package software.amazon.timestream.database;

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.cloudformation.exceptions.CfnGeneralServiceException;
import software.amazon.cloudformation.exceptions.CfnInternalFailureException;
import software.amazon.cloudformation.exceptions.CfnInvalidRequestException;
import software.amazon.cloudformation.exceptions.CfnNotFoundException;
import software.amazon.cloudformation.exceptions.CfnResourceConflictException;
import software.amazon.cloudformation.proxy.AmazonWebServicesClientProxy;
import software.amazon.cloudformation.proxy.Logger;
import software.amazon.cloudformation.proxy.OperationStatus;
import software.amazon.cloudformation.proxy.ProgressEvent;
import software.amazon.cloudformation.proxy.ResourceHandlerRequest;

import com.amazonaws.services.timestreamwrite.model.ConflictException;
import com.amazonaws.services.timestreamwrite.model.DeleteDatabaseRequest;
import com.amazonaws.services.timestreamwrite.model.DescribeEndpointsRequest;
import com.amazonaws.services.timestreamwrite.model.DescribeEndpointsResult;
import com.amazonaws.services.timestreamwrite.model.Endpoint;
import com.amazonaws.services.timestreamwrite.model.InternalServerException;
import com.amazonaws.services.timestreamwrite.model.InvalidEndpointException;
import com.amazonaws.services.timestreamwrite.model.ResourceNotFoundException;
import com.amazonaws.services.timestreamwrite.model.ValidationException;

import java.util.function.Function;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;

@ExtendWith(MockitoExtension.class)
public class DeleteHandlerTest {

    @Mock
    private AmazonWebServicesClientProxy proxy;

    @Mock
    private Logger logger;

    private final DeleteHandler handler = new DeleteHandler();

    @BeforeEach
    public void setup() {
        proxy = mock(AmazonWebServicesClientProxy.class);
        doReturn(new DescribeEndpointsResult().withEndpoints(new Endpoint().withAddress("endpoint")))
                .when(proxy).injectCredentialsAndInvoke(any(DescribeEndpointsRequest.class), any(Function.class));
        logger = mock(Logger.class);
    }

    @Test
    public void deleteDatabaseShouldSucceed() {
        final ResourceHandlerRequest<ResourceModel> request = givenAResourceHandlerRequest();

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

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

        final DeleteDatabaseRequest expectedDeleteDatabaseRequest =
                new DeleteDatabaseRequest().withDatabaseName("TestDatabaseName");
        verify(proxy).injectCredentialsAndInvoke(eq(expectedDeleteDatabaseRequest), any(Function.class));
    }

    /*
     * Tests for error handling.
     */
    @Test
    public void deleteDatabaseShouldThrowWhenResourceInUse() {
        final ResourceHandlerRequest<ResourceModel> request = givenAResourceHandlerRequest();

        doThrow(new ConflictException("Test exception"))
                .when(proxy).injectCredentialsAndInvoke(any(DeleteDatabaseRequest.class), any(Function.class));

        assertThrows(
                CfnResourceConflictException.class,
                () -> handler.handleRequest(proxy, request, null, logger));
    }

    @Test
    public void deleteDatabaseShouldThrowWhenResourceNotFound() {
        final ResourceHandlerRequest<ResourceModel> request = givenAResourceHandlerRequest();

        doThrow(new ResourceNotFoundException("Test exception"))
                .when(proxy).injectCredentialsAndInvoke(any(DeleteDatabaseRequest.class), any(Function.class));

        assertThrows(
                CfnNotFoundException.class,
                () -> handler.handleRequest(proxy, request, null, logger));
    }

    @Test
    public void deleteDatabaseShouldThrowWhenInvalidRequest() {
        final ResourceHandlerRequest<ResourceModel> request = givenAResourceHandlerRequest();

        doThrow(new ValidationException("Test exception"))
                .when(proxy).injectCredentialsAndInvoke(any(DeleteDatabaseRequest.class), any(Function.class));

        assertThrows(
                CfnInvalidRequestException.class,
                () -> handler.handleRequest(proxy, request, null, logger));
    }

    @Test
    public void deleteDatabaseShouldThrowWhenServiceUnavailable() {
        final ResourceHandlerRequest<ResourceModel> request = givenAResourceHandlerRequest();

        doThrow(new InternalServerException("Test exception"))
                .when(proxy).injectCredentialsAndInvoke(any(DeleteDatabaseRequest.class), any(Function.class));

        assertThrows(
                CfnInternalFailureException.class,
                () -> handler.handleRequest(proxy, request, null, logger));
    }

    @Test
    public void deleteDatabaseShouldThrowWhenInvalidEndpointException() {
        final ResourceHandlerRequest<ResourceModel> request = givenAResourceHandlerRequest();

        doThrow(new InvalidEndpointException("Test exception"))
                .when(proxy).injectCredentialsAndInvoke(any(DeleteDatabaseRequest.class), any(Function.class));

        assertThrows(
                CfnInvalidRequestException.class,
                () -> handler.handleRequest(proxy, request, null, logger));
    }

    private ResourceHandlerRequest<ResourceModel> givenAResourceHandlerRequest() {
        final ResourceModel model =
                ResourceModel.builder()
                        .databaseName("TestDatabaseName")
                        .build();

        return ResourceHandlerRequest.<ResourceModel>builder()
                .desiredResourceState(model)
                .build();
    }
}