package software.amazon.logs.destination;

import org.assertj.core.api.Assertions;
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.Mock;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;
import software.amazon.awssdk.services.cloudwatchlogs.CloudWatchLogsClient;
import software.amazon.awssdk.services.cloudwatchlogs.model.DescribeDestinationsRequest;
import software.amazon.awssdk.services.cloudwatchlogs.model.DescribeDestinationsResponse;
import software.amazon.awssdk.services.cloudwatchlogs.model.Destination;
import software.amazon.awssdk.services.cloudwatchlogs.model.InvalidParameterException;
import software.amazon.cloudformation.exceptions.CfnInvalidRequestException;
import software.amazon.cloudformation.exceptions.CfnNotFoundException;
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 java.time.Duration;
import java.util.Collections;

import static org.junit.jupiter.api.Assertions.assertThrows;

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

    @Mock
    private CloudWatchLogsClient sdkClient;

    private AmazonWebServicesClientProxy proxy;

    private ProxyClient<CloudWatchLogsClient> proxyClient;

    private ResourceModel testResourceModel;

    private ReadHandler handler;

    @BeforeEach
    public void setup() {
        proxy = new AmazonWebServicesClientProxy(logger, MOCK_CREDENTIALS, () -> Duration.ofSeconds(600)
                .toMillis());
        proxyClient = MOCK_PROXY(proxy, sdkClient);
        testResourceModel = getTestResourceModel();
        handler = new ReadHandler();
    }

    @Test
    public void handleRequest_Should_ReturnSuccess_When_DestinationFound() {
        final Destination destination = getTestDestination();

        final DescribeDestinationsResponse describeResponse = DescribeDestinationsResponse.builder()
                .destinations(destination)
                .build();

        Mockito.when(proxyClient.client()
                .describeDestinations(ArgumentMatchers.any(DescribeDestinationsRequest.class)))
                .thenReturn(describeResponse);

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

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

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

    @Test
    public void handleRequest_Should_ThrowCfnNotFoundException_When_DestinationsIsEmpty() {
        final DescribeDestinationsResponse describeResponse = DescribeDestinationsResponse.builder()
                .destinations(Collections.emptyList())
                .build();

        Mockito.when(proxyClient.client()
                .describeDestinations(ArgumentMatchers.any(DescribeDestinationsRequest.class)))
                .thenReturn(describeResponse);

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

        Assertions.assertThatThrownBy(
                () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger))
                .isInstanceOf(CfnNotFoundException.class);
    }

    @Test
    public void handleRequest_Should_ThrowCfnNotFoundException_When_ResponseIsNull() {
        final DescribeDestinationsResponse describeResponse = DescribeDestinationsResponse.builder()
                .build();
        Mockito.when(proxyClient.client()
                .describeDestinations(ArgumentMatchers.any(DescribeDestinationsRequest.class)))
                .thenReturn(describeResponse);

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

        Assertions.assertThatThrownBy(
                () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger))
                .isInstanceOf(CfnNotFoundException.class);
    }

    @Test
    public void handleRequest_Should_ThrowCfnInvalidRequestException__When_InvalidDestinationIsPassed() {
        Mockito.when(proxyClient.client()
                .describeDestinations(ArgumentMatchers.any(DescribeDestinationsRequest.class)))
                .thenThrow(InvalidParameterException.class);

        final ResourceHandlerRequest<ResourceModel> request =
                ResourceHandlerRequest.<ResourceModel>builder().desiredResourceState(testResourceModel)
                        .build();
        assertThrows(CfnInvalidRequestException.class,
                () -> handler.handleRequest(proxy, request, new CallbackContext(), proxyClient, logger));
    }

}