/*
 * 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.dynres.web.bluemapcore;

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class WebServer extends Thread {

	private final int port;
	private final int maxConnections;
	private final InetAddress bindAdress;

	private HttpRequestHandler handler;
	
	private ThreadPoolExecutor connectionThreads;
	
	private ServerSocket server;

	public WebServer(int port, int maxConnections, InetAddress bindAdress, HttpRequestHandler handler) {
		this.port = port;
		this.maxConnections = maxConnections;
		this.bindAdress = bindAdress;
		
		this.handler = handler;
		
		connectionThreads = null;
	}
	
	@Override
	public void run(){
		close();

		connectionThreads = new ThreadPoolExecutor(maxConnections, maxConnections, 10, TimeUnit.SECONDS, new LinkedBlockingQueue<>());
		connectionThreads.allowCoreThreadTimeOut(true);
		
		try {
			server = new ServerSocket(port, maxConnections, bindAdress);
			server.setSoTimeout(0);
		} catch (IOException e){
			System.err.println("Error while starting the WebServer!");
			e.printStackTrace();
			return;
		}
		
		System.out.println("WebServer started.");
		
		while (!server.isClosed() && server.isBound()){

			try {
				Socket connection = server.accept();
				
				try {
					connectionThreads.execute(new HttpConnection(server, connection, handler, 10, TimeUnit.SECONDS));
				} catch (RejectedExecutionException e){
					connection.close();
					System.err.println("Dropped an incoming HttpConnection! (Too many connections?)");
				}
				
			} catch (SocketException e){
				// this mainly occurs if the socket got closed, so we ignore this error
			} catch (IOException e){
				System.err.println("Error while creating a new HttpConnection!");
				e.printStackTrace();
			}
			
		}

		System.out.println("WebServer closed.");
	}

	public int getPort() {
		return server.getLocalPort();
	}
	
	public void close(){
		if (connectionThreads != null) connectionThreads.shutdown();
		
		try {
			if (server != null && !server.isClosed()){
				server.close();
			}
		} catch (IOException e) {
			System.err.println("Error while closing WebServer!");
			e.printStackTrace();
		}
	}
	
}