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/* vim: set sw=4 sts=4 et foldmethod=syntax : */

/*
 * Copyright (c) 2010, 2011 Ciaran McCreesh
 *
 * This file is part of the Paludis package manager. Paludis is free software;
 * you can redistribute it and/or modify it under the terms of the GNU General
 * Public License version 2, as published by the Free Software Foundation.
 *
 * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <paludis/resolver/job_requirements.hh>
#include <paludis/util/exception.hh>
#include <paludis/util/stringify.hh>
#include <paludis/util/wrapped_forward_iterator-impl.hh>
#include <paludis/util/sequence-impl.hh>
#include <paludis/util/make_named_values.hh>
#include <paludis/util/enum_iterator.hh>
#include <paludis/serialise-impl.hh>
#include <istream>
#include <ostream>
#include <set>

using namespace paludis;
using namespace paludis::resolver;

#include <paludis/resolver/job_requirements-se.cc>

const JobRequirement
JobRequirement::deserialise(Deserialisation & d)
{
    Deserialisator v(d, "JobRequirement");
    return make_named_values<JobRequirement>(
            n::job_number() = v.member<JobNumber>("job_number"),
            n::required_if() = v.member<JobRequirementIfs>("required_if")
            );
}

void
JobRequirement::serialise(Serialiser & s) const
{
    s.object("JobRequirement")
        .member(SerialiserFlags<>(), "job_number", job_number())
        .member(SerialiserFlags<>(), "required_if", required_if())
        ;
}

bool
JobRequirementComparator::operator() (const JobRequirement & a, const JobRequirement & b)
{
    if (a.job_number() < b.job_number())
        return true;
    if (a.job_number() > b.job_number())
        return false;

    for (EnumIterator<JobRequirementIf> t, t_end(last_jri) ; t != t_end ; ++t)
    {
        if (a.required_if()[*t] < b.required_if()[*t])
            return true;
        if (a.required_if()[*t] > b.required_if()[*t])
            return false;
    }

    return false;
}

const std::shared_ptr<JobRequirements>
paludis::resolver::minimise_requirements(const std::shared_ptr<const JobRequirements> & reqs)
{
    const std::shared_ptr<JobRequirements> result(std::make_shared<JobRequirements>());
    std::set<JobRequirement, JobRequirementComparator> duplicates;

    for (auto r(reqs->begin()), r_end(reqs->end()) ;
            r != r_end ; ++r)
    {
        if (! duplicates.insert(*r).second)
            continue;

        result->push_back(*r);
    }

    return result;
}

namespace paludis
{
    template class Sequence<JobRequirement>;
    template class WrappedForwardIterator<Sequence<JobRequirement>::ConstIteratorTag, const JobRequirement>;
}