EDIT

/**

* 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.bulkeditor.input;

import java.util.ArrayList;

import java.util.Comparator;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

import java.util.UUID;

import java.util.stream.Collectors;

import org.eclipse.core.runtime.ICoreRunnable;

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

import org.eclipse.jface.viewers.IStructuredSelection;

import ca.odell.glazedlists.BasicEventList;

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

import eu.etaxonomy.cdm.api.service.config.DeleteConfiguratorBase;

import eu.etaxonomy.cdm.api.service.config.IIdentifiableEntityServiceConfigurator;

import eu.etaxonomy.cdm.api.service.exception.ReferencedObjectUndeletableException;

import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;

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

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

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

import eu.etaxonomy.cdm.strategy.merge.IMergable;

import eu.etaxonomy.cdm.strategy.merge.MergeException;

import eu.etaxonomy.taxeditor.annotatedlineeditor.IEntityCreator;

import eu.etaxonomy.taxeditor.annotatedlineeditor.IEntityPersistenceService;

import eu.etaxonomy.taxeditor.bulkeditor.BulkEditorQuery;

import eu.etaxonomy.taxeditor.bulkeditor.IBulkEditorSortProvider;

import eu.etaxonomy.taxeditor.bulkeditor.input.sortprovider.CdmBaseSortProvider;

import eu.etaxonomy.taxeditor.bulkeditor.input.sortprovider.TitleCacheComparator;

import eu.etaxonomy.taxeditor.bulkeditor.internal.TaxeditorBulkeditorPlugin;

import eu.etaxonomy.taxeditor.editor.CdmEntitySessionInput;

import eu.etaxonomy.taxeditor.event.EventUtility;

import eu.etaxonomy.taxeditor.event.WorkbenchEventConstants;

import eu.etaxonomy.taxeditor.l10n.Messages;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.store.CdmStore;

/**

 * @author p.ciardelli

 * @created 25.06.2009

 * @version 1.0

 * @param <T>

 */

public abstract class AbstractBulkEditorInput<T extends CdmBase> extends CdmEntitySessionInput implements

    IEntityPersistenceService<T> {

    private static final String TYPE_PROPERTY = Messages.BulkEditorE4_TYPE;

    private static final String ID_PROPERTY = "Id"; //$NON-NLS-1$

    private static final String UUID_PROPERTY = "Uuid"; //$NON-NLS-1$

	private UUID entityUuid;

	private BasicEventList<T> model = new BasicEventList<>();

	private Map<T, DeleteConfiguratorBase> toDelete = new HashMap<>();

	private Set<T> saveCandidates = new HashSet<>();

	private Set<T> markedMergeCandidates = new HashSet<>();

	private T markedMergeTarget = null;

	private HashMap<T, Set<T>> mergedEntities = new HashMap<>();

	private IEntityCreator<T> entityCreator;

	private final ConversationHolder conversation;

    private Job searchJob;

	public AbstractBulkEditorInput() {

	    super(true);

	    this.conversation = CdmStore.createConversation();

	}

	static public AbstractBulkEditorInput NewInstance(BulkEditorInputType inputType) {

		return BulkEditorInputType.getInput(inputType);

	}

	public static AbstractBulkEditorInput NewInstance(IdentifiableEntity entity) {

		BulkEditorInputType inputType = BulkEditorInputType.getByType(entity.getClass());

		AbstractBulkEditorInput editorInput = NewInstance(inputType);

		editorInput.setEntityUuid(entity.getUuid());

		return editorInput;

	}

    public abstract String getName();

    public String getEditorName(){

        return getName();

    }

    protected int getPageSize(){

        return 100;

    }

	protected abstract List<T> listEntities(IIdentifiableEntityServiceConfigurator configurator);

	protected abstract long countEntities(IIdentifiableEntityServiceConfigurator configurator);

	protected abstract T loadEntity(UUID entityUuid);

    public List<String> getPropertyKeys(){

        List<String> properties = new ArrayList<>();

        properties.add(getName());

        properties.addAll(getPropertyKeys_internal());

        properties.add(TYPE_PROPERTY);

        properties.add(ID_PROPERTY);

        properties.add(UUID_PROPERTY);

        return properties;

    }

    protected abstract List<String> getPropertyKeys_internal();

    public Object getPropertyValue(T cdmBase, String property){

        if(property.equals(getName())){

            return getText(cdmBase);

        }else if(property.equals(TYPE_PROPERTY)){

            return getTypeText(cdmBase);

        }else if(property.equals(UUID_PROPERTY)){

            return cdmBase.getUuid();

        }else if(property.equals(ID_PROPERTY)){

            return cdmBase.getId();

        }

        return null;

    }

	public Comparator<T> getTitleComparator(){

	    return new TitleCacheComparator();

	}

	public void setMergeTarget(T t){

	    markedMergeTarget = t;

	}

    public Set<T> getMergeCandidates() {

        return markedMergeCandidates;

    }

    public T getMergeTarget() {

        return markedMergeTarget;

    }

	public void removeMergeTarget(){

	    markedMergeTarget = null;

	}

	public void addMergeCandidate(T t){

	    markedMergeCandidates.add(t);

	}

	public void removeMergeCandidate(T t){

		markedMergeCandidates.remove(t);

	}

    public void addToDelete(T t, DeleteConfiguratorBase config) {

        toDelete.put(t, config);

    }

    public void addSaveCandidate(T t){

        saveCandidates.add(t);

    }

	private void setEntityUuid(UUID entityUuid){

		this.entityUuid = entityUuid;

	}

	public UUID getEntityUuid() {

		return entityUuid;

	}

	public void performSearch(final BulkEditorQuery bulkEditorQuery, IStructuredSelection selection) {

	    //cancel previous search job

	    if(searchJob!=null && searchJob.getState()!=Job.NONE){

	        searchJob.cancel();

	        searchJob = null;

	        /*

	         * wait for a little while for the job to finish

	         * to avoid asynchronously loaded results of the

	         * previous search being shown in the next search

	         * (not critical but explicitly waiting for the job to finish

	         * could run into an endless loop by mistake)

	         */

	        try {

                Thread.sleep(500);

            } catch (InterruptedException e) {

            }

	    }

	    model.clear();

		if(getEntityUuid() != null){

			T entity = loadEntity(getEntityUuid());

			model.add(entity);

		}

		else if(bulkEditorQuery != null){

            IIdentifiableEntityServiceConfigurator configurator = bulkEditorQuery.getSearchConfigurator();

            // check for UUID search

            String titleSearchString = configurator.getTitleSearchString();

            try {

                UUID uuid = UUID.fromString(titleSearchString);

                T entity = loadEntity(uuid);

                //UUID search found -> add entity to list and return

                model.add(entity);

                return;

            } catch (IllegalArgumentException e) {

                // search string was no UUID

            }

            //-> continue with standard search

            int pageSize = configurator.getPageSize()!=null?configurator.getPageSize():getPageSize();

            configurator.setPageSize(pageSize);

			long count = countEntities(configurator);

			int totalWork = count>Integer.MAX_VALUE?Integer.MAX_VALUE:(int)count;

			String jobLabel = String.format(Messages.AbstractBulkEditorInput_LOADING, getName(), bulkEditorQuery.getSearchString());

	        searchJob = Job.create(jobLabel, (ICoreRunnable) monitor -> {

	            monitor.beginTask(jobLabel, totalWork);

	            int pageNumber = 0;

	            List<T> entities;

	            //load previously selected element

	            UUID selectedUuid = null;

	            if(selection!=null && selection.getFirstElement() instanceof CdmBase){

	                selectedUuid = ((CdmBase) selection.getFirstElement()).getUuid();

	                T entity = loadEntity(selectedUuid);

	                model.add(entity);

	            }

                do {

                    if (monitor.isCanceled()) {

                        break;

                    }

                    configurator.setPageNumber(pageNumber);

                    entities = listEntities(configurator);

                    addToModel(entities, selectedUuid);

                    pageNumber++;

                    monitor.worked(pageSize);

                    long workedLong = pageSize*pageNumber;

                    int loadedCount =  workedLong>Integer.MAX_VALUE?Integer.MAX_VALUE:(int)workedLong;

                    monitor.setTaskName(String.format(Messages.AbstractBulkEditorInput_LOADED, loadedCount, totalWork, getName()));

                    //Update selection

                    EventUtility.postAsyncEvent(WorkbenchEventConstants.BULK_EDITOR_SEARCH_FINISHED, selection);

                } while (!entities.isEmpty());

	            monitor.done();

	            EventUtility.postAsyncEvent(WorkbenchEventConstants.BULK_EDITOR_SEARCH_FINISHED, selection);

	        });

	        searchJob.schedule();

		}

	}

	private void addToModel(List<T> entities, UUID selectedUuid){

	    //filter pre-loaded previously selected element

	    if(selectedUuid!=null){

	        entities = entities.stream().filter(entity->!entity.getUuid().equals(selectedUuid)).collect(Collectors.toList());

	    }

	    /*

         * IMPORTANT!

         * Entities have to be loaded into the main session because they are

         * loaded in a parallel asynchronous thread

         */

        if(getCdmEntitySession()!=null){//is null when closing the bulk editor during loading

            getCdmEntitySession().load(entities, true);

        }

        model.addAll(entities);

	}

	public boolean isMergingEnabled() {

		return false;

	}

	public boolean isConvertingEnabled() {

		return false;

	}

	public boolean isMarkerTypeEditingEnabled(MarkerType markerType) {

		return false;

	}

	/** {@inheritDoc} */

	@Override

    public boolean merge(T entity, T mergeTarget) {

		if (entity instanceof IMergable) {

			try {

				CdmStore.getCommonService().merge(mergeTarget.getUuid(), entity.getUuid(), (Class<? extends CdmBase>)entity.getClass());

			} catch (MergeException e) {

				MessagingUtils.errorDialog(Messages.AbstractBulkEditorInput_MERGE_ERROR_TITLE,

						this,

						String.format(Messages.AbstractBulkEditorInput_MERGE_ERROR_MESSAGE, entity.getClass().getName()),

						TaxeditorBulkeditorPlugin.PLUGIN_ID,

						e,

						true);

			}

		}

		return true;

	}

	public void saveModel(){

	    saveModel(true);

	}

	public void saveModel(boolean resetMerge){

	    //delete entities

	    for(Entry<T, DeleteConfiguratorBase> entry:toDelete.entrySet()){

	        try {

                delete(entry.getKey(), entry.getValue());

            } catch (ReferencedObjectUndeletableException e) {

                e.printStackTrace();

            }

	    }

	    if (!saveCandidates.isEmpty()){

	        CdmStore.getService(saveCandidates.iterator().next()).merge(new ArrayList<>(saveCandidates), true);

        }

	    if(resetMerge){

	        //merge entities

	        for(T mergeTarget:mergedEntities.keySet()){

	            for (T mergeCandidate: mergedEntities.get(mergeTarget)){

	                merge(mergeCandidate, mergeTarget);

	            }

	        }

	    }

	    toDelete.clear();

	    saveCandidates.clear();

	    mergedEntities.clear();

	}

	/** {@inheritDoc} */

	@Override

    public T create(T entity) {

		return save(entity);

	}

	public IEntityCreator<T> getEntityCreator(){

		if(entityCreator == null){

			entityCreator = createEntityCreator();

		}

		return entityCreator;

	}

	protected abstract IEntityCreator<T> createEntityCreator();

	/**

	 * The default implementation returns an empty list of sort providers.

	 * @return

	 */

	public List<IBulkEditorSortProvider<T>> getSortProviders(){

		List<IBulkEditorSortProvider<T>> sortProviders = new ArrayList<IBulkEditorSortProvider<T>>();

		sortProviders.add(new CdmBaseSortProvider<T>());

		return sortProviders;

	}

	/**

	 * Returns a textual representation given object. The default implementation

	 * in the abstract base class returns the simple name of the class, this may

	 * be overwritten to something more specific in subclasses.

	 *

	 * @param entity

	 * @return a textual representation given object.

	 */

	public String getTypeText(Object entity){

		return entity.getClass().getSimpleName();

	}

	public String getText(T entity) {

		if(entity instanceof IdentifiableEntity){

			IdentifiableEntity identifiableEntity = (IdentifiableEntity) HibernateProxyHelper.deproxy(entity);

			String text = identifiableEntity.getTitleCache();

			return text;

		}

		return "No text. Implement in subclass"; //$NON-NLS-1$

	}

	public BasicEventList<T> getModel() {

		return model;

	}

	public boolean replaceInModel(T entity) {

	    int index = model.indexOf(entity);

	    if(index >= 0) {

	        model.set(index, entity);

	        return true;

	    } else {

	        return false;

	    }

	}

    @Override

    public List<T> getRootEntities() {

        return getModel();

    }

    @Override

    public Map<Object, List<String>> getPropertyPathsMap() {

        // TODO Auto-generated method stub

        return null;

    }

	public ConversationHolder getConversation() {

		return conversation;

	}

	public Set<T> getSaveCandidates() {

        return saveCandidates;

    }

    public HashMap<T, Set<T>> getMergedEntities() {

        return mergedEntities;

    }

    public void setMergedEntities(HashMap<T, Set<T>> mergedEntities) {

        this.mergedEntities = mergedEntities;

    }

}