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package org.ligoj.bootstrap.http.server;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.io.IOUtils;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.xml.XmlConfiguration;

/**
 * Jetty Http server launcher.
 */
@Slf4j
public final class Main {

	/**
	 * Attached server instance.
	 */
	private final Server server;

	/**
	 * Attached the last started server instance. Take care of thread safe issues. This enables server shutdown.
	 */
	private static volatile Server lastStartedServer;

	/**
	 * Constructor : load property and XmlConfiguration
	 * 
	 * @throws Exception
	 *             server start error.
	 */
	public Main() throws Exception {
		server = new Server();
		final String jettyPropertiesFile = System.getProperty("jetty.properties", "META-INF/jetty/jetty-dev.properties");
		InputStream propertiesInput = null;
		try {
			// Load the properties file
			propertiesInput = configure(jettyPropertiesFile);
		} finally {
			IOUtils.closeQuietly(propertiesInput);
		}
	}

	/**
	 * Return attached server.
	 * 
	 * @return attached server.
	 */
	public Server getServer() {
		return server;
	}

	/**
	 * Return the last started server instance. Take care of thread safe issues. This enables server shutdown.
	 * 
	 * @return the last started server instance. Take care of thread safe issues. This enables server shutdown.
	 */
	public static Server getLastStartedServer() {
		return lastStartedServer;
	}

	/**
	 * Configure the server from properties and XML.
	 */
	private InputStream configure(final String jettyPropertiesFile) throws Exception {
		final InputStream propertiesInput = Thread.currentThread().getContextClassLoader().getResourceAsStream(jettyPropertiesFile);
		if (propertiesInput == null) {
			log.error("Unable to find jetty properties file : " + jettyPropertiesFile);
		} else {

			// Copy the properties
			copyProperties(propertiesInput);

			// Configure the server
			new XmlConfiguration(
					Thread.currentThread().getContextClassLoader().getResource(System.getProperty("jetty.xml", "META-INF/jetty/jetty.xml")))
							.configure(server);
		}
		return propertiesInput;
	}

	/**
	 * Copy properties from the given input.
	 */
	private void copyProperties(final InputStream propertiesInput) throws IOException {
		final Properties properties = new Properties();
		properties.load(propertiesInput);
		properties.putAll(System.getProperties());
		System.setProperties(properties);
	}

	// CHECKSTYLE:OFF This is a real application entry
	/**
	 * Main launcher. Equals to mvn jetty:start command.
	 * 
	 * @param args
	 *            by design arguments, but not used.
	 * @throws Exception
	 *             server start error.
	 */
	public static void main(final String... args) throws Exception {
		// CHECKSTYLE:ON
		final Main main = new Main();
		main.server.start();

		// Update the last started server instance.
		lastStartedServer = main.server;
		try {
			main.server.join();
		} catch (final ThreadDeath td) {
			log.error("Unexpected server shutdown", td);
		}
	}
}