package software.amazon.sns.subscription;

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.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import software.amazon.awssdk.services.sns.SnsClient;
import software.amazon.awssdk.services.sns.model.*;
import software.amazon.cloudformation.exceptions.*;
import software.amazon.cloudformation.proxy.*;

import java.time.Duration;
import java.util.HashMap;
import java.util.Map;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;

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

    @Mock
    private AmazonWebServicesClientProxy proxy;

    @Mock
    private ProxyClient<SnsClient> proxyClient;

    @Mock
    SnsClient snsClient;

    private DeleteHandler handler;
    private Map<String, String> attributes;
    private ResourceModel model;

    @BeforeEach
    public void setup() {
        handler = new DeleteHandler();
        proxy = new AmazonWebServicesClientProxy(logger, MOCK_CREDENTIALS, () -> Duration.ofSeconds(600).toMillis());
        snsClient = mock(SnsClient.class);
        proxyClient = MOCK_PROXY(proxy, snsClient);
        buildObjects();
    }

    @AfterEach
    public void tear_down() {
        verify(snsClient, atLeastOnce()).serviceName();
        verifyNoMoreInteractions(snsClient);
    }

    private void buildObjects() {

        model = ResourceModel.builder().subscriptionArn("testArn").topicArn("topicArn").build();
        attributes = new HashMap<>();
        attributes.put("SubscriptionArn", model.getSubscriptionArn());
        attributes.put("TopicArn", "topicArn");
        attributes.put("Protocol", "email");
        attributes.put("Endpoint", "end1");
        attributes.put("RawMessageDelivery", "false");
        attributes.put("PendingConfirmation", "false");
    }

    private HashMap<String, String> buildObjects_PendingTrue() {

        model = ResourceModel.builder().subscriptionArn("testArn").topicArn("topicArn").build();
        HashMap<String, String> attributes = new HashMap<>();
        attributes.put("SubscriptionArn", model.getSubscriptionArn());
        attributes.put("TopicArn", "topicArn");
        attributes.put("Protocol", "email");
        attributes.put("Endpoint", "end1");
        attributes.put("RawMessageDelivery", "false");
        attributes.put("PendingConfirmation", "true");

        return attributes;
    }

    @Test
    public void handleRequest_SimpleSuccess() {

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

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        final UnsubscribeResponse unsubscribeResponse = UnsubscribeResponse.builder().build();
        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenReturn(unsubscribeResponse);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

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

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

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
        verify(proxyClient.client()).unsubscribe(any(UnsubscribeRequest.class));
        verify(proxyClient.client(), times(2)).getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class));
    }

    @Test
    public void handleRequest_SubscriptionPending() {

        final HashMap<String, String> attributes = buildObjects_PendingTrue();

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

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse);

        assertThrows(CfnInvalidRequestException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));


        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
        verify(proxyClient.client(), never()).unsubscribe(any(UnsubscribeRequest.class));
    }


    @Test
    public void handleRequest_TopicArnDoesNotExist()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(NotFoundException.class);
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
                                                                .desiredResourceState(model)
                                                                .build();

        assertThrows(CfnNotFoundException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
        verify(proxyClient.client(), never()).unsubscribe(any(UnsubscribeRequest.class));
        verify(proxyClient.client(), never()).getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class));

    }

    @Test
    public void handleRequest_TopicArnSubscriptionLimitExceededException()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(SubscriptionLimitExceededException.class);


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

        assertThrows(CfnServiceLimitExceededException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
    }

    @Test
    public void handleRequest_TopicArnFilterPolicyLimitExceededException()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(FilterPolicyLimitExceededException.class);

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

        assertThrows(CfnServiceLimitExceededException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
    }

    @Test
    public void handleRequest_TopicArnInvalidParameterExceptionException()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(InvalidParameterException.class);


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

        assertThrows(CfnInvalidRequestException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
    }

    @Test
    public void handleRequest_TopicArnInternalErrorException()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(InternalErrorException.class);


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

        assertThrows(CfnInternalFailureException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
    }

    @Test
    public void handleRequest_TopicArnAuthorizationErrorException()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(AuthorizationErrorException.class);


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

        assertThrows(CfnAccessDeniedException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
    }

    @Test
    public void handleRequest_TopicArnInvalidSecurityException()  {

        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenThrow(InvalidSecurityException.class);


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

        assertThrows(CfnInvalidCredentialsException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
    }

    @Test
    public void handleRequest_SubscriptionDoesNotExist()  {

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn", "topicArn");

        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenThrow(NotFoundException.class);

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);


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

        assertThrows(CfnNotFoundException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

        verify(proxyClient.client()).getTopicAttributes(any(GetTopicAttributesRequest.class));
        verify(proxyClient.client(), never()).unsubscribe(any(UnsubscribeRequest.class));
        verify(proxyClient.client()).getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class));

    }


    @Test
    public void handleRequest_SubscriptionLimitExceededExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(SubscriptionLimitExceededException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnServiceLimitExceededException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }

    @Test
    public void handleRequest_FilterPolicyLimitExceededExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(FilterPolicyLimitExceededException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnServiceLimitExceededException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }

    @Test
    public void handleRequest_InvalidParameterExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(InvalidParameterException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnInvalidRequestException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }

    @Test
    public void handleRequest_InternalErrorExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(InternalErrorException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnInternalFailureException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }

    @Test
    public void handleRequest_AuthorizationErrorExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(AuthorizationErrorException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnAccessDeniedException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }

    @Test
    public void handleRequest_InvalidSecurityExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(InvalidSecurityException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnInvalidCredentialsException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }

    @Test
    public void handleRequest_NotFoundExceptionUnsubscribe()  {
        final ResourceHandlerRequest<ResourceModel> request = ResourceHandlerRequest.<ResourceModel>builder()
        .desiredResourceState(model)
        .build();

        final Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("TopicArn","topicarn");

        final GetTopicAttributesResponse getTopicAttributesResponse = GetTopicAttributesResponse.builder().attributes(topicAttributes).build();
        when(proxyClient.client().getTopicAttributes(any(GetTopicAttributesRequest.class))).thenReturn(getTopicAttributesResponse);

        when(proxyClient.client().unsubscribe(any(UnsubscribeRequest.class))).thenThrow(NotFoundException.class);

        final GetSubscriptionAttributesResponse getSubscriptionResponse = GetSubscriptionAttributesResponse.builder().attributes(attributes).build();
        when(proxyClient.client().getSubscriptionAttributes(any(GetSubscriptionAttributesRequest.class))).thenReturn(getSubscriptionResponse).thenReturn(getSubscriptionResponse);

        assertThrows(CfnNotFoundException.class, () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));

    }
}