/**
 *    Copyright (C) 2016 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.
 */

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand

#include "mongo/platform/basic.h"

#include <vector>

#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog/type_shard.h"
#include "mongo/s/catalog/type_tags.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/remove_shard_from_zone_request_type.h"
#include "mongo/util/log.h"

namespace mongo {

using std::string;

namespace {

const ReadPreferenceSetting kPrimaryOnlyReadPreference{ReadPreference::PrimaryOnly};
const WriteConcernOptions kMajorityWriteConcern(WriteConcernOptions::kMajority,
                                                // Note: Even though we're setting UNSET here,
                                                // kMajority implies JOURNAL if journaling is
                                                // supported by mongod and
                                                // writeConcernMajorityJournalDefault is set to true
                                                // in the ReplSetConfig.
                                                WriteConcernOptions::SyncMode::UNSET,
                                                Seconds(15));

/**
 * {
 *   removeShardFromZone: <string shardName>,
 *   zone: <string zoneName>
 * }
 */
class RemoveShardFromZoneCmd : public BasicCommand {
public:
    RemoveShardFromZoneCmd() : BasicCommand("removeShardFromZone", "removeshardfromzone") {}

    virtual bool slaveOk() const {
        return true;
    }

    virtual bool adminOnly() const {
        return true;
    }

    virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
        return false;
    }

    virtual void help(std::stringstream& help) const {
        help << "removes a shard from the zone";
    }

    Status checkAuthForCommand(Client* client,
                               const std::string& dbname,
                               const BSONObj& cmdObj) override {
        if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
                ResourcePattern::forExactNamespace(NamespaceString(ShardType::ConfigNS)),
                ActionType::update)) {
            return Status(ErrorCodes::Unauthorized, "Unauthorized");
        }

        if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
                ResourcePattern::forExactNamespace(NamespaceString(TagsType::ConfigNS)),
                ActionType::find)) {
            return Status(ErrorCodes::Unauthorized, "Unauthorized");
        }

        return Status::OK();
    }

    virtual bool run(OperationContext* opCtx,
                     const std::string& dbname,
                     const BSONObj& cmdObj,
                     std::string& errmsg,
                     BSONObjBuilder& result) {
        auto parsedRequest =
            uassertStatusOK(RemoveShardFromZoneRequest::parseFromMongosCommand(cmdObj));

        BSONObjBuilder cmdBuilder;
        parsedRequest.appendAsConfigCommand(&cmdBuilder);
        cmdBuilder.append("writeConcern", kMajorityWriteConcern.toBSON());

        auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
        auto cmdResponseStatus = uassertStatusOK(
            configShard->runCommandWithFixedRetryAttempts(opCtx,
                                                          kPrimaryOnlyReadPreference,
                                                          "admin",
                                                          cmdBuilder.obj(),
                                                          Shard::RetryPolicy::kIdempotent));
        uassertStatusOK(cmdResponseStatus.commandStatus);
        return true;
    }

} removeShardFromZoneCmd;

}  // namespace
}  // namespace mongo