// counttests.cpp : count.{h,cpp} unit tests.

/**
 *    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/catalog/collection.h"
#include "mongo/db/db.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/json.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/stdx/thread.h"

#include "mongo/dbtests/dbtests.h"

namespace CountTests {

    class Base {
    public:
        Base() : _txn(),
                 _scopedXact(&_txn, MODE_IX),
                 _lk(_txn.lockState(),
                 nsToDatabaseSubstring(ns()), MODE_X),
                 _context(&_txn, ns()),
                 _client(&_txn) {

            _database = _context.db();

            {
                WriteUnitOfWork wunit(&_txn);
                _collection = _database->getCollection( ns() );
                if ( _collection ) {
                    _database->dropCollection( &_txn, ns() );
                }
                _collection = _database->createCollection( &_txn, ns() );
                wunit.commit();
            }

            addIndex( fromjson( "{\"a\":1}" ) );
        }
        ~Base() {
            try {
                WriteUnitOfWork wunit(&_txn);
                uassertStatusOK( _database->dropCollection( &_txn, ns() ) );
                wunit.commit();
            }
            catch ( ... ) {
                FAIL( "Exception while cleaning up collection" );
            }
        }

    protected:

        static const char *ns() {
            return "unittests.counttests";
        }

        void addIndex( const BSONObj &key ) {
            Helpers::ensureIndex(&_txn,
                                 _collection,
                                 key,
                                 /*unique=*/ false,
                                 /*name=*/ key.firstElementFieldName());
        }

        void insert( const char *s ) {
            WriteUnitOfWork wunit(&_txn);
            const BSONObj o = fromjson(s);

            if ( o["_id"].eoo() ) {
                BSONObjBuilder b;
                OID oid;
                oid.init();
                b.appendOID( "_id", &oid );
                b.appendElements( o );
                _collection->insertDocument( &_txn, b.obj(), false );
            }
            else {
                _collection->insertDocument( &_txn, o, false );
            }
            wunit.commit();
        }


        OperationContextImpl _txn;
        ScopedTransaction _scopedXact;
        Lock::DBLock _lk;

        OldClientContext _context;

        Database* _database;
        Collection* _collection;

        DBDirectClient _client;
    };
    
    class Basic : public Base {
    public:
        void run() {
            insert("{\"a\":\"b\"}");
            insert("{\"c\":\"d\"}");
            ASSERT_EQUALS(2ULL, _client.count(ns(), fromjson("{}")));
        }
    };
    
    class Query : public Base {
    public:
        void run() {
            insert( "{\"a\":\"b\"}" );
            insert( "{\"a\":\"b\",\"x\":\"y\"}" );
            insert( "{\"a\":\"c\"}" );
            ASSERT_EQUALS(2ULL, _client.count(ns(), fromjson("{\"a\":\"b\"}")));
        }
    };
    
    class QueryFields : public Base {
    public:
        void run() {
            insert( "{\"a\":\"b\"}" );
            insert( "{\"a\":\"c\"}" );
            insert( "{\"d\":\"e\"}" );
            ASSERT_EQUALS(1ULL, _client.count(ns(), fromjson("{\"a\":\"b\"}")));
        }
    };
    
    class IndexedRegex : public Base {
    public:
        void run() {
            insert( "{\"a\":\"c\"}" );
            insert( "{\"a\":\"b\"}" );
            insert( "{\"a\":\"d\"}" );
            ASSERT_EQUALS(1ULL, _client.count(ns(), fromjson("{\"a\":/^b/}")));
        }
    };

    
    class All : public Suite {
    public:
        All() : Suite( "count" ) {

        }
        
        void setupTests() {
            add<Basic>();
            add<Query>();
            add<QueryFields>();
            add<IndexedRegex>();
        }
    };

    SuiteInstance<All> myall;

} // namespace CountTests