package software.amazon.licensemanager.license;

import software.amazon.awssdk.services.licensemanager.LicenseManagerClient;
import software.amazon.awssdk.services.licensemanager.model.AccessDeniedException;
import software.amazon.awssdk.services.licensemanager.model.CreateLicenseRequest;
import software.amazon.awssdk.services.licensemanager.model.CreateLicenseResponse;
import software.amazon.awssdk.services.licensemanager.model.GetLicenseResponse;
import software.amazon.awssdk.services.licensemanager.model.InvalidParameterValueException;
import software.amazon.awssdk.services.licensemanager.model.InvalidResourceStateException;
import software.amazon.awssdk.services.licensemanager.model.ResourceLimitExceededException;
import software.amazon.awssdk.services.licensemanager.model.ValidationException;
import software.amazon.cloudformation.exceptions.CfnAccessDeniedException;
import software.amazon.cloudformation.exceptions.CfnInvalidRequestException;
import software.amazon.cloudformation.exceptions.CfnResourceConflictException;
import software.amazon.cloudformation.exceptions.CfnServiceLimitExceededException;
import software.amazon.cloudformation.proxy.AmazonWebServicesClientProxy;
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 CreateHandler 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;
        final ResourceModel resourceModel = request.getDesiredResourceState();

        // Make sure the user isn't trying to assign values to readOnly properties
        if (hasReadOnlyProperties(resourceModel)) {
            throw new CfnInvalidRequestException("Attempting to set a ReadOnly Property.");
        }

        // 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(resourceModel, callbackContext)
            // STEP 2 [create/stabilize progress chain - required for resource creation]
            .then(progress ->
                // If your service API throws 'ResourceAlreadyExistsException' for create requests then CreateHandler can return just proxy.initiate construction
                // STEP 2.0 [initialize a proxy context]
                // Implement client invocation of the create request through the proxyClient, which is already initialised with
                // caller credentials, correct region and retry settings
                proxy.initiate("AWS-LicenseManager-License::Create", proxyClient, resourceModel, callbackContext)

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

                    // STEP 2.2 [TODO: make an api call]
                    .makeServiceCall((awsRequest, client) -> createLicense(progress, client, awsRequest, resourceModel, request))

                    // STEP 2.3 [TODO: stabilize step is not necessarily required but typically involves describing the resource until it is in a certain status, though it can take many forms]
                    // for more information -> https://docs.aws.amazon.com/cloudformation-cli/latest/userguide/resource-type-test-contract.html
                    // If your resource requires some form of stabilization (e.g. service does not provide strong consistency), you will need to ensure that your code
                    // accounts for any potential issues, so that a subsequent read/update requests will not cause any conflicts (e.g. NotFoundException/InvalidRequestException)
                    .stabilize((awsRequest, awsResponse, client, model, context) -> stabilizedOnCreate(model, awsResponse, client))
                    .progress()
                )

            // STEP 3 [TODO: describe call/chain to return the resource model]
            .then(progress -> new ReadHandler().handleRequest(proxy, request, callbackContext, proxyClient, logger));
    }

    private boolean hasReadOnlyProperties(final ResourceModel model) {
        return false;
    }

    private CreateLicenseResponse createLicense(
            ProgressEvent<ResourceModel, CallbackContext> progress,
            ProxyClient<LicenseManagerClient> client,
            CreateLicenseRequest awsRequest,
            ResourceModel model,
            ResourceHandlerRequest<ResourceModel> request) {

        CreateLicenseResponse createLicenseResponse;
        try {
            createLicenseResponse = client.injectCredentialsAndInvokeV2(
                    awsRequest, client.client()::createLicense);
        } catch (final ValidationException | InvalidParameterValueException e) {
            logger.log(e.getMessage());
            throw new CfnInvalidRequestException(String.format("Couldn't create %s due to error: %s", ResourceModel.TYPE_NAME, e.getMessage()), e);
        } catch (final AccessDeniedException e) {
            logger.log(e.getMessage());
            throw new CfnAccessDeniedException(ResourceModel.TYPE_NAME, e);
        } catch (final ResourceLimitExceededException e) {
            logger.log(e.getMessage());
            throw new CfnServiceLimitExceededException(e);
        } catch (final InvalidResourceStateException e) {
            logger.log(e.getMessage());
            throw new CfnResourceConflictException(e);
        }

        logger.log(
                String.format("%s [%s] successfully created.",
                        ResourceModel.TYPE_NAME,
                        createLicenseResponse.licenseArn()
                )
        );
        return createLicenseResponse;
    }

    private boolean stabilizedOnCreate(
            final ResourceModel model,
            final CreateLicenseResponse awsResponse,
            final ProxyClient<LicenseManagerClient> proxyClient) {
        try {
            model.setLicenseArn(awsResponse.licenseArn());
            final GetLicenseResponse response =  proxyClient.injectCredentialsAndInvokeV2(
                    Translator.getLicenseRequest(model), proxyClient.client()::getLicense);
            if(response.license() != null)
            {
                return true;
            }
            return false;
        } catch (final AccessDeniedException e) {
            logger.log(e.getMessage());
            throw new CfnAccessDeniedException(ResourceModel.TYPE_NAME, e);
        } catch (final InvalidParameterValueException e) {
            logger.log(e.getMessage());
            throw new CfnInvalidRequestException(ResourceModel.TYPE_NAME, e);
        }
    }

}