package software.amazon.rds.dbparametergroup;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.atLeastOnce;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;

import java.time.Duration;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import software.amazon.awssdk.services.rds.RdsClient;
import software.amazon.awssdk.services.rds.model.AddTagsToResourceRequest;
import software.amazon.awssdk.services.rds.model.AddTagsToResourceResponse;
import software.amazon.awssdk.services.rds.model.DBParameterGroup;
import software.amazon.awssdk.services.rds.model.DescribeDbParameterGroupsRequest;
import software.amazon.awssdk.services.rds.model.DescribeDbParameterGroupsResponse;
import software.amazon.awssdk.services.rds.model.DescribeEngineDefaultParametersRequest;
import software.amazon.awssdk.services.rds.model.ListTagsForResourceRequest;
import software.amazon.awssdk.services.rds.model.ListTagsForResourceResponse;
import software.amazon.awssdk.services.rds.model.ModifyDbParameterGroupRequest;
import software.amazon.awssdk.services.rds.model.ModifyDbParameterGroupResponse;
import software.amazon.awssdk.services.rds.model.ResetDbParameterGroupRequest;
import software.amazon.cloudformation.proxy.AmazonWebServicesClientProxy;
import software.amazon.cloudformation.proxy.OperationStatus;
import software.amazon.cloudformation.proxy.ProgressEvent;
import software.amazon.cloudformation.proxy.ProxyClient;
import software.amazon.cloudformation.proxy.ResourceHandlerRequest;
import software.amazon.rds.test.common.core.HandlerName;
import software.amazon.rds.test.common.verification.AccessPermissionAlias;
import software.amazon.rds.test.common.verification.AccessPermissionFactory;

@ExtendWith(MockitoExtension.class)
public class UpdateHandlerTest extends AbstractTestBase {

    @Mock
    RdsClient rdsClient;

    @Captor
    ArgumentCaptor<ResetDbParameterGroupRequest> captor;

    @Mock
    private AmazonWebServicesClientProxy proxy;

    @Mock
    private ProxyClient<RdsClient> proxyRdsClient;

    private DBParameterGroup simpleDbParameterGroup;
    private ResourceModel previousResourceModel;

    private ResourceHandlerRequest<ResourceModel> sameParamsRequest;
    private ResourceHandlerRequest<ResourceModel> updateParamsRequest;

    @Override
    public HandlerName getHandlerName() {
        return HandlerName.UPDATE;
    }

    @BeforeEach
    public void setup() {
        proxy = new AmazonWebServicesClientProxy(logger, MOCK_CREDENTIALS, () -> Duration.ofSeconds(600).toMillis());
        rdsClient = mock(RdsClient.class);
        proxyRdsClient = MOCK_PROXY(proxy, rdsClient);

        simpleDbParameterGroup = DBParameterGroup.builder()
                .dbParameterGroupArn("arn").build();

        previousResourceModel = ResourceModel.builder()
                .parameters(null)
                .build();

        sameParamsRequest = ResourceHandlerRequest.<ResourceModel>builder()
                .clientRequestToken(getClientRequestToken())
                .desiredResourceState(RESOURCE_MODEL)
                .previousResourceState(RESOURCE_MODEL)
                .desiredResourceTags(translateTagsToMap(TAG_SET))
                .logicalResourceIdentifier(LOGICAL_RESOURCE_IDENTIFIER)
                .build();

        updateParamsRequest = ResourceHandlerRequest.<ResourceModel>builder()
                .clientRequestToken(getClientRequestToken())
                .desiredResourceState(RESOURCE_MODEL)
                .previousResourceState(previousResourceModel)
                .desiredResourceTags(translateTagsToMap(TAG_SET))
                .logicalResourceIdentifier(LOGICAL_RESOURCE_IDENTIFIER)
                .build();
    }

    @AfterEach
    public void tear_down() {
        verify(rdsClient, atLeastOnce()).serviceName();
        verifyNoMoreInteractions(rdsClient);
        verifyAccessPermissions(
                rdsClient,
                new AccessPermissionAlias(
                        AccessPermissionFactory.fromString("rds:DescribeEngineDefaultParametersPaginator"),
                        AccessPermissionFactory.fromString("rds:DescribeEngineDefaultParameters")
                ),
                new AccessPermissionAlias(
                        AccessPermissionFactory.fromString("rds:DescribeDBParametersPaginator"),
                        AccessPermissionFactory.fromString("rds:DescribeDBParameters")
                )
        );
    }

    @Test
    public void handleRequest_SimpleSuccess() {
        final UpdateHandler handler = new UpdateHandler();

        CallbackContext callbackContext = new CallbackContext();
        callbackContext.setParametersApplied(true);

        when(rdsClient.describeDBParameterGroups(any(DescribeDbParameterGroupsRequest.class)))
                .thenReturn(DescribeDbParameterGroupsResponse.builder().dbParameterGroups(simpleDbParameterGroup).build());

        when(rdsClient.listTagsForResource(any(ListTagsForResourceRequest.class)))
                .thenReturn(ListTagsForResourceResponse.builder().build());

        when(rdsClient.addTagsToResource(any(AddTagsToResourceRequest.class)))
                .thenReturn(AddTagsToResourceResponse.builder().build());

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, proxyRdsClient, updateParamsRequest, callbackContext, EMPTY_REQUEST_LOGGER);

        assertThat(response).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.SUCCESS);
        assertThat(response.getCallbackDelaySeconds()).isEqualTo(0);
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNull();
        assertThat(response.getErrorCode()).isNull();

        verify(proxyRdsClient.client(), times(1)).describeDBParameterGroups(any(DescribeDbParameterGroupsRequest.class));
        verify(proxyRdsClient.client(), times(1)).listTagsForResource(any(ListTagsForResourceRequest.class));
        verify(proxyRdsClient.client()).addTagsToResource(any(AddTagsToResourceRequest.class));
    }

    @Test
    public void handleRequest_SimpleSuccessWithApplyParameters() {
        final UpdateHandler handler = new UpdateHandler();

        CallbackContext callbackContext = new CallbackContext();
        callbackContext.setParametersApplied(true);

        when(rdsClient.describeDBParameterGroups(any(DescribeDbParameterGroupsRequest.class)))
                .thenReturn(DescribeDbParameterGroupsResponse.builder().dbParameterGroups(simpleDbParameterGroup).build());

        when(rdsClient.listTagsForResource(any(ListTagsForResourceRequest.class)))
                .thenReturn(ListTagsForResourceResponse.builder().build());

        mockDescribeDbParametersResponse(proxyRdsClient, "static", "dynamic", true, true, false);

        when(rdsClient.modifyDBParameterGroup(any(ModifyDbParameterGroupRequest.class)))
                .thenReturn(ModifyDbParameterGroupResponse.builder().build());

        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
                .clientRequestToken(getClientRequestToken())
                .previousResourceState(previousResourceModel)
                .desiredResourceState(RESET_RESOURCE_MODEL)
                .logicalResourceIdentifier(LOGICAL_RESOURCE_IDENTIFIER).build();

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, proxyRdsClient, request, new CallbackContext(), EMPTY_REQUEST_LOGGER);

        assertThat(response).isNotNull();
        assertThat(response.getCallbackContext()).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.SUCCESS);
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNull();
        assertThat(response.getErrorCode()).isNull();

        verify(rdsClient).resetDBParameterGroup(captor.capture());
        assertThat(captor.getValue().parameters()
                .stream().parallel()
                .filter(parameter -> parameter.parameterName().equals("param1")).findAny().get()
                .applyMethod().toString().equals("pending-reboot")).isTrue();
        verify(rdsClient).describeEngineDefaultParameters(any(DescribeEngineDefaultParametersRequest.class));
    }

    @Test
    public void handleRequest_SimpleSuccessSameParams() {
        final UpdateHandler handler = new UpdateHandler();

        CallbackContext callbackContext = new CallbackContext();
        callbackContext.setParametersApplied(true);

        when(rdsClient.describeDBParameterGroups(any(DescribeDbParameterGroupsRequest.class)))
                .thenReturn(DescribeDbParameterGroupsResponse.builder().dbParameterGroups(simpleDbParameterGroup).build());

        when(rdsClient.listTagsForResource(any(ListTagsForResourceRequest.class)))
                .thenReturn(ListTagsForResourceResponse.builder().build());

        when(rdsClient.addTagsToResource(any(AddTagsToResourceRequest.class)))
                .thenReturn(AddTagsToResourceResponse.builder().build());

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, proxyRdsClient, sameParamsRequest, callbackContext, EMPTY_REQUEST_LOGGER);

        assertThat(response).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.SUCCESS);
        assertThat(response.getCallbackDelaySeconds()).isEqualTo(0);
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNull();
        assertThat(response.getErrorCode()).isNull();

        verify(proxyRdsClient.client(), times(1)).describeDBParameterGroups(any(DescribeDbParameterGroupsRequest.class));
        verify(proxyRdsClient.client(), times(1)).listTagsForResource(any(ListTagsForResourceRequest.class));
        verify(proxyRdsClient.client()).addTagsToResource(any(AddTagsToResourceRequest.class));
    }
}