//          Copyright Joakim Karlsson & Kim Gräsman 2010-2012.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

#ifndef SNOWHOUSE_ISLESSTHANOREQUALTOCONSTRAINT_H
#define SNOWHOUSE_ISLESSTHANOREQUALTOCONSTRAINT_H

#include "expressions/expression.h"

namespace snowhouse
{
    template <typename ExpectedType>
    struct IsLessThanOrEqualToConstraint :
        Expression<IsLessThanOrEqualToConstraint<ExpectedType>>
    {
        IsLessThanOrEqualToConstraint(const ExpectedType& expected):
            m_expected(expected)
        {
        }

        template <typename ActualType>
        bool operator()(const ActualType& actual) const
        {
            return (actual <= m_expected);
        }

        ExpectedType m_expected;
    };

    template <typename ExpectedType>
    inline IsLessThanOrEqualToConstraint<ExpectedType> IsLessThanOrEqualTo(
        const ExpectedType& expected)
    {
        return IsLessThanOrEqualToConstraint<ExpectedType>(expected);
    }

    inline IsLessThanOrEqualToConstraint<std::string> IsLessThanOrEqualTo(
        const char* expected)
    {
        return IsLessThanOrEqualToConstraint<std::string>(expected);
    }

    template <typename ExpectedType>
    struct Stringizer<IsLessThanOrEqualToConstraint<ExpectedType>>
    {
        static std::string ToString(
            const IsLessThanOrEqualToConstraint<ExpectedType>& constraint)
        {
            std::ostringstream builder;
            builder << "less than or equal to "
                    << snowhouse::Stringize(constraint.m_expected);

            return builder.str();
        }
    };
}

#endif
