import java.util.ArrayDeque;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.atomic.AtomicInteger;

/// One participant's side of the world: scripted input, a lookup table, a
/// counter, and tagged stdout. Same responsibilities as the Rust `Host`s in
/// `compare/`, minus `Sleep`, which belongs to the scheduler.
final class Host {
    final String tag;
    private final Queue<String> script;
    private final AtomicInteger count = new AtomicInteger();

    Host(String tag, List<String> script) {
        this.tag = tag;
        this.script = new ArrayDeque<>(script);
    }

    String readLine() {
        var line = script.poll();
        if (line == null) {
            line = "quit";
        }
        write("> " + line);
        return line;
    }

    static String greetingFor(String name) {
        return switch (name) {
            case "Monde", "Amélie" -> "Bonjour";
            case "Welt", "Hans" -> "Hallo";
            case "Mundo", "Inés" -> "Hola";
            default -> "Hello";
        };
    }

    int count() {
        return count.incrementAndGet();
    }

    void write(String text) {
        System.out.printf("[%s @ %s] %s%n", tag, Thread.currentThread().getName(), text);
    }
}