#import <Foundation/Foundation.h>
#import "Terminable.h"
#import "CollapsingFutures.h"
#import "Operation.h"

@interface TimeUtil : NSObject

+(NSTimeInterval) time;

/// Result has type Future(TypeOfValueReturnedByFunction)
+(TOCFuture*) scheduleEvaluate:(Function)function
                    afterDelay:(NSTimeInterval)delay
                     onRunLoop:(NSRunLoop*)runLoop
               unlessCancelled:(TOCCancelToken*)unlessCancelledToken;

/// Result has type Future(TypeOfValueReturnedByFunction)
+(TOCFuture*) scheduleEvaluate:(Function)function
                            at:(NSDate*)date
                     onRunLoop:(NSRunLoop*)runLoop
               unlessCancelled:(TOCCancelToken*)unlessCancelledToken;

+(void) scheduleRun:(Action)action
         afterDelay:(NSTimeInterval)delay
          onRunLoop:(NSRunLoop*)runLoop
    unlessCancelled:(TOCCancelToken*)unlessCancelledToken;

+(void) scheduleRun:(Action)action
                 at:(NSDate*)date
          onRunLoop:(NSRunLoop*)runLoop
    unlessCancelled:(TOCCancelToken*)unlessCancelledToken;

+(void) scheduleRun:(Action)action
       periodically:(NSTimeInterval)interval
          onRunLoop:(NSRunLoop*)runLoop
     untilCancelled:(TOCCancelToken*)untilCancelledToken
  andRunImmediately:(BOOL)shouldRunImmediately;

@end