/*******************************************************************************
 * Copyright (c) 2011-2013 EclipseSource Muenchen GmbH and others.
 *
 * 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:
 * Edagr Mueller - initial API and implementation
 * Eugen Neufeld - Refactoring
 ******************************************************************************/
package org.eclipse.emf.ecp.view.spi.horizontal.swt;

import java.util.LinkedHashMap;
import java.util.Map;

import javax.inject.Inject;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
import org.eclipse.emf.ecp.view.spi.horizontal.model.VHorizontalLayout;
import org.eclipse.emf.ecp.view.spi.model.VContainedElement;
import org.eclipse.emf.ecp.view.spi.model.VElement;
import org.eclipse.emf.ecp.view.spi.model.reporting.StatusReport;
import org.eclipse.emf.ecp.view.spi.renderer.NoPropertyDescriptorFoundExeption;
import org.eclipse.emf.ecp.view.spi.renderer.NoRendererFoundException;
import org.eclipse.emf.ecp.view.spi.swt.layout.LayoutProviderHelper;
import org.eclipse.emf.ecp.view.spi.swt.reporting.RenderingFailedReport;
import org.eclipse.emfforms.spi.common.report.ReportService;
import org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer;
import org.eclipse.emfforms.spi.swt.core.EMFFormsNoRendererException;
import org.eclipse.emfforms.spi.swt.core.EMFFormsRendererFactory;
import org.eclipse.emfforms.spi.swt.core.layout.GridDescriptionFactory;
import org.eclipse.emfforms.spi.swt.core.layout.SWTGridCell;
import org.eclipse.emfforms.spi.swt.core.layout.SWTGridDescription;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

/**
 * The SWT Renderer for the {@link VHorizontalLayout}. It renders all elements next to each other.
 *
 * @author Eugen Neufeld
 * @since 1.2
 *
 */
public class HorizontalLayoutSWTRenderer extends AbstractSWTRenderer<VHorizontalLayout> {

	private final EMFFormsRendererFactory rendererFactory;

	/**
	 * Default Constructor.
	 *
	 * @param vElement the view element to be rendered
	 * @param viewContext The view model context
	 * @param reportService the ReportService to use
	 * @param rendererFactory the EMFFormsRendererFactory to use
	 * @since 1.6
	 */
	@Inject
	public HorizontalLayoutSWTRenderer(final VHorizontalLayout vElement, final ViewModelContext viewContext,
		ReportService reportService, EMFFormsRendererFactory rendererFactory) {
		super(vElement, viewContext, reportService);
		this.rendererFactory = rendererFactory;
	}

	private static final String CONTROL_COLUMN_COMPOSITE = "org_eclipse_emf_ecp_ui_layout_horizontal"; //$NON-NLS-1$
	private SWTGridDescription rendererGridDescription;

	/**
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer#dispose()
	 */
	@Override
	protected void dispose() {
		rendererGridDescription = null;
		super.dispose();
	}

	/**
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer#getGridDescription(SWTGridDescription)
	 */
	@Override
	public SWTGridDescription getGridDescription(SWTGridDescription gridDescription) {
		if (rendererGridDescription == null) {
			rendererGridDescription = GridDescriptionFactory.INSTANCE.createSimpleGrid(1, 1, this);
			rendererGridDescription.getGrid().get(0).setVerticalGrab(false);
		}
		return rendererGridDescription;
	}

	/**
	 * {@inheritDoc}
	 *
	 * @see org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer#renderControl(int, org.eclipse.swt.widgets.Composite,
	 *      org.eclipse.emf.ecp.view.spi.model.VElement, org.eclipse.emf.ecp.view.spi.context.ViewModelContext)
	 */
	@Override
	protected Control renderControl(SWTGridCell gridCell, Composite parent) throws NoRendererFoundException,
		NoPropertyDescriptorFoundExeption {
		if (gridCell.getColumn() != 0) {
			return null;
		}
		final Composite columnComposite = new Composite(parent, SWT.NONE);
		columnComposite.setBackground(parent.getBackground());
		columnComposite.setData(CUSTOM_VARIANT, CONTROL_COLUMN_COMPOSITE);

		final Map<VContainedElement, AbstractSWTRenderer<VElement>> elementRendererMap = new LinkedHashMap<VContainedElement, AbstractSWTRenderer<VElement>>();
		for (final VContainedElement child : getVElement().getChildren()) {

			AbstractSWTRenderer<VElement> renderer;
			try {
				renderer = rendererFactory.getRendererInstance(child,
					getViewModelContext());
			} catch (final EMFFormsNoRendererException ex) {
				getReportService().report(new StatusReport(
					new Status(IStatus.INFO, "org.eclipse.emf.ecp.view.horizontal.ui.swt", //$NON-NLS-1$
						String.format("No Renderer for %s found.", child.eClass().getName())))); //$NON-NLS-1$
				continue;
			}
			elementRendererMap.put(child, renderer);
		}
		// Gridlayout does not have an overflow as other Layouts might have.

		columnComposite.setLayout(LayoutProviderHelper.getColumnLayout(elementRendererMap.size(), true));
		for (final VContainedElement child : elementRendererMap.keySet()) {
			final AbstractSWTRenderer<VElement> renderer = elementRendererMap.get(child);
			final Composite column = new Composite(columnComposite, SWT.NONE);
			column.setBackground(parent.getBackground());

			column.setLayoutData(LayoutProviderHelper.getSpanningLayoutData(1, 1));

			final SWTGridDescription gridDescription = renderer.getGridDescription(GridDescriptionFactory.INSTANCE
				.createEmptyGridDescription());
			column.setLayout(LayoutProviderHelper.getColumnLayout(gridDescription.getColumns(), false));

			try {
				for (final SWTGridCell childGridCell : gridDescription.getGrid()) {
					final Control control = childGridCell.getRenderer().render(childGridCell, column);
					if (control == null) {
						continue;
					}
					// TODO who should apply the layout
					control.setLayoutData(LayoutProviderHelper.getLayoutData(childGridCell, gridDescription,
						gridDescription, gridDescription, childGridCell.getRenderer().getVElement(),
						getViewModelContext().getDomainModel(), control));
				}
				for (final SWTGridCell childGridCell : gridDescription.getGrid()) {
					childGridCell.getRenderer().finalizeRendering(column);
				}
			} catch (final NoPropertyDescriptorFoundExeption e) {
				getReportService().report(new RenderingFailedReport(e));
				continue;
			}
		}

		return columnComposite;
	}

}