/******************************************************************************
 * Copyright (c) 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    IBM Corporation - initial API and implementation 
 ****************************************************************************/

package org.eclipse.gmf.runtime.diagram.ui.printing.internal.util;

import java.text.NumberFormat;
import java.text.ParseException;
import java.util.List;
import java.util.Map;

import org.eclipse.gmf.runtime.common.core.util.Log;
import org.eclipse.gmf.runtime.common.ui.printing.IPrintHelper;
import org.eclipse.gmf.runtime.diagram.ui.internal.pagesetup.PageSetupPageType;
import org.eclipse.gmf.runtime.diagram.ui.internal.properties.WorkspaceViewerProperties;
import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer;
import org.eclipse.gmf.runtime.diagram.ui.parts.IDiagramGraphicalViewer;
import org.eclipse.gmf.runtime.diagram.ui.parts.IDiagramWorkbenchPart;
import org.eclipse.gmf.runtime.diagram.ui.printing.internal.DiagramPrintingPlugin;
import org.eclipse.gmf.runtime.diagram.ui.printing.internal.DiagramPrintingStatusCodes;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.swt.printing.PrinterData;
import org.eclipse.ui.IEditorPart;

/**
 * Utility for using the DiagramPrinter to print diagrams after displaying
 * a print dialog box to the user.  Diagrams are printed using the
 * DiagramPrinter and respect the settings chosen by the user in the print
 * dialog. 
 * 
 * Basic functionality was factored into this class from the DiagramPrinterUtil.
 * This class and its specializing classes:
 * 
 * @author James Bruck (jbruck)
 */
public class DiagramPrinterHelper {

	/**
	 * Prints a diagram with the settings from the helper onto the printer
	 * 
	 * @param diagramPrinter
	 *            the diagram printer that does the work of actually
	 *            printing the diagrams
	 * @param helper
	 *            IPrintHelper with the user's choice of settings
	 */
	protected void printDiagrams(DiagramPrinter diagramPrinter,
			IPrintHelper helper) {

		if (helper.getDlgPrintRangePages()) {
			diagramPrinter.setPrintRangePageSelection(true);
			diagramPrinter.setPrintRangePages(helper.getDlgPagesFrom(), helper
					.getDlgPagesTo());
			diagramPrinter.setFitToPage(false);
		}

		if (helper.getDlgScalePercent() == -1) {
			diagramPrinter.setColumns(helper.getDlgScaleFitToM());
			diagramPrinter.setRows(helper.getDlgScaleFitToN());
			diagramPrinter.setFitToPage(true);
		} else {
			diagramPrinter.setScaledPercent(helper.getDlgScalePercent());
			diagramPrinter.setFitToPage(false);
		}

		diagramPrinter.run();
	}

	/**
	 *   A helper that simply collects printing information.
	 *  
	 * @param diagramPrinter
	 * @param helper
	 * @param diagramNames
	 * @param editorPart
	 * @param diagramMap
	 * @return
	 */
	protected PrinterData collectPrintInformation(
			DiagramPrinter diagramPrinter, IPrintHelper helper,
			List diagramNames, IEditorPart editorPart, Map diagramMap) {

		PrinterData printerData;

		IPreferenceStore pref = null;

		if (editorPart instanceof IDiagramWorkbenchPart) {

			IDiagramGraphicalViewer viewer = ((IDiagramWorkbenchPart) editorPart)
					.getDiagramGraphicalViewer();
			if (viewer instanceof DiagramGraphicalViewer) {

				pref = ((DiagramGraphicalViewer) viewer)
						.getWorkspaceViewerPreferenceStore();

				if (pref
						.getBoolean(WorkspaceViewerProperties.PREF_USE_WORKSPACE_SETTINGS)) {

					if (((IDiagramWorkbenchPart) editorPart)
							.getDiagramEditPart().getDiagramPreferencesHint()
							.getPreferenceStore() != null) {
						pref = (IPreferenceStore) ((IDiagramWorkbenchPart) editorPart)
								.getDiagramEditPart()
								.getDiagramPreferencesHint()
								.getPreferenceStore();
					}
				}
			}
		}
		if (pref != null) {
			helper.setDlgOrientation(pref
					.getBoolean(WorkspaceViewerProperties.PREF_USE_LANDSCAPE));

			PageSetupPageType storedPageType = PageSetupPageType.LETTER; //default value
			String strPageType = pref
					.getString(WorkspaceViewerProperties.PREF_PAGE_SIZE);
			for (int i = 0; i < PageSetupPageType.pages.length; i++) {
				if (strPageType
						.startsWith(PageSetupPageType.pages[i].getName())) {
					storedPageType = PageSetupPageType.pages[i];
					break;
				}
			}
			if (storedPageType.getIndex() == PageSetupPageType.USER_DEFINED
					.getIndex()) {

				NumberFormat fNumberFormat = NumberFormat.getNumberInstance();

				String strWidth = pref
						.getString(WorkspaceViewerProperties.PREF_PAGE_WIDTH);
				String strHeight = pref
						.getString(WorkspaceViewerProperties.PREF_PAGE_HEIGHT);
				double width = 0, height = 0;

				try {
					Number num = fNumberFormat.parse(strWidth);
					width = num.doubleValue() / 0.0394d; //convert from inches to mm

					num = fNumberFormat.parse(strHeight);
					height = num.doubleValue() / 0.0394d;

					helper.setDlgPaperSize(PageSetupPageType.USER_DEFINED
							.getIndex(), width, height);
				} catch (ParseException e) {
					Log
							.warning(
									DiagramPrintingPlugin.getInstance(),
									DiagramPrintingStatusCodes.IGNORED_EXCEPTION_WARNING,
									e.getMessage(), e);
				}
			} else {
				helper.setDlgPaperSize(storedPageType.getIndex(), 0, 0);
			}
		}		
		helper.setScaleFactor(PrintHelperUtil.getScale());
		helper.setScaleToWidthHeight(PrintHelperUtil.getScaleToWidth(), PrintHelperUtil.getScaleToHeight());

		printerData = helper.openPrintDlg(diagramNames);

		if (printerData != null) {
			if (helper.getDlgScalePercent() != -1) {
				PrintHelperUtil.setScale(helper.getDlgScalePercent());
			}					
			if (helper.getDlgScaleFitToM() != -1) {
				PrintHelperUtil.setScaleToWidth(helper.getDlgScaleFitToM());
			}
			if (helper.getDlgScaleFitToN() != -1) {
				PrintHelperUtil.setScaleToHeight(helper.getDlgScaleFitToN());
			}
		}
		
		return printerData;
	}

}