/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    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 Server Side 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 <string>

#include "mongo/bson/util/builder.h"
#include "mongo/db/dbmessage.h"
#include "mongo/unittest/unittest.h"

namespace mongo {
using std::string;

// Test if the reserved field is short of 4 bytes
TEST(DBMessage1, ShortFlags) {
    BufBuilder b;
    string ns("test");

    b.appendChar(1);

    Message toSend;
    toSend.setData(dbDelete, b.buf(), b.len());

    ASSERT_THROWS(DbMessage(toSend), AssertionException);
}

// Test a short NS missing a trailing null
TEST(DBMessage1, BadNS) {
    BufBuilder b;

    b.appendNum(static_cast<int>(1));
    b.appendChar('b');
    b.appendChar('a');
    b.appendChar('d');
    // Forget to append \0

    Message toSend;
    toSend.setData(dbDelete, b.buf(), b.len());

    ASSERT_THROWS(DbMessage(toSend), AssertionException);
}

// Test a valid kill message and try an extra pull
TEST(DBMessage1, GoodKill) {
    BufBuilder b;

    b.appendNum(static_cast<int>(1));
    b.appendNum(static_cast<int>(3));

    Message toSend;
    toSend.setData(dbKillCursors, b.buf(), b.len());

    DbMessage d1(toSend);
    ASSERT_EQUALS(3, d1.pullInt());

    ASSERT_THROWS(d1.pullInt(), AssertionException);
}

// Try a bad read of a type too large
TEST(DBMessage1, GoodKill2) {
    BufBuilder b;

    b.appendNum(static_cast<int>(1));
    b.appendNum(static_cast<int>(3));

    Message toSend;
    toSend.setData(dbKillCursors, b.buf(), b.len());

    DbMessage d1(toSend);
    ASSERT_THROWS(d1.pullInt64(), AssertionException);
}

// Test a basic good insert, and an extra read
TEST(DBMessage1, GoodInsert) {
    BufBuilder b;
    string ns("test");

    b.appendNum(static_cast<int>(1));
    b.appendStr(ns);
    b.appendNum(static_cast<int>(3));
    b.appendNum(static_cast<int>(39));

    Message toSend;
    toSend.setData(dbInsert, b.buf(), b.len());

    DbMessage d1(toSend);
    ASSERT_EQUALS(3, d1.pullInt());
    ASSERT_EQUALS(39, d1.pullInt());
    ASSERT_THROWS(d1.pullInt(), AssertionException);
}

// Test a basic good insert, and an extra read
TEST(DBMessage1, GoodInsert2) {
    BufBuilder b;
    string ns("test");

    b.appendNum(static_cast<int>(1));
    b.appendStr(ns);
    b.appendNum(static_cast<int>(3));
    b.appendNum(static_cast<int>(39));

    BSONObj bo = BSON("ts" << 0);
    bo.appendSelfToBufBuilder(b);

    Message toSend;
    toSend.setData(dbInsert, b.buf(), b.len());

    DbMessage d1(toSend);
    ASSERT_EQUALS(3, d1.pullInt());


    ASSERT_EQUALS(39, d1.pullInt());
    BSONObj bo2 = d1.nextJsObj();
    ASSERT_THROWS(d1.nextJsObj(), AssertionException);
}


}  // namespace mongo