/*-
 * ============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.resources;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;

import java.util.List;

import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
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.Feed;
import org.onap.dmaap.dbcapi.model.DmaapObject.DmaapObject_Status;
import org.onap.dmaap.dbcapi.service.FeedService;


@Path("/feeds")
@Api( value= "Feeds", description = "Endpoint for a Data Router Feed" )
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Authorization
public class FeedResource extends BaseLoggingClass {

	private ResponseBuilder responseBuilder = new ResponseBuilder();
	private RequiredChecker checker = new RequiredChecker();

	@GET
	@ApiOperation( value = "return Feed details", 
	notes = "Returns array of  `Feed` objects.", 
	response = Feed.class)
	@ApiResponses( value = {
	    @ApiResponse( code = 200, message = "Success", response = Feed.class),
	    @ApiResponse( code = 400, message = "Error", response = ApiError.class )
	})
	public Response getFeeds(
			@QueryParam("feedName") String feedName,
			@QueryParam("version") String version,
			@QueryParam("match") String match) {

		FeedService feedService = new FeedService();
		List<Feed> nfeeds =  feedService.getAllFeeds( feedName, version, match );
		GenericEntity<List<Feed>> list = new GenericEntity<List<Feed>>(nfeeds) {
        };
        return responseBuilder.success(list);
	}
	

	
	@POST
	@ApiOperation( value = "return Feed details", 
	notes = "Create a of  `Feed` object.", 
	response = Feed.class)
	@ApiResponses( value = {
	    @ApiResponse( code = 200, message = "Success", response = Feed.class),
	    @ApiResponse( code = 400, message = "Error", response = ApiError.class )
	})
	public Response addFeed( 
			Feed feed,
			@QueryParam("useExisting") String useExisting) {

		ApiError apiError = new ApiError();

		try {
			checker.required( "feedName", feed.getFeedName());
			checker.required( "feedVersion", feed.getFeedVersion());
			checker.required( "owner", feed.getOwner());
			checker.required( "asprClassification", feed.getAsprClassification());
		} catch ( RequiredFieldException rfe ) {
			logger.debug( rfe.getApiError().toString() );
			return responseBuilder.error(rfe.getApiError());
		}
		
		
		FeedService feedService = new FeedService();
		Feed nfeed =  feedService.getFeedByName( feed.getFeedName(), feed.getFeedVersion(), apiError);
		if ( nfeed == null ) {
			nfeed =  feedService.addFeed(feed, apiError);
			if ( nfeed != null ) {
				return responseBuilder.success(nfeed);
			} else {
				logger.error( "Unable to create: " + feed.getFeedName() + ":" + feed.getFeedVersion());

				return responseBuilder.error(apiError);
			}
		} else if ( nfeed.getStatus() == DmaapObject_Status.DELETED ) {
			feed.setFeedId( nfeed.getFeedId());
			nfeed =  feedService.updateFeed(feed, apiError);
			if ( nfeed != null ) {
				return responseBuilder.success(nfeed);
			} else {
				logger.info( "Unable to update: " + feed.getFeedName() + ":" + feed.getFeedVersion());

				return responseBuilder.error(apiError);
			}
		} else if ( (useExisting != null) && ("true".compareToIgnoreCase( useExisting ) == 0)) {
			return responseBuilder.success(nfeed);
		}

		apiError.setCode(Status.CONFLICT.getStatusCode());
		return responseBuilder.error(apiError);
	}
	
	@PUT
	@ApiOperation( value = "return Feed details", 
	notes = "Update a  `Feed` object, specified by id.", 
	response = Feed.class)
	@ApiResponses( value = {
	    @ApiResponse( code = 200, message = "Success", response = Feed.class),
	    @ApiResponse( code = 400, message = "Error", response = ApiError.class )
	})
	@Path("/{id}")
	public Response updateFeed( 
			@PathParam("id") String id,
			Feed feed) {

		FeedService feedService = new FeedService();
		ApiError apiError = new ApiError();

		try {
			checker.required( "feedId", id);
		} catch ( RequiredFieldException rfe ) {
			logger.debug( rfe.getApiError().toString() );
			return responseBuilder.error(rfe.getApiError());
		}

		Feed nfeed = feedService.getFeed(id, apiError);
		if ( nfeed == null || nfeed.getStatus() == DmaapObject_Status.DELETED ) {
			return responseBuilder.notFound();
		}
	
		//  we assume there is no updates allowed for pubs and subs objects via this api...		
		// need to update any fields supported by PUT but preserve original field values. 
		nfeed.setSuspended(feed.isSuspended());
		nfeed.setFeedDescription(feed.getFeedDescription());
		nfeed.setFormatUuid(feed.getFormatUuid());
		
		nfeed =  feedService.updateFeed(nfeed, apiError);
		if ( nfeed != null ) {
			return responseBuilder.success(nfeed);
		} else {
			logger.info( "Unable to update: " + feed.getFeedName() + ":" + feed.getFeedVersion());

			return responseBuilder.error(apiError);
		}
	}
	
	@DELETE
	@ApiOperation( value = "return Feed details", 
	notes = "Delete a  `Feed` object, specified by id.", 
	response = Feed.class)
	@ApiResponses( value = {
	    @ApiResponse( code = 204, message = "Success", response = Feed.class),
	    @ApiResponse( code = 400, message = "Error", response = ApiError.class )
	})
	@Path("/{id}")
	public Response deleteFeed(@PathParam("id") String id){
		ApiError apiError = new ApiError();

		logger.debug( "Entry: DELETE  " + id);
		FeedService feedService = new FeedService();
		Feed nfeed =  feedService.getFeed(id, apiError);
		if ( nfeed == null ) {
			apiError.setCode(Status.NOT_FOUND.getStatusCode());
			return responseBuilder.error(apiError);
		}
		nfeed = feedService.removeFeed(nfeed, apiError);
		if ( nfeed == null || nfeed.getStatus() == DmaapObject_Status.DELETED ) {
			return responseBuilder.success(Status.NO_CONTENT.getStatusCode(), null);
		}
		logger.info( "Unable to delete: " + id + ":" + nfeed.getFeedVersion());

		return responseBuilder.error(apiError);
	}

	@GET
	@ApiOperation( value = "return Feed details", 
	notes = "Retrieve a  `Feed` object, specified by id.", 
	response = Feed.class)
	@ApiResponses( value = {
	    @ApiResponse( code = 200, message = "Success", response = DR_Pub.class),
	    @ApiResponse( code = 400, message = "Error", response = ApiError.class )
	})
	@Path("/{id}")
	public Response getFeed(@PathParam("id") String id) {
		ApiError apiError = new ApiError();

		FeedService feedService = new FeedService();
		Feed nfeed =  feedService.getFeed(id, apiError);
		if ( nfeed == null ) {
			apiError.setCode(Status.NOT_FOUND.getStatusCode());
			return responseBuilder.error(apiError);
		}
		return responseBuilder.success(nfeed);
	}
	
	@PUT
	@ApiOperation( value = "sync feeds to existing DR",
	notes = "When Bus Controller is deployed after DR, then it is possible"
			+ "that DR has previous provisioning data that needs to be imported"
			+ "into Bus Controller.",
	response = Feed.class )
	@ApiResponses( value =  {
			@ApiResponse( code = 200, message = "Success", response = Feed.class),
			@ApiResponse( code = 400, message = "Error", response = ApiError.class )
	})
	@Path( "/sync")
	public Response syncFeeds (@QueryParam("hard") String hardParam) {
		ApiError error = new ApiError();
		
		FeedService feedService = new FeedService();
		boolean hard = false;
		if (  hardParam != null && hardParam.equalsIgnoreCase("true")) {
			hard = true;
		}
		feedService.sync( hard, error );
		if ( error.is2xx()) {
			List<Feed> nfeeds =  feedService.getAllFeeds();
			GenericEntity<List<Feed>> list = new GenericEntity<List<Feed>>(nfeeds) {
			};
			return responseBuilder.success(list);
		}
		return responseBuilder.error(error);
	}
	
}