package org.eclipse.jst.jsf.core.jsfappconfig.internal;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IPath;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.util.EContentAdapter;
import org.eclipse.jst.jsf.common.internal.managedobject.AbstractManagedObject;
import org.eclipse.jst.jsf.core.jsfappconfig.IFacesConfigChangeListener;
import org.eclipse.jst.jsf.core.jsfappconfig.IJSFAppConfigLocater;
import org.eclipse.jst.jsf.core.jsfappconfig.IJSFAppConfigProvider;
import org.eclipse.jst.jsf.core.jsfappconfig.IJSFAppConfigProvidersChangeListener;
import org.eclipse.jst.jsf.core.jsfappconfig.JSFAppConfigProvidersChangeEvent;
import org.eclipse.jst.jsf.core.jsfappconfig.JSFAppConfigUtils;
import org.eclipse.jst.jsf.facesconfig.emf.ApplicationType;
import org.eclipse.jst.jsf.facesconfig.emf.BehaviorType;
import org.eclipse.jst.jsf.facesconfig.emf.ComponentType;
import org.eclipse.jst.jsf.facesconfig.emf.ConverterType;
import org.eclipse.jst.jsf.facesconfig.emf.FacesConfigExtensionType;
import org.eclipse.jst.jsf.facesconfig.emf.FacesConfigType;
import org.eclipse.jst.jsf.facesconfig.emf.FactoryType;
import org.eclipse.jst.jsf.facesconfig.emf.FromViewIdType;
import org.eclipse.jst.jsf.facesconfig.emf.LifecycleType;
import org.eclipse.jst.jsf.facesconfig.emf.ManagedBeanType;
import org.eclipse.jst.jsf.facesconfig.emf.NavigationRuleType;
import org.eclipse.jst.jsf.facesconfig.emf.PropertyResolverType;
import org.eclipse.jst.jsf.facesconfig.emf.ReferencedBeanType;
import org.eclipse.jst.jsf.facesconfig.emf.RenderKitType;
import org.eclipse.jst.jsf.facesconfig.emf.ResourceBundleType;
import org.eclipse.jst.jsf.facesconfig.emf.ValidatorType;
import org.eclipse.jst.jsf.facesconfig.emf.VariableResolverType;

/**
 * Abstract JSFAppConfigManager that implementers of {@link IJSFAppConfigManager} MUST
 * extend.
 * <p>
 * JSFAppConfigManager provides an entry point to an entire JSF application
 * configuration, which is defined in one or more application configuration
 * resource files.
 */
public abstract class AbstractJSFAppConfigManager 
	extends 	AbstractManagedObject 
	implements 	IJSFAppConfigManager { 

	/**
	 * The IProject
	 * @deprecated - use getProject()
	 */
	protected IProject _project;

	/**
	 * Collection of {@link IJSFAppConfigLocater} instances.
	 */
	protected List<IJSFAppConfigLocater> configLocaters;
	
	/**
	 * Collection of {@link IJSFAppConfigProvidersChangeListener} instances.
	 */
	protected List<IJSFAppConfigProvidersChangeListener> configProvidersChangeListeners;

	/**
	 * Map of application configuration model EMF classes to
	 * {@link IFacesConfigChangeListener} instances.
	 */
	protected Map<Class, IFacesConfigChangeListener> facesConfigChangeListeners;

	/**
	 * Single {@link FacesConfigChangeAdapter} instance.
	 */
	protected FacesConfigChangeAdapter facesConfigChangeAdapter;

	/**
	 * Constructor
	 * @param project
	 */
	public AbstractJSFAppConfigManager(final IProject project) {
		_project = project;
		initialize();
	}
	
	public IProject getProject() {
		return _project;
	}

	/**
	 * Initializes instance by:
	 * <ul>
	 *  <li>creating facesConfigChangeListeners collection, </li>
	 * 	<li>creating configProvidersChangeListeners collection, </li>
	 * 	<li>creating and populating configLocaters collection, </li>
	 * 	<li>invoking the startLocating() method on all configLocaters, </li>
	 * </ul>
	 */
	protected void initialize() {
		//create collections
		facesConfigChangeListeners = new HashMap<Class, IFacesConfigChangeListener>();
		configProvidersChangeListeners = new ArrayList<IJSFAppConfigProvidersChangeListener>();
		configLocaters = new ArrayList<IJSFAppConfigLocater>();
		//populate initial set of locaters
		populateConfigLocaters();
		//instruct locaters to start locating
		startConfigLocaters();
	}
	
	/**
	 * Populates configLocaters using @link IJSFAppConfigLocater} implementations
	 * from CompositeLocatorProviderStrategy
	 */
	protected void populateConfigLocaters() {		
		final CompositeJSFAppConfigLocatorProviderStrategy clps = new CompositeJSFAppConfigLocatorProviderStrategy(this.getProject());
		for (final IJSFAppConfigLocater locator : clps.getLocators()) {
			locator.setJSFAppConfigManager(this);
			configLocaters.add(locator);
		}		
	}

	/**
	 * Instructs set of {@link IJSFAppConfigLocater} instances to start
	 * locating JSF application configuration resources.
	 */
	protected void startConfigLocaters() {
		for (final IJSFAppConfigLocater configLocater : configLocaters) {
			configLocater.startLocating();
		}
	}
	
	/**
	 * Instructs set of {@link IJSFAppConfigLocater} instances to stop
	 * locating JSF application configuration resources.
	 */
	protected void stopConfigLocaters() {		
		for (final IJSFAppConfigLocater configLocater : configLocaters) {
			configLocater.stopLocating();
			configLocater.dispose();
		}
	}

	/**
	 * Called to respond to a change in the IProject instance to which this
	 * instance belongs. Changes the cached IProject instance, stops all config
	 * locaters, starts all config locaters.
	 * 
	 * @param newProject New IProject instance to which this manager belongs.
	 * @deprecated - SHOULD NOT USE
	 */
	protected void changeProject(final IProject newProject) {
		_project = newProject;
		stopConfigLocaters();
		startConfigLocaters();
	}

	public boolean addJSFAppConfigProvidersChangeListener(final IJSFAppConfigProvidersChangeListener listener) {
		return configProvidersChangeListeners.add(listener);
	}

	public boolean removeJSFAppConfigProvidersChangeListener(final IJSFAppConfigProvidersChangeListener listener) {
		return configProvidersChangeListeners.remove(listener);
	}

	public void notifyJSFAppConfigProvidersChangeListeners(final IJSFAppConfigProvider configProvider, final int eventType) {
		final JSFAppConfigProvidersChangeEvent event = new JSFAppConfigProvidersChangeEvent(configProvider, eventType);
		for (final IJSFAppConfigProvidersChangeListener listener : configProvidersChangeListeners) {
			listener.changedJSFAppConfigProviders(event);
		}
	}

	public Object addFacesConfigChangeListener(Class emfClass, IFacesConfigChangeListener listener) {
		/* 
		 * Get all models, which will ensure that each one has had a
		 * FacesConfigChangeAdapter added to it (if the model is updateable).
		 */
		getFacesConfigModels();
		return facesConfigChangeListeners.put(emfClass, listener);
	}

	public Object removeFacesConfigChangeListener(Class emfClass) {
		return facesConfigChangeListeners.remove(emfClass);
	}

	public void notifyFacesConfigChangeListeners(final Notification notification) {
		final Object emfFeature = notification.getFeature();
		if (emfFeature instanceof EStructuralFeature) {
			final Class emfClass = ((EStructuralFeature)emfFeature).getEType().getInstanceClass();
			final IFacesConfigChangeListener listener = facesConfigChangeListeners.get(emfClass);
			if (listener != null) {
				listener.notifyChanged(notification);
			}
		}
	}

	/**
	 * @return Set of {@link IJSFAppConfigProvider}s
	 */
	protected Set<IJSFAppConfigProvider> getJSFAppConfigProviders() {
		final Set<IJSFAppConfigProvider> allConfigProviders = new LinkedHashSet<IJSFAppConfigProvider>();
		final Iterator itConfigLocaters = configLocaters.iterator();
		while (itConfigLocaters.hasNext()) {
			final IJSFAppConfigLocater configLocater = (IJSFAppConfigLocater)itConfigLocaters.next();
			allConfigProviders.addAll(configLocater.getJSFAppConfigProviders());
		}
		return allConfigProviders;
	}

	/**
	 * Gets all {@link FacesConfigType} instances from all
	 * {@link IJSFAppConfigProvider} instances.
	 * 
	 * @return List of all {@link FacesConfigType} instances.
	 */
	protected List<FacesConfigType> getFacesConfigModels() {
		final List<FacesConfigType> facesConfigModels = new ArrayList<FacesConfigType>();		
		for(final IJSFAppConfigProvider configProvider : getJSFAppConfigProviders()) {			
			final FacesConfigType facesConfig = configProvider.getFacesConfigModel();
			if (facesConfig != null) {
				facesConfigModels.add(facesConfig);
			}
		}
		return facesConfigModels;
	}

//-----------------------  IManagedObject lifecycle methods ----------------------------//
    /**
     * Disposes of resources by:
     * <ul>
     *  <li>removing a resource change listener to the workspace</li>
     *  <li>removing instance as a session property of the IProject instance</li>
     *  <li>invoking the stopLocating() method on all configLocaters</li>
     *  <li>clearing the configLocaters collection</li>
     *  <li>clearing the configProvidersChangeListeners collection</li>
     *  <li>clearing the facesConfigChangeListeners collection</li>
     * </ul>
     */
    public void dispose() {
        //instruct locaters to stop locating
        stopConfigLocaters();
        //clear collections
        configLocaters.clear();
        configProvidersChangeListeners.clear();
        facesConfigChangeListeners.clear();
    }
    
	public void destroy() {
		// 		
	}

	public void checkpoint() {
		//		
	}
//-------------------------------------------------------------------------------------------------//	

	public List<ManagedBeanType> getManagedBeans() {
		final List<ManagedBeanType> allManagedBeans = new ArrayList<ManagedBeanType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {		
			final EList managedBeans = facesConfig.getManagedBean();
			allManagedBeans.addAll(managedBeans);
		}
		return allManagedBeans;
    }

    public final List<String> getPropertyResolvers()
    {
        final List<String> allPropertyResolvers = new ArrayList<String>();
        final List<ApplicationType> applications = getApplications();
        for (final ApplicationType  application : applications) 
        {
            for (final Iterator it = application.getPropertyResolver().iterator(); it.hasNext();)
            {
                final PropertyResolverType propRes = (PropertyResolverType) it.next();
                String propClass = propRes.getTextContent();
                if (propClass != null)
                {
                    propClass = propClass.trim();
                    if (!"".equals(propClass)) //$NON-NLS-1$
                    {
                        allPropertyResolvers.add(propClass);
                    }
                }
            }
        }
        return allPropertyResolvers;
	}

	public List<ValidatorType> getValidators() {
		final List<ValidatorType> allValidators = new ArrayList<ValidatorType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {	
			final EList validators = facesConfig.getValidator();
			allValidators.addAll(validators);
		}
		return allValidators;
	}

	public final List<String> getVariableResolvers()
    {
        final List<String> allVariableResolvers = new ArrayList<String>();
        final List<ApplicationType> applications = getApplications();      
        for ( final ApplicationType  application : applications)
        {           
            for (final Iterator it = application.getVariableResolver().iterator(); it.hasNext();)
            {
                final VariableResolverType varRes = (VariableResolverType) it.next();
                String varClass = varRes.getTextContent();
                if (varClass != null)
                {
                    varClass = varClass.trim();
                    if (!"".equals(varClass)) //$NON-NLS-1$
                    {
                        allVariableResolvers.add(varClass);
                    }
                }
            }
        }
        return allVariableResolvers;
    }

	public List<ConverterType> getConverters() {
		final List<ConverterType> allConverters = new ArrayList<ConverterType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList converters = facesConfig.getConverter();
			allConverters.addAll(converters);
		}
		return allConverters;
	}

	public List<NavigationRuleType> getNavigationRules() {
		final List<NavigationRuleType> allNavigationRules = new ArrayList<NavigationRuleType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList navigationRules = facesConfig.getNavigationRule();
			allNavigationRules.addAll(navigationRules);
		}
		return allNavigationRules;
	}

	public List<NavigationRuleType> getNavigationRulesForPage(final IFile pageFile) {
		final List<NavigationRuleType> navigationRulesForPage = new ArrayList<NavigationRuleType>();
		final IPath pageFilePath = JSFAppConfigUtils.getWebContentFolderRelativePath(pageFile);
		if (pageFilePath != null) {
			String pageFileString = pageFilePath.toString();
			if (!pageFileString.startsWith("/")) { //$NON-NLS-1$
				pageFileString = "/" + pageFileString; //$NON-NLS-1$
			}
			final List<NavigationRuleType> navigationRules = getNavigationRules();
			for (final NavigationRuleType navigationRule : navigationRules) {				
				FromViewIdType fromViewIdType = navigationRule.getFromViewId();
				if (fromViewIdType != null) {
					final String fromViewId = fromViewIdType.getTextContent();
					if (fromViewId != null && fromViewId.length() > 0) {
						if (!fromViewId.equals("*")) { //$NON-NLS-1$
							if (fromViewId.equals(pageFileString)) {
								//exact match
								navigationRulesForPage.add(navigationRule);
							} else if (fromViewId.endsWith("*")) { //$NON-NLS-1$
								final String prefixFromViewId = fromViewId.substring(0, fromViewId.length() - 1);
								if (pageFileString.startsWith(prefixFromViewId)) {
									//prefix match
									navigationRulesForPage.add(navigationRule);
								}
							}
						} else {
							//from-view-id == "*" - matches all pages
							navigationRulesForPage.add(navigationRule);
						}
					}
				} else {
					//no from-view-id element - matches all pages
					navigationRulesForPage.add(navigationRule);
				}
			}
		}
		return navigationRulesForPage;
	}

	public List<ApplicationType> getApplications() {
		final List<ApplicationType> allApplications = new ArrayList<ApplicationType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList applications = facesConfig.getApplication();
			allApplications.addAll(applications);
		}
		return allApplications;
	}

	public List<FactoryType> getFactories() {
		final List<FactoryType> allFactories = new ArrayList<FactoryType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList factories = facesConfig.getFactory();
			allFactories.addAll(factories);
		}
		return allFactories;
	}

	public List<ComponentType> getComponents() {
		final List<ComponentType> allComponents = new ArrayList<ComponentType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList components = facesConfig.getComponent();
			allComponents.addAll(components);
		}
		return allComponents;
	}

	public List<ReferencedBeanType> getReferencedBeans() {
		final List<ReferencedBeanType> allReferencedBeans = new ArrayList<ReferencedBeanType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {	
			final EList referencedBeans = facesConfig.getReferencedBean();
			allReferencedBeans.addAll(referencedBeans);
		}
		return allReferencedBeans;
	}

	public List<RenderKitType> getRenderKits() {
		final List<RenderKitType>  allRenderKits = new ArrayList<RenderKitType> ();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList renderKits = facesConfig.getRenderKit();
			allRenderKits.addAll(renderKits);
		}
		return allRenderKits;
	}

	public List<LifecycleType> getLifecycles() {
		final List<LifecycleType> allLifecycles = new ArrayList<LifecycleType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList lifecycles = facesConfig.getLifecycle();
			allLifecycles.addAll(lifecycles);
		}
		return allLifecycles;
	}

    public List<ResourceBundleType> getResourceBundles()
    {
        final List<ResourceBundleType> allResourceBundles = new ArrayList<ResourceBundleType>();
        for (final FacesConfigType facesConfig : getFacesConfigModels()) {
            for (final Iterator applicationIt = facesConfig.getApplication().iterator(); applicationIt.hasNext();)
            {
                final ApplicationType appType = (ApplicationType) applicationIt.next();
                allResourceBundles.addAll(appType.getResourceBundle());
            }
        }
        return allResourceBundles;
    }
    
    public List<BehaviorType> getBehaviors()
    {
		final List<BehaviorType> allBehaviors = new ArrayList<BehaviorType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {
			final EList behaviors = facesConfig.getBehavior();
			allBehaviors.addAll(behaviors);
		}
		return allBehaviors;
    }
    
    public List<FacesConfigExtensionType> getFacesConfigExtensions()
    {
		final List<FacesConfigExtensionType> allFCExts = new ArrayList<FacesConfigExtensionType>();
		for (final FacesConfigType facesConfig : getFacesConfigModels()) {	
			final EList fcExts = facesConfig.getFacesConfigExtension();
			allFCExts.addAll(fcExts);
		}
		return allFCExts;
    }

	public void addFacesConfigChangeAdapter(final FacesConfigType facesConfig) {
		if (facesConfig != null) {
			if (facesConfigChangeAdapter == null) {
				facesConfigChangeAdapter = new FacesConfigChangeAdapter();
			}
			facesConfig.eAdapters().add(facesConfigChangeAdapter);
		}
	}

	public void removeFacesConfigChangeAdapter(final FacesConfigType facesConfig) {
		if (facesConfig != null && facesConfigChangeAdapter != null) {
			facesConfig.eAdapters().remove(facesConfigChangeAdapter);
		}
	}

	/**
	 * FacesConfigChangeAdapter is an EMF adapter which provides a mechanism
	 * for notification of changes to features in any application configuration
	 * model for which {@link IFacesConfigChangeListener} instances have
	 * registered an interest.
	 * 
	 * @author Ian Trimble - Oracle
	 */
	class FacesConfigChangeAdapter extends EContentAdapter {
		/*
		 * (non-Javadoc)
		 * @see org.eclipse.emf.ecore.util.EContentAdapter#notifyChanged(org.eclipse.emf.common.notify.Notification)
		 */
		public void notifyChanged(final Notification notification) {
			super.notifyChanged(notification);
			notifyFacesConfigChangeListeners(notification);
		}
	}


}