/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2018 Danny Robson <danny@nerdcruft.net>
 */

#include "length.hpp"

#include "../tree.hpp"

using util::json::schema::constraint::length;


///////////////////////////////////////////////////////////////////////////////
namespace {
    template <typename ComparatorT>
    struct field_name { };


    template <>
    struct field_name<std::greater_equal<std::size_t>> {
        static constexpr char const *const value = "minLength";
    };


    template <>
    struct field_name<std::less_equal<std::size_t>> {
        static constexpr char const *const value = "maxLength";
    };


    template <typename ComparatorT>
    static constexpr auto field_name_v = field_name<ComparatorT>::value;
}


///////////////////////////////////////////////////////////////////////////////
template <typename ComparatorT>
length<ComparatorT>::length(::json::tree::node const &def):
    m_length(def.as<std::size_t> ())
{ ; }



///////////////////////////////////////////////////////////////////////////////
template <typename ComparatorT>
typename length<ComparatorT>::output_iterator
length<ComparatorT>::validate (output_iterator res, ::json::tree::node &target) const noexcept
{
    if (!target.is_string ()) {
        return *res++ = failure { .rule = *this, .target = target };
    }

    auto const &val = target.as_string ();
    if (!ComparatorT{}(val.size (), m_length))
        *res++ = failure { .rule = *this, .target = target };

    return res;
}


///////////////////////////////////////////////////////////////////////////////
template <typename ComparatorT>
std::ostream&
length<ComparatorT>::describe (std::ostream &os) const
{
    return os << "{ " << ::field_name_v<ComparatorT> << ": " << m_length << " }";
}


///////////////////////////////////////////////////////////////////////////////
template class util::json::schema::constraint::length<std::less_equal<std::size_t>>;
template class util::json::schema::constraint::length<std::greater_equal<std::size_t>>;