey:@"maxFiles"] intValue];
            imagePickerController.showsNumberOfSelectedAssets = YES;

            if ([self.options objectForKey:@"smartAlbums"] != nil) {
                NSDictionary *smartAlbums = @{
                                          @"UserLibrary" : @(PHAssetCollectionSubtypeSmartAlbumUserLibrary),
                                          @"PhotoStream" : @(PHAssetCollectionSubtypeAlbumMyPhotoStream),
                                          @"Panoramas" : @(PHAssetCollectionSubtypeSmartAlbumPanoramas),
                                          @"Videos" : @(PHAssetCollectionSubtypeSmartAlbumVideos),
                                          @"Bursts" : @(PHAssetCollectionSubtypeSmartAlbumBursts),
                                          };
                NSMutableArray *albumsToShow = [NSMutableArray arrayWithCapacity:5];
                for (NSString* album in [self.options objectForKey:@"smartAlbums"]) {
                    if ([smartAlbums objectForKey:album] != nil) {
                        [albumsToShow addObject:[smartAlbums objectForKey:album]];
                    }
                }
                imagePickerController.assetCollectionSubtypes = albumsToShow;
            }

            if ([[self.options objectForKey:@"cropping"] boolValue]) {
                imagePickerController.mediaType = QBImagePickerMediaTypeImage;
            } else {
                imagePickerController.mediaType = QBImagePickerMediaTypeAny;
            }

            [[self getRootVC] presentViewController:imagePickerController animated:YES completion:nil];
        });
    }];
}

RCT_EXPORT_METHOD(openCropper:(NSDictionary *)options
                  resolver:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {

    [self setConfiguration:options resolver:resolve rejecter:reject];
    self.cropOnly = YES;

    NSString *path = [options objectForKey:@"path"];
    NSURL *url = [NSURL URLWithString:path];

    [self.bridge.imageLoader loadImageWithURLRequest:[RCTConvert NSURLRequest:path] callback:^(NSError *error, UIImage *image) {
        if (error) {
            self.reject(ERROR_CROPPER_IMAGE_NOT_FOUND_KEY, ERROR_CROPPER_IMAGE_NOT_FOUND_MSG, nil);
        } else {
            [self startCropping:image];
        }
    }];
}

- (void)startCropping:(UIImage *)image {
    RSKImageCropViewController *imageCropVC = [[RSKImageCropViewController alloc] initWithImage:image];
    if ([[[self options] objectForKey:@"cropperCircleOverlay"] boolValue]) {
        imageCropVC.cropMode = RSKImageCropModeCircle;
    } else {
        imageCropVC.cropMode = RSKImageCropModeCustom;
    }
    imageCropVC.avoidEmptySpaceAroundImage = YES;
    imageCropVC.dataSource = self;
    imageCropVC.delegate = self;
    [imageCropVC setModalPresentationStyle:UIModalPresentationCustom];
    [imageCropVC setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];

    dispatch_async(dispatch_get_main_queue(), ^{
        [[self getRootVC] presentViewController:imageCropVC animated:YES completion:nil];
    });
}

- (void)showActivityIndicator:(void (^)(UIActivityIndicatorView*, UIView*))handler {
    dispatch_async(dispatch_get_main_queue(), ^{
        UIView *mainView = [[self getRootVC] view];

        // create overlay
        UIView *loadingView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
        loadingView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
        loadingView.clipsToBounds = YES;

        // create loading spinner
        UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
        activityView.frame = CGRectMake(65, 40, activityView.bounds.size.width, activityView.bounds.size.height);
        activityView.center = loadingView.center;
        [loadingView addSubview:activityView];

        // create message
        UILabel *loadingLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 115, 130, 22)];
        loadingLabel.backgroundColor = [UIColor clearColor];
        loadingLabel.textColor = [UIColor whiteColor];
        loadingLabel.adjustsFontSizeToFitWidth = YES;
        CGPoint loadingLabelLocation = loadingView.center;
        loadingLabelLocation.y += [activityView bounds].size.height;
        loadingLabel.center = loadingLabelLocation;
        loadingLabel.textAlignment = UITextAlignmentCenter;
        loadingLabel.text = [self.options objectForKey:@"loadingLabelText"];
        [loadingLabel setFont:[UIFont boldSystemFontOfSize:18]];
        [loadingView addSubview:loadingLabel];

        // show all
        [mainView addSubview:loadingView];
        [activityView startAnimating];

        handler(activityView, loadingView);
    });
}


- (void) getVideoAsset:(PHAsset*)forAsset completion:(void (^)(NSDictionary* image))completion {
    PHImageManager *manager = [PHImageManager defaultManager];
    PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
    options.version = PHVideoRequestOptionsVersionOriginal;

    [manager
     requestAVAssetForVideo:forAsset
     options:options
     resultHandler:^(AVAsset * asset, AVAudioMix * audioMix,
                     NSDictionary *info) {
         NSURL *sourceURL = [(AVURLAsset *)asset URL];

         // create temp file
         NSString *tmpDirFullPath = [self getTmpDirectory];
         NSString *filePath = [tmpDirFullPath stringByAppendingString:[[NSUUID UUID] UUIDString]];
         filePath = [filePath stringByAppendingString:@".mp4"];
         NSURL *outputURL = [NSURL fileURLWithPath:filePath];

         [self.compression compressVideo:sourceURL outputURL:outputURL withOptions:self.options handler:^(AVAssetExportSession *exportSession) {
             if (exportSession.status == AVAssetExportSessionStatusCompleted) {
                 AVAsset *compressedAsset = [AVAsset assetWithURL:outputURL];
                 AVAssetTrack *track = [[compressedAsset tracksWithMediaType:AVMediaTypeVideo] firstObject];
                 
                 NSNumber *fileSizeValue = nil;
                 [outputURL getResourceValue:&fileSizeValue
                                      forKey:NSURLFileSizeKey
                                       error:nil];

                 completion([self createAttachmentResponse:[outputURL absoluteString]
                                                 withWidth:[NSNumber numberWithFloat:track.naturalSize.width]
                                                withHeight:[NSNumber numberWithFloat:track.naturalSize.height]
                                                  withMime:@"video/mp4"
                                                  withSize:fileSizeValue
                                                  withData:[NSNull null]]);
             } else {
                 completion(nil);
             }
         }];
     }];
}

- (NSDictionary*) createAttachmentResponse:(NSString*)filePath withWidth:(NSNumber*)width withHeight:(NSNumber*)height withMime:(NSString*)mime withSize:(NSNumber*)size withData:(NSString*)data {
    return @{
             @"path": filePath,
             @"width": width,
             @"height": height,
             @"mime": mime,
             @"size": size,
             @"data": data,
             };
}

- (void)qb_imagePickerController:
(QBImagePickerController *)imagePickerController
          didFinishPickingAssets:(NSArray *)assets {

    PHImageManager *manager = [PHImageManager defaultManager];
    PHImageRequestOptions* options = [[PHImageRequestOptions alloc] init];
    options.synchronous = NO;
    options.networkAccessAllowed = YES;

    if ([[[self options] objectForKey:@"multiple"] boolValue]) {
        NSMutableArray *selections = [[NSMutableArray alloc] init];

        [self showActivityIndicator:^(UIActivityIndicatorView *indicatorView, UIView *overlayView) {
            NSLock *lock = [[NSLock alloc] init];
            __block int processed = 0;

            for (PHAsset *phAsset in assets) {

                if (phAsset.mediaType == PHAssetMediaTypeVideo) {
                    [self getVideoAsset:phAsset completion:^(NSDictionary* video) {
                        dispatch_async(dispatch_get_main_queue(), ^{
                            [lock lock];
                            
                            if (video == nil) {
                                [indicatorView stopAnimating];
                                [overlayView removeFromSuperview];
                                [imagePickerController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
                                    self.reject(ERROR_CANNOT_PROCESS_VIDEO_KEY, ERROR_CANNOT_PROCESS_VIDEO_MSG, nil);
                                }]];
                                return;
                            }
                            
                            [selections addObject:video];
                            processed++;
                            [lock unlock];

                            if (processed == [assets count]) {
                                [indicatorView stopAnimating];
                                [overlayView removeFromSuperview];
                                [imagePickerController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
                                    self.resolve(selections);
                                }]];
                                return;
                            }
                        });
                    }];
                } else {
                    [manager
                     requestImageDataForAsset:phAsset
                     options:options
                     resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {

                         dispatch_async(dispatch_get_main_queue(), ^{
                             [lock lock];
                             
                             ImageResult *imageResult = [self.compression compressImage:[UIImage imageWithData:imageData] withOptions:self.options];
                             NSString *filePath = [self persistFile:imageResult.data];
                             
                             if (filePath == nil) {
                                 [indicatorView stopAnimating];
                                 [overlayView removeFromSuperview];
                                 [imagePickerController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
                                     self.reject(ERROR_CANNOT_SAVE_IMAGE_KEY, ERROR_CANNOT_SAVE_IMAGE_MSG, nil);
                                 }]];
                                 return;
                             }

                             [selections addObject:[self createAttachmentResponse:filePath
                                                                        withWidth:imageResult.width
                                                                       withHeight:imageResult.height
                                                                         withMime:imageResult.mime
                                                                         withSize:[NSNumber numberWithUnsignedInteger:imageResult.data.length]
                                                                         withData:[[self.options objectForKey:@"includeBase64"] boolValue] ? [imageResult.data base64EncodedStringWithOptions:0] : [NSNull null]
                                                    ]];
                             processed++;
                             [lock unlock];

                             if (processed == [assets count]) {

                                 [indicatorView stopAnimating];
                                 [overlayView removeFromSuperview];
                                 [imagePickerController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
                                     self.resolve(selections);
                                 }]];
                                 return;
                             }
                         });
                     }];
                }
            }
        }];
    } else {
        PHAsset *phAsset = [assets objectAtIndex:0];

        [self showActivityIndicator:^(UIActivityIndicatorView *indicatorView, UIView *overlayView) {
            if (phAsset.mediaType == PHAssetMediaTypeVideo) {
                [self getVideoAsset:phAsset completion:^(NSDictionary* video) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        [indicatorView stopAnimating];
                        [overlayView removeFromSuperview];
                        [imagePickerController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
                            if (video != nil) {
                                self.resolve(video);
                            } else {
                                self.reject(ERROR_CANNOT_PROCESS_VIDEO_KEY, ERROR_CANNOT_PROCESS_VIDEO_MSG, nil);
                            }
                        }]];
                    });
                }];
            } else {
                [manager
                 requestImageDataForAsset:phAsset
                 options:options
                 resultHandler:^(NSData *imageData, NSString *dataUTI,
                                 UIImageOrientation orientation,
                                 NSDictionary *info) {
                     dispatch_async(dispatch_get_main_queue(), ^{
                         [indicatorView stopAnimating];
                         [overlayView removeFromSuperview];
                         [self processSingleImagePick:[UIImage imageWithData:imageData] withViewController:imagePickerController];
                     });
                 }];
            }
        }];
    }
}

- (void)qb_imagePickerControllerDidCancel:(QBImagePickerController *)imagePickerController {
    [imagePickerController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
        self.reject(ERROR_PICKER_CANCEL_KEY, ERROR_PICKER_CANCEL_MSG, nil);
    }]];
}

// when user selected single image, with camera or from photo gallery,
// this method will take care of attaching image metadata, and sending image to cropping controller
// or to user directly
- (void) processSingleImagePick:(UIImage*)image withViewController:(UIViewController*)viewController {

    if (image == nil) {
        [viewController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
            self.reject(ERROR_PICKER_NO_DATA_KEY, ERROR_PICKER_NO_DATA_MSG, nil);
        }]];
        return;
    }

    if ([[[self options] objectForKey:@"cropping"] boolValue]) {
        [self startCropping:image];
    } else {
        ImageResult *imageResult = [self.compression compressImage:image withOptions:self.options];
        NSString *filePath = [self persistFile:imageResult.data];
        if (filePath == nil) {
            [viewController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
                self.reject(ERROR_CANNOT_SAVE_IMAGE_KEY, ERROR_CANNOT_SAVE_IMAGE_MSG, nil);
            }]];
            return;
        }
        
        // Wait for viewController to dismiss before resolving, or we lose the ability to display
        // Alert.alert in the .then() handler.
        [viewController dismissViewControllerAnimated:YES completion:[self waitAnimationEnd:^{
            self.resolve([self createAttachmentResponse:filePath
                                              withWidth:imageResult.width
                                             withHeight:imageResult.height
                                               withMime:imageResult.mime
                                               withSize:[NSNumber numberWithUnsignedInteger:imageResult.data.length]
                                               withData:[[self.options objectForKey:@"includeBase64"] boolValue] ? [imageResult.data base64EncodedStringWithOptions:0] : [NSNull null]]);
        }]];
    }
}

#pragma mark - CustomCropModeDelegates

// Returns a custom rect for the mask.
- (CGRect)imageCropViewControllerCustomMaskRect:
(RSKImageCropViewController *)controller {
    CGSize maskSize = CGSizeMake(
                                 [[self.options objectForKey:@"width"] intValue],
                                 [[self.options objectForKey:@"height"] intValue]);

    CGFloat viewWidth = CGRectGetWidth(controller.view.frame);
    CGFloat viewHeight = CGRectGetHeight(controller.view.frame);

    CGRect maskRect = CGRectMake((viewWidth - maskSize.width) * 0.5f,
                                 (viewHeight - maskSize.height) * 0.5f,
                                 maskSize.width, maskSize.height);

    return maskRect;
}

// if provided width or height is bigger than screen w/h,
// then we should scale draw area
- (CGRect) scaleRect:(RSKImageCropViewController *)controller {
    CGRect rect = controller.maskRect;
    CGFloat viewWidth = CGRectGetWidth(controller.view.frame);
    CGFloat viewHeight = CGRectGetHeight(controller.view.frame);

    double scaleFactor = fmin(viewWidth / rect.size.width, viewHeight / rect.size.height);
    rect.size.width *= scaleFactor;
    rect.size.height *= scaleFactor;
    rect.origin.x = (viewWidth - rect.size.width) / 2;
    rect.origin.y = (viewHeight - rect.size.height) / 2;

    return rect;
}

// Returns a custom path for the mask.
- (UIBezierPath *)imageCropViewControllerCustomMaskPath:
(RSKImageCropViewController *)controller {
    CGRect rect = [self scaleRect:controller];
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect
                                               byRoundingCorners:UIRectCornerAllCorners
                                                     cornerRadii:CGSizeMake(0, 0)];
    return path;
}

// Returns a custom rect in which the image can be moved.
- (CGRect)imageCropViewControllerCustomMovementRect:
(RSKImageCropViewController *)controller {
    return [self scaleRect:controller];
}

#pragma mark - CropFinishDelegate

// Crop image has been canceled.
- (void)imageCropViewControllerDidCancelCrop:
(RSKImageCropViewController *)controller {
    [self dismissCropper:controller completion:[self waitAnimationEnd:^{
        self.reject(ERROR_PICKER_CANCEL_KEY, ERROR_PICKER_CANCEL_MSG, nil);
    }]];
}

- (void) dismissCropper:(RSKImageCropViewController*) controller completion:(void (^)())completion {
    //We've presented the cropper on top of the image picker as to not have a double modal animation.
    //Thus, we need to dismiss the image picker view controller to dismiss the whole stack.
    if (!self.cropOnly) {
        UIViewController *topViewController = controller.presentingViewController.presentingViewController;
        [topViewController dismissViewControllerAnimated:YES completion:completion];
    } else {
        [controller dismissViewControllerAnimated:YES completion:completion];
    }
}

// The original image has been cropped.
- (void)imageCropViewController:(RSKImageCropViewController *)controller
                   didCropImage:(UIImage *)croppedImage
                  usingCropRect:(CGRect)cropRect {

    // we have correct rect, but not correct dimensions
    // so resize image
    CGSize resizedImageSize = CGSizeMake([[[self options] objectForKey:@"width"] intValue], [[[self options] objectForKey:@"height"] intValue]);
    UIImage *resizedImage = [croppedImage resizedImageToFitInSize:resizedImageSize scaleIfSmaller:YES];
    ImageResult *imageResult = [self.compression compressImage:resizedImage withOptions:self.options];

    NSString *filePath = [self persistFile:imageResult.data];
    if (filePath == nil) {
        [self dismissCropper:controller completion:[self waitAnimationEnd:^{
            self.reject(ERROR_CANNOT_SAVE_IMAGE_KEY, ERROR_CANNOT_SAVE_IMAGE_MSG, nil);
        }]];
        return;
    }

    [self dismissCropper:controller completion:[self waitAnimationEnd:^{
        self.resolve([self createAttachmentResponse:filePath
                                          withWidth:imageResult.width
                                         withHeight:imageResult.height
                                           withMime:imageResult.mime
                                           withSize:[NSNumber numberWithUnsignedInteger:imageResult.data.length]
                                           withData:[[self.options objectForKey:@"includeBase64"] boolValue] ? [imageResult.data base64EncodedStringWithOptions:0] : [NSNull null]]);
    }]];
}

// at the moment it is not possible to upload image by reading PHAsset
// we are saving image and saving it to the tmp location where we are allowed to access image later
- (NSString*) persistFile:(NSData*)data {
    // create temp file
    NSString *tmpDirFullPath = [self getTmpDirectory];
    NSString *filePath = [tmpDirFullPath stringByAppendingString:[[NSUUID UUID] UUIDString]];
    filePath = [filePath stringByAppendingString:@".jpg"];

    // save cropped file
    BOOL status = [data writeToFile:filePath atomically:YES];
    if (!status) {
        return nil;
    }

    return filePath;
}

// The original image has been cropped. Additionally provides a rotation angle
// used to produce image.
- (void)imageCropViewController:(RSKImageCropViewController *)controller
                   didCropImage:(UIImage *)croppedImage
                  usingCropRect:(CGRect)cropRect
                  rotationAngle:(CGFloat)rotationAngle {
    [self imageCropViewController:controller didCropImage:croppedImage usingCropRect:cropRect];
}

@end