package org.eclipse.wst.jsdt.debug.internal.crossfire;

import java.net.URI;
import java.net.URISyntaxException;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.core.runtime.Status;
import org.eclipse.wst.jsdt.debug.internal.crossfire.event.CFEventQueue;
import org.eclipse.wst.jsdt.debug.internal.crossfire.jsdi.CFMirror;
import org.eclipse.wst.jsdt.debug.internal.crossfire.transport.JSON;
import org.eclipse.wst.jsdt.debug.internal.crossfire.transport.CFPacket;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

/**
 * Crossfire {@link BundleActivator}
 * 
 * @since 1.0
 */
public class CrossFirePlugin extends Plugin {

	/**
	 * Id of the bundle
	 */
	public static final String PLUGIN_ID = "org.eclipse.wst.jsdt.debug.crossfire"; //$NON-NLS-1$
	/**
	 * CFPacket tracing option name
	 */
	public static final String TRC_PACKETS = PLUGIN_ID + "/packets"; //$NON-NLS-1$
	/**
	 * CFEventPacket queue tracing option name
	 */
	public static final String TRC_EVENTQUEUE = PLUGIN_ID + "/eventqueue"; //$NON-NLS-1$
	/**
	 * JSDI implementation tracing option name
	 */
	public static final String TRC_JSDI = PLUGIN_ID + "/jsdi"; //$NON-NLS-1$
	/**
	 * JSON parser tracing option
	 */
	public static final String TRC_JSON = PLUGIN_ID + "/json"; //$NON-NLS-1$
	
	/**
	 * Status code indicating an unexpected internal error.
	 */
	public static final int INTERNAL_ERROR = 120;
	
	private static CrossFirePlugin plugin = null;

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext bundleContext) throws Exception {
		super.start(bundleContext);
		plugin = this;
		configureTracing();
	}

	/* (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext bundleContext) throws Exception {
		try {
			plugin = null;
		}
		finally {
			super.stop(bundleContext);
		}
	}
	
	/**
	 * @return the singleton instance
	 */
	public static CrossFirePlugin getDefault() {
		return plugin;
	}
	
	/**
	 * Logs the specified status with this plug-in's log.
	 * 
	 * @param status status to log
	 */
	public static void log(IStatus status) {
		if (plugin != null) {
			plugin.getLog().log(status);
		}
	}

	/**
	 * Logs the specified throwable with this plug-in's log.
	 * 
	 * @param t throwable to log 
	 */
	public static void log(Throwable t) {
		log(newErrorStatus("Error logged from Crossfire Debug: ", t)); //$NON-NLS-1$
	}
	
	/**
	 * Logs an internal error with the specified message.
	 * 
	 * @param message the error message to log
	 */
	public static void logErrorMessage(String message) {
		log(newErrorStatus("Internal message logged from Crossfire Debug: " + message, null)); //$NON-NLS-1$	
	}
	
	/**
	 * Returns a new error status for this plug-in with the given message
	 * @param message the message to be included in the status
	 * @param exception the exception to be included in the status or <code>null</code> if none
	 * @return a new error status
	 */
	public static IStatus newErrorStatus(String message, Throwable exception) {
		return new Status(IStatus.ERROR, PLUGIN_ID, INTERNAL_ERROR, message, exception);
	}

	/**
	 * Turns on / off any tracing options
	 */
	public void configureTracing() {
		if(CrossFirePlugin.getDefault().isDebugging()) {
			String option = Platform.getDebugOption(TRC_PACKETS);
			if(option != null) {
				CFPacket.setTracing(Boolean.valueOf(option).booleanValue());
			}
			option = Platform.getDebugOption(TRC_EVENTQUEUE);
			if(option != null) {
				CFEventQueue.setTracing(Boolean.valueOf(option).booleanValue());
			}
			option = Platform.getDebugOption(TRC_JSDI);
			if(option != null) {
				CFMirror.setTracing(Boolean.valueOf(option).booleanValue());
			}
			option = Platform.getDebugOption(TRC_JSON);
			if(option != null) {
				JSON.setTracing(Boolean.valueOf(option).booleanValue());
			}
		}
	}
	
	/**
	 * Creates a new {@link URI} with the <code>file</code> scheme
	 * @param path
	 * @return a new {@link URI}
	 * @throws URISyntaxException
	 */
	public static URI fileURI(IPath path) throws URISyntaxException {
		return new URI(Constants.URI_FILE_SCHEME, null, path.makeAbsolute().toString(), null);
	}
}