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Permission is hereby granted, free of charge, to any person obtaining a copy of this
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package com.amazonaws.services.neptune;

import com.github.rvesse.airline.SingleCommand;
import com.github.rvesse.airline.annotations.Command;
import com.github.rvesse.airline.annotations.Option;
import com.github.rvesse.airline.annotations.restrictions.*;
import org.apache.tinkerpop.gremlin.driver.*;
import org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteConnection;
import org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.process.traversal.step.util.WithOptions;

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

@Command(name = "connect", description = "Connect to Neptune")
public class GremlinClientDemo implements Runnable {

    @Option(name = {"--neptune-endpoint"}, description = "Neptune endpoint(s) – supply multiple instance endpoints if you want to load balance requests across a cluster")
    private List<String> neptuneEndpoints = new ArrayList<>();

    @Option(name = {"--port"}, description = "Neptune port (optional, default 8182)")
    @Port(acceptablePorts = {PortType.SYSTEM, PortType.USER})
    @Once
    private int neptunePort = 8182;

    @Option(name = {"--enable-iam-auth"}, description = "Use IAM database authentication to authenticate to Neptune (remember to set SERVICE_REGION environment variable, and, if using a load balancer, set the --host-header option as well)")
    @Once
    private boolean enableIamAuth = false;

    @Option(name = {"--enable-ssl"}, description = "Enables connectivity over SSL (optional, default false)")
    @Once
    private boolean enableSsl = false;

    @Option(name = {"--nlb-endpoint"}, description = "Network load balancer endpoint (optional: use only if connecting to an IAM DB enabled Neptune cluster through a network load balancer (NLB) – see https://github.com/aws-samples/aws-dbs-refarch-graph/tree/master/src/connecting-using-a-load-balancer#connecting-to-amazon-neptune-from-clients-outside-the-neptune-vpc-using-aws-network-load-balancer)")
    @Once
    @MutuallyExclusiveWith(tag = "load-balancer")
    private String networkLoadBalancerEndpoint;

    @Option(name = {"--alb-endpoint"}, description = "Application load balancer endpoint (optional: use only if connecting to an IAM DB enabled Neptune cluster through an application load balancer (ALB) – see https://github.com/aws-samples/aws-dbs-refarch-graph/tree/master/src/connecting-using-a-load-balancer#connecting-to-amazon-neptune-from-clients-outside-the-neptune-vpc-using-aws-application-load-balancer)")
    @Once
    @MutuallyExclusiveWith(tag = "load-balancer")
    private String applicationLoadBalancerEndpoint;

    @Option(name = {"--lb-port"}, description = "Load balancer port (optional, default 80)")
    @Port(acceptablePorts = {PortType.SYSTEM, PortType.USER})
    @Once
    private int loadBalancerPort = 80;

    @Override
    public void run() {

        // Turn on low-level Gremlin driver logging
        System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "trace");

        try {

            Cluster cluster = NeptuneClusterBuilder.build()
                    .enableSsl(enableSsl)
                    .enableIamAuth(enableIamAuth)
                    .addContactPoints(neptuneEndpoints)
                    .port(neptunePort)
                    .networkLoadBalancerEndpoint(networkLoadBalancerEndpoint)
                    .applicationLoadBalancerEndpoint(applicationLoadBalancerEndpoint)
                    .loadBalancerPort(loadBalancerPort)
                    .create();

            Client client = cluster.connect();
            DriverRemoteConnection connection = DriverRemoteConnection.using(client);
            GraphTraversalSource g = AnonymousTraversalSource.traversal().withRemote(connection);

            List<Map<Object, Object>> results =
                    g.V().limit(10)
                            .valueMap().with(WithOptions.tokens)
                            .toList();

            for (Map<Object, Object> result : results) {
                System.out.println(result);
            }

            client.close();
            cluster.closeAsync();

        } catch (Exception e) {
            System.err.println("An error occurred while connecting to Neptune:");
            e.printStackTrace();
            System.exit(-1);
        }

    }

    public static void main(String[] args) {
        SingleCommand<GremlinClientDemo> parser = SingleCommand.singleCommand(GremlinClientDemo.class);
        GremlinClientDemo cmd = parser.parse(args);
        cmd.run();
    }
}