/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package jdk.testlibrary;

import static jdk.testlibrary.Asserts.assertTrue;

import java.net.InetAddress;
import java.net.ServerSocket;
import java.util.ArrayList;
import java.util.List;

public final class Utils {

    public static final String NEW_LINE = System.getProperty("line.separator");
    
    public static final String VM_OPTIONS = System.getProperty("test.vm.opts", "");
    
    public static List<String> getVmOptions() {
        return getVmOptions(false);
    }

    public static List<String> getForwardVmOptions() {
        return getVmOptions(true);
    }

    private static List<String> getVmOptions(boolean forward) {
        List<String> optionsList = new ArrayList<>();
        String options = VM_OPTIONS.trim();
        if (!options.isEmpty()) {
            options = options.replaceAll("\\s+", " ");
            for (String option : options.split(" ")) {
                if (forward) {
                    optionsList.add("-J" + option);
                } else {
                    optionsList.add(option);
                }
            }
        }

        return optionsList;
    }

    /**
     * The function will spin until a free port is found
     */
    public static int getFreePort() throws Exception {
        int port = -1;

        while (port <= 0) {
            System.out.println("Retrieving free port...");
            Thread.sleep(100);

            ServerSocket serverSocket = new ServerSocket(0);
            port = serverSocket.getLocalPort();
            serverSocket.close();
        }

        System.out.println("Free port: " + port);
        return port;
    }
    
    public static String getHostname() throws Exception {
        InetAddress inetAddress = InetAddress.getLocalHost();
        String hostName = inetAddress.getHostName();
        
        assertTrue((hostName != null && !hostName.isEmpty()), 
                "Cannot get hostname");

        return hostName;
    }

}