package rlbot;

import com.google.protobuf.InvalidProtocolBufferException;

import py4j.GatewayServer;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Optional;

import java.util.stream.Stream;

/**

* See JavaAgent.py for usage instructions

*/

public class JavaExample {

public static void main(String[] args) throws InvalidProtocolBufferException {

// Scenario: you finished your bot and submitted it to a tournament. Your opponent hard-coded the same

// as you, and the match can't start because of the conflict. Because of this line, you can ask the

// organizer make a file called "port.txt" in the same directory as your .jar, and put some other number in it.

// This matches code in JavaAgent.py

int port = readPortFromFile();

GatewayServer gatewayServer = new GatewayServer(new PythonEntryPoint(), port);

gatewayServer.start();

System.out.println(String.format("Gateway server started on port %s. Listening for Rocket League data!", port));

}

private static Integer readPortFromFile() {

Path path = Paths.get("port.cfg");

try (Stream<String> lines = Files.lines(path)) {

Optional<String> firstLine = lines.findFirst();

return firstLine.map(Integer::parseInt).orElseThrow(() -> new RuntimeException("Port config file was empty!"));

} catch (final IOException e) {

throw new RuntimeException("Failed to read port file! Tried to find it at " + path.toAbsolutePath().toString());

}

}

}