#import "FLTImageCropperPlugin.h"
#import <TOCropViewController/TOCropViewController.h>
#import <UIKit/UIKit.h>
#import <MobileCoreServices/MobileCoreServices.h>
#import <Photos/Photos.h>

@interface FLTImageCropperPlugin() <TOCropViewControllerDelegate>
@end

@implementation FLTImageCropperPlugin {
    FlutterResult _result;
    NSDictionary *_arguments;
    UIViewController *_viewController;
    float _compressQuality;
    NSString *_compressFormat;
}
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
    FlutterMethodChannel* channel = [FlutterMethodChannel
      methodChannelWithName:@"plugins.hunghd.vn/image_cropper"
            binaryMessenger:[registrar messenger]];
    UIViewController *viewController = [UIApplication sharedApplication].delegate.window.rootViewController;
    FLTImageCropperPlugin* instance = [[FLTImageCropperPlugin alloc] initWithViewController:viewController];
    [registrar addMethodCallDelegate:instance channel:channel];
}

- (instancetype)initWithViewController:(UIViewController *)viewController {
    self = [super init];
    if (self) {
        _viewController = viewController;
    }
    return self;
}

- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
  if ([@"cropImage" isEqualToString:call.method]) {
      _result = result;
      _arguments = call.arguments;
      NSString *sourcePath = call.arguments[@"source_path"];
      NSNumber *ratioX = call.arguments[@"ratio_x"];
      NSNumber *ratioY = call.arguments[@"ratio_y"];
      NSString *cropStyle = call.arguments[@"crop_style"];
      NSArray *aspectRatioPresets = call.arguments[@"aspect_ratio_presets"];
      NSNumber *compressQuality = call.arguments[@"compress_quality"];
      NSString *compressFormat = call.arguments[@"compress_format"];
      
      UIImage *image = [UIImage imageWithContentsOfFile:sourcePath];
      TOCropViewController *cropViewController;
      
      if ([@"circle" isEqualToString:cropStyle]) {
        cropViewController = [[TOCropViewController alloc] initWithCroppingStyle:TOCropViewCroppingStyleCircular image:image];
      } else {
        cropViewController = [[TOCropViewController alloc] initWithImage:image];
      }
      
      cropViewController.delegate = self;
      
      if (compressQuality && [compressQuality isKindOfClass:[NSNumber class]]) {
          _compressQuality = compressQuality.intValue * 1.0f / 100;
      } else {
          _compressQuality = 0.9f;
      }
      if (compressFormat && [compressFormat isKindOfClass:[NSString class]]) {
          _compressFormat = compressFormat;
      } else {
          _compressFormat = @"jpg";
      }
      
      NSMutableArray *allowedAspectRatios = [NSMutableArray new];
      for (NSString *preset in aspectRatioPresets) {
          if (preset) {
              [allowedAspectRatios addObject:@([self parseAspectRatioPresetFromName:preset])];
          }
      }
      cropViewController.allowedAspectRatios = allowedAspectRatios;
      
      if (ratioX != (id)[NSNull null] && ratioY != (id)[NSNull null]) {
          cropViewController.customAspectRatio = CGSizeMake([ratioX floatValue], [ratioY floatValue]);
          cropViewController.resetAspectRatioEnabled = NO;
          cropViewController.aspectRatioPickerButtonHidden = YES;
          cropViewController.aspectRatioLockDimensionSwapEnabled = YES;
          cropViewController.aspectRatioLockEnabled = YES;
      }
      
      [self setupUiCustomizedOptions:call.arguments forViewController:cropViewController];

      UIWindow *window = [UIApplication sharedApplication].delegate.window;
      if (!window && @available(iOS 13.0, *)) {
          for (UIWindowScene* scene in [UIApplication sharedApplication].connectedScenes) {
              if (scene.activationState == UISceneActivationStateForegroundActive) {
                  for (UIWindow *w in scene.windows) {
                      if (w.isKeyWindow) {
                          window = w;
                          break;
                      }
                  }
              }
          }
      }

      [window.rootViewController presentViewController:cropViewController animated:YES completion:nil];
  } else {
      result(FlutterMethodNotImplemented);
  }
}

- (void)setupUiCustomizedOptions:(id)options forViewController:(TOCropViewController*)controller {
    NSNumber *minimumAspectRatio = options[@"ios.minimum_aspect_ratio"];
    NSNumber *rectX = options[@"ios.rect_x"];
    NSNumber *rectY = options[@"ios.rect_y"];
    NSNumber *rectWidth = options[@"ios.rect_width"];
    NSNumber *rectHeight = options[@"ios.rect_height"];
    NSNumber *showActivitySheetOnDone = options[@"ios.show_activity_sheet_on_done"];
    NSNumber *showCancelConfirmationDialog = options[@"ios.show_cancel_confirmation_dialog"];
    NSNumber *rotateClockwiseButtonHidden = options[@"ios.rotate_clockwise_button_hidden"];
    NSNumber *hidesNavigationBar = options[@"ios.hides_navigation_bar"];
    NSNumber *rotateButtonHidden = options[@"ios.rotate_button_hidden"];
    NSNumber *resetButtonHidden = options[@"ios.reset_button_hidden"];
    NSNumber *aspectRatioPickerButtonHidden = options[@"ios.aspect_ratio_picker_button_hidden"];
    NSNumber *resetAspectRatioEnabled = options[@"ios.reset_aspect_ratio_enabled"];
    NSNumber *aspectRatioLockDimensionSwapEnabled = options[@"ios.aspect_ratio_lock_dimension_swap_enabled"];
    NSNumber *aspectRatioLockEnabled = options[@"ios.aspect_ratio_lock_enabled"];
    NSString *title = options[@"ios.title"];
    NSString *doneButtonTitle = options[@"ios.done_button_title"];
    NSString *cancelButtonTitle = options[@"ios.cancel_button_title"];
    
    if (minimumAspectRatio && [minimumAspectRatio isKindOfClass:[NSNumber class]]) {
        controller.minimumAspectRatio = minimumAspectRatio.floatValue;
    }
    if (rectX && [rectX isKindOfClass:[NSNumber class]]
        && rectY && [rectY isKindOfClass:[NSNumber class]]
        && rectWidth && [rectWidth isKindOfClass:[NSNumber class]]
        && rectHeight && [rectHeight isKindOfClass:[NSNumber class]]) {
        controller.imageCropFrame = CGRectMake(rectX.floatValue, rectY.floatValue, rectWidth.floatValue, rectHeight.floatValue);
    }
    if (showActivitySheetOnDone && [showActivitySheetOnDone isKindOfClass:[NSNumber class]]) {
        controller.showActivitySheetOnDone = showActivitySheetOnDone.boolValue;
    }
    if (showCancelConfirmationDialog && [showCancelConfirmationDialog isKindOfClass:[NSNumber class]]) {
        controller.showCancelConfirmationDialog = showCancelConfirmationDialog.boolValue;
    }
    if (rotateClockwiseButtonHidden && [rotateClockwiseButtonHidden isKindOfClass:[NSNumber class]]) {
        controller.rotateClockwiseButtonHidden = rotateClockwiseButtonHidden.boolValue;
    }
    if (hidesNavigationBar && [hidesNavigationBar isKindOfClass:[NSNumber class]]) {
        controller.hidesNavigationBar = hidesNavigationBar.boolValue;
    }
    if (rotateButtonHidden && [rotateButtonHidden isKindOfClass:[NSNumber class]]) {
        controller.rotateButtonsHidden = rotateButtonHidden.boolValue;
    }
    if (resetButtonHidden && [resetButtonHidden isKindOfClass:[NSNumber class]]) {
        controller.resetButtonHidden = resetButtonHidden.boolValue;
    }
    if (aspectRatioPickerButtonHidden && [aspectRatioPickerButtonHidden isKindOfClass:[NSNumber class]]) {
        controller.aspectRatioPickerButtonHidden = aspectRatioPickerButtonHidden.boolValue;
    }
    if (resetAspectRatioEnabled && [resetAspectRatioEnabled isKindOfClass:[NSNumber class]]) {
        controller.resetAspectRatioEnabled = resetAspectRatioEnabled.boolValue;
    }
    if (aspectRatioLockDimensionSwapEnabled && [aspectRatioLockDimensionSwapEnabled isKindOfClass:[NSNumber class]]) {
        controller.aspectRatioLockDimensionSwapEnabled = aspectRatioLockDimensionSwapEnabled.boolValue;
    }
    if (aspectRatioLockEnabled && [aspectRatioLockEnabled isKindOfClass:[NSNumber class]]) {
        controller.aspectRatioLockEnabled = aspectRatioLockEnabled.boolValue;
    }
    if (title && [title isKindOfClass:[NSString class]]) {
        controller.title = title;
    }
    if (doneButtonTitle && [doneButtonTitle isKindOfClass:[NSString class]]) {
        controller.doneButtonTitle = doneButtonTitle;
    }
    if (cancelButtonTitle && [cancelButtonTitle isKindOfClass:[NSString class]]) {
        controller.cancelButtonTitle = cancelButtonTitle;
    }
}

- (TOCropViewControllerAspectRatioPreset)parseAspectRatioPresetFromName:(NSString*)name {
    if ([@"square" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPresetSquare;
    } else if ([@"original" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPresetOriginal;
    } else if ([@"3x2" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPreset3x2;
    } else if ([@"4x3" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPreset4x3;
    } else if ([@"5x3" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPreset5x3;
    } else if ([@"5x4" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPreset5x4;
    } else if ([@"7x5" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPreset7x5;
    } else if ([@"16x9" isEqualToString:name]) {
        return TOCropViewControllerAspectRatioPreset16x9;
    } else {
        return TOCropViewControllerAspectRatioPresetOriginal;
    }
}

# pragma TOCropViewControllerDelegate

- (void)cropViewController:(TOCropViewController *)cropViewController didCropToImage:(UIImage *)image withRect:(CGRect)cropRect angle:(NSInteger)angle
{
    image = [self normalizedImage:image];
    
    NSNumber *maxWidth = [_arguments objectForKey:@"max_width"];
    NSNumber *maxHeight = [_arguments objectForKey:@"max_height"];
    
    if (maxWidth != (id)[NSNull null] && maxHeight != (id)[NSNull null]) {
        image = [self scaledImage:image maxWidth:maxWidth maxHeight:maxHeight];
    }
    
    NSString *guid = [[NSProcessInfo processInfo] globallyUniqueString];
    
    NSData *data;
    NSString *tmpFile;
    
    if ([@"png" isEqualToString:_compressFormat]) {
        data = UIImagePNGRepresentation(image);
        tmpFile = [NSString stringWithFormat:@"image_cropper_%@.png", guid];
    } else {
        data = UIImageJPEGRepresentation(image, _compressQuality);
        tmpFile = [NSString stringWithFormat:@"image_cropper_%@.jpg", guid];
    }
    
    NSString *tmpDirectory = NSTemporaryDirectory();
    NSString *tmpPath = [tmpDirectory stringByAppendingPathComponent:tmpFile];
    
    if (_result) {
        if ([[NSFileManager defaultManager] createFileAtPath:tmpPath contents:data attributes:nil]) {
            _result(tmpPath);
        } else {
            _result([FlutterError errorWithCode:@"create_error"
                                        message:@"Temporary file could not be created"
                                        details:nil]);
        }
        
        [cropViewController dismissViewControllerAnimated:YES completion:nil];

        _result = nil;
        _arguments = nil;
    }
}

- (void)cropViewController:(TOCropViewController *)cropViewController didFinishCancelled:(BOOL)cancelled {
    [cropViewController dismissViewControllerAnimated:YES completion:nil];
    _result(nil);
    
    _result = nil;
    _arguments = nil;
}

// The way we save images to the tmp dir currently throws away all EXIF data
// (including the orientation of the image). That means, pics taken in portrait
// will not be orientated correctly as is. To avoid that, we rotate the actual
// image data.
// TODO(goderbauer): investigate how to preserve EXIF data.
- (UIImage *)normalizedImage:(UIImage *)image {
    if (image.imageOrientation == UIImageOrientationUp) return image;
    
    UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
    [image drawInRect:(CGRect){0, 0, image.size}];
    UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return normalizedImage;
}

- (UIImage *)scaledImage:(UIImage *)image
                maxWidth:(NSNumber *)maxWidth
               maxHeight:(NSNumber *)maxHeight {
    double originalWidth = image.size.width;
    double originalHeight = image.size.height;
    
    bool hasMaxWidth = maxWidth != (id)[NSNull null];
    bool hasMaxHeight = maxHeight != (id)[NSNull null];
    
    double width = hasMaxWidth ? MIN([maxWidth doubleValue], originalWidth) : originalWidth;
    double height = hasMaxHeight ? MIN([maxHeight doubleValue], originalHeight) : originalHeight;
    
    bool shouldDownscaleWidth = hasMaxWidth && [maxWidth doubleValue] < originalWidth;
    bool shouldDownscaleHeight = hasMaxHeight && [maxHeight doubleValue] < originalHeight;
    bool shouldDownscale = shouldDownscaleWidth || shouldDownscaleHeight;
    
    if (shouldDownscale) {
        double downscaledWidth = (height / originalHeight) * originalWidth;
        double downscaledHeight = (width / originalWidth) * originalHeight;
        
        if (width < height) {
            if (!hasMaxWidth) {
                width = downscaledWidth;
            } else {
                height = downscaledHeight;
            }
        } else if (height < width) {
            if (!hasMaxHeight) {
                height = downscaledHeight;
            } else {
                width = downscaledWidth;
            }
        } else {
            if (originalWidth < originalHeight) {
                width = downscaledWidth;
            } else if (originalHeight < originalWidth) {
                height = downscaledHeight;
            }
        }
    }
    
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(width, height), NO, 1.0);
    [image drawInRect:CGRectMake(0, 0, width, height)];
    
    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return scaledImage;
}

@end