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package atom.content.pm;

import atom.content.Context;
import atom.security.CompositePolicy;

import javax.security.auth.login.AppConfigurationEntry;
import javax.security.auth.login.Configuration;
import javax.security.auth.spi.LoginModule;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.security.NoSuchAlgorithmException;
import java.security.Policy;
import java.security.URIParameter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.ServiceLoader;

/**
 * Special initialization class for the Atom Framework.
 *
 * @author Alex Voloshyn
 * @version 1.7 10/22/13
 */
public final class ApplicationContext {
    /**
     * Boolean flag for system initialization status.
     */
    private static volatile boolean initialized = false;
    /**
     * Atom application manifest XML file path.
     */
    private static final String MANIFEST = "META-INF/manifest.atom.xml";

    /**
     * Private constructor for non-instantiability.
     */
    private ApplicationContext() {
        super();
    }

    /**
     * Retrieve initialize status of the system.
     *
     * @return initialize status of the system
     */
    public static boolean isInitialized() {
        return initialized;
    }

    /**
     * Initialize this system. After this method call, system stars deploy all
     * available applications.
     */
    public static void initialize() {
        if (!isInitialized()) {

            // REGISTER LOGIN MODULES
            final List configs = new ArrayList<>();
            final ServiceLoader services =
                    ServiceLoader.load(LoginModule.class);
            if (services.iterator().hasNext()) {
                final LoginModule module = services.iterator().next();
                final AppConfigurationEntry entry = new AppConfigurationEntry(
                        module.getClass().getName(),
                        AppConfigurationEntry.LoginModuleControlFlag.REQUIRED,
                        Collections.emptyMap());
                configs.add(entry);
            }
            final AppConfigurationEntry[] array =
                    configs.toArray(new AppConfigurationEntry[configs.size()]);
            Configuration.setConfiguration(new Configuration() {
                @Override
                public AppConfigurationEntry[] getAppConfigurationEntry(
                        final String name) {
                    return array;
                }
            });

            // REGISTER POLICY
            final Policy defaultPolicy = Policy.getPolicy();
            final List policies = new ArrayList<>();
            policies.add(defaultPolicy);

            Enumeration urls;
            try {
                urls = Thread.currentThread().getContextClassLoader()
                        .getResources("jaas.policy");
            } catch (IOException e) {
                e.printStackTrace();
                urls = Collections.emptyEnumeration();
            }

            while (urls.hasMoreElements()) {
                final URL url = urls.nextElement();
                try {
                    final URIParameter uri = new URIParameter(url.toURI());
                    final Policy policy = Policy.getInstance("JavaPolicy", uri);
                    policies.add(policy);
                } catch (URISyntaxException | NoSuchAlgorithmException e) {
                    e.printStackTrace();
                }
            }

            final CompositePolicy p = new CompositePolicy(policies);
            Policy.setPolicy(p);

            if (System.getSecurityManager() == null) {
                System.setSecurityManager(new SecurityManager());
            }

            // REGISTER APPLICATIONS
            final PackageManager manager =
                    Context.getSystemService(PackageManager.class);

            // REGISTER SPI APPLICATIONS
            final ServiceLoader apps =
                    ServiceLoader.load(ApplicationInfo.class);
            for (ApplicationInfo app : apps) {
                manager.register(app.getPackageInfo());
                app.onRegister();
            }

            // REGISTER XML APPLICATIONS
            try {
                final JAXBContext context =
                        JAXBContext.newInstance(ApplicationInfo.class);
                final Unmarshaller unmarshaller = context.createUnmarshaller();
                final Enumeration xmls = Thread.currentThread()
                        .getContextClassLoader().getResources(MANIFEST);
                while (xmls.hasMoreElements()) {
                    final URL xml = xmls.nextElement();
                    final ApplicationInfo app =
                            (ApplicationInfo) unmarshaller.unmarshal(xml);
                    manager.register(app.getPackageInfo());
                    app.onRegister();
                }
            } catch (IOException | JAXBException e) {
                e.printStackTrace();
            }

            initialized = true;
        }
    }
}