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/**

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy

 * http://www.e-taxonomy.eu

 *

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.taxeditor.store;

import java.util.EnumSet;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.jobs.Job;

import org.eclipse.swt.widgets.Display;

import org.slf4j.Marker;

import org.springframework.core.io.ClassPathResource;

import org.springframework.core.io.Resource;

import org.springframework.security.authentication.AuthenticationManager;

import org.springframework.security.core.Authentication;

import org.springframework.security.core.GrantedAuthority;

import org.springframework.security.core.context.SecurityContext;

import org.springframework.security.core.context.SecurityContextHolder;

import eu.etaxonomy.cdm.api.application.CdmApplicationException;

import eu.etaxonomy.cdm.api.application.CdmApplicationRemoteController;

import eu.etaxonomy.cdm.api.application.CdmApplicationState;

import eu.etaxonomy.cdm.api.application.ICdmRepository;

import eu.etaxonomy.cdm.api.cache.CdmServiceCacher;

import eu.etaxonomy.cdm.api.conversation.ConversationHolder;

import eu.etaxonomy.cdm.api.service.IAgentService;

import eu.etaxonomy.cdm.api.service.IAnnotationService;

import eu.etaxonomy.cdm.api.service.IClassificationService;

import eu.etaxonomy.cdm.api.service.ICollectionService;

import eu.etaxonomy.cdm.api.service.ICommonService;

import eu.etaxonomy.cdm.api.service.IDescriptionService;

import eu.etaxonomy.cdm.api.service.IDescriptiveDataSetService;

import eu.etaxonomy.cdm.api.service.IEntityConstraintViolationService;

import eu.etaxonomy.cdm.api.service.IEntityValidationService;

import eu.etaxonomy.cdm.api.service.IGrantedAuthorityService;

import eu.etaxonomy.cdm.api.service.IGroupService;

import eu.etaxonomy.cdm.api.service.IMarkerService;

import eu.etaxonomy.cdm.api.service.IMediaService;

import eu.etaxonomy.cdm.api.service.INameService;

import eu.etaxonomy.cdm.api.service.IOccurrenceService;

import eu.etaxonomy.cdm.api.service.IPolytomousKeyNodeService;

import eu.etaxonomy.cdm.api.service.IPolytomousKeyService;

import eu.etaxonomy.cdm.api.service.IReferenceService;

import eu.etaxonomy.cdm.api.service.IRegistrationService;

import eu.etaxonomy.cdm.api.service.IRightsService;

import eu.etaxonomy.cdm.api.service.IService;

import eu.etaxonomy.cdm.api.service.ITaxonService;

import eu.etaxonomy.cdm.api.service.ITermNodeService;

import eu.etaxonomy.cdm.api.service.ITermService;

import eu.etaxonomy.cdm.api.service.ITermTreeService;

import eu.etaxonomy.cdm.api.service.IUserService;

import eu.etaxonomy.cdm.api.service.IVocabularyService;

import eu.etaxonomy.cdm.api.service.molecular.IAmplificationService;

import eu.etaxonomy.cdm.api.service.molecular.IPrimerService;

import  eu.etaxonomy.cdm.cache.CdmRemoteCacheManager;

import eu.etaxonomy.cdm.config.ICdmSource;

import eu.etaxonomy.cdm.database.DbSchemaValidation;

import eu.etaxonomy.cdm.model.agent.AgentBase;

import eu.etaxonomy.cdm.model.common.Annotation;

import eu.etaxonomy.cdm.model.common.CdmBase;

import eu.etaxonomy.cdm.model.common.Language;

import eu.etaxonomy.cdm.model.description.DescriptionBase;

import eu.etaxonomy.cdm.model.description.DescriptiveDataSet;

import eu.etaxonomy.cdm.model.description.PolytomousKey;

import eu.etaxonomy.cdm.model.description.PolytomousKeyNode;

import eu.etaxonomy.cdm.model.media.Media;

import eu.etaxonomy.cdm.model.media.Rights;

import eu.etaxonomy.cdm.model.molecular.Amplification;

import eu.etaxonomy.cdm.model.molecular.Primer;

import eu.etaxonomy.cdm.model.name.Registration;

import eu.etaxonomy.cdm.model.name.TaxonName;

import eu.etaxonomy.cdm.model.occurrence.Collection;

import eu.etaxonomy.cdm.model.occurrence.SpecimenOrObservationBase;

import eu.etaxonomy.cdm.model.permission.CRUD;

import eu.etaxonomy.cdm.model.permission.Group;

import eu.etaxonomy.cdm.model.reference.Reference;

import eu.etaxonomy.cdm.model.taxon.Classification;

import eu.etaxonomy.cdm.model.taxon.TaxonBase;

import eu.etaxonomy.cdm.model.term.DefinedTermBase;

import eu.etaxonomy.cdm.model.term.TermNode;

import eu.etaxonomy.cdm.model.term.TermTree;

import eu.etaxonomy.cdm.model.term.TermVocabulary;

import eu.etaxonomy.cdm.model.validation.EntityConstraintViolation;

import eu.etaxonomy.cdm.model.validation.EntityValidation;

import eu.etaxonomy.cdm.persistence.permission.ICdmPermissionEvaluator;

import eu.etaxonomy.cdm.persistence.permission.Role;

import eu.etaxonomy.taxeditor.io.ExportManager;

import eu.etaxonomy.taxeditor.io.ImportManager;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.preference.PreferencesUtil;

import eu.etaxonomy.taxeditor.session.ICdmEntitySessionManager;

import eu.etaxonomy.taxeditor.session.mock.MockCdmEntitySessionManager;

import eu.etaxonomy.taxeditor.store.internal.TaxeditorStorePlugin;

import eu.etaxonomy.taxeditor.ui.dialog.RemotingLoginDialog;

import eu.etaxonomy.taxeditor.util.ProgressMonitorClientManager;

/**

 * This implementation of ICdmDataRepository depends on hibernate sessions to

 * store the data correctly for the current session. No state is held in this

 * class.

 *

 * Only methods that either get or manipulate data are exposed here. So this

 * class acts as a facade for the methods in cdmlib-service.

 *

 * @author n.hoffmann

 * @created 17.03.2009

 */

public class CdmStore {

    public static final Resource DEFAULT_APPLICATION_CONTEXT = new ClassPathResource(

            "/eu/etaxonomy/cdm/editorApplicationContext.xml",

            TaxeditorStorePlugin.class);

    public static final DbSchemaValidation DEFAULT_DB_SCHEMA_VALIDATION = DbSchemaValidation.VALIDATE;

    protected static CdmStore instance;

    private static ContextManager contextManager = new ContextManager();

    private static LoginManager loginManager = new LoginManager();

    private static TermManager termManager = new TermManager();

    private static SearchManager searchManager = new SearchManager();

    private static UseObjectStore useObjectInitializer = new UseObjectStore();

    private static ProgressMonitorClientManager progressMonitorClientManager = new ProgressMonitorClientManager();

    private static CdmStoreConnector job;

//    private static CdmServer managedServer;

    private Language language;

    private ICdmSource cdmSource;

    private boolean isConnected;

    protected static CdmStore getDefault(boolean connecting){

        if (instance != null && instance.isConnected()) {

            return instance;

        } else{// if (instance == null || !instance.isConnected) {

            if (connecting){

                MessagingUtils.dataSourceNotAvailableWarningDialog(instance);

            }else{

                MessagingUtils.noDataSourceWarningDialog(instance);

            }

            return null;

        }

    }

    protected static CdmStore getDefault(){

       return getDefault(false);

    }

    /**

     * Initialize the with the last edited datasource

     * @deprecated this method is not needed anymore after fully changing to remoting.

     * Therefore it will be removed

     */

//    @Deprecated

//    public static void connect() {

//        try {

//            ICdmSource cdmSource = CdmDataSourceRepository.getCurrentCdmSource();

//            connect(cdmSource);

//        } catch (Exception e) {

//            MessagingUtils.messageDialog("Connection to CDM Source Failed", CdmStore.class, "Could not connect to target CDM Source", e);

//        }

//    }

    /**

     * Initialize with a specific datasource

     *

     * @param datasource

     *            a {@link eu.etaxonomy.cdm.database.ICdmDataSource} object.

     */

    public static void connect(ICdmSource cdmSource) {

        connect(cdmSource, DEFAULT_DB_SCHEMA_VALIDATION,

                DEFAULT_APPLICATION_CONTEXT);

    }

    public static void connect(ICdmSource cdmSource, RemotingLoginDialog loginDialog) {

        connect(cdmSource,

                DEFAULT_DB_SCHEMA_VALIDATION,

                DEFAULT_APPLICATION_CONTEXT,

                loginDialog);

    }

    /**

     * Initialize and provide

     *

     * @param datasource

     * @param dbSchemaValidation

     * @param applicationContextBean

     */

    private static void connect(final ICdmSource cdmSource,

            final DbSchemaValidation dbSchemaValidation,

            final Resource applicationContextBean) {

        MessagingUtils.info("Connecting to datasource: " + cdmSource);

        job = new CdmStoreConnector(Display.getDefault(), cdmSource,

                dbSchemaValidation, applicationContextBean);

        job.setUser(true);

        job.setPriority(Job.BUILD);

        job.schedule();

    }

    private static void connect(final ICdmSource cdmSource,

            final DbSchemaValidation dbSchemaValidation,

            final Resource applicationContextBean,

            RemotingLoginDialog remotingLoginDialog) {

        RemotingLoginDialog loginDialog = remotingLoginDialog;

        if(isActive()) {

            // before we connect we clear the entity caches and the sessions

           CdmRemoteCacheManager.removeEntityCaches();

            if(getCurrentSessionManager(true) != null) {

                getCurrentSessionManager(true).disposeAll();

            }

        }

        MessagingUtils.info("Connecting to datasource: " + cdmSource);

        job = new CdmStoreConnector(Display.getDefault(),

                cdmSource,

                dbSchemaValidation,

                applicationContextBean);

        job.start(loginDialog);

    }

    public static boolean isConnecting() {

        return job != null && job.getState() == Job.RUNNING;

    }

    /**

     * Closes the current application context

     *

     * @param monitor

     *            a {@link org.eclipse.core.runtime.IProgressMonitor} object.

     */

    public static void close(final IProgressMonitor monitor) {

        Display.getDefault().asyncExec(new Runnable() {

            @Override

            public void run() {

                getContextManager().notifyContextAboutToStop(monitor);

                if ((monitor == null || (!monitor.isCanceled()) && isActive())) {

                    getContextManager().notifyContextStop(monitor);

                    instance.close();

                }

            }

        });

    }

    public static void close(IProgressMonitor monitor, boolean async) {

        if(async) {

            close(monitor);

        } else {

            getContextManager().notifyContextAboutToStop(monitor);

            if ((monitor == null || (!monitor.isCanceled()) && isActive())) {

                getContextManager().notifyContextStop(monitor);

                instance.close();

            }

        }

    }

    private void close() {

        this.setConnected(false);

        this.cdmSource = null;

        CdmApplicationState.dispose();

    }

    public static void setInstance(ICdmRepository applicationController,

            ICdmSource cdmSource) {

        instance = new CdmStore(applicationController, cdmSource);

        CdmApplicationState.setCdmServiceCacher(new CdmServiceCacher());

    }

    protected CdmStore(ICdmRepository repository,

            ICdmSource cdmSource) {

        CdmApplicationState.setCurrentAppConfig(repository);

        CdmApplicationState.setCurrentDataChangeService(new CdmUIDataChangeService());

        this.cdmSource = cdmSource;

        setConnected(true);

    }

    /**

     * All calls to the datastore require

     *

     * @return

     */

    private ICdmRepository getApplicationConfiguration() {

        try {

            return CdmApplicationState.getCurrentAppConfig();

        } catch (Exception e) {

            MessagingUtils.error(CdmStore.class, e);

        }

        return null;

    }

    public static ICdmRepository getCurrentApplicationConfiguration() {

        if (getDefault() != null) {

            return getDefault().getApplicationConfiguration();

        }

        return null;

    }

    /*

     * CONVERSATIONS

     */

    /**

     * Creates a new conversation, binds resources to the conversation and start

     * a transaction for this conversation.

     *

     * @return a {@link eu.etaxonomy.cdm.api.conversation.ConversationHolder}

     *         object.

     */

    public static ConversationHolder createConversation() {

        ConversationHolder conversation = getCurrentApplicationConfiguration()

                .NewConversation();

        try {

            conversation.startTransaction();

        }catch(Exception e){

            MessagingUtils.messageDialog("No database connection", CdmStore.class, "No database connection available", e);

        }

        return conversation;

    }

    //FIXME:Remoting should be removed after moving completely to remoting

    private MockCdmEntitySessionManager mockCdmEntitySessionManager;

    private ICdmEntitySessionManager getSessionManager() {

        //FIXME:Remoting we should only have CdmApplicationRemoteConfiguration after move to remoting

        //               bad hack which should be finally removed

        if(getCurrentApplicationConfiguration() instanceof CdmApplicationRemoteController) {

            return ((CdmApplicationRemoteController)getCurrentApplicationConfiguration()).getCdmEntitySessionManager();

        } else {

            if(mockCdmEntitySessionManager == null) {

                mockCdmEntitySessionManager = new MockCdmEntitySessionManager();

            }

            return mockCdmEntitySessionManager;

        }

    }

    public static  ICdmEntitySessionManager getCurrentSessionManager() {

        return getCurrentSessionManager(false);

    }

    public static  ICdmEntitySessionManager getCurrentSessionManager(boolean connecting) {

        if (getDefault(connecting) != null) {

            return getDefault(connecting).getSessionManager();

        }

        return null;

    }

    /**

     * Generic method that will scan the getters of {@link ICdmRepository} for the given service

     * interface. If a matching getter is found the according service implementation is returned by

     * invoking the getter otherwise the method returns <code>null</code>.

     *

     * @param <T>

     * @param serviceClass

     * @return the configured implementation of <code>serviceClass</code> or <code>null</code>

     */

    public static <T extends IService> T getService(Class<T> serviceClass) {

        T service = null;

        try {

            service = CdmApplicationState.getService(serviceClass);

        } catch (CdmApplicationException cae) {

            MessagingUtils.error(CdmStore.class, cae);

        }

        return service;

    }

    /**

     * @see #getService(Class)

     * As ICommonService is not extending IService we need a specific request here

     */

    public static ICommonService getCommonService() {

        return CdmApplicationState.getCommonService();

    }

    public static AuthenticationManager getAuthenticationManager() {

        return getCurrentApplicationConfiguration().getAuthenticationManager();

    }

    public static ICdmPermissionEvaluator getPermissionEvaluator() {

        return getCurrentApplicationConfiguration().getPermissionEvaluator();

    }

    /*

     * SECURITY RELATED CONVENIENCE METHODS

     */

    /**

     * @see org.springframework.security.access.PermissionEvaluator#hasPermission(org.springframework.security.core.Authentication, java.lang.Object, java.lang.Object)

     *

     * @param targetDomainObject

     * @param permission

     * @return

     */

    public static boolean currentAuthentiationHasPermission(CdmBase targetDomainObject, EnumSet<CRUD> permission){

        //TODO use getCurrentApplicationConfiguration().currentAuthentiationHasPermission(CdmBase targetDomainObject, Operation permission) instead

        SecurityContext context = SecurityContextHolder.getContext();

        boolean hasPermission = false;

        try {

            hasPermission = getPermissionEvaluator().hasPermission(context.getAuthentication(), targetDomainObject,

                    permission);

        } catch (org.springframework.security.access.AccessDeniedException e) {

            /* IGNORE */

        }

        return hasPermission;

    }

    /**

     * @see org.springframework.security.access.PermissionEvaluator#hasPermission(org.springframework.security.core.Authentication, java.lang.Object, java.lang.Object)

     *

     * @param targetDomainObject

     * @param permission

     * @return

     */

    public static boolean currentAuthentiationHasPermission(Class<? extends CdmBase> targetType, EnumSet<CRUD> permission){

        boolean hasPermission = false;

        try {

            hasPermission = getPermissionEvaluator().hasPermission(getCurrentAuthentiation(), null, targetType.getName(), permission);

        } catch (org.springframework.security.access.AccessDeniedException e) {

            /* IGNORE */

        }

        return hasPermission;

    }

    public static boolean currentAuthentiationHasOneOfRoles(Role ... roles){

        boolean hasPermission = false;

        try {

            hasPermission =  getPermissionEvaluator().hasOneOfRoles(getCurrentAuthentiation(), roles);

        } catch (org.springframework.security.access.AccessDeniedException e) {

            /* IGNORE */

        }

        return hasPermission;

    }

    public static Authentication getCurrentAuthentiation() {

        SecurityContext context = SecurityContextHolder.getContext();

        return context.getAuthentication();

    }

    /*

     * LANGUAGE

     */

    /**

     * Provides access to the global default language set in the application preferences.

     *

     * @return a {@link eu.etaxonomy.cdm.model.common.Language} object.

     */

    public static Language getDefaultLanguage() {

        if (getDefault().getLanguage() == null) {

            getDefault().setLanguage(PreferencesUtil.getGlobalLanguage());

        }

        return getDefault().getLanguage();

    }

    public static void setDefaultLanguage(Language language) {

        getDefault().setLanguage(language);

    }

    private Language getLanguage() {

        return language;

    }

    private void setLanguage(Language language) {

        this.language = language;

    }

    /*

     * LOGIN

     */

    public static LoginManager getLoginManager() {

        return loginManager;

    }

    public static ContextManager getContextManager() {

        return contextManager;

    }

    public static TermManager getTermManager() {

        return termManager;

    }

    public static SearchManager getSearchManager() {

        return searchManager;

    }

    public static ProgressMonitorClientManager getProgressMonitorClientManager() {

        return progressMonitorClientManager;

    }

    /*

     * IMPORT/EXPORT FACTORIES

     */

    public static ImportManager getImportManager() {

        return ImportManager.NewInstance(getCurrentApplicationConfiguration());

    }

    public static ExportManager getExportManager() {

        return ExportManager.NewInstance(getCurrentApplicationConfiguration());

    }

    /**

     * Whether this CdmStore is currently connected to a datasource

     *

     * @return a boolean.

     */

    public static boolean isActive() {

        return instance != null && instance.isConnected();

    }

    public static ICdmSource getActiveCdmSource() {

        if (isActive()) {

            return instance.getCdmSource();

        }

        return null;

    }

    private ICdmSource getCdmSource() {

        return cdmSource;

    }

    @SuppressWarnings("unchecked")

    public static <T extends CdmBase> IService<T> getService(T cdmBase){

        IService<T> service = null;

        if(cdmBase!=null){

            //get corresponding service

            if(cdmBase.isInstanceOf(Reference.class)){

                service = (IService<T>) getService(IReferenceService.class);

            }

            else if (cdmBase.isInstanceOf(AgentBase.class)){

                service = (IService<T>) getService(IAgentService.class);

            }

            else if (cdmBase instanceof TaxonName) {

                service = (IService<T>) getService(INameService.class);

            }

            else if (cdmBase instanceof TaxonBase) {

                service = (IService<T>) getService(ITaxonService.class);

            }

            else if (cdmBase instanceof SpecimenOrObservationBase) {

                service = (IService<T>) getService(IOccurrenceService.class);

            }

            else if (cdmBase instanceof Media) {

                service = (IService<T>) getService(IMediaService.class);

            }

            else if (cdmBase instanceof Collection) {

                service = (IService<T>) getService(ICollectionService.class);

            }

            else if (cdmBase instanceof eu.etaxonomy.cdm.model.permission.User) {

                service = (IService<T>) getService(IUserService.class);

            }

            else if (cdmBase instanceof Group) {

            	service = (IService<T>) getService(IGroupService.class);

            }

            else if (cdmBase instanceof DescriptiveDataSet) {

            	service = (IService<T>) getService(IDescriptiveDataSetService.class);

            }

            else if (cdmBase instanceof TermVocabulary<?>) {

            	service = (IService<T>) getService(IVocabularyService.class);

            }

            else if (cdmBase instanceof DefinedTermBase<?>) {

            	service = (IService<T>) getService(ITermService.class);

            }

            else if (cdmBase instanceof Primer) {

                service = (IService<T>) getService(IPrimerService.class);

            }

            else if (cdmBase instanceof Amplification) {

                service = (IService<T>) getService(IAmplificationService.class);

            }

            else if (cdmBase instanceof PolytomousKey) {

                service = (IService<T>) getService(IPolytomousKeyService.class);

            }

            else if (cdmBase instanceof PolytomousKeyNode) {

                service = (IService<T>) getService(IPolytomousKeyNodeService.class);

            }

            else if (cdmBase instanceof Annotation) {

                service = (IService<T>) getService(IAnnotationService.class);

            }

            else if (cdmBase instanceof Classification) {

                service = (IService<T>) getService(IClassificationService.class);

            }

            else if (cdmBase instanceof DescriptionBase<?>) {

                service = (IService<T>) getService(IDescriptionService.class);

            }

            else if (cdmBase instanceof EntityConstraintViolation) {

                service = (IService<T>) getService(IEntityConstraintViolationService.class);

            }

            else if (cdmBase instanceof EntityValidation) {

                service = (IService<T>) getService(IEntityValidationService.class);

            }

            else if (cdmBase instanceof TermNode) {

                service = (IService<T>) getService(ITermNodeService.class);

            }

            else if (cdmBase instanceof TermTree) {

                service = (IService<T>) getService(ITermTreeService.class);

            }

            else if (cdmBase instanceof GrantedAuthority) {

                service = (IService<T>) getService(IGrantedAuthorityService.class);

            }

            else if (cdmBase instanceof Marker) {

                service = (IService<T>) getService(IMarkerService.class);

            }

            else if (cdmBase instanceof Registration) {

                service = (IService<T>) getService(IRegistrationService.class);

            }

            else if (cdmBase instanceof Rights) {

                service = (IService<T>) getService(IRightsService.class);

            }

            else{

            	String message = "Service for entity of class %s not yet implemented in TaxEditor";

            	message = String.format(message, cdmBase.getClass().getSimpleName());

            	throw new RuntimeException(message);

            }

        }

        return service;

    }

//

//    public static void setManagedServer(ICdmServer server) {

//        managedServer = server;

//    }

//

//    public static ICdmServer getManagedServer() {

//        return managedServer;

    public boolean isConnected() {

        return isConnected;

    }

    public void setConnected(boolean isConnected) {

        this.isConnected = isConnected;

    }

}