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/**
 * 	Copyright (C) August 2019 Raúl Eduardo González Argote - [email protected]
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as published by
 * the Free Software Foundation, version 3, 29 June 2007
 *
 * This program is 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.
 *
 *                   GNU LESSER GENERAL PUBLIC LICENSE
 *                        Version 3, 29 June 2007
 *
 *  Copyright (C) 2007 Free Software Foundation, Inc. 
 *  Everyone is permitted to copy and distribute verbatim copies
 *  of this license document, but changing it is not allowed.
 *
 *
 *   This version of the GNU Lesser General Public License incorporates
 * the terms and conditions of version 3 of the GNU General Public
 * License, supplemented by the additional permissions listed below.
 *
 *   0. Additional Definitions.
 *
 *   As used herein, "this License" refers to version 3 of the GNU Lesser
 * General Public License, and the "GNU GPL" refers to version 3 of the GNU
 * General Public License.
 *
 *   "The Library" refers to a covered work governed by this License,
 * other than an Application or a Combined Work as defined below.
 *
 *   An "Application" is any work that makes use of an interface provided
 * by the Library, but which is not otherwise based on the Library.
 * Defining a subclass of a class defined by the Library is deemed a mode
 * of using an interface provided by the Library.
 *
 *   A "Combined Work" is a work produced by combining or linking an
 * Application with the Library.  The particular version of the Library
 * with which the Combined Work was made is also called the "Linked
 * Version".
 *
 *   The "Minimal Corresponding Source" for a Combined Work means the
 * Corresponding Source for the Combined Work, excluding any source code
 * for portions of the Combined Work that, considered in isolation, are
 * based on the Application, and not on the Linked Version.
 *
 *   The "Corresponding Application Code" for a Combined Work means the
 * object code and/or source code for the Application, including any data
 * and utility programs needed for reproducing the Combined Work from the
 * Application, but excluding the System Libraries of the Combined Work.
 *
 *   1. Exception to Section 3 of the GNU GPL.
 *
 *   You may convey a covered work under sections 3 and 4 of this License
 * without being bound by section 3 of the GNU GPL.
 *
 *   2. Conveying Modified Versions.
 *
 *   If you modify a copy of the Library, and, in your modifications, a
 * facility refers to a function or data to be supplied by an Application
 * that uses the facility (other than as an argument passed when the
 * facility is invoked), then you may convey a copy of the modified
 * version:
 *
 *    a) under this License, provided that you make a good faith effort to
 *    ensure that, in the event an Application does not supply the
 *    function or data, the facility still operates, and performs
 *    whatever part of its purpose remains meaningful, or
 *
 *    b) under the GNU GPL, with none of the additional permissions of
 *    this License applicable to that copy.
 *
 *   3. Object Code Incorporating Material from Library Header Files.
 *
 *   The object code form of an Application may incorporate material from
 * a header file that is part of the Library.  You may convey such object
 * code under terms of your choice, provided that, if the incorporated
 * material is not limited to numerical parameters, data structure
 * layouts and accessors, or small macros, inline functions and templates
 * (ten or fewer lines in length), you do both of the following:
 *
 *    a) Give prominent notice with each copy of the object code that the
 *    Library is used in it and that the Library and its use are
 *    covered by this License.
 *
 *    b) Accompany the object code with a copy of the GNU GPL and this license
 *    document.
 *
 *   4. Combined Works.
 *
 *   You may convey a Combined Work under terms of your choice that,
 * taken together, effectively do not restrict modification of the
 * portions of the Library contained in the Combined Work and reverse
 * engineering for debugging such modifications, if you also do each of
 * the following:
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 *    a) Give prominent notice with each copy of the Combined Work that
 *    the Library is used in it and that the Library and its use are
 *    covered by this License.
 *
 *    b) Accompany the Combined Work with a copy of the GNU GPL and this license
 *    document.
 *
 *    c) For a Combined Work that displays copyright notices during
 *    execution, include the copyright notice for the Library among
 *    these notices, as well as a reference directing the user to the
 *    copies of the GNU GPL and this license document.
 *
 *    d) Do one of the following:
 *
 *        0) Convey the Minimal Corresponding Source under the terms of this
 *        License, and the Corresponding Application Code in a form
 *        suitable for, and under terms that permit, the user to
 *        recombine or relink the Application with a modified version of
 *        the Linked Version to produce a modified Combined Work, in the
 *        manner specified by section 6 of the GNU GPL for conveying
 *        Corresponding Source.
 *
 *        1) Use a suitable shared library mechanism for linking with the
 *        Library.  A suitable mechanism is one that (a) uses at run time
 *        a copy of the Library already present on the user's computer
 *        system, and (b) will operate properly with a modified version
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 *
 *    e) Provide Installation Information, but only if you would otherwise
 *    be required to provide such information under section 6 of the
 *    GNU GPL, and only to the extent that such information is
 *    necessary to install and execute a modified version of the
 *    Combined Work produced by recombining or relinking the
 *    Application with a modified version of the Linked Version. (If
 *    you use option 4d0, the Installation Information must accompany
 *    the Minimal Corresponding Source and Corresponding Application
 *    Code. If you use option 4d1, you must provide the Installation
 *    Information in the manner specified by section 6 of the GNU GPL
 *    for conveying Corresponding Source.)
 *
 *   5. Combined Libraries.
 *
 *   You may place library facilities that are a work based on the
 * Library side by side in a single library together with other library
 * facilities that are not Applications and are not covered by this
 * License, and convey such a combined library under terms of your
 * choice, if you do both of the following:
 *
 *    a) Accompany the combined library with a copy of the same work based
 *    on the Library, uncombined with any other library facilities,
 *    conveyed under the terms of this License.
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 *    b) Give prominent notice with the combined library that part of it
 *    is a work based on the Library, and explaining where to find the
 *    accompanying uncombined form of the same work.
 *
 *   6. Revised Versions of the GNU Lesser General Public License.
 *
 *   The Free Software Foundation may publish revised and/or new versions
 * of the GNU Lesser General Public License from time to time. Such new
 * versions will be similar in spirit to the present version, but may
 * differ in detail to address new problems or concerns.
 *
 *   Each version is given a distinguishing version number. If the
 * Library as you received it specifies that a certain numbered version
 * of the GNU Lesser General Public License "or any later version"
 * applies to it, you have the option of following the terms and
 * conditions either of that published version or of any later version
 * published by the Free Software Foundation. If the Library as you
 * received it does not specify a version number of the GNU Lesser
 * General Public License, you may choose any version of the GNU Lesser
 * General Public License ever published by the Free Software Foundation.
 *
 *   If the Library as you received it specifies that a proxy can decide
 * whether future versions of the GNU Lesser General Public License shall
 * apply, that proxy's public statement of acceptance of any version is
 * permanent authorization for you to choose that version for the
 * Library.
 */
package dev.rafex.ether.rest.servers;

import java.util.EnumSet;
import java.util.logging.Logger;

import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.http.HttpServlet;

import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.thread.QueuedThreadPool;

import dev.rafex.ether.rest.filters.LogFilter;
import dev.rafex.ether.rest.servlets.UtilFilter;
import dev.rafex.ether.rest.servlets.UtilServlet;

public class Server {

	private final Logger LOGGER = Logger.getLogger(Server.class.getName());

	private final org.eclipse.jetty.server.Server server;
	private final ServerConnector connector;
	private final int port;
	private final String host;
	private final ServletContextHandler servletContextHandler;
	private final QueuedThreadPool queuedThreadPool;
	private final int maxThreads;
	private final int minThreads;
	private final int idleTimeout;

	private Server(final Builder builder) {
		try {
			Log.setLog(new dev.rafex.ether.rest.logger.Logger(java.util.logging.Logger.GLOBAL_LOGGER_NAME));
		} catch (final Exception e) {
			e.printStackTrace();
		}
		port = builder.port;
		host = builder.host;
		maxThreads = builder.maxThreads;
		minThreads = builder.minThreads;
		idleTimeout = builder.idleTimeout;
		queuedThreadPool = new QueuedThreadPool(maxThreads, minThreads, idleTimeout);
		server = new org.eclipse.jetty.server.Server(queuedThreadPool);

		LOGGER.info("Host: " + host);
		LOGGER.info("Puerto: " + port);
		LOGGER.info("Tiempo muerto: " + idleTimeout);
		LOGGER.info("Minimo de hilos: " + minThreads);
		LOGGER.info("Maximo de hilos: " + maxThreads);

		connector = new ServerConnector(server);
		connector.setPort(port);
		connector.setHost(host);
		server.addConnector(connector);
		servletContextHandler = new ServletContextHandler(ServletContextHandler.NO_SESSIONS);

		final FilterHolder filter = new FilterHolder(new LogFilter());
		filter.setName("LogFilter");

		servletContextHandler.addFilter(filter, "/*", EnumSet.of(DispatcherType.INCLUDE, DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.ASYNC));

		server.setHandler(servletContextHandler);

		LOGGER.info("Server construido");

	}

	public void run() throws Exception {
		try {
			if (server != null) {
				LOGGER.info("Server ejecutandose");
				server.start();
				server.join();
			}
		} catch (final InterruptedException e) {
			LOGGER.info("Error al unirse al server");
			LOGGER.warning(e.getMessage());
		} catch (final Exception e) {
			LOGGER.warning(e.getMessage());
		}
	}

	public void stop() {
		try {
			if (server != null) {
				server.stop();
				LOGGER.info("Server detenido");
			}
		} catch (final Exception e) {
			LOGGER.warning(e.getMessage());
		}
	}

	public void destroy() {
		try {
			if (server != null) {
				server.destroy();
				LOGGER.info("Server detenido");
			}
		} catch (final Exception e) {
			LOGGER.warning(e.getMessage());
		}
	}

	public void addServlet(final Class httpServlet) {
		if (servletContextHandler != null) {
			servletContextHandler.addServlet(httpServlet, UtilServlet.getBasePath(httpServlet));
			LOGGER.info("Se agrego servlet: [" + httpServlet + "] con la ruta: [" + UtilServlet.getBasePath(httpServlet) + "]");
		} else {
			LOGGER.warning("ServletContextHandler null");
			throw new NullPointerException("ServletContextHandler null");
		}
	}

	public void addFilter(final Class filter, final EnumSet dispatches) {
		final FilterHolder filterHolder = new FilterHolder(filter);
		filterHolder.setName(UtilFilter.getName(filter));

		if (servletContextHandler != null) {
			servletContextHandler.addFilter(filterHolder, UtilFilter.getBasePath(filter), dispatches);
			LOGGER.info("Se agrego filter: [" + filter + "] con la ruta: [" + UtilFilter.getBasePath(filter) + "]");
		} else {
			LOGGER.warning("ServletContextHandler null");
			throw new NullPointerException("ServletContextHandler null");
		}
	}

	public static class Builder {
		private int port;
		private String host;
		private int maxThreads;
		private int minThreads;
		private int idleTimeout;
		private static Server instance;

		public Builder() {
			port = 8080;
			host = "0.0.0.0";
			maxThreads = 100;
			minThreads = 10;
			idleTimeout = 3000;
		}

		public Builder maxThreads(final int maxThreads) {
			this.maxThreads = maxThreads;
			return this;
		}

		public Builder minThreads(final int minThreads) {
			this.minThreads = minThreads;
			return this;
		}

		public Builder timeout(final int idleTimeout) {
			this.idleTimeout = idleTimeout;
			return this;
		}

		public Builder host(final String host) {
			this.host = host;
			return this;
		}

		public Builder port(final int port) {
			this.port = port;
			return this;
		}

		public Server build() {
			if (instance == null) {
				synchronized (Server.class) {
					if (instance == null) {
						instance = new Server(this);
					}
				}
			}
			return instance;
		}
	}

}