/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * http://plantuml.com/patreon (only 1$ per month!)
 * http://plantuml.com/paypal
 *
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 *
 *
 */
package net.sourceforge.plantuml.ftp;

// server

// FtpServer.java
import static java.nio.charset.StandardCharsets.UTF_8;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.log.Logger;

public class FtpServer {

	private final Map<String, FtpConnexion> datas = new TreeMap<String, FtpConnexion>();
	private final ExecutorService exeImage = Executors.newFixedThreadPool(2);

	private final int listenPort;

	private int portFree = 10042;
	private String ip;
	private final FileFormat defaultfileFormat;

	public FtpServer(int listenPort, FileFormat defaultfileFormat) {
		this.listenPort = listenPort;
		this.defaultfileFormat = defaultfileFormat == null ? FileFormat.PNG : defaultfileFormat;
	}

	public synchronized int getFreePort() {
		portFree++;
		// Log.println("port=" + portFree);
		return portFree;
	}

	public void go() throws IOException {
		final ServerSocket s = new ServerSocket(listenPort);
		final ExecutorService exe = Executors.newCachedThreadPool();
		while (true) {
			final Socket incoming = s.accept();
			ip = incoming.getLocalAddress().getHostAddress();
			System.out.println("New Client Connected from " + incoming.getInetAddress().getHostName() + "... ");
			exe.submit(new FtpLoop(incoming, this));
		}
	}

	public String getIpServer() {
		return ip;
	}

	public synchronized FtpConnexion getFtpConnexion(String user) {
		FtpConnexion data = datas.get(Objects.requireNonNull(user));
		if (data == null) {
			data = new FtpConnexion(user, defaultfileFormat);
			datas.put(user, data);
		}
		return data;
	}

	public static void main(String[] args) throws IOException {
		System.out.println("****************************** ************************************************** ");
		System.out.println("****************************** FTP SERVER***********************************");

		System.out.println("****************************** ************************************************** ");
		System.out.println("Server Started...");
		System.out.println("Waiting for connections...");
		System.out.println(" ");
		new FtpServer(4242, FileFormat.PNG).go();
	}

	public void processImage(final FtpConnexion connexion, final String name) {
		exeImage.submit(new Runnable() {
			public void run() {
				try {
					connexion.processImage(name);
				} catch (IOException e) {
					Logger.error(e);
				}
			}
		});
	}

	public final String getCharset() {
		return UTF_8.name();
	}

}