/**
 *    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/s/write_ops/batched_request_metadata.h"

#include "mongo/db/field_parser.h"

namespace mongo {

    using std::auto_ptr;
    using std::string;

    const BSONField<string> BatchedRequestMetadata::shardName("shardName");
    const BSONField<ChunkVersion> BatchedRequestMetadata::shardVersion("shardVersion");
    const BSONField<long long> BatchedRequestMetadata::session("session");

    BatchedRequestMetadata::BatchedRequestMetadata():
            _isShardNameSet(false),
            _session(0),
            _isSessionSet(false) {
    }

    BatchedRequestMetadata::~BatchedRequestMetadata() {

    }

    bool BatchedRequestMetadata::isValid(string* errMsg) const {
        // all fields are mandatory.
        return true;
    }

    BSONObj BatchedRequestMetadata::toBSON() const {
        BSONObjBuilder metadataBuilder;

        if (_isShardNameSet) metadataBuilder << shardName(_shardName);

        if (_shardVersion.get()) {
            // ChunkVersion wants to be an array.
            metadataBuilder.append(shardVersion(),
                                   static_cast<BSONArray>(_shardVersion->toBSON()));
        }

        if (_isSessionSet) metadataBuilder << session(_session);

        return metadataBuilder.obj();
    }

    bool BatchedRequestMetadata::parseBSON(const BSONObj& source, string* errMsg) {
        clear();

        string dummy;
        if (!errMsg) errMsg = &dummy;

        FieldParser::FieldState fieldState;
        fieldState = FieldParser::extract(source, shardName, &_shardName, errMsg);
        if (fieldState == FieldParser::FIELD_INVALID) return false;
        _isShardNameSet = fieldState == FieldParser::FIELD_SET;

        ChunkVersion* tempChunkVersion = NULL;
        fieldState = FieldParser::extract(source, shardVersion,
                                          &tempChunkVersion, errMsg);
        if (fieldState == FieldParser::FIELD_INVALID) return false;
        if (fieldState == FieldParser::FIELD_SET) _shardVersion.reset(tempChunkVersion);

        fieldState = FieldParser::extract(source, session, &_session, errMsg);
        if (fieldState == FieldParser::FIELD_INVALID) return false;
        _isSessionSet = fieldState == FieldParser::FIELD_SET;

        return true;
    }

    void BatchedRequestMetadata::clear() {
        _shardName.clear();
        _isShardNameSet = false;

        _shardVersion.reset();

        _session = 0;
        _isSessionSet = false;
    }

    string BatchedRequestMetadata::toString() const {
        return toBSON().toString();
    }

    void BatchedRequestMetadata::cloneTo(BatchedRequestMetadata* other) const {
        other->_shardName = _shardName;
        other->_isShardNameSet = _isShardNameSet;

        if (other->_shardVersion.get()) _shardVersion->cloneTo(other->_shardVersion.get());

        other->_session = _session;
        other->_isSessionSet = _isSessionSet;
    }

    void BatchedRequestMetadata::setShardName( const StringData& shardName ) {
        _shardName = shardName.toString();
        _isShardNameSet = true;
    }

    void BatchedRequestMetadata::unsetShardName() {
        _isShardNameSet = false;
    }

    bool BatchedRequestMetadata::isShardNameSet() const {
        return _isShardNameSet;
    }

    const string& BatchedRequestMetadata::getShardName() const {
        dassert( _isShardNameSet );
        return _shardName;
    }

    void BatchedRequestMetadata::setShardVersion(const ChunkVersion& shardVersion) {
        auto_ptr<ChunkVersion> temp(new ChunkVersion);
        shardVersion.cloneTo(temp.get());
        _shardVersion.reset(temp.release());
    }

    void BatchedRequestMetadata::unsetShardVersion() {
        _shardVersion.reset();
     }

    bool BatchedRequestMetadata::isShardVersionSet() const {
        return _shardVersion.get() != NULL;
    }

    const ChunkVersion& BatchedRequestMetadata::getShardVersion() const {
        dassert(_shardVersion.get());
        return *_shardVersion;
    }

    void BatchedRequestMetadata::setSession(long long session) {
        _session = session;
        _isSessionSet = true;
    }

    void BatchedRequestMetadata::unsetSession() {
         _isSessionSet = false;
     }

    bool BatchedRequestMetadata::isSessionSet() const {
         return _isSessionSet;
    }

    long long BatchedRequestMetadata::getSession() const {
        dassert(_isSessionSet);
        return _session;
    }
}