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/*
 * ============LICENSE_START==========================================
 * org.onap.music
 * ===================================================================
 *  Copyright (c) 2017 AT&T Intellectual Property
 * ===================================================================
 *  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.music.rest;


import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import org.onap.music.datastore.PreparedQueryObject;
import org.onap.music.datastore.jsonobjects.JsonOnboard;
import org.onap.music.eelf.logging.EELFLoggerDelegate;
import org.onap.music.eelf.logging.format.AppMessages;
import org.onap.music.eelf.logging.format.ErrorSeverity;
import org.onap.music.eelf.logging.format.ErrorTypes;
import org.onap.music.main.CachingUtil;
import org.onap.music.main.MusicCore;
import org.onap.music.main.MusicUtil;
import org.onap.music.main.ResultType;

import com.datastax.driver.core.DataType;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

@Path("/v{version: [0-9]+}/admin")
// @Path("/admin")
@Api(value = "Admin Api", hidden = true)
public class RestMusicAdminAPI {
    private static EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(RestMusicAdminAPI.class);

    /*
     * API to onboard an application with MUSIC. This is the mandatory first step.
     * 
     */
    @POST
    @Path("/onboardAppWithMusic")
    @ApiOperation(value = "Onboard application", response = String.class)
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Map<String, Object> onboardAppWithMusic(JsonOnboard jsonObj,
                    @Context HttpServletResponse response) throws Exception {
        Map<String, Object> resultMap = new HashMap<>();
        String appName = jsonObj.getAppname();
        String userId = jsonObj.getUserId();
        String isAAF = jsonObj.getIsAAF();
        String password = jsonObj.getPassword();
        response.addHeader("X-latestVersion", MusicUtil.getVersion());
        if (appName == null || userId == null || isAAF == null || password == null) {
        	logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.MISSINGINFO  ,ErrorSeverity.CRITICAL, ErrorTypes.AUTHENTICATIONERROR);
            resultMap.put("Exception",
                            "Unauthorized: Please check the request parameters. Some of the required values appName(ns), userId, password, isAAF are missing.");
            response.setStatus(401);
            return resultMap;
        }

        PreparedQueryObject pQuery = new PreparedQueryObject();
        pQuery.appendQueryString(
                        "select uuid from admin.keyspace_master where application_name = ? allow filtering");
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), appName));
        ResultSet rs = MusicCore.get(pQuery);
        if (!rs.all().isEmpty()) {
            resultMap.put("Exception", "Application " + appName
                            + " has already been onboarded. Please contact admin.");
            return resultMap;
        }

        pQuery = new PreparedQueryObject();
        String uuid = CachingUtil.generateUUID();
        pQuery.appendQueryString(
                        "INSERT INTO admin.keyspace_master (uuid, keyspace_name, application_name, is_api, "
                                        + "password, username, is_aaf) VALUES (?,?,?,?,?,?,?)");
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(), uuid));
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(),
                        MusicUtil.DEFAULTKEYSPACENAME));
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), appName));
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.cboolean(), "True"));
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), password));
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), userId));
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.cboolean(), isAAF));

        String returnStr = MusicCore.eventualPut(pQuery).toString();
        if (returnStr.contains("Failure")) {
            resultMap.put("Exception",
                            "Oops. Something wrong with onboarding process. Please retry later or contact admin.");
            return resultMap;
        }
        CachingUtil.updateisAAFCache(appName, isAAF);
        resultMap.put("Success", "Your application " + appName + " has been onboarded with MUSIC.");
        resultMap.put("Generated AID", uuid);
        return resultMap;
    }
   
    
    @POST
    @Path("/search")
    @ApiOperation(value = "Search Onboard application", response = String.class)
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Map<String, Object> getOnboardedInfoSearch(
    				JsonOnboard jsonObj,
                    @Context HttpServletResponse response) throws Exception {
        Map<String, Object> resultMap = new HashMap<>();

        response.addHeader("X-latestVersion", MusicUtil.getVersion());
        String appName = jsonObj.getAppname();
        String uuid = jsonObj.getAid();
        String isAAF = jsonObj.getIsAAF();
        
        if (appName == null && uuid == null && isAAF == null) {
        	logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.MISSINGINFO  ,ErrorSeverity.CRITICAL, ErrorTypes.AUTHENTICATIONERROR);
            resultMap.put("Exception",
                            "Unauthorized: Please check the request parameters. Enter atleast one of the following parameters: appName(ns), aid, isAAF.");
            response.setStatus(401);
            return resultMap;
        }

        PreparedQueryObject pQuery = new PreparedQueryObject();
        String cql = "select uuid, keyspace_name from admin.keyspace_master where ";
        if (appName != null)
            cql = cql + "application_name = ? AND ";
        if (uuid != null)
            cql = cql + "uuid = ? AND ";
        if(isAAF != null)
        cql = cql + "is_aaf = ?";
        
        if(cql.endsWith("AND "))
        	cql = cql.trim().substring(0, cql.length()-4);
        System.out.println("Query is: "+cql);
        cql = cql + " allow filtering";
        System.out.println("Get OnboardingInfo CQL: " + cql);
        pQuery.appendQueryString(cql);
        if (appName != null)
            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), appName));
        if (uuid != null)
            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(), uuid));
        if (isAAF != null)
                pQuery.addValue(MusicUtil.convertToActualDataType(DataType.cboolean(), Boolean.parseBoolean(isAAF)));
        ResultSet rs = MusicCore.get(pQuery);
        Iterator<Row> it = rs.iterator();
        while (it.hasNext()) {
            Row row = (Row) it.next();
            resultMap.put( row.getUUID("uuid").toString(),row.getString("keyspace_name"));
        }
        if (resultMap.isEmpty()) {
            if(uuid != null)
                resultMap.put("Exception", "Please make sure Aid is correct and application is onboarded.");
            else {
                resultMap.put("Exception",
                               "Application is not onboarded. Please make sure all the information is correct.");
            }
        }
        return resultMap;
    }


    @DELETE
    @Path("/onboardAppWithMusic")
    @ApiOperation(value = "Delete Onboard application", response = String.class)
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Map<String, Object> deleteOnboardApp(JsonOnboard jsonObj,
                    @Context HttpServletResponse response) throws Exception {
        Map<String, Object> resultMap = new HashMap<>();
        response.addHeader("X-latestVersion", MusicUtil.getVersion());
        String appName = jsonObj.getAppname();
        String aid = jsonObj.getAid();
        PreparedQueryObject pQuery = new PreparedQueryObject();
        String consistency = MusicUtil.EVENTUAL;;
        if (appName == null && aid == null) {
        	logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.MISSINGINFO  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
            resultMap.put("Exception", "Please make sure either appName(ns) or Aid is present");
            response.setStatus(400);
            return resultMap;
        }
        if (aid != null) {
        		pQuery.appendQueryString("SELECT keyspace_name FROM admin.keyspace_master WHERE uuid = ?");
        		pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(),
                        UUID.fromString(aid)));
        		Row row = MusicCore.get(pQuery).one();
        		if(row!=null) {
	    			String ks = row.getString("keyspace_name");
	    			if (!ks.equals(MusicUtil.DEFAULTKEYSPACENAME)) {
	    				PreparedQueryObject queryObject = new PreparedQueryObject();
	    				queryObject.appendQueryString("DROP KEYSPACE IF EXISTS " + ks + ";");
	    				MusicCore.nonKeyRelatedPut(queryObject, consistency);
	    			}
        		}
        		pQuery = new PreparedQueryObject();
                pQuery.appendQueryString("delete from admin.keyspace_master where uuid = ? IF EXISTS");
                pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(),
                                UUID.fromString(aid)));
                ResultType result = MusicCore.nonKeyRelatedPut(pQuery, consistency);
                if (result==ResultType.SUCCESS) {
    	            resultMap.put("Success", "Your application has been deleted successfully");
    	        } else {
    	            resultMap.put("Exception","Oops. Spomething went wrong. Please make sure Aid is correct or Application is onboarded");
    	            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.INCORRECTDATA  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
    	            response.setStatus(400);
    	            return resultMap;

    	        }
                return resultMap;    
        }
        
        
        
		
        pQuery.appendQueryString(
                        "select uuid from admin.keyspace_master where application_name = ? allow filtering");
        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), appName));
        ResultSet rs = MusicCore.get(pQuery);
        List<Row> rows = rs.all();
        String uuid = null;
        if (rows.size() == 0) {
            resultMap.put("Exception",
                            "Application not found. Please make sure Application exists.");
            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.INCORRECTDATA  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
            response.setStatus(400);
            return resultMap;
        } else if (rows.size() == 1) {
            uuid = rows.get(0).getUUID("uuid").toString();
            pQuery = new PreparedQueryObject();
            pQuery.appendQueryString("SELECT keyspace_name FROM admin.keyspace_master WHERE uuid = ?");
    		pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(),
                    UUID.fromString(uuid)));
			Row row = MusicCore.get(pQuery).one();
			String ks = row.getString("keyspace_name");
			if (!ks.equals(MusicUtil.DEFAULTKEYSPACENAME)) {
				PreparedQueryObject queryObject = new PreparedQueryObject();
				queryObject.appendQueryString("DROP KEYSPACE " + ks + ";");
				MusicCore.nonKeyRelatedPut(queryObject, consistency);
			}
    		
            pQuery = new PreparedQueryObject();
            pQuery.appendQueryString("delete from admin.keyspace_master where uuid = ?");
            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(),
                            UUID.fromString(uuid)));
            MusicCore.eventualPut(pQuery);
            resultMap.put("Success", "Your application " + appName + " has been deleted.");
            return resultMap;
        } else {
            resultMap.put("Failure", "More than one Aid exists for this application, so please provide Aid.");
            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.MULTIPLERECORDS  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
            response.setStatus(400);
        }

        return resultMap;
    }


    @PUT
    @Path("/onboardAppWithMusic")
    @ApiOperation(value = "Update Onboard application", response = String.class)
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Map<String, Object> updateOnboardApp(JsonOnboard jsonObj,
                    @Context HttpServletResponse response) throws Exception {
        Map<String, Object> resultMap = new HashMap<>();
        response.addHeader("X-latestVersion", MusicUtil.getVersion());
        String aid = jsonObj.getAid();
        String appName = jsonObj.getAppname();
        String userId = jsonObj.getUserId();
        String isAAF = jsonObj.getIsAAF();
        String password = jsonObj.getPassword();
        String consistency = "eventual";
        PreparedQueryObject pQuery;

        if (aid == null) {
            resultMap.put("Exception", "Please make sure Aid is present");
            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.MISSINGDATA  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
            response.setStatus(400);
            return resultMap;
        }

        if (appName == null && userId == null && password == null && isAAF == null) {
            resultMap.put("Exception",
                            "No parameters found to update. Please update atleast one parameter.");
            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.MISSINGDATA  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
            response.setStatus(400);
            return resultMap;
        }
        
        if(appName!=null) {	
        	pQuery = new PreparedQueryObject();
	        pQuery.appendQueryString(
	                        "select uuid from admin.keyspace_master where application_name = ? allow filtering");
	        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), appName));
	        ResultSet rs = MusicCore.get(pQuery);
	        if (!rs.all().isEmpty()) {
	            resultMap.put("Exception", "Application " + appName
	                            + " has already been onboarded. Please contact admin.");
	            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.ALREADYEXIST  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
	            response.setStatus(400);
	            return resultMap;
	        }
        }
        
        	pQuery = new PreparedQueryObject();
	        StringBuilder preCql = new StringBuilder("UPDATE admin.keyspace_master SET ");
	        if (appName != null)
	            preCql.append(" application_name = ?,");
	        if (userId != null)
	            preCql.append(" username = ?,");
	        if (password != null)
	            preCql.append(" password = ?,");
	        if (isAAF != null)
	            preCql.append(" is_aaf = ?,");
	        preCql.deleteCharAt(preCql.length() - 1);
	        preCql.append(" WHERE uuid = ? IF EXISTS");
	        pQuery.appendQueryString(preCql.toString());
	        if (appName != null)
	            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), appName));
	        if (userId != null)
	            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), userId));
	        if (password != null)
	            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.text(), password));
	        if (isAAF != null)
	            pQuery.addValue(MusicUtil.convertToActualDataType(DataType.cboolean(), isAAF));
	
	        pQuery.addValue(MusicUtil.convertToActualDataType(DataType.uuid(), UUID.fromString(aid)));
	        ResultType result = MusicCore.nonKeyRelatedPut(pQuery, consistency);
	
	        if (result==ResultType.SUCCESS) {
	            resultMap.put("Success", "Your application has been updated successfully");
	        } else {
	            resultMap.put("Exception",
	                            "Oops. Spomething went wrong. Please make sure Aid is correct and application is onboarded");
	            logger.error(EELFLoggerDelegate.errorLogger,"", AppMessages.INCORRECTDATA  ,ErrorSeverity.CRITICAL, ErrorTypes.DATAERROR);
	            response.setStatus(400);
	        }
	        
        return resultMap;
    }
}