/**
 *    Copyright (C) 2013 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program 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 Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/db/ops/update_lifecycle_impl.h"

#include "mongo/db/client.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/field_ref.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/s/chunk_version.h"
#include "mongo/s/d_logic.h"

namespace mongo {
    namespace {
        CollectionMetadataPtr getMetadata(const NamespaceString& nsString) {
            if (shardingState.enabled()) {
                return shardingState.getCollectionMetadata(nsString.ns());
            }

            return CollectionMetadataPtr();
        }
    }

    UpdateLifecycleImpl::UpdateLifecycleImpl(bool ignoreVersion, const NamespaceString& nsStr)
        : _nsString(nsStr)
        , _shardVersion((!ignoreVersion && getMetadata(_nsString)) ?
            getMetadata(_nsString)->getShardVersion() :
            ChunkVersion::IGNORED()) {
    }

    void UpdateLifecycleImpl::setCollection(Collection* collection) {
        _collection = collection;
    }

    bool UpdateLifecycleImpl::canContinue() const {
        // Collection needs to exist to continue
        return _collection;
    }

    const UpdateIndexData* UpdateLifecycleImpl::getIndexKeys() const {
        if (_collection)
            return &_collection->infoCache()->indexKeys();
        return NULL;
    }

    const std::vector<FieldRef*>* UpdateLifecycleImpl::getImmutableFields() const {
        CollectionMetadataPtr metadata = getMetadata(_nsString);
        if (metadata) {
            const std::vector<FieldRef*>& fields = metadata->getKeyPatternFields();
            // Return shard-keys as immutable for the update system.
            return &fields;
        }
        return NULL;
    }

} // namespace mongo
