/**
 *    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/storage/record_store_test_harness.h"


#include "mongo/db/record_id.h"
#include "mongo/db/storage/record_data.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/unittest/unittest.h"

namespace mongo {
namespace {

using std::unique_ptr;
using std::set;
using std::string;
using std::stringstream;

// Create an iterator for repairing an empty record store.
TEST(RecordStoreTestHarness, GetIteratorForRepairEmpty) {
    const auto harnessHelper(newRecordStoreHarnessHelper());
    unique_ptr<RecordStore> rs(harnessHelper->newNonCappedRecordStore());

    {
        ServiceContext::UniqueOperationContext opCtx(harnessHelper->newOperationContext());
        ASSERT_EQUALS(0, rs->numRecords(opCtx.get()));
    }

    {
        ServiceContext::UniqueOperationContext opCtx(harnessHelper->newOperationContext());
        auto cursor = rs->getCursorForRepair(opCtx.get());
        // returns NULL if getCursorForRepair is not supported
        if (!cursor) {
            return;
        }
        ASSERT(!cursor->next());
    }
}

// Insert multiple records and create an iterator for repairing the record store,
// even though the it has not been corrupted.
TEST(RecordStoreTestHarness, GetIteratorForRepairNonEmpty) {
    const auto harnessHelper(newRecordStoreHarnessHelper());
    unique_ptr<RecordStore> rs(harnessHelper->newNonCappedRecordStore());

    {
        ServiceContext::UniqueOperationContext opCtx(harnessHelper->newOperationContext());
        ASSERT_EQUALS(0, rs->numRecords(opCtx.get()));
    }

    const int nToInsert = 10;
    RecordId locs[nToInsert];
    for (int i = 0; i < nToInsert; i++) {
        ServiceContext::UniqueOperationContext opCtx(harnessHelper->newOperationContext());
        {
            stringstream ss;
            ss << "record " << i;
            string data = ss.str();

            WriteUnitOfWork uow(opCtx.get());
            StatusWith<RecordId> res =
                rs->insertRecord(opCtx.get(), data.c_str(), data.size() + 1, Timestamp());
            ASSERT_OK(res.getStatus());
            locs[i] = res.getValue();
            uow.commit();
        }
    }

    {
        ServiceContext::UniqueOperationContext opCtx(harnessHelper->newOperationContext());
        ASSERT_EQUALS(nToInsert, rs->numRecords(opCtx.get()));
    }

    set<RecordId> remain(locs, locs + nToInsert);
    {
        ServiceContext::UniqueOperationContext opCtx(harnessHelper->newOperationContext());
        auto cursor = rs->getCursorForRepair(opCtx.get());
        // returns NULL if getCursorForRepair is not supported
        if (!cursor) {
            return;
        }

        while (auto record = cursor->next()) {
            remain.erase(record->id);  // can happen more than once per doc
        }
        ASSERT(remain.empty());

        ASSERT(!cursor->next());
    }
}

}  // namespace
}  // namespace mongo