package org.argeo.cms.internal.kernel;
   
   import java.io.File;
   import java.io.IOException;
   import java.io.PrintStream;
   import java.net.URI;
   import java.net.URISyntaxException;
   import java.net.URL;
   import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.security.PrivilegedAction;
  import java.security.URIParameter;
  import java.util.Dictionary;
  import java.util.Hashtable;
  import java.util.Properties;
  import java.util.TreeMap;
  import java.util.TreeSet;
  
  import javax.jcr.Repository;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  import javax.security.auth.Subject;
  import javax.security.auth.login.LoginContext;
  import javax.security.auth.login.LoginException;
  
  import org.apache.commons.logging.Log;
  import org.argeo.api.DataModelNamespace;
  import org.argeo.api.NodeConstants;
  import org.argeo.cms.CmsException;
  import org.osgi.framework.Bundle;
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.FrameworkUtil;
  import org.osgi.util.tracker.ServiceTracker;
  
  /** Package utilities */
  class KernelUtils implements KernelConstants {
  	final static String OSGI_INSTANCE_AREA = "osgi.instance.area";
  	final static String OSGI_CONFIGURATION_AREA = "osgi.configuration.area";
  
  	static void setJaasConfiguration(URL jaasConfigurationUrl) {
  		try {
  			URIParameter uriParameter = new URIParameter(jaasConfigurationUrl.toURI());
  			javax.security.auth.login.Configuration jaasConfiguration = javax.security.auth.login.Configuration
  					.getInstance("JavaLoginConfig", uriParameter);
  			javax.security.auth.login.Configuration.setConfiguration(jaasConfiguration);
  		} catch (Exception e) {
  			throw new CmsException("Cannot set configuration " + jaasConfigurationUrl, e);
  		}
  	}
  
  	static Dictionary<String, ?> asDictionary(Properties props) {
  		Hashtable<String, Object> hashtable = new Hashtable<String, Object>();
  		for (Object key : props.keySet()) {
  			hashtable.put(key.toString(), props.get(key));
  		}
  		return hashtable;
  	}
  
  	static Dictionary<String, ?> asDictionary(ClassLoader cl, String resource) {
  		Properties props = new Properties();
  		try {
  			props.load(cl.getResourceAsStream(resource));
  		} catch (IOException e) {
  			throw new CmsException("Cannot load " + resource + " from classpath", e);
  		}
  		return asDictionary(props);
  	}
  
  	static File getExecutionDir(String relativePath) {
  		File executionDir = new File(getFrameworkProp("user.dir"));
  		if (relativePath == null)
  			return executionDir;
  		try {
  			return new File(executionDir, relativePath).getCanonicalFile();
  		} catch (IOException e) {
  			throw new CmsException("Cannot get canonical file", e);
  		}
  	}
  
  	static File getOsgiInstanceDir() {
  		return new File(getBundleContext().getProperty(OSGI_INSTANCE_AREA).substring("file:".length()))
  				.getAbsoluteFile();
  	}
  
  	static Path getOsgiInstancePath(String relativePath) {
  		return Paths.get(getOsgiInstanceUri(relativePath));
  	}
  
  	static URI getOsgiInstanceUri(String relativePath) {
  		String osgiInstanceBaseUri = getFrameworkProp(OSGI_INSTANCE_AREA);
  		return safeUri(osgiInstanceBaseUri + (relativePath != null ? relativePath : ""));
  	}
  
  	static File getOsgiConfigurationFile(String relativePath) {
  		try {
  			return new File(new URI(getBundleContext().getProperty(OSGI_CONFIGURATION_AREA) + relativePath))
  					.getCanonicalFile();
  		} catch (Exception e) {
  			throw new CmsException("Cannot get configuration file for " + relativePath, e);
 		}
 	}
 
 	static String getFrameworkProp(String key, String def) {
 		String value = getBundleContext().getProperty(key);
 		if (value == null)
 			return def;
 		return value;
 	}
 
 	static String getFrameworkProp(String key) {
 		return getFrameworkProp(key, null);
 	}
 
 	// Security
 	// static Subject anonymousLogin() {
 	// Subject subject = new Subject();
 	// LoginContext lc;
 	// try {
 	// lc = new LoginContext(NodeConstants.LOGIN_CONTEXT_USER, subject);
 	// lc.login();
 	// return subject;
 	// } catch (LoginException e) {
 	// throw new CmsException("Cannot login as anonymous", e);
 	// }
 	// }
 
 	static void logFrameworkProperties(Log log) {
 		BundleContext bc = getBundleContext();
 		for (Object sysProp : new TreeSet<Object>(System.getProperties().keySet())) {
 			log.debug(sysProp + "=" + bc.getProperty(sysProp.toString()));
 		}
 		// String[] keys = { Constants.FRAMEWORK_STORAGE,
 		// Constants.FRAMEWORK_OS_NAME, Constants.FRAMEWORK_OS_VERSION,
 		// Constants.FRAMEWORK_PROCESSOR, Constants.FRAMEWORK_SECURITY,
 		// Constants.FRAMEWORK_TRUST_REPOSITORIES,
 		// Constants.FRAMEWORK_WINDOWSYSTEM, Constants.FRAMEWORK_VENDOR,
 		// Constants.FRAMEWORK_VERSION, Constants.FRAMEWORK_STORAGE_CLEAN,
 		// Constants.FRAMEWORK_LANGUAGE, Constants.FRAMEWORK_UUID };
 		// for (String key : keys)
 		// log.debug(key + "=" + bc.getProperty(key));
 	}
 
 	static void printSystemProperties(PrintStream out) {
 		TreeMap<String, String> display = new TreeMap<>();
 		for (Object key : System.getProperties().keySet())
 			display.put(key.toString(), System.getProperty(key.toString()));
 		for (String key : display.keySet())
 			out.println(key + "=" + display.get(key));
 	}
 
 	static Session openAdminSession(Repository repository) {
 		return openAdminSession(repository, null);
 	}
 
 	static Session openAdminSession(final Repository repository, final String workspaceName) {
 		ClassLoader currentCl = Thread.currentThread().getContextClassLoader();
 		Thread.currentThread().setContextClassLoader(KernelUtils.class.getClassLoader());
 		LoginContext loginContext;
 		try {
 			loginContext = new LoginContext(NodeConstants.LOGIN_CONTEXT_DATA_ADMIN);
 			loginContext.login();
 		} catch (LoginException e1) {
 			throw new CmsException("Could not login as data admin", e1);
 		} finally {
 			Thread.currentThread().setContextClassLoader(currentCl);
 		}
 		return Subject.doAs(loginContext.getSubject(), new PrivilegedAction<Session>() {
 
 			@Override
 			public Session run() {
 				try {
 					return repository.login(workspaceName);
 				} catch (RepositoryException e) {
 					throw new CmsException("Cannot open admin session", e);
 				}
 			}
 
 		});
 	}
 
 	static void asyncOpen(ServiceTracker<?, ?> st) {
 		Runnable run = new Runnable() {
 
 			@Override
 			public void run() {
 				st.open();
 			}
 		};
 		Activator.getInternalExecutorService().execute(run);
 //		new Thread(run, "Open service tracker " + st).start();
 	}
 
 	/**
 	 * @return the {@link BundleContext} of the {@link Bundle} which provided this
 	 *         class, never null.
 	 * @throws CmsException if the related bundle is not active
 	 */
 	static BundleContext getBundleContext(Class<?> clzz) {
 		Bundle bundle = FrameworkUtil.getBundle(clzz);
 		BundleContext bc = bundle.getBundleContext();
 		if (bc == null)
 			throw new CmsException("Bundle " + bundle.getSymbolicName() + " is not active");
 		return bc;
 	}
 
 	static BundleContext getBundleContext() {
 		return getBundleContext(KernelUtils.class);
 	}
 
 	static boolean asBoolean(String value) {
 		if (value == null)
 			return false;
 		switch (value) {
 		case "true":
 			return true;
 		case "false":
 			return false;
 		default:
 			throw new CmsException("Unsupported value for attribute " + DataModelNamespace.ABSTRACT + ": " + value);
 		}
 	}
 
 	private static URI safeUri(String uri) {
 		if (uri == null)
 			throw new CmsException("URI cannot be null");
 		try {
 			return new URI(uri);
 		} catch (URISyntaxException e) {
 			throw new CmsException("Dadly formatted URI " + uri, e);
 		}
 	}
 
 	private KernelUtils() {
 
 	}
 }