package software.amazon.ssmincidents.responseplan;

import software.amazon.awssdk.awscore.AwsResponse;
import software.amazon.awssdk.services.ssmincidents.SsmIncidentsClient;
import software.amazon.awssdk.services.ssmincidents.model.ResourceNotFoundException;
import software.amazon.cloudformation.proxy.AmazonWebServicesClientProxy;
import software.amazon.cloudformation.proxy.HandlerErrorCode;
import software.amazon.cloudformation.proxy.Logger;
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<SsmIncidentsClient> proxyClient,
        final Logger logger) {

        this.logger = logger;

        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 ->
                // STEP 1.0 [initialize a proxy context]
                // If your service API does not return ResourceNotFoundException on delete requests against some identifier (e.g; resource Name)
                // and instead returns a 200 even though a resource already deleted, you must first check if the resource exists here
                // NOTE: If your service API throws 'ResourceNotFoundException' for delete requests this method is not necessary
                proxy.initiate("AWS-SSMIncidents-ResponsePlan::Delete::PreDeletionCheck", proxyClient, progress.getResourceModel(), progress.getCallbackContext())
                    // STEP 1.1 [initialize a proxy context]
                    .translateToServiceRequest(Translator::translateToReadRequest)
                    .makeServiceCall((awsRequest, client) -> {
                        AwsResponse awsResponse = null;
                        awsResponse = client.injectCredentialsAndInvokeV2(awsRequest, proxyClient.client()::getResponsePlan);
                        logger.log(String.format("%s has successfully been read.", ResourceModel.TYPE_NAME));
                        return awsResponse;
                    })
                    .handleError((awsRequest, exception, client, model, context) -> {
                        if (exception instanceof ResourceNotFoundException)
                            return ProgressEvent.failed(model, context, HandlerErrorCode.NotFound, "Not Found");
                        throw Translator.handleException(exception);
                    })
                    .progress()
            )
            .then(progress ->
                proxy.initiate("AWS-SSMIncidents-ResponsePlan::Delete", proxyClient, progress.getResourceModel(),
                        progress.getCallbackContext())
                    .translateToServiceRequest(Translator::translateToDeleteRequest)
                    .makeServiceCall((awsRequest, client) -> {
                        AwsResponse awsResponse = null;
                        try {
                            awsResponse = client
                                .injectCredentialsAndInvokeV2(awsRequest, proxyClient.client()::deleteResponsePlan);
                        } catch (final Exception e) {
                            throw Translator.handleException(e);
                        }

                        logger.log(String.format("%s successfully deleted.", ResourceModel.TYPE_NAME));
                        return awsResponse;
                    })
                    .progress()
            )
            .then(progress -> ProgressEvent.defaultSuccessHandler(null));
    }
}