package software.amazon.datasync.task;

import software.amazon.awssdk.services.datasync.DataSyncClient;
import software.amazon.awssdk.services.datasync.model.DataSyncException;
import software.amazon.awssdk.services.datasync.model.DescribeTaskRequest;
import software.amazon.awssdk.services.datasync.model.DescribeTaskResponse;
import software.amazon.awssdk.services.datasync.model.InternalException;
import software.amazon.awssdk.services.datasync.model.InvalidRequestException;
import software.amazon.cloudformation.exceptions.CfnNotFoundException;
import software.amazon.cloudformation.exceptions.CfnServiceInternalErrorException;
import software.amazon.cloudformation.proxy.AmazonWebServicesClientProxy;
import software.amazon.cloudformation.proxy.Logger;
import software.amazon.cloudformation.proxy.ProgressEvent;
import software.amazon.cloudformation.proxy.OperationStatus;
import software.amazon.cloudformation.proxy.ResourceHandlerRequest;

import java.util.Set;
import java.util.stream.Collectors;

public class ReadHandler extends BaseHandler<CallbackContext> {
    private static final String AWS_CFN_TAG_PREFIX = "aws:cloudformation:";

    @Override
    public ProgressEvent<ResourceModel, CallbackContext> handleRequest(
        final AmazonWebServicesClientProxy proxy,
        final ResourceHandlerRequest<ResourceModel> request,
        final CallbackContext callbackContext,
        final Logger logger) {

        final ResourceModel model = request.getDesiredResourceState();
        final DataSyncClient client = ClientBuilder.getClient();

        final DescribeTaskRequest describeTaskRequest = Translator.translateToReadRequest(model.getTaskArn());

        DescribeTaskResponse response;
        try {
            response = proxy.injectCredentialsAndInvokeV2(describeTaskRequest, client::describeTask);
        } catch (InvalidRequestException e) {
            throw new CfnNotFoundException(ResourceModel.TYPE_NAME, model.getTaskArn());
        } catch (InternalException e) {
            throw new CfnServiceInternalErrorException(e.getMessage(), e.getCause());
        } catch (DataSyncException e) {
            throw Translator.translateDataSyncExceptionToCfnException(e);
        }

        // Current tags are not supplied by the Describe call and must be retrieved separately
        final Set<Tag> allTags = TagRequestMaker.listTagsForResource(proxy, client, model.getTaskArn());
        final Set<Tag> userTags = allTags.stream()
                .filter(tag -> !tag.getKey().startsWith(AWS_CFN_TAG_PREFIX)) // Filter our system tags on the user tags
                .collect(Collectors.toSet());


        ResourceModel returnModel = ResourceModel.builder()
                .cloudWatchLogGroupArn(response.cloudWatchLogGroupArn())
                .taskArn(response.taskArn())
                .destinationLocationArn(response.destinationLocationArn())
                .errorCode(response.errorCode())
                .errorDetail(response.errorDetail())
                .status(response.statusAsString())
                .excludes(Translator.translateToResourceModelFilterRules(response.excludes()))
                .includes(Translator.translateToResourceModelFilterRules(response.includes()))
                .name(response.name())
                .options(Translator.translateToResourceModelOptions(response.options()))
                .schedule(Translator.translateToResourceModelTaskSchedule(response.schedule()))
                .sourceLocationArn(response.sourceLocationArn())
                .sourceNetworkInterfaceArns(response.sourceNetworkInterfaceArns())
                .destinationNetworkInterfaceArns(response.destinationNetworkInterfaceArns())
                .tags(userTags)
                .build();

        return ProgressEvent.<ResourceModel, CallbackContext>builder()
            .resourceModel(returnModel)
            .status(OperationStatus.SUCCESS)
            .build();
    }
}