//
//  TWTRRequestSigningOperation.h
//  TwitterKit
//
//  Created by Chase Latta on 6/24/15.
//  Copyright (c) 2015 Twitter. All rights reserved.
//

#import <Foundation/Foundation.h>

@class TWTRGuestSession;
@class TWTRNetworkingPipelinePackage;
@class TWTRSession;

NS_ASSUME_NONNULL_BEGIN

/**
 * The block that is executed after the request is signed.
 */
typedef void (^TWTRRequestSigningSuccessBlock)(NSURLRequest *signedRequest);

/**
 * The block that is executed if the operation is cancelled.
 */
typedef void (^TWTRRequestSigningCancelBlock)(void);

typedef TWTRGuestSession *_Nonnull (^TWTRGuestSessionProvider)(void);
typedef TWTRSession *_Nonnull (^TWTRUserSessionProvider)(void);

/**
 * Do not instantiate this operation directly. Use one of the concrete
 * subclasses instead.
 */
@interface TWTRRequestSigningOperation : NSOperation

@property (nonatomic, readonly) TWTRNetworkingPipelinePackage *networkingPackage;

/**
 * Creates a signing operation.
 *
 * @param package the pipeline package that holds the request to sign
 * @param successBlock a block to execute when the package is signed.
 * @param cancelBlock a block to execute when the operation is cancelled.
 *
 * @note the callback blocks will execute on arbitrary queues.
 */
- (instancetype)initWithPackage:(TWTRNetworkingPipelinePackage *)package success:(nullable TWTRRequestSigningSuccessBlock)successBlock cancel:(nullable TWTRRequestSigningCancelBlock)cancelBlock;

- (instancetype)init NS_UNAVAILABLE;

/**
 * Subclasses must implement this method to return the signed request.
 */
- (NSURLRequest *)signRequest:(NSURLRequest *)request;

@end

@interface TWTRGuestRequestSigningOperation : TWTRRequestSigningOperation

/**
 * Creates a guest signing operation.
 *
 * @param package the pipeline package that holds the request to sign.
 * @param sessionProvider a block that will execute to provide the session at invocation time.
 * @param successBlock a block to execute when the package is signed.
 * @param cancelBlock a block to execute when the operation is cancelled.
 *
 * @note the callback blocks will execute on arbitrary queues.
 */
- (instancetype)initWithPackage:(TWTRNetworkingPipelinePackage *)package sessionProvider:(TWTRGuestSessionProvider)sessionProvider success:(nullable TWTRRequestSigningSuccessBlock)successBlock cancel:(nullable TWTRRequestSigningCancelBlock)cancelBlock;

@end

@interface TWTRUserRequestSigningOperation : TWTRRequestSigningOperation

/**
 * Creates a user signing operation.
 *
 * @param package the pipeline package that holds the request to sign.
 * @param sessionProvider a block that will execute to provide the session at invocation time.
 * @param successBlock a block to execute when the package is signed.
 * @param cancelBlock a block to execute when the operation is cancelled.
 *
 * @note the callback blocks will execute on arbitrary queues.
 */
- (instancetype)initWithPackage:(TWTRNetworkingPipelinePackage *)package sessionProvider:(TWTRUserSessionProvider)sessionProvider success:(nullable TWTRRequestSigningSuccessBlock)successBlock cancel:(nullable TWTRRequestSigningCancelBlock)cancelBlock;

@end

NS_ASSUME_NONNULL_END