#include "monotonic_provider.h"

namespace NMonotonic {

    namespace {
        TIntrusivePtr<IMonotonicTimeProvider> GlobalMonotonicTimeProvider;
    }

    void TMonotonicOperator::RegisterProvider(TIntrusivePtr<IMonotonicTimeProvider> provider) {
        GlobalMonotonicTimeProvider = provider;
    }

    NMonotonic::TMonotonic TMonotonicOperator::Now() {
        if (GlobalMonotonicTimeProvider) {
            return GlobalMonotonicTimeProvider->Now();
        } else {
            return TMonotonic::Now();
        }
    }

    class TDefaultMonotonicTimeProvider: public IMonotonicTimeProvider {
    public:
        TMonotonic Now() override {
            return TMonotonic::Now();
        }
    };

    TIntrusivePtr<IMonotonicTimeProvider> CreateDefaultMonotonicTimeProvider() {
        return TIntrusivePtr<IMonotonicTimeProvider>(new TDefaultMonotonicTimeProvider);
    }

}