/*-
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2019-2020 Nordix Foundation.
 *  Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed 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 under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.models.provider.impl;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.ws.rs.core.Response;

import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.common.utils.resources.ResourceUtils;
import org.onap.policy.models.base.PfModelException;
import org.onap.policy.models.base.PfModelRuntimeException;
import org.onap.policy.models.pdp.concepts.Pdp;
import org.onap.policy.models.pdp.concepts.PdpGroup;
import org.onap.policy.models.pdp.concepts.PdpGroupFilter;
import org.onap.policy.models.pdp.concepts.PdpStatistics;
import org.onap.policy.models.pdp.concepts.PdpSubGroup;
import org.onap.policy.models.provider.PolicyModelsProvider;
import org.onap.policy.models.provider.PolicyModelsProviderParameters;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyFilter;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyType;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeFilter;
import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
import org.onap.policy.models.tosca.legacy.concepts.LegacyOperationalPolicy;

/**
 * This class provides a dummy implementation of the Policy Models Provider for the ONAP Policy Framework.
 *
 * @author Liam Fallon (liam.fallon@est.tech)
 * @author Chenfei Gao (cgao@research.att.com)
 */
public class DummyPolicyModelsProviderImpl implements PolicyModelsProvider {
    /**
     * Constructor that takes the parameters.
     *
     * @param parameters the parameters for the provider
     */
    public DummyPolicyModelsProviderImpl(final PolicyModelsProviderParameters parameters) {
        // Default constructor
    }

    @Override
    public void init() throws PfModelException {
        // Not required on the dummy provider
    }

    @Override
    public void close() {
        // Not required on the dummy provider
    }

    @Override
    public ToscaServiceTemplate getPolicyTypes(final String name, final String version) throws PfModelException {
        return getDummyResponse("dummyimpl/DummyToscaPolicyTypeGetResponse.json");
    }

    @Override
    public List<ToscaPolicyType> getPolicyTypeList(final String name, final String version) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public ToscaServiceTemplate getFilteredPolicyTypes(ToscaPolicyTypeFilter filter) throws PfModelException {
        return getDummyResponse("dummyimpl/DummyToscaPolicyTypeGetResponse.json");
    }

    @Override
    public List<ToscaPolicyType> getFilteredPolicyTypeList(ToscaPolicyTypeFilter filter) {
        return new ArrayList<>();
    }

    @Override
    public ToscaServiceTemplate createPolicyTypes(final ToscaServiceTemplate serviceTemplate) throws PfModelException {
        return serviceTemplate;
    }

    @Override
    public ToscaServiceTemplate updatePolicyTypes(final ToscaServiceTemplate serviceTemplate) throws PfModelException {
        return serviceTemplate;
    }

    @Override
    public ToscaServiceTemplate deletePolicyType(final String name, final String version) throws PfModelException {
        return getDummyResponse("dummyimpl/DummyToscaPolicyTypeDeleteResponse.json");
    }

    @Override
    public ToscaServiceTemplate getPolicies(final String name, final String version) throws PfModelException {
        return getDummyResponse("dummyimpl/DummyToscaPolicyGetResponse.json");
    }

    @Override
    public List<ToscaPolicy> getPolicyList(final String name, final String version) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public ToscaServiceTemplate getFilteredPolicies(ToscaPolicyFilter filter) throws PfModelException {
        return getDummyResponse("dummyimpl/DummyToscaPolicyGetResponse.json");
    }

    @Override
    public List<ToscaPolicy> getFilteredPolicyList(ToscaPolicyFilter filter) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public ToscaServiceTemplate createPolicies(final ToscaServiceTemplate serviceTemplate) throws PfModelException {
        return serviceTemplate;
    }

    @Override
    public ToscaServiceTemplate updatePolicies(final ToscaServiceTemplate serviceTemplate) throws PfModelException {
        return serviceTemplate;
    }

    @Override
    public ToscaServiceTemplate deletePolicy(final String name, final String version) throws PfModelException {
        return getDummyResponse("dummyimpl/DummyToscaPolicyDeleteResponse.json");
    }

    @Override

    public LegacyOperationalPolicy getOperationalPolicy(final String policyId, final String policyVersion)
            throws PfModelException {
        return new LegacyOperationalPolicy();
    }

    @Override
    public LegacyOperationalPolicy createOperationalPolicy(final LegacyOperationalPolicy legacyOperationalPolicy)
            throws PfModelException {
        return legacyOperationalPolicy;
    }

    @Override
    public LegacyOperationalPolicy updateOperationalPolicy(final LegacyOperationalPolicy legacyOperationalPolicy)
            throws PfModelException {
        return legacyOperationalPolicy;
    }

    @Override
    public LegacyOperationalPolicy deleteOperationalPolicy(final String policyId, final String policyVersion)
            throws PfModelException {
        return new LegacyOperationalPolicy();
    }

    @Override
    public List<PdpGroup> getPdpGroups(final String name) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public List<PdpGroup> getFilteredPdpGroups(PdpGroupFilter filter) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public List<PdpGroup> createPdpGroups(final List<PdpGroup> pdpGroups) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public List<PdpGroup> updatePdpGroups(final List<PdpGroup> pdpGroups) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public void updatePdpSubGroup(final String pdpGroupName, final PdpSubGroup pdpSubGroup) throws PfModelException {
        // Not implemented
    }

    @Override
    public void updatePdp(String pdpGroupName, String pdpSubGroup, Pdp pdp) throws PfModelException {
        // Not implemented
    }

    @Override
    public PdpGroup deletePdpGroup(final String name) throws PfModelException {
        return null;
    }

    @Override
    public List<PdpStatistics> getPdpStatistics(final String name, final Date timestamp) throws PfModelException {
        return new ArrayList<>();
    }

    @Override
    public List<PdpStatistics> getFilteredPdpStatistics(String name, String pdpGroupName, String pdpSubGroup,
            Date startTimeStamp, Date endTimeStamp, String sortOrder, int getRecordNum) {
        // Not implemented
        return new ArrayList<>();
    }

    @Override
    public List<PdpStatistics> createPdpStatistics(final List<PdpStatistics> pdpStatisticsList)
            throws PfModelException {
        // Not implemented
        return new ArrayList<>();
    }

    @Override
    public List<PdpStatistics> updatePdpStatistics(final List<PdpStatistics> pdpStatisticsList)
            throws PfModelException {
        // Not implemented
        return new ArrayList<>();
    }

    @Override
    public List<PdpStatistics> deletePdpStatistics(final String name, final Date timestamp) {
        // Not implemented
        return new ArrayList<>();
    }

    /**
     * Return a ToscaServicetemplate dummy response.
     *
     * @param fileName the file name containing the dummy response
     * @return the ToscaServiceTemplate with the dummy response
     */
    protected ToscaServiceTemplate getDummyResponse(final String fileName) {
        StandardCoder standardCoder = new StandardCoder();
        ToscaServiceTemplate serviceTemplate;

        try {
            serviceTemplate =
                    standardCoder.decode(ResourceUtils.getResourceAsString(fileName), ToscaServiceTemplate.class);
            if (serviceTemplate == null) {
                throw new PfModelException(Response.Status.INTERNAL_SERVER_ERROR, "error reading specified file");
            }
        } catch (Exception exc) {
            throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR, "error serializing object", exc);
        }

        return serviceTemplate;
    }
}