/**
 *    Copyright (C) 2008 10gen 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/delete.h"

#include "mongo/db/exec/delete.h"
#include "mongo/db/ops/delete_request.h"
#include "mongo/db/ops/parsed_delete.h"
#include "mongo/db/query/get_executor.h"

namespace mongo {

    /* ns:      namespace, e.g. <database>.<collection>
       pattern: the "where" clause / criteria
       justOne: stop after 1 match
       god:     allow access to system namespaces, and don't yield
    */
    long long deleteObjects(OperationContext* txn,
                            Database* db,
                            const StringData& ns,
                            BSONObj pattern,
                            PlanExecutor::YieldPolicy policy,
                            bool justOne,
                            bool logop,
                            bool god,
                            bool fromMigrate) {
        NamespaceString nsString(ns);
        DeleteRequest request(nsString);
        request.setQuery(pattern);
        request.setMulti(!justOne);
        request.setUpdateOpLog(logop);
        request.setGod(god);
        request.setFromMigrate(fromMigrate);
        request.setYieldPolicy(policy);

        Collection* collection = NULL;
        if (db) {
            collection = db->getCollection(nsString.ns());
        }

        ParsedDelete parsedDelete(txn, &request);
        uassertStatusOK(parsedDelete.parseRequest());

        PlanExecutor* rawExec;
        uassertStatusOK(getExecutorDelete(txn, collection, &parsedDelete, &rawExec));
        boost::scoped_ptr<PlanExecutor> exec(rawExec);

        uassertStatusOK(exec->executePlan());
        return DeleteStage::getNumDeleted(exec.get());
    }

}  // namespace mongo