/*-
 * ============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 javax.json.JsonException;
import javax.json.JsonObject;

import org.onap.policy.api.PolicyException;
import org.onap.policy.api.PolicyParameters;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.pdp.rest.api.utils.PolicyApiUtils;
import org.onap.policy.xacml.api.XACMLErrorConstants;
import org.onap.policy.xacml.std.pap.StdPAPPolicy;

/**
 * Firewall Policy Implementation. 
 * 
 * @version 0.1
 */
public class FirewallPolicyService {
	private static final Logger LOGGER = FlexLogger.getLogger(FirewallPolicyService.class.getName());
	
	private  PAPServices papServices = null;
	private PolicyParameters policyParameters = null;
	private String message = null;
	private String policyName = null;
	private String policyScope = null;
	private String date = null;
	private JsonObject firewallJson = null;
	
	public FirewallPolicyService(String policyName, String policyScope,
			PolicyParameters policyParameters, String date) {
		this.policyParameters = policyParameters;
		this.policyName = policyName;
		this.policyScope = policyScope;
		this.date = date;
		papServices = new PAPServices();
	}

	public Boolean getValidation() {
		if(policyParameters.getConfigBody()==null){
			message = XACMLErrorConstants.ERROR_DATA_ISSUE+ "No Config Body given.";
			return false;
		}
		try{
			firewallJson = PolicyApiUtils.stringToJsonObject(policyParameters.getConfigBody());
		} catch(JsonException| IllegalStateException e){
			message = XACMLErrorConstants.ERROR_DATA_ISSUE+ " improper JSON object : " + policyParameters.getConfigBody();
			LOGGER.error("Error while parsing JSON body for creating Firewall Policy " , e);
			return false;
		}
		if(firewallJson==null|| firewallJson.isEmpty()){
			message = XACMLErrorConstants.ERROR_DATA_ISSUE + "No Config-Body given.";
			return false;
		}
		boolean levelCheck = false;
		levelCheck = PolicyApiUtils.isNumeric(policyParameters.getRiskLevel());
		if (!levelCheck){
			message = XACMLErrorConstants.ERROR_DATA_ISSUE + "Incorrect Risk Level 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";
		}
		//set values for basic policy information
		if(!firewallJson.containsKey("configName")){
			message = XACMLErrorConstants.ERROR_DATA_ISSUE + "No configName given in firwall JSON.";
			LOGGER.error(message);
			return message;
		}
		String configName = firewallJson.get("configName").toString();
		String configDescription = "";
		String json = firewallJson.toString();
		// Create Policy. 
		StdPAPPolicy newPAPPolicy = new StdPAPPolicy("Firewall Config", policyName, configDescription, configName, updateFlag, policyScope, json, 0, 
				policyParameters.getRiskLevel(),policyParameters.getRiskType(), String.valueOf(policyParameters.getGuard()), date);
		// Send Json to PAP. 
		response = (String) papServices.callPAP(newPAPPolicy, new String[] {"operation="+operation, "apiflag=api", "policyType=Config"}, policyParameters.getRequestID(), "ConfigFirewall");
		LOGGER.info(response);
		return response;
	}

}