/**
 *    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 "mongo/platform/basic.h"

#include "mongo/db/repl/data_replicator_external_state_mock.h"

#include "mongo/db/repl/oplog_buffer_blocking_queue.h"
#include "mongo/stdx/memory.h"

namespace mongo {
namespace repl {

namespace {

class OplogApplierMock : public OplogApplier {
    MONGO_DISALLOW_COPYING(OplogApplierMock);

public:
    OplogApplierMock(executor::TaskExecutor* executor,
                     OplogBuffer* oplogBuffer,
                     Observer* observer,
                     DataReplicatorExternalStateMock* externalState)
        : OplogApplier(executor, oplogBuffer, observer),
          _observer(observer),
          _externalState(externalState) {}

private:
    void _run(OplogBuffer* oplogBuffer) final {}
    void _shutdown() final {}
    StatusWith<OpTime> _multiApply(OperationContext* opCtx, Operations ops) final {
        return _externalState->multiApplyFn(opCtx, ops, _observer);
    }

    OplogApplier::Observer* const _observer;
    DataReplicatorExternalStateMock* const _externalState;
};

}  // namespace

DataReplicatorExternalStateMock::DataReplicatorExternalStateMock()
    : multiApplyFn([](OperationContext*,
                      const MultiApplier::Operations& ops,
                      OplogApplier::Observer*) { return ops.back().getOpTime(); }) {}

executor::TaskExecutor* DataReplicatorExternalStateMock::getTaskExecutor() const {
    return taskExecutor;
}

OpTimeWithTerm DataReplicatorExternalStateMock::getCurrentTermAndLastCommittedOpTime() {
    return {currentTerm, lastCommittedOpTime};
}

void DataReplicatorExternalStateMock::processMetadata(
    const rpc::ReplSetMetadata& replMetadata, boost::optional<rpc::OplogQueryMetadata> oqMetadata) {
    replMetadataProcessed = replMetadata;
    if (oqMetadata) {
        oqMetadataProcessed = oqMetadata.get();
    }
    metadataWasProcessed = true;
}

bool DataReplicatorExternalStateMock::shouldStopFetching(
    const HostAndPort& source,
    const rpc::ReplSetMetadata& replMetadata,
    boost::optional<rpc::OplogQueryMetadata> oqMetadata) {
    lastSyncSourceChecked = source;

    // If OplogQueryMetadata was provided, use its values, otherwise use the ones in
    // ReplSetMetadata.
    if (oqMetadata) {
        syncSourceLastOpTime = oqMetadata->getLastOpApplied();
        syncSourceHasSyncSource = oqMetadata->getSyncSourceIndex() != -1;
    } else {
        syncSourceLastOpTime = replMetadata.getLastOpVisible();
        syncSourceHasSyncSource = replMetadata.getSyncSourceIndex() != -1;
    }
    return shouldStopFetchingResult;
}

std::unique_ptr<OplogBuffer> DataReplicatorExternalStateMock::makeInitialSyncOplogBuffer(
    OperationContext* opCtx) const {
    return stdx::make_unique<OplogBufferBlockingQueue>();
}

std::unique_ptr<OplogApplier> DataReplicatorExternalStateMock::makeOplogApplier(
    OplogBuffer* oplogBuffer,
    OplogApplier::Observer* observer,
    ReplicationConsistencyMarkers*,
    StorageInterface*,
    const OplogApplier::Options&,
    ThreadPool*) {
    return std::make_unique<OplogApplierMock>(getTaskExecutor(), oplogBuffer, observer, this);
}

StatusWith<ReplSetConfig> DataReplicatorExternalStateMock::getCurrentConfig() const {
    return replSetConfigResult;
}

}  // namespace repl
}  // namespace mongo