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.GetLicenseRequest;
import software.amazon.awssdk.services.licensemanager.model.GetLicenseResponse;
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.CfnInvalidRequestException;
import software.amazon.cloudformation.exceptions.CfnNotFoundException;
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;

import static software.amazon.awssdk.services.licensemanager.model.LicenseStatus.DELETED;
import static software.amazon.awssdk.services.licensemanager.model.LicenseStatus.PENDING_DELETE;

public class ReadHandler 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 model = request.getDesiredResourceState();

        // 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

        // STEP 1 [initialize a proxy context]
        return proxy.initiate("AWS-LicenseManager-License::Read", proxyClient, request.getDesiredResourceState(), callbackContext)

            // STEP 2 [TODO: construct a body of a request]
            .translateToServiceRequest(Translator::getLicenseRequest)

            .makeServiceCall((awsRequest, sdkProxyClient) -> readResource(awsRequest, sdkProxyClient , model))

            // STEP 4 [TODO: gather all properties of the resource]
            // Implement client invocation of the read request through the proxyClient, which is already initialised with
            // caller credentials, correct region and retry settings
            .done(awsResponse -> ProgressEvent.defaultSuccessHandler(Translator.translateFromReadResponse(awsResponse)));
    }

    private GetLicenseResponse readResource(
            final GetLicenseRequest getLicenseRequest,
            final ProxyClient<LicenseManagerClient> proxyClient,
            final ResourceModel model) {
        GetLicenseResponse getLicenseResponse = null;
        try {
            getLicenseResponse = proxyClient.injectCredentialsAndInvokeV2(getLicenseRequest, proxyClient.client()::getLicense);
            model.setLicenseArn(getLicenseResponse.license().licenseArn());

        } catch (ValidationException | InvalidParameterValueException e) {
            logger.log("Resource reading failed");
            throw new CfnNotFoundException(model.getLicenseArn(), ResourceModel.TYPE_NAME, e);
        } catch (final AwsServiceException e) {
            logger.log("Resource reading failed");
            throw new CfnGeneralServiceException(ResourceModel.TYPE_NAME + e.getMessage(), e);
        }

        if (DELETED.equals(getLicenseResponse.license().status().toString())
                || PENDING_DELETE.equals(getLicenseResponse.license().status().toString())) {
            throw new CfnNotFoundException(model.getLicenseArn(), ResourceModel.TYPE_NAME);
        }

        logger.log(String.format("%s has successfully been read.", ResourceModel.TYPE_NAME));
        return getLicenseResponse;
    }

}