/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.usergrid.rest;


import java.util.Set;
import java.util.UUID;

import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
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.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.UriInfo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import org.apache.usergrid.persistence.EntityManager;
import org.apache.usergrid.persistence.EntityManagerFactory;
import org.apache.usergrid.persistence.EntityManagerFactory.ProgressObserver;
import org.apache.usergrid.persistence.EntityRef;
import org.apache.usergrid.persistence.index.utils.UUIDUtils;
import org.apache.usergrid.rest.security.annotations.RequireSystemAccess;

import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.sun.jersey.api.json.JSONWithPadding;


@Path( "/system" )
@Component
@Scope( "singleton" )
@Produces( {
        MediaType.APPLICATION_JSON, "application/javascript", "application/x-javascript", "text/ecmascript",
        "application/ecmascript", "text/jscript"
} )
public class SystemResource extends AbstractContextResource {

    private static final Logger logger = LoggerFactory.getLogger( SystemResource.class );


    public SystemResource() {
        logger.info( "SystemResource initialized" );
    }


    @RequireSystemAccess
    @GET
    @Path( "database/setup" )
    public JSONWithPadding getSetup( @Context UriInfo ui,
                                     @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback )
            throws Exception {

        ApiResponse response = createApiResponse();
        response.setAction( "cassandra setup" );

        logger.info( "Setting up Cassandra" );


        emf.setup();


        management.setup();

        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    @RequireSystemAccess
    @GET
    @Path( "superuser/setup" )
    public JSONWithPadding getSetupSuperuser( @Context UriInfo ui,
                                              @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback )
            throws Exception {

        ApiResponse response = createApiResponse();
        response.setAction( "superuser setup" );

        logger.info( "Setting up Superuser" );

        try {
            management.provisionSuperuser();
        }
        catch ( Exception e ) {
            logger.error( "Unable to complete superuser setup", e );
        }

        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    @RequireSystemAccess
    @PUT
    @Path( "migrate/run" )
    public JSONWithPadding migrateData( @Context UriInfo ui,
                                        @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback )
            throws Exception {

        ApiResponse response = createApiResponse();
        response.setAction( "Migrate Data" );


        final Thread migrate = new Thread() {

            @Override
            public void run() {
                logger.info( "Rebuilding all indexes" );

                try {
                    emf.migrateData();
                }
                catch ( Exception e ) {
                    logger.error( "Unable to rebuild indexes", e );
                }
            }
        };

        migrate.setName( "Index migrate data formats" );
        migrate.setDaemon( true );
        migrate.start();


        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    @RequireSystemAccess
    @GET
    @Path( "migrate/status" )
    public JSONWithPadding migrateStatus( @Context UriInfo ui,
                                          @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback )
            throws Exception {

        ApiResponse response = createApiResponse();
        response.setAction( "Migrate Schema indexes" );

        ObjectNode node = JsonNodeFactory.instance.objectNode();
        node.put( "currentVersion", emf.getMigrateDataVersion() );
        node.put( "lastMessage", emf.getMigrateDataStatus() );
        response.setProperty( "status", node );

        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    @RequireSystemAccess
    @PUT
    @Path( "index/rebuild" )
    public JSONWithPadding rebuildIndexes( @Context UriInfo ui,
                                           @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback )
            throws Exception {

        ApiResponse response = createApiResponse();
        response.setAction( "rebuild indexes" );


        final ProgressObserver po = new ProgressObserver() {


            @Override
            public void onProgress( final EntityRef entity ) {
                logger.info( "Indexing entity {}:{} ", entity.getType(), entity.getUuid() );
            }


            @Override
            public long getWriteDelayTime() {
                return 0;
            }
        };


        final Thread rebuild = new Thread() {

            @Override
            public void run() {
                logger.info( "Rebuilding all indexes" );

                try {
                    emf.rebuildAllIndexes( po );
                }
                catch ( Exception e ) {
                    logger.error( "Unable to rebuild indexes", e );
                }
            }
        };

        rebuild.setName( "Index rebuild all usergrid" );
        rebuild.setDaemon( true );
        rebuild.start();


        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    @RequireSystemAccess
    @PUT
    @Path( "index/rebuild/" + RootResource.APPLICATION_ID_PATH )
    public JSONWithPadding rebuildIndexes( @Context UriInfo ui, @PathParam( "applicationId" ) String applicationIdStr,
                                           @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback,
                                           @QueryParam( "delay" ) @DefaultValue( "10" ) final long delay )

            throws Exception {

        final UUID appId = UUIDUtils.tryExtractUUID( applicationIdStr );
        ApiResponse response = createApiResponse();
        response.setAction( "rebuild indexes" );


        final EntityManager em = emf.getEntityManager( appId );

        final Set<String> collectionNames = em.getApplicationCollections();

        final Thread rebuild = new Thread() {

            @Override
            public void run() {
                for ( String collectionName : collectionNames )


                {
                    rebuildCollection( appId, collectionName, delay );
                }
            }
        };

        rebuild.setName( String.format( "Index rebuild for app %s", appId ) );
        rebuild.setDaemon( true );
        rebuild.start();

        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    @RequireSystemAccess
    @PUT
    @Path( "index/rebuild/" + RootResource.APPLICATION_ID_PATH + "/{collectionName}" )
    public JSONWithPadding rebuildIndexes( @Context UriInfo ui,
                                           @PathParam( "applicationId" ) final String applicationIdStr,
                                           @PathParam( "collectionName" ) final String collectionName,
                                           @QueryParam( "callback" ) @DefaultValue( "callback" ) String callback,
                                           @QueryParam( "delay" ) @DefaultValue( "10" ) final long delay )
            throws Exception {

        final UUID appId = UUIDUtils.tryExtractUUID( applicationIdStr );
        ApiResponse response = createApiResponse();
        response.setAction( "rebuild indexes" );

        final Thread rebuild = new Thread() {

            public void run() {

                rebuildCollection( appId, collectionName, delay );
            }
        };

        rebuild.setName( String.format( "Index rebuild for app %s and collection %s", appId, collectionName ) );
        rebuild.setDaemon( true );
        rebuild.start();

        response.setSuccess();

        return new JSONWithPadding( response, callback );
    }


    private void rebuildCollection( final UUID applicationId, final String collectionName, final long delay ) {
        EntityManagerFactory.ProgressObserver po = new EntityManagerFactory.ProgressObserver() {

            @Override
            public void onProgress( final EntityRef entity ) {
                logger.info( "Indexing entity {}:{}", entity.getType(), entity.getUuid() );
            }


            @Override
            public long getWriteDelayTime() {
                return delay;
            }
        };


        logger.info( "Reindexing for app id: {} and collection {}", applicationId, collectionName );

        emf.rebuildCollectionIndex( applicationId, collectionName, po );
        emf.refreshIndex();
    }
}