/*
 * Copyright (c) 2016 EMC
 * All Rights Reserved
 */
package com.emc.sa.service.vipr.application;

import java.net.URI;
import java.util.List;

import com.emc.sa.engine.bind.Param;
import com.emc.sa.engine.service.Service;
import com.emc.sa.service.ServiceParams;
import com.emc.sa.service.vipr.ViPRService;
import com.emc.sa.service.vipr.application.tasks.CreateCloneOfApplication;
import com.emc.sa.service.vipr.block.BlockStorageUtils;
import com.emc.storageos.db.client.model.uimodels.RetainedReplica;
import com.emc.storageos.model.DataObjectRestRep;
import com.emc.storageos.model.block.NamedVolumesList;
import com.emc.storageos.model.block.VolumeDeleteTypeEnum;
import com.emc.storageos.services.util.TimeUtils;
import com.emc.vipr.client.Tasks;

@Service("CreateCloneOfApplication")
public class CreateCloneOfApplicationService extends ViPRService {

    @Param(ServiceParams.APPLICATION)
    private URI applicationId;

    @Param(ServiceParams.APPLICATION_COPY_SETS)
    private String name;

    @Param(value = ServiceParams.APPLICATION_SITE, required = false)
    private String virtualArrayId;

    @Param(ServiceParams.APPLICATION_SUB_GROUP)
    protected List<String> subGroups;

    @Override
    public void execute() throws Exception {
        NamedVolumesList volumesToUse = BlockStorageUtils.getVolumesBySite(getClient(), virtualArrayId, applicationId);

        List<URI> volumeIds = BlockStorageUtils.getSingleVolumePerSubGroupAndStorageSystem(volumesToUse, subGroups);

        checkAndPurgeObsoleteClones(applicationId);
        String cloneName = TimeUtils.formatDateForCurrent(name);
        Tasks<? extends DataObjectRestRep> tasks = execute(
                new CreateCloneOfApplication(applicationId, cloneName, volumeIds));
        addAffectedResources(tasks);
        
        addRetainedReplicas(applicationId, cloneName);
    }
    
    /**
     * Check retention policy and delete obsolete snapshots if necessary
     * 
     * @param applicationId - application id
     */
    private void checkAndPurgeObsoleteClones(URI applicationId) {
        if (!isRetentionRequired()) {
            return;
        }
        List<RetainedReplica> replicas = findObsoleteReplica(applicationId.toString());
        for (RetainedReplica replica : replicas) {
            for (String replicaName: replica.getAssociatedReplicaIds()) {
                info("Delete clones %s since it exceeds max number of clones allowed", replicaName);
                removeApplicationFullCopy(applicationId, replicaName, subGroups);
            }
            getModelClient().delete(replica);
        }
    }
    
    private void removeApplicationFullCopy(URI applicationId, String name, List<String> subGroups) {
        List<URI> fullCopyIds = BlockStorageUtils.getSingleFullCopyPerSubGroupAndStorageSystem(applicationId, name,
                subGroups);
        List<URI> allFullCopyIds = BlockStorageUtils.getAllFullCopyVolumes(applicationId, name, subGroups);
        BlockStorageUtils.detachFullCopies(fullCopyIds);
        BlockStorageUtils.removeBlockResources(allFullCopyIds, VolumeDeleteTypeEnum.FULL);
    }
}