/**
 *    Copyright (C) 2022-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/db/operation_context.h"
#include "mongo/db/operation_id.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/basic.h"
#include <functional>

#include "mongo/db/dbdirectclient.h"
#include "mongo/logv2/log.h"
#include "mongo/unittest/unittest.h"

#include "mongo/db/commands/set_cluster_parameter_invocation.h"
#include "mongo/idl/idl_parser.h"

#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault


namespace mongo {
namespace {

const WriteConcernOptions kMajorityWriteConcern{WriteConcernOptions::kMajority,
                                                WriteConcernOptions::SyncMode::UNSET,
                                                WriteConcernOptions::kNoTimeout};

// Mocks
class MockParameterService : public ServerParameterService {
public:
    MockParameterService(std::function<ServerParameter*(StringData)> get) : _getMock(get){};

    ServerParameter* get(StringData parameterName) {
        return _getMock(parameterName);
    }

private:
    std::function<ServerParameter*(StringData)> _getMock;
};

class MockServerParameter : public ServerParameter {
public:
    MockServerParameter(StringData name,
                        std::function<Status(const BSONElement& newValueElement)> validateImpl)
        : ServerParameter(name, ServerParameterType::kRuntimeOnly) {
        this->validateImpl = validateImpl;
    }
    void append(OperationContext* opCtx, BSONObjBuilder& b, const std::string& name) {}

    void appendSupportingRoundtrip(OperationContext* opCtx,
                                   BSONObjBuilder& b,
                                   const std::string& name) {}

    Status set(const BSONElement& newValueElement) {
        return Status(ErrorCodes::BadValue, "Should not call set() in this test");
    }

    Status setFromString(const std::string& str) {
        return Status(ErrorCodes::BadValue, "Should not call setFromString in this test");
    }

    Status validate(const BSONElement& newValueElement) const {
        return validateImpl(newValueElement);
    }

private:
    std::function<Status(const BSONElement& newValueElement)> validateImpl;
};

class DBClientMock : public DBClientService {
public:
    DBClientMock(std::function<StatusWith<bool>(BSONObj, BSONObj)> updateParameterOnDiskMock) {
        this->updateParameterOnDiskMockImpl = updateParameterOnDiskMock;
    }

    StatusWith<bool> updateParameterOnDisk(OperationContext* opCtx,
                                           BSONObj cmd,
                                           BSONObj info,
                                           const WriteConcernOptions&) override {
        return updateParameterOnDiskMockImpl(cmd, info);
    }

    Timestamp getUpdateClusterTime(OperationContext*) override {
        LogicalTime lt;
        return lt.asTimestamp();
    }

private:
    std::function<StatusWith<bool>(BSONObj, BSONObj)> updateParameterOnDiskMockImpl;
};

MockServerParameter alwaysValidatingServerParameter(StringData name) {

    MockServerParameter sp(name, [&](const BSONElement& newValueElement) { return Status::OK(); });

    return sp;
}

MockServerParameter alwaysInvalidatingServerParameter(StringData name) {

    MockServerParameter sp(name, [&](const BSONElement& newValueElement) {
        return Status(ErrorCodes::BadValue, "Parameter Validation Failed");
    });

    return sp;
}

DBClientMock alwaysSucceedingDbClient() {
    DBClientMock dbServiceMock([&](BSONObj cmd, BSONObj info) { return true; });

    return dbServiceMock;
}

DBClientMock alwaysFailingDbClient() {
    DBClientMock dbServiceMock([&](BSONObj cmd, BSONObj info) {
        return Status(ErrorCodes::UnknownError, "DB Client Update Failed");
    });

    return dbServiceMock;
}

// Tests
TEST(SetClusterParameterCommand, SucceedsWithObjectParameter) {

    MockServerParameter sp = alwaysValidatingServerParameter("Succeeds"_sd);
    DBClientMock dbServiceMock = alwaysSucceedingDbClient();

    auto serviceCtx = ServiceContext::make();
    auto client = serviceCtx->makeClient("SomeTest");

    auto mpsPtr = std::make_unique<MockParameterService>([&](StringData s) { return &sp; });

    Client* clientPtr = client.get();

    BSONObjBuilder testCmdBson;

    BSONObj subObj = BSON("ok"
                          << "hello_there");
    testCmdBson.append("testCmd"_sd, subObj);

    BSONObj obj = testCmdBson.obj();

    SetClusterParameterInvocation fixture(std::move(mpsPtr), dbServiceMock);

    OperationContext spyCtx(clientPtr, 1234);
    spyCtx.setWriteConcern(WriteConcernOptions::deserializerForIDL(BSON("w"
                                                                        << "majority")));
    SetClusterParameter testCmd(obj);

    fixture.invoke(&spyCtx, testCmd, boost::none, kMajorityWriteConcern);
}

TEST(SetClusterParameterCommand, ThrowsWithNonObjectParameter) {

    MockServerParameter sp = alwaysValidatingServerParameter("Succeeds"_sd);
    DBClientMock dbServiceMock = alwaysSucceedingDbClient();

    auto serviceCtx = ServiceContext::make();
    auto client = serviceCtx->makeClient("SomeTest");

    auto mpsPtr = std::make_unique<MockParameterService>([&](StringData s) { return &sp; });

    Client* clientPtr = client.get();

    BSONObjBuilder testCmdBson;
    testCmdBson << "testCommand" << 5;

    BSONObj obj = testCmdBson.obj();

    SetClusterParameterInvocation fixture(std::move(mpsPtr), dbServiceMock);

    OperationContext spyCtx(clientPtr, 1234);
    SetClusterParameter testCmd(obj);

    ASSERT_THROWS_CODE(fixture.invoke(&spyCtx, testCmd, boost::none, kMajorityWriteConcern),
                       DBException,
                       ErrorCodes::IllegalOperation);
}

TEST(SetClusterParameterCommand, ThrowsWhenServerParameterValidationFails) {

    MockServerParameter sp =
        alwaysInvalidatingServerParameter("CommandFailsWhenServerParameterValidationFails"_sd);
    DBClientMock dbServiceMock = alwaysSucceedingDbClient();

    auto serviceCtx = ServiceContext::make();
    auto client = serviceCtx->makeClient("SomeTest");

    auto mpsPtr = std::make_unique<MockParameterService>([&](StringData s) { return &sp; });

    Client* clientPtr = client.get();

    BSONObjBuilder testCmdBson;
    testCmdBson << "testCommand"
                << BSON("ok"
                        << "someval");

    BSONObj obj = testCmdBson.obj();

    SetClusterParameterInvocation fixture(std::move(mpsPtr), dbServiceMock);

    OperationContext spyCtx(clientPtr, 1234);
    SetClusterParameter testCmd(obj);

    ASSERT_THROWS_CODE_AND_WHAT(
        fixture.invoke(&spyCtx, testCmd, boost::none, kMajorityWriteConcern),
        DBException,
        ErrorCodes::BadValue,
        "Parameter Validation Failed"_sd);
}

TEST(SetClusterParameterCommand, ThrowsWhenDBUpdateFails) {

    MockServerParameter sp = alwaysValidatingServerParameter("CommandFailsWhenDBUpdateFails"_sd);
    DBClientMock dbServiceMock = alwaysFailingDbClient();

    auto serviceCtx = ServiceContext::make();
    auto client = serviceCtx->makeClient("SomeTest");

    auto mpsPtr = std::make_unique<MockParameterService>([&](StringData s) { return &sp; });

    Client* clientPtr = client.get();

    BSONObjBuilder testCmdBson;
    testCmdBson << "testCommand"
                << BSON("ok"
                        << "someval");

    BSONObj obj = testCmdBson.obj();

    SetClusterParameterInvocation fixture(std::move(mpsPtr), dbServiceMock);

    OperationContext spyCtx(clientPtr, 1234);

    SetClusterParameter testCmd(obj);

    ASSERT_THROWS_WHAT(fixture.invoke(&spyCtx, testCmd, boost::none, kMajorityWriteConcern),
                       DBException,
                       "DB Client Update Failed"_sd);
}

TEST(SetClusterParameterCommand, ThrowsWhenParameterNotPresent) {

    DBClientMock dbServiceMock = alwaysSucceedingDbClient();

    auto serviceCtx = ServiceContext::make();
    auto client = serviceCtx->makeClient("SomeTest");

    auto mpsPtr = std::make_unique<MockParameterService>([&](StringData s) {
        return ServerParameterSet::getClusterParameterSet()->get("doesNotExistParam"_sd);
    });

    Client* clientPtr = client.get();

    BSONObjBuilder testCmdBson;
    testCmdBson << "testCommand"
                << BSON("ok"
                        << "someval");

    BSONObj obj = testCmdBson.obj();

    SetClusterParameterInvocation fixture(std::move(mpsPtr), dbServiceMock);

    OperationContext spyCtx(clientPtr, 1234);

    SetClusterParameter testCmd(obj);

    ASSERT_THROWS_CODE(fixture.invoke(&spyCtx, testCmd, boost::none, kMajorityWriteConcern),
                       DBException,
                       ErrorCodes::NoSuchKey);
}
}  // namespace
}  // namespace mongo