package software.amazon.licensemanager.license;

import software.amazon.awssdk.awscore.exception.AwsServiceException;
import software.amazon.awssdk.services.licensemanager.LicenseManagerClient;
import software.amazon.awssdk.services.licensemanager.model.DeleteLicenseRequest;
import software.amazon.awssdk.services.licensemanager.model.DeleteLicenseResponse;
import software.amazon.awssdk.services.licensemanager.model.InvalidParameterValueException;
import software.amazon.awssdk.services.licensemanager.model.ValidationException;
import software.amazon.cloudformation.exceptions.CfnGeneralServiceException;
import software.amazon.cloudformation.exceptions.CfnNotFoundException;
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;

public class DeleteHandler extends BaseHandlerStd {
    private Logger logger;

    protected ProgressEvent<ResourceModel, CallbackContext> handleRequest(
        final AmazonWebServicesClientProxy proxy,
        final ResourceHandlerRequest<ResourceModel> request,
        final CallbackContext callbackContext,
        final ProxyClient<LicenseManagerClient> proxyClient,
        final Logger logger) {

        this.logger = logger;

        // TODO: Adjust Progress Chain according to your implementation
        // https://github.com/aws-cloudformation/cloudformation-cli-java-plugin/blob/master/src/main/java/software/amazon/cloudformation/proxy/CallChain.java

        return ProgressEvent.progress(request.getDesiredResourceState(), callbackContext)

            // STEP 1 [check if resource already exists]
            // for more information -> https://docs.aws.amazon.com/cloudformation-cli/latest/userguide/resource-type-test-contract.html
            // if target API does not support 'ResourceNotFoundException' then following check is required
            .then(progress ->
                    {
                        try {
                            ProgressEvent readHandlerResponse = new ReadHandler().handleRequest(proxy, request, callbackContext, proxyClient, logger);
                            request.getDesiredResourceState()
                                    .setSourceVersion(((ResourceModel) readHandlerResponse.getResourceModel()).getVersion());
                            return ProgressEvent.progress(request.getDesiredResourceState(), callbackContext);
                        } catch (final CfnNotFoundException e) {
                            logger.log(request.getDesiredResourceState().getPrimaryIdentifier()
                                    + " does not exist; Therefore, can not be deleted.");
                            return ProgressEvent.defaultFailureHandler(e, HandlerErrorCode.NotFound);
                        }
                    })

            // STEP 2.0 [delete/stabilize progress chain - required for resource deletion]
            .then(progress ->
                // If your service API throws 'ResourceNotFoundException' for delete requests then DeleteHandler can return just proxy.initiate construction
                // STEP 2.0 [initialize a proxy context]
                // Implement client invocation of the delete request through the proxyClient, which is already initialised with
                // caller credentials, correct region and retry settings
                proxy.initiate("AWS-LicenseManager-License::Delete", proxyClient, progress.getResourceModel(), progress.getCallbackContext())

                    // STEP 2.1 [TODO: construct a body of a request]
                    .translateToServiceRequest(Translator::translateToDeleteRequest)

                    // STEP 2.2 [TODO: make an api call]
                    .makeServiceCall((awsRequest, client) -> deleteResource(progress.getResourceModel(), awsRequest, client))
                        .done(awsResponse -> ProgressEvent.<ResourceModel, CallbackContext>builder()
                                .status(OperationStatus.SUCCESS)
                                .build()));
    }

    private DeleteLicenseResponse deleteResource(
            final ResourceModel model,
            final DeleteLicenseRequest deleteLicenseRequest,
            final ProxyClient<LicenseManagerClient> proxyClient) {
        DeleteLicenseResponse deleteLicenseResponse = null;
        try {

            deleteLicenseResponse = proxyClient.injectCredentialsAndInvokeV2(deleteLicenseRequest,
                    proxyClient.client()::deleteLicense);
        } catch (InvalidParameterValueException | ValidationException e) {
            logger.log("Resource deletion failed");
            throw new CfnNotFoundException(model.getLicenseArn(), ResourceModel.TYPE_NAME);
        } catch (final AwsServiceException e) {
            logger.log("Resource deletion failed");
            throw new CfnGeneralServiceException(ResourceModel.TYPE_NAME + e.getMessage(), e);
        }

        logger.log(String.format("%s successfully deleted.", ResourceModel.TYPE_NAME));
        return deleteLicenseResponse;
    }
}