// AFImageRequestOperation.h
//
// Copyright (c) 2011 Gowalla (http://gowalla.com/)
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#import <Foundation/Foundation.h>
#import "AFHTTPRequestOperation.h"

#import <Availability.h>

#if __IPHONE_OS_VERSION_MIN_REQUIRED
#import <UIKit/UIKit.h>
#elif __MAC_OS_X_VERSION_MIN_REQUIRED 
#import <Cocoa/Cocoa.h>
#endif

/**
 `AFImageRequestOperation` is a subclass of `AFHTTPRequestOperation` for downloading an processing images.
 
 ## Acceptable Content Types
 
 By default, `AFImageRequestOperation` accepts the following MIME types, which correspond to the image formats supported by UIImage or NSImage:
 
 - `image/tiff`
 - `image/jpeg`
 - `image/gif`
 - `image/png`
 - `image/ico`
 - `image/x-icon`
 - `image/bmp`
 - `image/x-bmp`
 - `image/x-xbitmap`
 - `image/x-win-bitmap`
 */
@interface AFImageRequestOperation : AFHTTPRequestOperation

/**
 An image constructed from the response data. If an error occurs during the request, `nil` will be returned, and the `error` property will be set to the error.
 */
#if __IPHONE_OS_VERSION_MIN_REQUIRED
@property (readonly, nonatomic, retain) UIImage *responseImage;
#elif __MAC_OS_X_VERSION_MIN_REQUIRED
@property (readonly, nonatomic, retain) NSImage *responseImage;
#endif

#if __IPHONE_OS_VERSION_MIN_REQUIRED
/**
 The scale factor used when interpreting the image data to construct `responseImage`. Specifying a scale factor of 1.0 results in an image whose size matches the pixel-based dimensions of the image. Applying a different scale factor changes the size of the image as reported by the size property. This is set to the value of scale of the main screen by default, which automatically scales images for retina displays, for instance.
 */
@property (nonatomic, assign) CGFloat imageScale;
#endif

/**
 Creates and returns an `AFImageRequestOperation` object and sets the specified success callback.
 
 @param urlRequest The request object to be loaded asynchronously during execution of the operation.
 @param success A block object to be executed when the request finishes successfully. This block has no return value and takes a single arguments, the image created from the response data of the request.
 
 @return A new image request operation
 */
#if __IPHONE_OS_VERSION_MIN_REQUIRED
+ (AFImageRequestOperation *)imageRequestOperationWithRequest:(NSURLRequest *)urlRequest                
                                                      success:(void (^)(UIImage *image))success;
#elif __MAC_OS_X_VERSION_MIN_REQUIRED
+ (AFImageRequestOperation *)imageRequestOperationWithRequest:(NSURLRequest *)urlRequest                
                                                      success:(void (^)(NSImage *image))success;
#endif

/**
 Creates and returns an `AFImageRequestOperation` object and sets the specified success callback.
 
 @param urlRequest The request object to be loaded asynchronously during execution of the operation.
 @param imageProcessingBlock A block object to be executed after the image request finishes successfully, but before the image is returned in the `success` block. This block takes a single argument, the image loaded from the response body, and returns the processed image.
 @param success A block object to be executed when the request finishes successfully, with a status code in the 2xx range, and with an acceptable content type (e.g. `image/png`). This block has no return value and takes three arguments: the request object of the operation, the response for the request, and the image created from the response data.
 @param failure A block object to be executed when the request finishes unsuccessfully. This block has no return value and takes three arguments: the request object of the operation, the response for the request, and the error associated with the cause for the unsuccessful operation.
 
 @return A new image request operation
 */
#if __IPHONE_OS_VERSION_MIN_REQUIRED
+ (AFImageRequestOperation *)imageRequestOperationWithRequest:(NSURLRequest *)urlRequest
                                         imageProcessingBlock:(UIImage *(^)(UIImage *image))imageProcessingBlock
                                                      success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image))success
                                                      failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error))failure;
#elif __MAC_OS_X_VERSION_MIN_REQUIRED
+ (AFImageRequestOperation *)imageRequestOperationWithRequest:(NSURLRequest *)urlRequest
                                         imageProcessingBlock:(NSImage *(^)(NSImage *image))imageProcessingBlock
                                                      success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSImage *image))success
                                                      failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error))failure;
#endif

@end