EDIT

// $Id$

/**

 * 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.ui.section;

import java.util.ArrayList;

import java.util.Collection;

import java.util.EnumSet;

import java.util.Observable;

import java.util.Observer;

import org.eclipse.jface.util.PropertyChangeEvent;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.DisposeEvent;

import org.eclipse.swt.events.DisposeListener;

import org.eclipse.swt.widgets.Composite;

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

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

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

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

import eu.etaxonomy.cdm.persistence.hibernate.CdmDataChangeMap;

import eu.etaxonomy.cdm.persistence.hibernate.permission.CRUD;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.store.CdmStore;

import eu.etaxonomy.taxeditor.store.LoginManager;

import eu.etaxonomy.taxeditor.store.StoreUtil;

import eu.etaxonomy.taxeditor.ui.element.AbstractCdmFormElement;

import eu.etaxonomy.taxeditor.ui.element.CdmFormFactory;

import eu.etaxonomy.taxeditor.ui.element.CdmPropertyChangeEvent;

import eu.etaxonomy.taxeditor.ui.element.ICdmFormElement;

import eu.etaxonomy.taxeditor.ui.element.IEnableableFormElement;

/**

 * <p>

 * Abstract AbstractCdmDetailElement class.

 * </p>

 *

 * @author n.hoffmann

 * @created Feb 26, 2010

 * @version 1.0

 */

public abstract class AbstractCdmDetailElement<T> extends AbstractCdmFormElement implements ICdmDetailElement<T>, Observer {

	private T entity;

	private boolean irrelevant;

	private boolean enabled;

	private EnumSet<CRUD> requiredCrud = null;

	/**

	 * <p>

	 * Constructor for AbstractCdmDetailElement.

	 * </p>

	 *

	 * @param formFactory

	 *            a {@link eu.etaxonomy.taxeditor.ui.element.CdmFormFactory}

	 *            object.

	 * @param formElement

	 *            a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement}

	 *            object.

	 * @param <T>

	 *            a T object.

	 */

	public AbstractCdmDetailElement(CdmFormFactory formFactory,

			ICdmFormElement formElement) {

		super(formFactory, formElement);

		// register as property change listener

		formFactory.addPropertyChangeListener(this);

		CdmStore.getLoginManager().addObserver(this);

		getLayoutComposite().getParent().addDisposeListener(new DisposeListener() {

            @Override

            public void widgetDisposed(DisposeEvent e) {

                CdmStore.getLoginManager().deleteObserver(AbstractCdmDetailElement.this);

            }

        });

	}

	/**

	 * Sets the entity and updates controls

	 *

	 * @param entity

	 *            a T object.

	 */

	@Override

    public void setEntity(T entity) {

        this.entity = entity;

        // the id is always 0 if the entity was not yet saved, so it is new in this case

        if(StoreUtil.getCdmEntity(getEntity()).getId() == 0) {

            // new entity, not yet saved

            requiredCrud = EnumSet.of(CRUD.CREATE);

        } else {

            requiredCrud = EnumSet.of(CRUD.UPDATE);

        }

        updateContent();

	}

	/*

	 * (non-Javadoc)

	 *

	 * @see eu.etaxonomy.taxeditor.forms.IEntityElement#getEntity()

	 */

	/**

	 * <p>

	 * Getter for the field <code>entity</code>.

	 * </p>

	 *

	 * @return a T object.

	 */

	@Override

    public T getEntity() {

		return entity;

	}

	/**

	 * Updates all widgets to display the latest data

	 */

	protected void updateContent() {

		removeElements();

		createControls(this, entity, SWT.WRAP);

		getLayoutComposite().layout();

		updateControlStates();

	}

	/*

	 * (non-Javadoc)

	 *

	 * @see

	 * eu.etaxonomy.taxeditor.forms.ISelectableComposite#setSelected(boolean)

	 */

	/** {@inheritDoc} */

	@Override

    public void setSelected(boolean selected) {

		Composite section = getLayoutComposite().getParent();

		section.setBackground(selected ? SELECTED : getPersistentBackground());

	}

	/**

	 * Sets all field to the given enablement state except the objects in

	 * collection except

	 *

	 * @see eu.etaxonomy.taxeditor.ui.element.IEnableableFormElement#setEnabled(boolean)

	 * @param enabled

	 *            a boolean.

	 * @param except

	 *            a {@link java.util.Collection} object.

	 */

	public void setEnabled(boolean enabled, Collection<Object> except) {

	    this.enabled = enabled;

		for (ICdmFormElement element : getElements()) {

			if (element instanceof IEnableableFormElement) {

				IEnableableFormElement enableableElement = (IEnableableFormElement) element;

				if (except != null && except.contains(enableableElement)) {

					// enableableElement.setEnabled(enabled);

				} else {

					enableableElement.setEnabled(enabled);

				}

			}

		}

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.ui.element.IEnableableFormElement#isEnabled()

	 */

	@Override

	public boolean isEnabled() {

	    return enabled;

	}

	/**

	 * <p>

	 * Setter for the field <code>irrelevant</code>.

	 * </p>

	 *

	 * @param irrelevant

	 *            a boolean.

	 * @param except

	 *            a {@link java.util.Collection} object.

	 */

	public void setIrrelevant(boolean irrelevant, Collection<Object> except) {

		// logger.warn("Setting " + this.getClass().getSimpleName() +

		// " to irrelevant state: " + irrelevant);

		for (ICdmFormElement element : getElements()) {

			if (element instanceof IEnableableFormElement) {

				IEnableableFormElement relevantElement = (IEnableableFormElement) element;

				if (except != null && except.contains(relevantElement)) {

					// do nothing

					// logger.warn("not setting elements irrelevance: " +

					// relevantElement.getClass().getSimpleName() + " in :" +

					// this.getClass().getSimpleName());

				} else {

					relevantElement.setIrrelevant(irrelevant);

				}

			}

		}

	}

	/** {@inheritDoc} */

	@Override

    public void setEnabled(boolean enabled) {

		setEnabled(enabled, null);

	}

	/** {@inheritDoc} */

	@Override

    public void setIrrelevant(boolean irrelevant) {

		this.irrelevant = irrelevant;

		setIrrelevant(irrelevant, null);

	}

	/**

	 * Create all content elements

	 *

	 * @param formElement

	 *            a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement}

	 *            object.

	 * @param entity

	 *            a T object.

	 * @param style

	 *            a int.

	 */

	protected abstract void createControls(ICdmFormElement formElement,

			T entity, int style);

	/** {@inheritDoc} */

	@Override

	public void propertyChange(PropertyChangeEvent event) {

		if (event == null) {

			return;

		}

		handleTitleCacheRelevantChange(event);

		Object eventSource = event.getSource();

		if (eventSource instanceof ICdmFormElement) {

			ICdmFormElement eventElement = (ICdmFormElement) eventSource;

			ICdmFormElement eventElementContainer = eventElement

					.getParentElement();

			if (eventElementContainer == this) {

				if (event instanceof CdmPropertyChangeEvent) {

					if (((CdmPropertyChangeEvent) event).hasException()) {

						handleException((CdmPropertyChangeEvent) event);

						return;

					}

				}

				// call specific handler implementation

				handleEvent(eventSource);

				// refire the event

				firePropertyChangeEvent(this, event);

				// update possible parents

				updateParentSection();

			}

		}

	}

	protected void handleTitleCacheRelevantChange(PropertyChangeEvent event) {

		boolean isRelevant = getEntity() instanceof TaxonNameBase

				|| getEntity() instanceof TaxonBase;

		isRelevant &= this instanceof AbstractIdentifiableEntityDetailElement;

		if (isRelevant) {

			((AbstractIdentifiableEntityDetailElement) this)

					.updateToggleableCacheField();

			updateParentSection();

		}

	}

	private void updateParentSection() {

		if (getParentElement() instanceof AbstractCdmDetailSection) {

			((AbstractCdmDetailSection) getParentElement()).updateTitle();

		}

	}

	/**

	 * Gets called when the source of the event is a child widget of this

	 * widget.

	 *

	 * @param eventSource

	 *            a {@link java.lang.Object} object.

	 */

	public abstract void handleEvent(Object eventSource);

	/**

	 * <p>

	 * handleException

	 * </p>

	 *

	 * @param event

	 *            a

	 *            {@link eu.etaxonomy.taxeditor.ui.element.CdmPropertyChangeEvent}

	 *            object.

	 */

	public void handleException(CdmPropertyChangeEvent event) {

		// override this in subclasses if you want to deal with the error

		MessagingUtils.error(event.getSource().getClass(), event.getException());

	}

	/**

	 * <p>

	 * isIrrelevant

	 * </p>

	 *

	 * @return a boolean.

	 */

	public boolean isIrrelevant() {

		return irrelevant;

	}

	/**

	 * <p>

	 * getConversationHolder

	 * </p>

	 *

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

	 *         object.

	 */

	@Override

    public ConversationHolder getConversationHolder() {

		if (getParentElement() instanceof IConversationEnabled) {

			return ((IConversationEnabled) getParentElement())

					.getConversationHolder();

		}

		throw new IllegalArgumentException(

				"Parent element should be IConversationEnabled");

	}

	/** {@inheritDoc} */

	@Override

    public void update(CdmDataChangeMap changeEvents) {

	}

	@Override

    public void update(Observable o, Object arg){

        if(o instanceof LoginManager){

            updateControlStates();

        }

    }

    protected void updateControlStates(){

        Collection<Object> except = new ArrayList<Object>();

        for(ICdmFormElement formElement:getElements()){

            if(formElement instanceof IEnableableFormElement && !((IEnableableFormElement) formElement).isEnabled()){

                except.add(formElement);

            }

        }

        setEnabled(getEntity() != null && CdmStore.currentAuthentiationHasPermission(StoreUtil.getCdmEntity(getEntity()), requiredCrud), except);

    }

}