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// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
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package org.apache.cloudstack.api.command.admin.direct.download;

import com.cloud.exception.ConcurrentOperationException;
import com.cloud.exception.InsufficientCapacityException;
import com.cloud.exception.NetworkRuleConflictException;
import com.cloud.exception.ResourceAllocationException;
import com.cloud.exception.ResourceUnavailableException;
import org.apache.cloudstack.acl.RoleType;
import org.apache.cloudstack.api.APICommand;
import org.apache.cloudstack.api.ApiConstants;
import org.apache.cloudstack.api.ApiErrorCode;
import org.apache.cloudstack.api.BaseCmd;
import org.apache.cloudstack.api.Parameter;
import org.apache.cloudstack.api.ServerApiException;
import org.apache.cloudstack.api.response.DirectDownloadCertificateResponse;
import org.apache.cloudstack.api.response.HostResponse;
import org.apache.cloudstack.api.response.ListResponse;
import org.apache.cloudstack.api.response.DirectDownloadCertificateHostStatusResponse;
import org.apache.cloudstack.api.response.ZoneResponse;
import org.apache.cloudstack.context.CallContext;
import org.apache.cloudstack.direct.download.DirectDownloadCertificate;
import org.apache.cloudstack.direct.download.DirectDownloadManager;
import org.apache.cloudstack.direct.download.DirectDownloadManager.HostCertificateStatus;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;

import javax.inject.Inject;
import java.util.ArrayList;
import java.util.List;

@APICommand(name = RevokeTemplateDirectDownloadCertificateCmd.APINAME,
        description = "Revoke a direct download certificate from hosts in a zone",
        responseObject = DirectDownloadCertificateHostStatusResponse.class,
        since = "4.13",
        authorized = {RoleType.Admin})
public class RevokeTemplateDirectDownloadCertificateCmd extends BaseCmd {

    @Inject
    DirectDownloadManager directDownloadManager;

    private static final Logger LOG = Logger.getLogger(RevokeTemplateDirectDownloadCertificateCmd.class);
    public static final String APINAME = "revokeTemplateDirectDownloadCertificate";

    @Parameter(name = ApiConstants.ID, type = CommandType.UUID,
            entityType = DirectDownloadCertificateResponse.class,
            description = "id of the certificate")
    private Long certificateId;

    @Parameter(name = ApiConstants.NAME, type = BaseCmd.CommandType.STRING,
            description = "(optional) alias of the SSL certificate")
    private String certificateAlias;

    @Parameter(name = ApiConstants.HYPERVISOR, type = BaseCmd.CommandType.STRING,
            description = "(optional) hypervisor type")
    private String hypervisor;

    @Parameter(name = ApiConstants.ZONE_ID, type = CommandType.UUID, entityType = ZoneResponse.class,
            description = "(optional) zone to revoke certificate", required = true)
    private Long zoneId;

    @Parameter(name = ApiConstants.HOST_ID, type = CommandType.UUID, entityType = HostResponse.class,
            description = "(optional) the host ID to revoke certificate")
    private Long hostId;

    private void createResponse(final List<HostCertificateStatus> hostsRevokeStatusList) {
        final ListResponse<DirectDownloadCertificateHostStatusResponse> response = new ListResponse<>();
        final List<DirectDownloadCertificateHostStatusResponse> responses = new ArrayList<>();
        for (final HostCertificateStatus status : hostsRevokeStatusList) {
            if (status == null) {
                continue;
            }
            DirectDownloadCertificateHostStatusResponse revokeResponse =
                    _responseGenerator.createDirectDownloadCertificateHostStatusResponse(status);
            responses.add(revokeResponse);
        }
        response.setResponses(responses);
        response.setResponseName(getCommandName());
        setResponseObject(response);
    }

    private void validateParameters() {
        if (ObjectUtils.allNull(certificateId, certificateAlias, hypervisor) ||
                certificateId == null && !ObjectUtils.allNotNull(certificateAlias, hypervisor)) {
            throw new ServerApiException(ApiErrorCode.PARAM_ERROR, "Please specify the hypervisor and the" +
                    "certificate name to revoke or the certificate ID");
        }
        if (StringUtils.isNotBlank(hypervisor) && !hypervisor.equalsIgnoreCase("kvm")) {
            throw new ServerApiException(ApiErrorCode.PARAM_ERROR, "Currently supporting KVM hosts only");
        }
    }

    @Override
    public void execute() throws ResourceUnavailableException, InsufficientCapacityException, ServerApiException, ConcurrentOperationException, ResourceAllocationException, NetworkRuleConflictException {
        validateParameters();
        try {
            DirectDownloadCertificate certificate = directDownloadManager.findDirectDownloadCertificateByIdOrHypervisorAndAlias(certificateId, certificateAlias, hypervisor, zoneId);
            List<HostCertificateStatus> hostsResult = directDownloadManager.revokeCertificate(certificate, zoneId, hostId);
            createResponse(hostsResult);
        } catch (Exception e) {
            throw new ServerApiException(ApiErrorCode.INTERNAL_ERROR, "Failed revoking certificate: " + e.getMessage());
        }
    }

    @Override
    public String getCommandName() {
        return APINAME.toLowerCase() + BaseCmd.RESPONSE_SUFFIX;
    }

    @Override
    public long getEntityOwnerId() {
        return CallContext.current().getCallingAccount().getId();
    }
}