/**
 * Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0 
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *         Florian Pirchner - Initial implementation
 */
package org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal;

import java.util.Locale;

import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.databinding.EMFObservables;
import org.eclipse.osbp.ecview.core.common.editpart.IElementEditpart;
import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableBindingEndpoint;
import org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableValueEndpoint;
import org.eclipse.osbp.ecview.core.extension.model.extension.ExtensionModelPackage;
import org.eclipse.osbp.ecview.core.extension.model.extension.YTextArea;
import org.eclipse.osbp.ecview.core.ui.core.editparts.extension.ITextAreaEditpart;
import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractFieldWidgetPresenter;
import org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.internal.util.Util;

import com.vaadin.data.util.ObjectProperty;
import com.vaadin.server.ErrorMessage;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;
import com.vaadin.ui.Field;
import com.vaadin.ui.TextArea;

/**
 * This presenter is responsible to render a text area on the given layout.
 */
public class TextAreaPresentation extends
		AbstractFieldWidgetPresenter<Component> {

	/** The model access. */
	private final ModelAccess modelAccess;
	
	/** The text area. */
	private CustomField textArea;
	
	/** The property. */
	private ObjectProperty<String> property;

	/**
	 * Constructor.
	 * 
	 * @param editpart
	 *            The editpart of that presenter
	 */
	public TextAreaPresentation(IElementEditpart editpart) {
		super((ITextAreaEditpart) editpart);
		this.modelAccess = new ModelAccess((YTextArea) editpart.getModel());
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Component doCreateWidget(Object parent) {
		if (textArea == null) {

			textArea = new CustomField();
			int rows = modelAccess.yField.getRows();
			if (rows > 0) {
				textArea.setRows(modelAccess.yField.getRows());
			}
			textArea.setSizeFull();
			textArea.addStyleName(CSS_CLASS_CONTROL);
			textArea.setImmediate(true);
			textArea.setNullRepresentation("");
			setupComponent(textArea, getCastedModel());

			associateWidget(textArea, modelAccess.yField);
			if (modelAccess.isCssIdValid()) {
				textArea.setId(modelAccess.getCssID());
			} else {
				textArea.setId(getEditpart().getId());
			}

			property = new ObjectProperty<String>(null, String.class);
			textArea.setPropertyDataSource(property);

			// creates the binding for the field
			createBindings(modelAccess.yField, textArea);

			if (modelAccess.isCssClassValid()) {
				textArea.addStyleName(modelAccess.getCssClass());
			}

			applyCaptions();

			initializeField(textArea);

			textArea.setRows(modelAccess.yField.getRows());
			textArea.setWordwrap(modelAccess.yField.isWordWrap());
		}
		return textArea;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractVaadinWidgetPresenter#doUpdateLocale(java.util.Locale)
	 */
	@Override
	protected void doUpdateLocale(Locale locale) {
		// no need to set the locale to the ui elements. Is handled by vaadin
		// internally.

		// update the captions
		applyCaptions();
	}

	/**
	 * Applies the labels to the widgets.
	 */
	protected void applyCaptions() {
		Util.applyCaptions(getI18nService(), modelAccess.getLabel(),
				modelAccess.getLabelI18nKey(), getLocale(), textArea);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractFieldWidgetPresenter#doGetField()
	 */
	@Override
	protected Field<?> doGetField() {
		return textArea;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.osbp.runtime.web.ecview.presentation.vaadin.common.AbstractVaadinWidgetPresenter#internalGetObservableEndpoint(org.eclipse.osbp.ecview.core.common.model.core.YEmbeddableBindingEndpoint)
	 */
	@Override
	protected IObservable internalGetObservableEndpoint(
			YEmbeddableBindingEndpoint bindableValue) {
		if (bindableValue == null) {
			throw new IllegalArgumentException(
					"BindableValue must not be null!");
		}

		if (bindableValue instanceof YEmbeddableValueEndpoint) {
			return internalGetValueEndpoint();
		}
		throw new IllegalArgumentException("Not a valid input: "
				+ bindableValue);
	}

	/**
	 * Returns the observable to observe value.
	 *
	 * @return the i observable value
	 */
	protected IObservableValue internalGetValueEndpoint() {
		// return the observable value for text
		return EMFObservables.observeValue(castEObject(getModel()),
				ExtensionModelPackage.Literals.YTEXT_AREA__VALUE);
	}

	/**
	 * Creates the bindings for the given values.
	 *
	 * @param yField
	 *            the y field
	 * @param field
	 *            the field
	 */
	protected void createBindings(final YTextArea yField, TextArea field) {
		registerBinding(createBindings_Value(castEObject(getModel()),
				ExtensionModelPackage.Literals.YTEXT_AREA__VALUE, textArea));

		field.addTextChangeListener(e -> {
			yField.setLastTextChange(e.getText());
		});
		
		super.createBindings(yField, field, null);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation#getWidget()
	 */
	@Override
	public Component getWidget() {
		return textArea;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.osbp.ecview.core.common.presentation.IWidgetPresentation#isRendered()
	 */
	@Override
	public boolean isRendered() {
		return textArea != null;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void doUnrender() {
		if (textArea != null) {

			// unbind all active bindings
			unbind();

			Component parent = ((Component) textArea.getParent());
			if (parent != null && parent instanceof ComponentContainer) {
				((ComponentContainer) parent).removeComponent(textArea);
			}

			// remove assocations
			unassociateWidget(textArea);

			textArea = null;
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void internalDispose() {
		try {
			unrender();
		} finally {
			super.internalDispose();
		}
	}

	/**
	 * A helper class.
	 */
	private static class ModelAccess {
		
		/** The y field. */
		private final YTextArea yField;

		/**
		 * Instantiates a new model access.
		 *
		 * @param yField
		 *            the y field
		 */
		public ModelAccess(YTextArea yField) {
			super();
			this.yField = yField;
		}

		/**
		 * Gets the css class.
		 *
		 * @return the css class
		 * @see org.eclipse.osbp.ecview.core.ui.core.model.core.YCssAble#getCssClass()
		 */
		public String getCssClass() {
			return yField.getCssClass();
		}

		/**
		 * Returns true, if the css class is not null and not empty.
		 *
		 * @return true, if is css class valid
		 */
		public boolean isCssClassValid() {
			return getCssClass() != null && !getCssClass().equals("");
		}

		/**
		 * Gets the css id.
		 *
		 * @return the css id
		 * @see org.eclipse.osbp.ecview.core.ui.core.model.core.YCssAble#getCssID()
		 */
		public String getCssID() {
			return yField.getCssID();
		}

		/**
		 * Returns true, if the css id is not null and not empty.
		 *
		 * @return true, if is css id valid
		 */
		public boolean isCssIdValid() {
			return getCssID() != null && !getCssID().equals("");
		}

		/**
		 * Returns the label.
		 *
		 * @return the label
		 */
		public String getLabel() {
			return yField.getDatadescription() != null ? yField
					.getDatadescription().getLabel() : null;
		}

		/**
		 * Returns the label.
		 *
		 * @return the label i18n key
		 */
		public String getLabelI18nKey() {
			return yField.getDatadescription() != null ? yField
					.getDatadescription().getLabelI18nKey() : null;
		}
	}

	/**
	 * The Class CustomField.
	 */
	@SuppressWarnings("serial")
	private class CustomField extends TextArea {

		/* (non-Javadoc)
		 * @see com.vaadin.ui.AbstractField#getErrorMessage()
		 */
		@Override
		public ErrorMessage getErrorMessage() {
			if (isDisposed()) {
				// after disposal, Vaadin will call this method once.
				return null;
			}

			ErrorMessage message = super.getErrorMessage();
			reportValidationError(message);
			return message;
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see com.vaadin.ui.AbstractField#setConvertedValue(java.lang.Object)
		 */
		@Override
		public void setConvertedValue(Object value) {
			boolean oldReadonly = isReadOnly();
			try {
				setReadOnly(false);
				super.setConvertedValue(value);
			} finally {
				setReadOnly(oldReadonly);
			}
		}
	}
}