/**
 *    Copyright (C) 2015 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/platform/basic.h"

#include "mongo/db/repl/rollback_source_impl.h"

#include "mongo/client/dbclientinterface.h"
#include "mongo/db/cloner.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/oplogreader.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/mongoutils/str.h"

namespace mongo {
namespace repl {

RollbackSourceImpl::RollbackSourceImpl(GetConnectionFn getConnection,
                                       const HostAndPort& source,
                                       const std::string& collectionName,
                                       int batchSize)
    : _getConnection(getConnection),
      _source(source),
      _collectionName(collectionName),
      _oplog(source, getConnection, collectionName, batchSize) {}

const OplogInterface& RollbackSourceImpl::getOplog() const {
    return _oplog;
}

const HostAndPort& RollbackSourceImpl::getSource() const {
    return _source;
}


int RollbackSourceImpl::getRollbackId() const {
    bo info;
    _getConnection()->simpleCommand("admin", &info, "replSetGetRBID");
    return info["rbid"].numberInt();
}

BSONObj RollbackSourceImpl::getLastOperation() const {
    const Query query = Query().sort(BSON("$natural" << -1));
    return _getConnection()->findOne(_collectionName, query, 0, QueryOption_SlaveOk);
}

BSONObj RollbackSourceImpl::findOne(const NamespaceString& nss, const BSONObj& filter) const {
    return _getConnection()->findOne(nss.toString(), filter, NULL, QueryOption_SlaveOk).getOwned();
}

std::pair<BSONObj, NamespaceString> RollbackSourceImpl::findOneByUUID(const std::string& db,
                                                                      UUID uuid,
                                                                      const BSONObj& filter) const {
    return _getConnection()->findOneByUUID(db, uuid, filter);
}

void RollbackSourceImpl::copyCollectionFromRemote(OperationContext* opCtx,
                                                  const NamespaceString& nss) const {
    std::string errmsg;
    auto tmpConn = stdx::make_unique<DBClientConnection>();
    uassert(15908,
            errmsg,
            tmpConn->connect(_source, StringData(), errmsg) && replAuthenticate(tmpConn.get()));

    // cloner owns _conn in unique_ptr
    Cloner cloner;
    cloner.setConnection(std::move(tmpConn));
    uassert(15909,
            str::stream() << "replSet rollback error resyncing collection " << nss.ns() << ' '
                          << errmsg,
            cloner.copyCollection(
                opCtx, nss.ns(), BSONObj(), errmsg, true, CollectionOptions::parseForStorage));
}

StatusWith<BSONObj> RollbackSourceImpl::getCollectionInfoByUUID(const std::string& db,
                                                                const UUID& uuid) const {
    std::list<BSONObj> info = _getConnection()->getCollectionInfos(db, BSON("info.uuid" << uuid));
    if (info.empty()) {
        return StatusWith<BSONObj>(ErrorCodes::NoSuchKey,
                                   str::stream()
                                       << "No collection info found for collection with uuid: "
                                       << uuid.toString()
                                       << " in db: "
                                       << db);
    }
    invariant(info.size() == 1U);
    return info.front();
}

StatusWith<BSONObj> RollbackSourceImpl::getCollectionInfo(const NamespaceString& nss) const {
    std::list<BSONObj> info =
        _getConnection()->getCollectionInfos(nss.db().toString(), BSON("name" << nss.coll()));
    if (info.empty()) {
        return StatusWith<BSONObj>(ErrorCodes::NoSuchKey,
                                   str::stream() << "no collection info found: " << nss.ns());
    }
    invariant(info.size() == 1U);
    return info.front();
}

}  // namespace repl
}  // namespace mongo