/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RNCImageEditor.h"

#import <UIKit/UIKit.h>

#import <React/RCTConvert.h>
#import <React/RCTLog.h>
#import <React/RCTUtils.h>

#import <React/RCTImageLoader.h>
#import <React/RCTImageStoreManager.h>
#import "RNCFileSystem.h"
#import "RNCImageUtils.h"
#if __has_include(<RCTImage/RCTImageUtils.h>)
#import <RCTImage/RCTImageUtils.h>
#else
#import "RCTImageUtils.h"
#endif

@implementation RNCImageEditor

RCT_EXPORT_MODULE()

@synthesize bridge = _bridge;

/**
 * Crops an image and saves the result to temporary file. Consider using
 * CameraRoll API or other third-party module to save it in gallery.
 *
 * @param imageRequest An image URL
 * @param cropData Dictionary with `offset`, `size` and `displaySize`.
 *        `offset` and `size` are relative to the full-resolution image size.
 *        `displaySize` is an optimization - if specified, the image will
 *        be scaled down to `displaySize` rather than `size`.
 *        All units are in px (not points).
 */
RCT_EXPORT_METHOD(cropImage:(NSURLRequest *)imageRequest
                  cropData:(NSDictionary *)cropData
                  resolve:(RCTPromiseResolveBlock)resolve
                  reject:(RCTPromiseRejectBlock)reject)
{
  CGRect rect = {
    [RCTConvert CGPoint:cropData[@"offset"]],
    [RCTConvert CGSize:cropData[@"size"]]
  };
  NSURL *url = [imageRequest URL];
  NSString *urlPath = [url path];
  NSString *extension = [urlPath pathExtension];

  [[_bridge moduleForName:@"ImageLoader" lazilyLoadIfNecessary:YES] loadImageWithURLRequest:imageRequest callback:^(NSError *error, UIImage *image) {
    if (error) {
      reject(@(error.code).stringValue, error.description, error);
      return;
    }

    // Crop image
    CGSize targetSize = rect.size;
    CGRect targetRect = {{-rect.origin.x, -rect.origin.y}, image.size};
    CGAffineTransform transform = RCTTransformFromTargetRect(image.size, targetRect);
    UIImage *croppedImage = RCTTransformImage(image, targetSize, image.scale, transform);

    // Scale image
    if (cropData[@"displaySize"]) {
      targetSize = [RCTConvert CGSize:cropData[@"displaySize"]]; // in pixels
      RCTResizeMode resizeMode = [RCTConvert RCTResizeMode:cropData[@"resizeMode"] ?: @"contain"];
      targetRect = RCTTargetRect(croppedImage.size, targetSize, 1, resizeMode);
      transform = RCTTransformFromTargetRect(croppedImage.size, targetRect);
      croppedImage = RCTTransformImage(croppedImage, targetSize, image.scale, transform);
    }

    // Store image
    NSString *path = NULL;
    NSData *imageData = NULL;
    
    if([extension isEqualToString:@"png"]){
      imageData = UIImagePNGRepresentation(croppedImage);
      path = [RNCFileSystem generatePathInDirectory:[[RNCFileSystem cacheDirectoryPath] stringByAppendingPathComponent:@"ReactNative_cropped_image_"] withExtension:@".png"];
    }
    else{

      imageData = UIImageJPEGRepresentation(croppedImage, 1);
      path = [RNCFileSystem generatePathInDirectory:[[RNCFileSystem cacheDirectoryPath] stringByAppendingPathComponent:@"ReactNative_cropped_image_"] withExtension:@".jpg"];
    }

    NSError *writeError;
    NSString *uri = [RNCImageUtils writeImage:imageData toPath:path error:&writeError];
      
    if (writeError != nil) {
      reject(@(writeError.code).stringValue, writeError.description, writeError);
      return;
    }
      
    resolve(uri);
  }];
}

@end
