/*-
 * ============LICENSE_START=======================================================
 * org.onap.dmaap
 * ================================================================================
 * 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.dmaap.dbcapi.service;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.ws.rs.core.Response.Status;

import org.apache.log4j.Logger;
import org.onap.dmaap.dbcapi.aaf.client.DrProvConnection;
import org.onap.dmaap.dbcapi.aaf.database.DatabaseClass;
import org.onap.dmaap.dbcapi.logging.BaseLoggingClass;
import org.onap.dmaap.dbcapi.model.ApiError;
import org.onap.dmaap.dbcapi.model.DR_Pub;
import org.onap.dmaap.dbcapi.model.DR_Sub;
import org.onap.dmaap.dbcapi.model.Feed;
import org.onap.dmaap.dbcapi.model.DmaapObject.DmaapObject_Status;
import org.onap.dmaap.dbcapi.util.DmaapConfig;

public class FeedService  extends BaseLoggingClass {
	
	private Map<String, Feed> feeds = DatabaseClass.getFeeds();
	private DR_PubService pubService = new DR_PubService();
	private DR_SubService subService = new DR_SubService();
	private DcaeLocationService dcaeLocations = new DcaeLocationService();
	private String deleteHandling;
	
	public FeedService() {
		logger.info( "new FeedService");
		DmaapConfig p = (DmaapConfig)DmaapConfig.getConfig();
		deleteHandling = p.getProperty("Feed.deleteHandling", "DeleteOnDR");

	}
	
	public Map<String, Feed> getFeeds() {			
		return feeds;
	}
	
	private void getSubObjects( Feed f ) {
		ArrayList<DR_Pub> pubs = pubService.getDr_PubsByFeedId( f.getFeedId() );
		f.setPubs(pubs);
		ArrayList<DR_Sub> subs = subService.getDr_SubsByFeedId( f.getFeedId() );
		f.setSubs(subs);	
	}
		
	public List<Feed> getAllFeeds() {
		ArrayList<Feed> fatFeeds = new ArrayList<Feed>();
		for( Feed f:  feeds.values() ) {
			getSubObjects(f);
			fatFeeds.add(f);
		}
		return fatFeeds;
	}
	
	
	private Feed _getFeed( String key, ApiError err, boolean flag ) {
		Feed f = feeds.get( key );
		if ( f != null && ( flag || f.getStatus() != DmaapObject_Status.DELETED ) ) {
			getSubObjects( f );
		} else {
			err.setCode(Status.NOT_FOUND.getStatusCode());
			err.setMessage("feed not found");
			err.setFields("feedId=" + key );
			return null;
		}
		err.setCode(200);
		return f;
	}
	public Feed getFeed( String key, ApiError err ) {
		return _getFeed( key, err, false );
	}
	public Feed getFeedPure( String key, ApiError err ) {
		return _getFeed( key, err, true );
	}
	
	public Feed getFeedByName( String name, String ver, ApiError err ) {
		for( Feed f:  feeds.values() ) {
			if ( f.getFeedName().equals( name ) && f.getFeedVersion().equals(ver) ) {
				getSubObjects(f);
				return f;
			}
	
		}
		err.setCode(Status.NOT_FOUND.getStatusCode());
		err.setMessage("feed not found");
		err.setFields("feedName=" + name + " and ver=" + ver );
		return null;
	
	}

	private boolean savePubs( Feed f ) {
		return savePubs( f, f );
	}
	// need to save the Pub objects independently and copy pubId from original request
	private boolean savePubs( Feed fnew, Feed req ) {
		// save any pubs
		DR_PubService pubSvc = new DR_PubService();
		ArrayList<DR_Pub> reqPubs = req.getPubs();
		ArrayList<DR_Pub> newPubs = fnew.getPubs();
		

		
		int nSize = newPubs.size();
		int rSize = reqPubs.size();
		logger.info( "reqPubs size=" + rSize + " newPubs size=" + nSize );
		if ( nSize != rSize ) {
			errorLogger.error( "Resulting set of publishers do not match requested set of publishers " + nSize + " vs " + rSize );
			fnew.setStatus( DmaapObject_Status.INVALID);
			return false;
		}
		// NOTE: when i > 1 newPubs are in reverse order from reqPubs
		for( int i = 0; i < reqPubs.size(); i++ ) {
			DR_Pub reqPub = reqPubs.get(i);	
			ApiError err = new ApiError();
			if ( pubSvc.getDr_Pub( reqPub.getPubId(), err ) == null ) {
				DR_Pub newPub = newPubs.get(nSize - i - 1);
				reqPub.setPubId(newPub.getPubId());
				reqPub.setFeedId(newPub.getFeedId());
				reqPub.setStatus(DmaapObject_Status.VALID);
				if ( reqPub.getDcaeLocationName() == null ) {
					reqPub.setDcaeLocationName("notSpecified");
				}
				pubSvc.addDr_Pub( reqPub );
			}
			
		}
		
		fnew.setPubs(reqPubs);
		fnew.setStatus(DmaapObject_Status.VALID);
		return true;

	}
	
	private boolean saveSubs( Feed f ) {
		return saveSubs( f, f );
	}
	// need to save the Sub objects independently
	private boolean saveSubs( Feed fnew, Feed req ) {	
		ArrayList<DR_Sub> subs = req.getSubs();
		if ( subs.size() == 0 ) {
			logger.info( "No subs specified");
		} else {
			DR_SubService subSvc = new DR_SubService( fnew.getSubscribeURL() );
			ApiError err = new ApiError();
			for( int i = 0; i <  subs.size(); i++ ) {
				DR_Sub sub = subs.get(i);
				if ( subSvc.getDr_Sub( sub.getSubId(), err) == null ) {
					subs.set( i,  subSvc.addDr_Sub(sub, err));
					if ( ! err.is2xx())  {
						logger.error( "i=" + i + " url=" + sub.getDeliveryURL() + " err=" + err.getCode() );
						return false;
					}
				}
				
			}
			fnew.setSubs(subs);
		}


		fnew.setStatus(DmaapObject_Status.VALID);
		return true;

	}

	public  Feed addFeed( Feed req, ApiError err ) {

		// at least 1 pub is required by DR, so create a default pub if none is specified
		if ( req.getPubs().size() == 0 ) {
			logger.info( "No pubs specified - creating tmp pub");
			ArrayList<DR_Pub> pubs = new ArrayList<DR_Pub>();
			pubs.add( new DR_Pub( dcaeLocations.getCentralLocation())
								.setRandomUserName()
								.setRandomPassword());
			req.setPubs(pubs);
		} 
		

		DrProvConnection prov = new DrProvConnection();
		prov.makeFeedConnection();	
		String resp = prov.doPostFeed( req, err );
		logger.info( "resp=" + resp );
		if ( resp == null ) {
			switch( err.getCode() ) {
			case 400: 
				err.setFields( "feedName=" + req.getFeedName() + " + feedVersion=" + req.getFeedVersion() );
				break;
			case 403:
				err.setCode(500);
				err.setMessage("API deployment/configuration error - contact support");
				err.setFields( "PROV_AUTH_ADDRESSES");
				logger.error( "Prov response: 403. " + err.getMessage() + " regarding " + err.getFields() );
				break;
			default:
				err.setCode(500);
				err.setMessage( "Unexpected response from DR backend" );
				err.setFields("response");
			}
			return null;

		}


		Feed fnew = new Feed( resp );
		logger.info( "fnew status is:" + fnew.getStatus() );
		if ( ! fnew.isStatusValid()) {		
			err.setCode(500);
			err.setMessage( "Unexpected response from DR backend" );
			err.setFields("response");		
			return null;
		}
		
		//saveChildren( fnew, req );
		if ( ! savePubs( fnew, req ) || ! saveSubs( fnew, req ) ) {
			err.setCode(Status.BAD_REQUEST.getStatusCode());
			err.setMessage("Unable to save Pub or Sub objects");
			return null;
		}
		fnew.setFormatUuid(req.getFormatUuid());
		fnew.setLastMod();
		feeds.put( fnew.getFeedId(), fnew );
		return fnew;
	}
		
	public Feed updateFeed( Feed req, ApiError err ) {
	
		// at least 1 pub is required by DR, so create a default pub if none is specified
		if ( req.getPubs().size() == 0 ) {
			logger.info( "No pubs specified - creating tmp pub");
			ArrayList<DR_Pub> pubs = new ArrayList<DR_Pub>();
			pubs.add( new DR_Pub( dcaeLocations.getCentralLocation())
								.setRandomUserName()
								.setRandomPassword());
			req.setPubs(pubs);
		} 
		
		DrProvConnection prov = new DrProvConnection();
		prov.makeFeedConnection( req.getFeedId() );
		String resp = prov.doPutFeed( req, err );
		logger.info( "resp=" + resp );
		if ( resp == null ) {
			switch( err.getCode() ) {
			case 400: 
				err.setFields( "feedName=" + req.getFeedName() + " + feedVersion=" + req.getFeedVersion() );
				break;
			case 403:
				err.setCode(500);
				err.setMessage("API deployment/configuration error - contact support");
				err.setFields( "PROV_AUTH_ADDRESSES");
				break;
			default:
				err.setCode(500);
				err.setMessage( "Unexpected response from DR backend" );
				err.setFields("response");
			}
			return null;
		}


		Feed fnew = new Feed( resp );
		logger.info( "fnew status is:" + fnew.getStatus() );
		if ( ! fnew.isStatusValid()) {		
			err.setCode(500);
			err.setMessage( "Unexpected response from DR backend" );
			err.setFields("response");		
			return null;
		}

		if ( ! savePubs( fnew, req ) || ! saveSubs( fnew, req ) ) {
			err.setCode(Status.BAD_REQUEST.getStatusCode());
			err.setMessage("Unable to save Pub or Sub objects");
			return null;
		}
		fnew.setFormatUuid(req.getFormatUuid());
		fnew.setLastMod();
		feeds.put( fnew.getFeedId(), fnew );
		return fnew;
	}
	
	
	//
	// DR does not actually delete a feed, so we provide two behaviors:
	// 1) clean up the feed by removing all subs and pubs, mark it here as DELETED.
	//    then client can add it back if desired.
	// 2) Call the DR Delete function.  Feed with the same name and version can never be added again
	//
	public Feed removeFeed( Feed req, ApiError err ) {
		
		// strip pubs and subs from feed first no matter what
		ArrayList<DR_Pub> pubs = pubService.getDr_PubsByFeedId( req.getFeedId() );
		for( DR_Pub pub: pubs ) {
			pubService.removeDr_Pub(pub.getPubId(), err);
			if ( ! err.is2xx()) {
				return req;
			}
		}
		ArrayList<DR_Sub> subs = subService.getDr_SubsByFeedId( req.getFeedId() );
		for ( DR_Sub sub: subs ) {
			subService.removeDr_Sub(sub.getSubId(), err);
			if ( ! err.is2xx()) {
				return req;
			}
		}
	
		if ( deleteHandling.equalsIgnoreCase("DeleteOnDR")) {
			DrProvConnection prov = new DrProvConnection();
			prov.makeFeedConnection( req.getFeedId() );
			String resp = prov.doDeleteFeed( req, err );
			logger.info( "resp=" + resp );
			if ( resp == null ) {
				switch( err.getCode() ) {
				case 400: 
					err.setFields( "feedName=" + req.getFeedName() + " + feedVersion=" + req.getFeedVersion() );
					break;
				case 403:
					err.setCode(500);
					err.setMessage("API deployment/configuration error - contact support");
					err.setFields( "PROV_AUTH_ADDRESSES");
					break;
				default:
					err.setCode(500);
					err.setMessage( "Unexpected response from DR backend" );
					err.setFields("response");
				}
				return req;  // return back the requested feed - implies it wasn't removed
			}
			return feeds.remove(req.getFeedId());
		} else {
			req.setStatus(DmaapObject_Status.DELETED);
			req.setPubs(null);
			req.setSubs(null);
			req.setLastMod();
			feeds.put( req.getFeedId(), req );
			return null;
		}

		
	}	

}