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/**
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 * Copyright (C) 2007 EDIT
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 * European Distributed Institute of Taxonomy
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 * http://www.e-taxonomy.eu
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 *
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 * The contents of this file are subject to the Mozilla Public License Version 1.1
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 * See LICENSE.TXT at the top of this package for the full license terms.
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 */
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package eu.etaxonomy.taxeditor.store;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.sql.SQLException;
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import java.util.concurrent.CancellationException;
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import org.eclipse.core.runtime.IProgressMonitor;
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import org.eclipse.core.runtime.IStatus;
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import org.eclipse.core.runtime.Status;
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import org.eclipse.core.runtime.jobs.Job;
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import org.eclipse.jface.dialogs.ProgressMonitorDialog;
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import org.eclipse.jface.operation.IRunnableWithProgress;
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import org.eclipse.swt.widgets.Display;
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import org.springframework.core.io.Resource;
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import eu.etaxonomy.cdm.api.application.CdmApplicationController;
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import eu.etaxonomy.cdm.api.application.CdmApplicationRemoteController;
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import eu.etaxonomy.cdm.api.application.ICdmRepository;
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import eu.etaxonomy.cdm.config.CdmSourceException;
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import eu.etaxonomy.cdm.config.ICdmSource;
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import eu.etaxonomy.cdm.database.DbSchemaValidation;
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import eu.etaxonomy.cdm.database.ICdmDataSource;
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import eu.etaxonomy.cdm.model.common.DefinedTermBase;
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import eu.etaxonomy.cdm.model.metadata.CdmMetaData;
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import eu.etaxonomy.cdm.model.name.NomenclaturalStatusType;
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import eu.etaxonomy.cdm.model.name.Rank;
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import eu.etaxonomy.taxeditor.l10n.Messages;
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import eu.etaxonomy.taxeditor.model.AbstractUtility;
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import eu.etaxonomy.taxeditor.model.CdmProgressMonitorAdapter;
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import eu.etaxonomy.taxeditor.model.MessagingUtils;
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import eu.etaxonomy.taxeditor.remoting.source.ICdmRemoteSource;
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import eu.etaxonomy.taxeditor.store.internal.TaxeditorStorePlugin;
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import eu.etaxonomy.taxeditor.ui.dialog.LoginDialog;
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import eu.etaxonomy.taxeditor.ui.dialog.RemotingLoginDialog;
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import eu.etaxonomy.taxeditor.view.datasource.CdmDataSourceViewPart;
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/**
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 * @author n.hoffmann
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 * @created Dec 8, 2010
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 * @version 1.0
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 */
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class CdmStoreConnector extends Job {
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    private final Display display;
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    private final ICdmSource cdmSource;
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    private DbSchemaValidation dbSchemaValidation;
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    private final Resource applicationContextBean;
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    /**
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     * @param datasource
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     * @param dbSchemaValidation
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     * @param applicationContextBean
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     */
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    public CdmStoreConnector(Display display,
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            ICdmSource cdmSource,
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            DbSchemaValidation dbSchemaValidation,
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            Resource applicationContextBean) {
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        super(String.format(Messages.CdmStoreConnector_CREATING_DATAMODEL, cdmSource));
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        this.display = display;
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        this.cdmSource = cdmSource;
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        this.dbSchemaValidation = dbSchemaValidation;
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        this.applicationContextBean = applicationContextBean;
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    }
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    @Override
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    public IStatus run(final IProgressMonitor monitor) {
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        monitor.beginTask(getConnectionMessage(), 10);
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        // check if database is up and running
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        checkDatabaseReachable(monitor);
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        if (!monitor.isCanceled()) {
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            // check if the datasource actually holds data
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            checkIsNonEmptyCdmDatabase(monitor);
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        }
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        if (dbSchemaValidation != DbSchemaValidation.CREATE
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                && !monitor.isCanceled()) {
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            // if we do not create the datasource, we want to check if the
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            // datasource is compatible with this editor
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            checkDbSchemaVersionCompatibility(monitor);
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        }
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        // we are done with our low level checking and will free resources now
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        cdmSource.closeOpenConnections();
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        if (!monitor.isCanceled()) {
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            CdmStore.close(monitor);
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        }
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        ICdmRepository applicationController = null;
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        if (!monitor.isCanceled()) {
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            CdmProgressMonitorAdapter subprogressMonitor = CdmProgressMonitorAdapter
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                    .CreateSubMonitor(monitor, 7);
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            // This is where we instantiate the application controller
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            int oldPriority = Thread.currentThread().getPriority();
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            try {
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                Thread.currentThread().setPriority(10);
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                applicationController = getApplicationController(cdmSource,subprogressMonitor);
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                MessagingUtils.informationDialog(Messages.CdmStoreConnector_SUCCESS, Messages.CdmStoreConnector_DATA_MODEL_CREATION_SUCCESSFUL);
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                CdmDataSourceViewPart dataSourceView = (CdmDataSourceViewPart) AbstractUtility.getView("eu.etaxonomy.taxeditor.view.datasource", false);
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                if(dataSourceView!=null){
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                    dataSourceView.refresh();
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                }
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                return Status.OK_STATUS;
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            } catch (Exception e) {
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                if(! causeIsCancelationExceptionRecursive(e)){
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                    MessagingUtils.errorDialog(Messages.CdmStoreConnector_COULD_NOT_CREATE_DATAMODEL, CdmStoreConnector.class,
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                    		String.format(Messages.CdmStoreConnector_ERROR_DURING_DATAMODEL_CREATION, cdmSource.getName()), TaxeditorStorePlugin.PLUGIN_ID, e, true);
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                    return Status.CANCEL_STATUS;
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                }
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            } finally {
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                monitor.done();
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                Thread.currentThread().setPriority(oldPriority);
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            }
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        }
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        return Status.CANCEL_STATUS;
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    }
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    public void start(final RemotingLoginDialog loginDialog) {
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        // hide login dialog and start connection dialog
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        loginDialog.setMessage(null);
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        loginDialog.hide(true);
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        ProgressMonitorDialog dialog = new ProgressMonitorDialog(StoreUtil.getShell());
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        try {
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            dialog.run(true, true, new IRunnableWithProgress() {
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                @Override
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                public void run(final IProgressMonitor monitor) {
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                    try {
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                        monitor.beginTask(getConnectionMessage(), 7);
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                        // check if database is up and running
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                        checkDatabaseReachable(monitor);
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                        // check if the datasource actually holds data
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                        checkIsNonEmptyCdmDatabase(monitor);
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                        if (dbSchemaValidation != DbSchemaValidation.CREATE) {
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                            // if we do not create the datasource, we want to check if the
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                            // datasource is compatible with this editor
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                            checkDbSchemaVersionCompatibility(monitor);
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                        }
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                        // we are done with our low level checking and will free resources now
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                        cdmSource.closeOpenConnections();
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                        display.syncExec(new Runnable() {
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                            /*
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                             * (non-Javadoc)
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                             *
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                             * @see java.lang.Runnable#run()
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                             */
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                            @Override
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                            public void run() {
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                                // close the current context
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                                CdmStore.close(monitor, false);
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                            }
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                        });
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                        ICdmRepository applicationController = null;
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                        if (!monitor.isCanceled()) {
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                            CdmProgressMonitorAdapter subprogressMonitor = CdmProgressMonitorAdapter
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                                    .CreateSubMonitor(monitor, 3);
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                            // genrerate new application controller
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                            applicationController = getApplicationController(cdmSource,subprogressMonitor);
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                        }
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                        if (!monitor.isCanceled()) {
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                            CdmStore.setInstance(applicationController, cdmSource);
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                            monitor.subTask(Messages.CdmStoreConnector_AUTHENTICATING_USER);
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                            display.syncExec(new Runnable() {
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                                /*
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                                 * (non-Javadoc)
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                                 *
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                                 * @see java.lang.Runnable#run()
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                                 */
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                                @Override
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                                public void run() {
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                                    try {
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                                        // create new security context
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                                        CdmStore.getLoginManager().doAuthenticate(loginDialog.getUsername(), loginDialog.getPassword());
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                                        loginDialog.onComplete();
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                                        CdmStore.getContextManager().notifyContextStart();
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                                        getInstance(Rank.class).resetTerms();
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                                        getInstance(NomenclaturalStatusType.class).resetTerms();
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                                        Rank.initDefaultTerms();
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                                        NomenclaturalStatusType.initDefaultTerms();
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                                    } catch(CdmAuthenticationException cae) {
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                                        loginDialog.hide(false);
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                                        loginDialog.setMessage(cae.getMessage());
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                                    }
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                                }
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                            });
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                        } else {
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                            throw new RuntimeException("Login cancelled");
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                        }
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                    } finally {
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                        monitor.done();
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                    }
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                }
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            });
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        } catch (InvocationTargetException e) {
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            loginDialog.hide(false);
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            loginDialog.setMessage(e.getMessage());
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        } catch (InterruptedException e) {
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            loginDialog.hide(false);
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            loginDialog.setMessage(e.getMessage());
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        }
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    }
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    /**
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     * Returns a new instance for the given class by using the default constructor.
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     * The constructor must be declared but can be unaccessible (e.g. private)
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     * @param termClass
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     * @return
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     */
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    private  <T extends DefinedTermBase> T getInstance(Class<? extends DefinedTermBase> termClass) {
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        try {
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            Constructor<T> c = ((Class<T>)termClass).getDeclaredConstructor();
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            c.setAccessible(true);
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            T termInstance = c.newInstance();
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            return termInstance;
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        } catch (Exception e) {
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            throw new RuntimeException(e);
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        }
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    }
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    private ICdmRepository getApplicationController(ICdmSource cdmSource, CdmProgressMonitorAdapter subprogressMonitor) {
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        if(cdmSource instanceof ICdmDataSource) {
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            return  CdmApplicationController.NewInstance(applicationContextBean,
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                    (ICdmDataSource)cdmSource,
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                    dbSchemaValidation,
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                    false,
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                    subprogressMonitor);
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        } else if(cdmSource instanceof ICdmRemoteSource) {
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            return CdmApplicationRemoteController.NewInstance((ICdmRemoteSource)cdmSource,
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                    subprogressMonitor,
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                    null);
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        } else {
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            throw new UnsupportedOperationException("Cannot create application controller for " + cdmSource.getName());
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        }
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    }
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    private void authenticate() {
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        LoginDialog saloginDialog = new LoginDialog(StoreUtil.getShell());
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        saloginDialog.open();
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    }
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    private void startContext() {
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        CdmStore.getContextManager().notifyContextStart();
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    }
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    /**
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     * @return
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     */
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    private String getConnectionMessage() {
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        return cdmSource.getConnectionMessage();
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    }
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    /**
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     * @return
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     * @throws SQLException
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     */
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    private void checkDbSchemaVersionCompatibility(IProgressMonitor monitor) {
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        monitor.subTask(Messages.CdmStoreConnector_CHECK_IF_EDITOR_IS_COMPATIBLE);
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        String dbSchemaVersion;
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        String message = null;
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        try {
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            dbSchemaVersion = cdmSource.getDbSchemaVersion();
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            // we assume that empty dbSchemaVersion means an empty database and
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            // skip version checking
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            if(dbSchemaVersion != null) {
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                int compareVersion = CdmMetaData.compareVersion(dbSchemaVersion, CdmMetaData.getDbSchemaVersion(), 3, null);
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                // if the datasource version is greater than the taxeditor compatible version then the taxeditor needs to
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                // be updated else the datasource needs to be updated
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                if(compareVersion > 0) {
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                    message = Messages.CdmStoreConnector_UPDATE_EDITOR_OR_CHOOSE_COMPATIBLE_DATASOURCE;
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                } else if (compareVersion < 0) {
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                    message = Messages.CdmStoreConnector_UPDATE_DATASOUREC_OR_CHOOSE_NEW_DATASOURCE;
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                }
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            }
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            monitor.worked(1);
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        } catch (CdmSourceException e) {
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            //
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        }
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        if (message != null) {
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            // Show an error message
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            MessagingUtils
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            .messageDialog(
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                    Messages.CdmStoreConnector_COMPATIBILITY_CHECK_FAILED,
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                    this,
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                    String.format(Messages.CdmStoreConnector_SCHEME_NOT_COMPATIBLE, cdmSource, message),
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                            null);
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            monitor.setCanceled(true);
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        }
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    }
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    private void checkIsNonEmptyCdmDatabase(IProgressMonitor monitor) {
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        monitor.subTask(Messages.CdmStoreConnector_CHECK_IF_NON_EMPTY);
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        boolean isDbEmpty = false;
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        try {
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            isDbEmpty = cdmSource.isDbEmpty();
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        } catch (CdmSourceException e) {
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            isDbEmpty = true;
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        }
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        if(isDbEmpty) {
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            dbSchemaValidation = DbSchemaValidation.CREATE;
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        }
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    }
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    private boolean causeIsCancelationExceptionRecursive(Throwable throwable){
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        if(throwable == null){
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            return false;
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        }else if(throwable instanceof CancellationException){
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            return true;
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        }else{
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            return causeIsCancelationExceptionRecursive(throwable.getCause());
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        }
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    }
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    private void checkDatabaseReachable(IProgressMonitor monitor) {
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        try {
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            monitor.subTask(Messages.CdmStoreConnector_CHECK_IF_REACHABLE);
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            cdmSource.checkConnection();
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            monitor.worked(1);
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        } catch (CdmSourceException e) {
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            MessagingUtils.messageDialog(Messages.CdmStoreConnector_COULD_NOT_CONNECT_TO_CHOSEN_DATASOURCE,
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                    this, Messages.CdmStoreConnector_REASON + e.getMessage(), e);
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            monitor.setCanceled(true);
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        }
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    }
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}
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