/**
 *    Copyright (C) 2012 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/platform/basic.h"

#include "mongo/db/jsobj.h"
#include "mongo/s/chunk_version.h"
#include "mongo/unittest/unittest.h"

namespace mongo {
namespace {

/**
 * Tests parsing of BSON for versions.  In version 2.2, this parsing is meant to be very
 * flexible so different formats can be tried and enforced later.
 *
 * Formats are:
 *
 * A) { vFieldName : <TSTYPE>, [ vFieldNameEpoch : <OID> ], ... }
 * B) { fieldName : [ <TSTYPE>, <OID> ], ... }
 *
 * vFieldName is a specifyable name - usually "version" (default) or "lastmod".  <TSTYPE> is a
 * type convertible to Timestamp, ideally Timestamp but also numeric.
 * <OID> is a value of type OID.
 *
 */
TEST(Compatibility, LegacyFormatA) {
    BSONObjBuilder versionObjB;
    versionObjB.appendTimestamp("testVersion", ChunkVersion(1, 1, OID()).toLong());
    versionObjB.append("testVersionEpoch", OID::gen());
    BSONObj versionObj = versionObjB.obj();

    ChunkVersion parsed = ChunkVersion::fromBSON(versionObj["testVersion"]);

    ASSERT(ChunkVersion::canParseBSON(versionObj["testVersion"]));
    ASSERT(parsed.majorVersion() == 1);
    ASSERT(parsed.minorVersion() == 1);
    ASSERT(!parsed.epoch().isSet());

    parsed = ChunkVersion::fromBSON(versionObj, "testVersion");

    ASSERT(ChunkVersion::canParseBSON(versionObj, "testVersion"));
    ASSERT(parsed.majorVersion() == 1);
    ASSERT(parsed.minorVersion() == 1);
    ASSERT(parsed.epoch().isSet());
}

TEST(Compatibility, SubArrayFormatB) {
    BSONObjBuilder tsObjB;
    tsObjB.appendTimestamp("ts", ChunkVersion(1, 1, OID()).toLong());
    BSONObj tsObj = tsObjB.obj();

    BSONObjBuilder versionObjB;
    BSONArrayBuilder subArrB(versionObjB.subarrayStart("testVersion"));
    // Append this weird way so we're sure we get a timestamp type
    subArrB.append(tsObj.firstElement());
    subArrB.append(OID::gen());
    subArrB.done();
    BSONObj versionObj = versionObjB.obj();

    ChunkVersion parsed = ChunkVersion::fromBSON(versionObj["testVersion"]);

    ASSERT(ChunkVersion::canParseBSON(versionObj["testVersion"]));
    ASSERT(ChunkVersion::canParseBSON(BSONArray(versionObj["testVersion"].Obj())));
    ASSERT(parsed.majorVersion() == 1);
    ASSERT(parsed.minorVersion() == 1);
    ASSERT(parsed.epoch().isSet());
}

TEST(Comparison, StrictEqual) {
    OID epoch = OID::gen();

    ASSERT(ChunkVersion(3, 1, epoch).isStrictlyEqualTo(ChunkVersion(3, 1, epoch)));
    ASSERT(!ChunkVersion(3, 1, epoch).isStrictlyEqualTo(ChunkVersion(3, 1, OID())));
    ASSERT(!ChunkVersion(3, 1, OID()).isStrictlyEqualTo(ChunkVersion(3, 1, epoch)));
    ASSERT(ChunkVersion(3, 1, OID()).isStrictlyEqualTo(ChunkVersion(3, 1, OID())));
    ASSERT(!ChunkVersion(4, 2, epoch).isStrictlyEqualTo(ChunkVersion(4, 1, epoch)));
}

TEST(Comparison, OlderThan) {
    OID epoch = OID::gen();

    ASSERT(ChunkVersion(3, 1, epoch).isOlderThan(ChunkVersion(4, 1, epoch)));
    ASSERT(!ChunkVersion(4, 1, epoch).isOlderThan(ChunkVersion(3, 1, epoch)));

    ASSERT(ChunkVersion(3, 1, epoch).isOlderThan(ChunkVersion(3, 2, epoch)));
    ASSERT(!ChunkVersion(3, 2, epoch).isOlderThan(ChunkVersion(3, 1, epoch)));

    ASSERT(!ChunkVersion(3, 1, epoch).isOlderThan(ChunkVersion(4, 1, OID())));
    ASSERT(!ChunkVersion(4, 1, OID()).isOlderThan(ChunkVersion(3, 1, epoch)));

    ASSERT(ChunkVersion(3, 2, epoch).isOlderThan(ChunkVersion(4, 1, epoch)));

    ASSERT(!ChunkVersion(3, 1, epoch).isOlderThan(ChunkVersion(3, 1, epoch)));
}

}  // unnamed namespace
}  // namespace mongo
