/*
 * This file is part of BlueMap, licensed under the MIT License (MIT).
 *
 * Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package io.gitlab.jfronny.libjf.web.impl.util.bluemapcore;

import io.gitlab.jfronny.libjf.LibJf;

import java.io.IOException;
import java.net.*;
import java.util.concurrent.*;

public class HttpServer extends Thread {
	private int port;
	private int maxConnections;
	private final InetAddress bindAddress;

	private final HttpRequestHandler handler;

	private ThreadPoolExecutor connectionThreads;

	private final Runnable callback;

	private ServerSocket server;

	private State state = State.Initialized;

	public HttpServer(InetAddress bindAddress, int port, int maxConnections, HttpRequestHandler handler, Runnable startCallback) {
		super("LibJF HTTP Server");
		this.port = port;
		this.maxConnections = maxConnections;
		this.bindAddress = bindAddress;

		this.handler = handler;

		connectionThreads = null;

		this.callback = startCallback;
	}

	@Override
	public void run() {
		close();

		connectionThreads = new ThreadPoolExecutor(Math.min(maxConnections, 8), maxConnections, 10, TimeUnit.SECONDS, new LinkedBlockingQueue<>());

		try {
			server = new ServerSocket(port, maxConnections, bindAddress);
			server.setSoTimeout(1000);
		} catch (IOException e){
			state = State.Failed;
			LibJf.LOGGER.error("Error while starting the WebServer!", e);
			return;
		}

		callback.run();
		LibJf.LOGGER.info("WebServer started.");

		while (!server.isClosed() && server.isBound()){
			state = State.Running;
			try {
				Socket connection = server.accept();

				try {
					connectionThreads.execute(new HttpConnection(server, connection, handler, 10, TimeUnit.SECONDS));
				} catch (RejectedExecutionException e){
					connection.close();
					LibJf.LOGGER.warn("Dropped an incoming HttpConnection! (Too many connections?)");
				}

			} catch (SocketException | SocketTimeoutException e) {
				// ignored
			} catch (IOException e) {
				LibJf.LOGGER.error("Error while creating a new HttpConnection!", e);
			}
		}
		state = State.Closed;

		LibJf.LOGGER.info("WebServer closed.");
	}

	public int getPort() {
		return server == null ? port : server.getLocalPort();
	}

	public void setPort(int port) {
		this.port = port;
	}

	public void setMaxConnections(int maxConnections) {
		this.maxConnections = maxConnections;
	}

	public synchronized void close() {
		state = State.Closed;
		if (connectionThreads != null) connectionThreads.shutdown();

		try {
			if (server != null && !server.isClosed()){
				server.close();
			}
		} catch (IOException e) {
			LibJf.LOGGER.error("Error while closing WebServer!", e);
		}
	}

	public void waitUntilReady() throws InterruptedException {
		while (state == State.Initialized) Thread.sleep(1L);
	}

	enum State {
		Initialized, Running, Closed, Failed
	}
}