//
//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
//

#import <SignalUtilitiesKit/AppContext.h>
#import <SignalCoreKit/NSObject+OWS.h>
#import <SignalCoreKit/OWSAsserts.h>

NS_ASSUME_NONNULL_BEGIN

#pragma mark - Singleton Asserts

// The "singleton asserts" can be used to ensure
// that we only create a singleton once.
//
// The simplest way to use them is the OWSSingletonAssert() macro.
// It is intended to be used inside the singleton's initializer.
//
// If, however, a singleton has multiple possible initializers,
// you need to:
//
// 1. Use OWSSingletonAssertFlag() outside the class definition.
// 2. Use OWSSingletonAssertInit() in each initializer.

#ifdef DEBUG

#define ENFORCE_SINGLETONS

#endif

#ifdef ENFORCE_SINGLETONS

#define OWSSingletonAssertFlag() static BOOL _isSingletonCreated = NO;

#define OWSSingletonAssertInit()                                                                                       \
    @synchronized([self class]) {                                                                                      \
        if (!CurrentAppContext().isRunningTests) {                                                                     \
            OWSAssertDebug(!_isSingletonCreated);                                                                      \
            _isSingletonCreated = YES;                                                                                 \
        }                                                                                                              \
    }

#define OWSSingletonAssert() OWSSingletonAssertFlag() OWSSingletonAssertInit()

#else

#define OWSSingletonAssertFlag()
#define OWSSingletonAssertInit()
#define OWSSingletonAssert()

#endif

#define OWSFailDebugUnlessRunningTests(_messageFormat, ...)                                                            \
    do {                                                                                                               \
        if (!CurrentAppContext().isRunningTests) {                                                                     \
            OWSFailDebug(_messageFormat, ##__VA_ARGS__);                                                               \
        }                                                                                                              \
    } while (0)

#define OWSCFailDebugUnlessRunningTests(_messageFormat, ...)                                                           \
    do {                                                                                                               \
        if (!CurrentAppContext().isRunningTests) {                                                                     \
            OWSCFailDebug(_messageFormat, ##__VA_ARGS__);                                                              \
        }                                                                                                              \
    } while (NO)


NS_ASSUME_NONNULL_END