/*  NSOperation.h
    Copyright (c) 2006-2015, Apple Inc. All rights reserved.
 */

#import <Foundation/NSObject.h>
#import <sys/qos.h>
#import <dispatch/dispatch.h>

@class NSArray<ObjectType>, NSSet;

NS_ASSUME_NONNULL_BEGIN

#define NSOperationQualityOfService NSQualityOfService
#define NSOperationQualityOfServiceUserInteractive NSQualityOfServiceUserInteractive
#define NSOperationQualityOfServiceUserInitiated NSQualityOfServiceUserInitiated
#define NSOperationQualityOfServiceUtility NSQualityOfServiceUtility
#define NSOperationQualityOfServiceBackground NSQualityOfServiceBackground


NS_CLASS_AVAILABLE(10_5, 2_0)
@interface NSOperation : NSObject {
@private
    id _private;
    int32_t _private1;
#if __LP64__
    int32_t _private1b;
#endif
}

- (void)start;
- (void)main;

@property (readonly, getter=isCancelled) BOOL cancelled;
- (void)cancel;

@property (readonly, getter=isExecuting) BOOL executing;
@property (readonly, getter=isFinished) BOOL finished;
@property (readonly, getter=isConcurrent) BOOL concurrent; // To be deprecated; use and override 'asynchronous' below
@property (readonly, getter=isAsynchronous) BOOL asynchronous NS_AVAILABLE(10_8, 7_0);
@property (readonly, getter=isReady) BOOL ready;

- (void)addDependency:(NSOperation *)op;
- (void)removeDependency:(NSOperation *)op;

@property (readonly, copy) NSArray<NSOperation *> *dependencies;

typedef NS_ENUM(NSInteger, NSOperationQueuePriority) {
    NSOperationQueuePriorityVeryLow = -8L,
    NSOperationQueuePriorityLow = -4L,
    NSOperationQueuePriorityNormal = 0,
    NSOperationQueuePriorityHigh = 4,
    NSOperationQueuePriorityVeryHigh = 8
};

@property NSOperationQueuePriority queuePriority;

@property (nullable, copy) void (^completionBlock)(void) NS_AVAILABLE(10_6, 4_0);

- (void)waitUntilFinished NS_AVAILABLE(10_6, 4_0);

@property double threadPriority NS_DEPRECATED(10_6, 10_10, 4_0, 8_0);

@property NSQualityOfService qualityOfService NS_AVAILABLE(10_10, 8_0);

@property (nullable, copy) NSString *name NS_AVAILABLE(10_10, 8_0);

@end



NS_CLASS_AVAILABLE(10_6, 4_0)
@interface NSBlockOperation : NSOperation {
@private
    id _private2;
    void *_reserved2;
}

+ (instancetype)blockOperationWithBlock:(void (^)(void))block;

- (void)addExecutionBlock:(void (^)(void))block;
@property (readonly, copy) NSArray<void (^)(void)> *executionBlocks;

@end


NS_CLASS_AVAILABLE(10_5, 2_0)
NS_SWIFT_UNAVAILABLE("NSInvocation and related APIs not available")
@interface NSInvocationOperation : NSOperation {
@private
    id _inv;
    id _exception;
    void *_reserved2;
}

- (nullable instancetype)initWithTarget:(id)target selector:(SEL)sel object:(nullable id)arg;
- (instancetype)initWithInvocation:(NSInvocation *)inv NS_DESIGNATED_INITIALIZER;

@property (readonly, retain) NSInvocation *invocation;

@property (nullable, readonly, retain) id result;

@end

FOUNDATION_EXPORT NSString * const NSInvocationOperationVoidResultException NS_AVAILABLE(10_5, 2_0);
FOUNDATION_EXPORT NSString * const NSInvocationOperationCancelledException NS_AVAILABLE(10_5, 2_0);

static const NSInteger NSOperationQueueDefaultMaxConcurrentOperationCount = -1;

NS_CLASS_AVAILABLE(10_5, 2_0)
@interface NSOperationQueue : NSObject {
@private
    id _private;
    void *_reserved;
}

- (void)addOperation:(NSOperation *)op;
- (void)addOperations:(NSArray<NSOperation *> *)ops waitUntilFinished:(BOOL)wait NS_AVAILABLE(10_6, 4_0);

- (void)addOperationWithBlock:(void (^)(void))block NS_AVAILABLE(10_6, 4_0);

@property (readonly, copy) NSArray<__kindof NSOperation *> *operations;
@property (readonly) NSUInteger operationCount NS_AVAILABLE(10_6, 4_0);

@property NSInteger maxConcurrentOperationCount;

@property (getter=isSuspended) BOOL suspended;

@property (nullable, copy) NSString *name NS_AVAILABLE(10_6, 4_0);

@property NSQualityOfService qualityOfService NS_AVAILABLE(10_10, 8_0);

@property (nullable, assign /* actually retain */) dispatch_queue_t underlyingQueue NS_AVAILABLE(10_10, 8_0);

- (void)cancelAllOperations;

- (void)waitUntilAllOperationsAreFinished;

+ (nullable NSOperationQueue *)currentQueue NS_AVAILABLE(10_6, 4_0);
+ (NSOperationQueue *)mainQueue NS_AVAILABLE(10_6, 4_0);

@end

NS_ASSUME_NONNULL_END