import io.github.sergey_melnychuk.Argumentz;

public class Main { 
    public static void main(String args[]) {
        Argumentz arguments = Argumentz.builder()
                // String parameter with default value provided (thus optional).
                .withParam('u', "user", "username to connect to the server", () -> "guest")
                // Mapped parameter with default value (optional as well).
                .withParam('p', "port", "port for server to listen", Integer::parseInt, () -> 8080)
                // Mapped required parameter (no default value)
                .withParam('s', "seconds", "timeout in seconds", Integer::parseInt)
                // String parameter, required as well
                .withParam('h', "host", "host for client to connect to")
                // Boolean flag, when provided match will return true for "-v" and "--verbose"
                .withFlag('v', "verbose", "enable extra logging")
                // Error handler to address misconfiguration - it must terminate the program (exit or exception).
                // Argumentz won't allow proceeding with program execution after error has been detected.
                // Argumentz also won't allow blowing up the stack by recursive call `a.match(...)`.
                .withErrorHandler((RuntimeException e, Argumentz a) -> {
                    // print error and usage, then exit
                    System.err.println(e.getMessage() + "\n");
                    a.printUsage(System.out);
                    System.exit(1);
                    // or just re-throw the exception
                    // throw e;
                })
                .build();
        
        Argumentz.Match match = arguments.match(args);
        
        String user = match.get("user");
        int port = match.getInt("port");
        String host = match.get("host");
        int seconds = match.getInt("seconds");
        boolean verbose = match.getFlag("verbose");
        
        System.out.printf("user=%s\nport=%d\nhost=%s\nseconds=%d\nverbose=%b%n", 
            user, port, host, seconds, verbose);
    }
}