package software.amazon.ec2.flowlog;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.ArgumentMatchers;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

import software.amazon.awssdk.services.ec2.Ec2Client;
import software.amazon.awssdk.services.ec2.model.CreateFlowLogsRequest;
import software.amazon.awssdk.services.ec2.model.CreateFlowLogsResponse;
import software.amazon.awssdk.services.ec2.model.DescribeFlowLogsRequest;
import software.amazon.awssdk.services.ec2.model.DescribeFlowLogsResponse;
import software.amazon.awssdk.services.ec2.model.UnsuccessfulItem;
import software.amazon.awssdk.services.ec2.model.UnsuccessfulItemError;
import software.amazon.cloudformation.proxy.AmazonWebServicesClientProxy;
import software.amazon.cloudformation.proxy.HandlerErrorCode;
import software.amazon.cloudformation.proxy.Logger;
import software.amazon.cloudformation.proxy.OperationStatus;
import software.amazon.cloudformation.proxy.ProgressEvent;
import software.amazon.cloudformation.proxy.ProxyClient;
import software.amazon.cloudformation.proxy.ResourceHandlerRequest;

@ExtendWith(MockitoExtension.class)
public class CreateHandlerTest extends TestBase {

    @Mock
    private AmazonWebServicesClientProxy proxy;

    @Mock
    private ProxyClient<Ec2Client> proxyClient;

    @Mock
    private Ec2Client ec2Client;

    @Mock
    private Logger logger;

    @BeforeEach
    public void setup() {
        doReturn(ec2Client).when(proxyClient).client();
    }

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

        final CreateFlowLogsResponse createFlowLogsResponse = CreateFlowLogsResponse.builder()
            .unsuccessful(Collections.emptyList())
            .flowLogIds(TEST_FLOW_LOG_TO_S3.flowLogId())
            .build();

        doReturn(createFlowLogsResponse)
            .when(proxy)
            .injectCredentialsAndInvokeV2(
                ArgumentMatchers.any(CreateFlowLogsRequest.class),
                ArgumentMatchers.any()
            );

        final DescribeFlowLogsResponse describeFlowLogsResponse = DescribeFlowLogsResponse.builder()
            .flowLogs(TEST_FLOW_LOG_TO_S3)
            .build();

        doReturn(describeFlowLogsResponse)
            .when(proxy)
            .injectCredentialsAndInvokeV2(
                ArgumentMatchers.any(DescribeFlowLogsRequest.class),
                ArgumentMatchers.any()
            );

        final Map<String, String> desiredResourceTags = new HashMap<String, String>() {{
            put("stack-name", "test-stack");
        }};
        final List<software.amazon.awssdk.services.ec2.model.Tag> desiredSdkTags = Arrays.asList(
            software.amazon.awssdk.services.ec2.model.Tag.builder()
                .key("stack-name")
                .value("test-stack")
                .build()
        );

        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
            .desiredResourceState(Translator.createModelFromFlowLog(TEST_FLOW_LOG_TO_S3))
            .desiredResourceTags(desiredResourceTags)
            .build();

        final ArgumentCaptor<CreateFlowLogsRequest> requestCaptor = ArgumentCaptor.forClass(CreateFlowLogsRequest.class);

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, request, null, proxyClient, logger);

        Mockito.verify(proxy, Mockito.atLeastOnce()).injectCredentialsAndInvokeV2(requestCaptor.capture(), ArgumentMatchers.any());
        final CreateFlowLogsRequest capturedRequest = requestCaptor.getAllValues().get(0);
        assertThat(capturedRequest.tagSpecifications().get(0).tags()).isEqualTo(desiredSdkTags);

        assertThat(response).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.SUCCESS);
        assertThat(response.getCallbackContext()).isNull();
        assertThat(response.getCallbackDelaySeconds()).isEqualTo(0);
        assertThat(response.getResourceModel()).isEqualTo(Translator.createModelFromFlowLog(TEST_FLOW_LOG_TO_S3));
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNull();
        assertThat(response.getErrorCode()).isNull();
        assertThat(response.getNextToken()).isNull();
    }

    @Test
    public void handleRequest_Unsuccessful() {
        final CreateHandler handler = new CreateHandler();

        final CreateFlowLogsResponse createFlowLogsResponse = CreateFlowLogsResponse.builder()
            .unsuccessful(UnsuccessfulItem.builder()
                .error(UnsuccessfulItemError.builder()
                    .code("InternalError")
                    .message("InternalError")
                    .build())
                .build())
            .build();

        doReturn(createFlowLogsResponse)
            .when(proxy)
            .injectCredentialsAndInvokeV2(
                ArgumentMatchers.any(),
                ArgumentMatchers.any()
            );

        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
            .desiredResourceState(ResourceModel.builder().build())
            .build();

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, request, null, proxyClient, logger);

        assertThat(response).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.FAILED);
        assertThat(response.getCallbackContext()).isNull();
        assertThat(response.getCallbackDelaySeconds()).isEqualTo(0);
        assertThat(response.getResourceModel()).isNull();
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNotNull();
        assertThat(response.getErrorCode()).isEqualTo(HandlerErrorCode.GeneralServiceException);
        assertThat(response.getNextToken()).isNull();
    }

    @Test
    public void handleRequest_TooManyFlowLogIds() {
        final CreateHandler handler = new CreateHandler();

        final CreateFlowLogsResponse createFlowLogsResponse = CreateFlowLogsResponse.builder()
            .unsuccessful(Collections.emptyList())
            .flowLogIds("fl-0", "fl-1")
            .build();

        doReturn(createFlowLogsResponse)
            .when(proxy)
            .injectCredentialsAndInvokeV2(
                ArgumentMatchers.any(),
                ArgumentMatchers.any()
            );

        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
            .desiredResourceState(ResourceModel.builder().build())
            .build();

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, request, null, proxyClient, logger);

        assertThat(response).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.FAILED);
        assertThat(response.getCallbackContext()).isNull();
        assertThat(response.getCallbackDelaySeconds()).isEqualTo(0);
        assertThat(response.getResourceModel()).isNull();
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNotNull();
        assertThat(response.getErrorCode()).isEqualTo(HandlerErrorCode.InternalFailure);
        assertThat(response.getNextToken()).isNull();
    }

    @Test
    public void handleRequest_SimpleError() {
        final CreateHandler handler = new CreateHandler();

        doThrow(SERVICE_UNAVAILABLE_ERROR)
            .when(proxy)
            .injectCredentialsAndInvokeV2(
                ArgumentMatchers.any(),
                ArgumentMatchers.any()
            );

        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
            .desiredResourceState(ResourceModel.builder().build())
            .build();

        final ProgressEvent<ResourceModel, CallbackContext> response = handler.handleRequest(proxy, request, null, proxyClient, logger);

        assertThat(response).isNotNull();
        assertThat(response.getStatus()).isEqualTo(OperationStatus.FAILED);
        assertThat(response.getCallbackContext()).isNull();
        assertThat(response.getCallbackDelaySeconds()).isEqualTo(0);
        assertThat(response.getResourceModel()).isNull();
        assertThat(response.getResourceModels()).isNull();
        assertThat(response.getMessage()).isNotNull();
        assertThat(response.getErrorCode()).isEqualTo(HandlerErrorCode.ServiceInternalError);
        assertThat(response.getNextToken()).isNull();
    }

}