/*-
 * ============LICENSE_START=======================================================
 * ONAP-PAP-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.pap.xacml.rest.handler;

import java.io.IOException;
import java.util.HashMap;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.ParserConfigurationException;

import org.onap.policy.common.logging.eelf.PolicyLogger;
import org.onap.policy.pap.xacml.rest.XACMLPapServlet;
import org.onap.policy.pap.xacml.rest.policycontroller.PolicyCreation;
import org.onap.policy.rest.adapter.PolicyRestAdapter;
import org.onap.policy.utils.PolicyUtils;
import org.onap.policy.xacml.api.XACMLErrorConstants;
import org.onap.policy.xacml.std.pap.StdPAPPolicy;
import org.xml.sax.SAXException;

import com.att.research.xacml.util.XACMLProperties;

public class SavePolicyHandler {
	private HashMap<String, String> ErrorHeaders = null;
	
	public void doPolicyAPIPut(HttpServletRequest request, HttpServletResponse response) throws IOException {
		String operation = request.getParameter("operation");
		String policyType = request.getParameter("policyType");
		String apiflag = request.getParameter("apiflag");
		PolicyCreation creation = new PolicyCreation();
        if ( policyType != null ) {
			PolicyRestAdapter policyAdapter = new PolicyRestAdapter();
			if("update".equalsIgnoreCase(operation)){
				policyAdapter.setEditPolicy(true);
			}else{
				policyAdapter.setEditPolicy(false);
			}
			
			// get the request content into a String
			String json = null;
			// read the inputStream into a buffer (trick found online scans entire input looking for end-of-file)
			java.util.Scanner scanner = new java.util.Scanner(request.getInputStream());
			scanner.useDelimiter("\\A");
			json =  scanner.hasNext() ? scanner.next() : "";
			scanner.close();
			PolicyLogger.info("JSON request from API: " + json);
			// convert Object sent as JSON into local object
			StdPAPPolicy policy = PolicyUtils.jsonStringToObject(json, StdPAPPolicy.class);
			//Set policyAdapter values including parentPath (Common to all policy types)
			try {
                policyAdapter = setDataToPolicyAdapter(policy, policyType, apiflag);
                
                if(!extendedPolicyOptions(policyAdapter, response)){
                	creation.savePolicy(policyAdapter, response);
                }
                if ("update".equalsIgnoreCase(operation)) {
					response.addHeader("operation",  "update");
				} else {
					response.addHeader("operation", "create");
				}
			} catch (Exception e1) {
				PolicyLogger.error(XACMLErrorConstants.ERROR_UNKNOWN + 
						"Could not set data to policy adapter "+ e1.getMessage());
			}
        }
	}

	private PolicyRestAdapter setDataToPolicyAdapter(StdPAPPolicy policy, String policyType, String apiflag) throws ParserConfigurationException, ServletException, SAXException, IOException{
		PolicyRestAdapter policyAdapter = new PolicyRestAdapter();
		policyAdapter.setApiflag(apiflag);
		/*
		 * set policy adapter values for Building JSON object containing policy data
		 */
		//Common among policy types
		policyAdapter.setPolicyName(policy.getPolicyName());
		policyAdapter.setPolicyDescription(policy.getPolicyDescription());
		policyAdapter.setOnapName(policy.getOnapName()); //Config Base and Decision Policies
		policyAdapter.setRuleCombiningAlgId("urn:oasis:names:tc:xacml:3.0:rule-combining-algorithm:permit-overrides");
	
		policyAdapter.setPolicyType(policyType);
		policyAdapter.setDynamicFieldConfigAttributes(policy.getDynamicFieldConfigAttributes());
		policyAdapter.setEditPolicy(policy.isEditPolicy());
		policyAdapter.setEntityManagerFactory(XACMLPapServlet.getEmf());
		//Config Specific
		policyAdapter.setConfigName(policy.getConfigName());  //Base and Firewall
		policyAdapter.setConfigBodyData(policy.getConfigBodyData()); //Base
		policyAdapter.setConfigType((policy.getConfigType()!=null) ? policy.getConfigType().toUpperCase(): null);  //Base
		policyAdapter.setJsonBody(policy.getJsonBody()); //Firewall, ClosedLoop
		policyAdapter.setConfigPolicyType(policy.getConfigPolicyType());
		policyAdapter.setDraft(policy.isDraft()); //ClosedLoop_Fault
		policyAdapter.setServiceType(policy.getServiceType()); //ClosedLoop_PM
		policyAdapter.setUuid(policy.getUuid()); //Micro Service
		policyAdapter.setLocation(policy.getMsLocation()); //Micro Service
		policyAdapter.setPriority(policy.getPriority()); //Micro Service
		policyAdapter.setPolicyScope(policy.getDomainDir());
		policyAdapter.setRiskType(policy.getRiskType()); //Safe Policy Attributes
		policyAdapter.setRiskLevel(policy.getRiskLevel());//Safe Policy Attributes
		policyAdapter.setGuard(policy.getGuard());//Safe Policy Attributes
		policyAdapter.setTtlDate(policy.getTTLDate());//Safe Policy Attributes
		policyAdapter.setBrmsParamBody(policy.getDrlRuleAndUIParams());
        policyAdapter.setBrmsDependency(policy.getBrmsDependency()); // BRMS Policies.
        policyAdapter.setBrmsController(policy.getBrmsController()); // BRMS Policies.
		//Action Policy Specific
		policyAdapter.setActionAttribute(policy.getActionAttribute());  //comboDictValue
		policyAdapter.setActionPerformer(policy.getActionPerformer());
		policyAdapter.setDynamicRuleAlgorithmLabels(policy.getDynamicRuleAlgorithmLabels());
		policyAdapter.setDynamicRuleAlgorithmCombo(policy.getDynamicRuleAlgorithmCombo());
		policyAdapter.setDynamicRuleAlgorithmField1(policy.getDynamicRuleAlgorithmField1());
		policyAdapter.setDynamicRuleAlgorithmField2(policy.getDynamicRuleAlgorithmField2());
		//Decision Policy Specific
		policyAdapter.setDynamicSettingsMap(policy.getDynamicSettingsMap());
		policyAdapter.setRuleProvider(policy.getProviderComboBox());
		policyAdapter.setDomainDir(policyAdapter.getPolicyScope());
		policyAdapter.setDomain(policyAdapter.getPolicyScope());
		return policyAdapter;
	}
	
	public boolean extendedPolicyOptions(PolicyRestAdapter policyAdapter, HttpServletResponse response){
		return false;
	}
	
	public void addErrorHeader(String key, String value){
		if(ErrorHeaders==null){
			ErrorHeaders= new HashMap<>();
		}
		ErrorHeaders.put(key, value);
	}

	public static SavePolicyHandler getInstance() {
		try {
			Class<?> savePolicyHandler = Class.forName(XACMLProperties.getProperty("savePolicy.impl.className", SavePolicyHandler.class.getName()));
			SavePolicyHandler instance = (SavePolicyHandler) savePolicyHandler.newInstance(); 
			return instance;
		} catch (Exception e) {
			PolicyLogger.error(e.getMessage());
		}
		return null;
	}
}