/*-
 * ============LICENSE_START=======================================================
 * ONAP-PDP-REST
 * ================================================================================
 * Copyright (C) 2017 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.
 * ============LICENSE_END=========================================================
 */
package org.onap.policy.pdp.rest.api.services;

import java.util.Map;

import org.onap.policy.api.AttributeType;
import org.onap.policy.api.PolicyException;
import org.onap.policy.api.PolicyParameters;
import org.onap.policy.api.RuleProvider;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.xacml.api.XACMLErrorConstants;
import org.onap.policy.xacml.std.pap.StdPAPPolicy;
import org.onap.policy.xacml.std.pap.StdPAPPolicyParams;

/**
 * Decision Policy Implementation
 *
 * @version 0.1
 */
public class DecisionPolicyService {
    private static Logger LOGGER = FlexLogger.getLogger(DecisionPolicyService.class.getName());
    private static PAPServices papServices = null;

    private String message = null;
    private String policyScope = null;
    private String policyName = null;
    private PolicyParameters policyParameters = null;
    private String onapName = null;

    public DecisionPolicyService(String policyScope, String policyName,
                                 PolicyParameters policyParameters) {
        this.policyScope = policyScope;
        this.policyName = policyName;
        this.policyParameters = policyParameters;
        papServices = new PAPServices();
    }

    public Boolean getValidation() {
        onapName = policyParameters.getOnapName();
        if (onapName == null || onapName.trim().isEmpty()) {
            message = XACMLErrorConstants.ERROR_DATA_ISSUE + "No ONAP Name given.";
            return false;
        }
        return true;
    }

    public String getMessage() {
        return message;
    }

    public String getResult(boolean updateFlag) throws PolicyException {
        String response = null;
        String operation = null;
        if (updateFlag) {
            operation = "update";
        } else {
            operation = "create";
        }
        RuleProvider ruleProvider = policyParameters.getRuleProvider();
        if (ruleProvider == null) {
            ruleProvider = RuleProvider.CUSTOM;
        }
        Map<String, String> matchingAttributes = null;
        Map<String, String> settingsAttributes = null;

        //Get the MATCHING and/or SETTINGS attributes
        if (policyParameters.getAttributes() != null &&
                policyParameters.getAttributes().containsKey(AttributeType.MATCHING) &&
                policyParameters.getAttributes().containsKey(AttributeType.SETTINGS)) {
            matchingAttributes = policyParameters.getAttributes().get(AttributeType.MATCHING);
            settingsAttributes = policyParameters.getAttributes().get(AttributeType.SETTINGS);
        } else if (policyParameters.getAttributes() != null &&
                !policyParameters.getAttributes().containsKey(AttributeType.MATCHING) &&
                policyParameters.getAttributes().containsKey(AttributeType.SETTINGS)) {
            settingsAttributes = policyParameters.getAttributes().get(AttributeType.SETTINGS);
        } else if (policyParameters.getAttributes() != null &&
                policyParameters.getAttributes().containsKey(AttributeType.MATCHING) &&
                !policyParameters.getAttributes().containsKey(AttributeType.SETTINGS)) {
            matchingAttributes = policyParameters.getAttributes().get(AttributeType.MATCHING);
        }
        // Create StdPAPPolicy object used to send policy data to PAP-REST.
        StdPAPPolicy newPAPPolicy = new StdPAPPolicy(StdPAPPolicyParams.builder()
                .policyName(policyName)
                .description(policyParameters.getPolicyDescription())
                .onapName(onapName)
                .providerComboBox(ruleProvider.toString())
                .dyanamicFieldConfigAttributes(matchingAttributes)
                .dynamicSettingsMap(settingsAttributes)
                .treatments(policyParameters.getTreatments())
                .dynamicRuleAlgorithmLabels(policyParameters.getDynamicRuleAlgorithmLabels())
                .dynamicRuleAlgorithmCombo(policyParameters.getDynamicRuleAlgorithmFunctions())
                .dynamicRuleAlgorithmField1(policyParameters.getDynamicRuleAlgorithmField1())
                .dynamicRuleAlgorithmField2(policyParameters.getDynamicRuleAlgorithmField2())
                .editPolicy(updateFlag)
                .domain(policyScope)
                .highestVersion(0)
                .build());
        // Send JSON to PAP.
        response = (String) papServices.callPAP(newPAPPolicy, new String[]{"operation=" + operation, "apiflag=api",
                "policyType=Decision"}, policyParameters.getRequestID(), "Decision");
        LOGGER.info(message);
        return response;
    }

}