package config;

import java.io.IOException;
import java.net.ProxySelector;
import java.text.MessageFormat;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.Priority;

import com.btr.proxy.search.ProxySearch;
import com.btr.proxy.search.wpad.WpadProxySearchStrategy;
import com.btr.proxy.util.ProxyException;
import com.btr.proxy.util.Logger.LogBackEnd;
import com.btr.proxy.util.Logger.LogLevel;

/**
 * Configures the proxy
 * 
 * @author Jonathan Bauer
 */

public class ConfigProxy {

	/**
	 * Logger for this class
	 */
	private final static Logger LOGGER = Logger.getLogger(ConfigProxy.class);

	/**
	 * Initialization method.
	 */
	public static void init() throws IOException {
		// first setup the logger of proxy_vole
		com.btr.proxy.util.Logger.setBackend(new LogBackEnd() {

			@SuppressWarnings("deprecation")
			public void log(Class<?> clazz, LogLevel loglevel, String msg,
					Object... params) {
				Priority priority;
				switch (loglevel) {
				case ERROR:
					priority = Level.ERROR;
					break;
				case WARNING:
					priority = Priority.WARN;
					break;
				case INFO:
					priority = Priority.INFO;
					break;
				default:
					priority = Priority.DEBUG;
				}
				Logger.getLogger(clazz).log(priority, MessageFormat.format(msg, params));
			}

			public boolean isLogginEnabled(LogLevel logLevel) {
				return true;
			}
		});

		// try to find local proxy settings
		ProxySearch proxySearch = ProxySearch.getDefaultProxySearch();
		ProxySelector myProxySelector = proxySearch.getProxySelector();

		if (myProxySelector == null) {
			// didn't work, try WPAD detection
			LOGGER.error("No suitable proxy settings found, trying WPAD...");
			WpadProxySearchStrategy ss = new WpadProxySearchStrategy();
			try {
				myProxySelector = ss.getProxySelector();
			} catch (ProxyException e) {
				LOGGER.error("WPAD proxy error, see trace: ", e);
			}
		}
		// final check to see if WPAD actually worked
		if (myProxySelector != null) {
			LOGGER.debug("Proxy initialised.");
			ProxySelector.setDefault(myProxySelector);
		} else {
			LOGGER.error("Could not find a suitable proxy!");
		}
	}
}