package org.dbflute.erflute.editor.view.action.dbexport;

import java.util.HashMap;
import java.util.Map;

import org.dbflute.erflute.Activator;
import org.dbflute.erflute.core.DisplayMessages;
import org.dbflute.erflute.core.ImageKey;
import org.dbflute.erflute.editor.MainDiagramEditor;
import org.dbflute.erflute.editor.controller.editpart.element.node.DiagramWalkerEditPart;
import org.dbflute.erflute.editor.model.ERDiagram;
import org.dbflute.erflute.editor.model.dbexport.image.ExportToImageWithProgressManager;
import org.dbflute.erflute.editor.model.diagram_contents.element.connection.Bendpoint;
import org.dbflute.erflute.editor.model.diagram_contents.element.connection.WalkerConnection;
import org.dbflute.erflute.editor.model.diagram_contents.element.node.DiagramWalker;
import org.dbflute.erflute.editor.model.diagram_contents.element.node.category.Category;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.SWTGraphics;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.GraphicalViewer;
import org.eclipse.gef.LayerConstants;
import org.eclipse.gef.editparts.LayerManager;
import org.eclipse.gef.editparts.ScalableFreeformRootEditPart;
import org.eclipse.gef.editparts.SimpleRootEditPart;
import org.eclipse.jface.dialogs.ProgressMonitorDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.PlatformUI;

/**
 * @author modified by jflute (originated in ermaster)
 */
public class ExportToImageAction extends AbstractExportAction {

    public static final String ID = ExportToImageAction.class.getName();

    public ExportToImageAction(MainDiagramEditor editor) {
        super(ID, DisplayMessages.getMessage("action.title.export.image"), editor);
        setImageDescriptor(Activator.getImageDescriptor(ImageKey.EXPORT_TO_IMAGE));
    }

    @Override
    public void execute(Event event) throws Exception {
        save(getEditorPart(), getGraphicalViewer());
    }

    @Override
    protected void save(IEditorPart editorPart, GraphicalViewer viewer, String saveFilePath) {
        final ProgressMonitorDialog monitor = new ProgressMonitorDialog(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell());
        try {
            if (outputImage(monitor, viewer, saveFilePath) != -1) {
                Activator.showMessageDialog("dialog.message.export.finish");
            }
        } catch (final InterruptedException e) {}
    }

    @Override
    protected boolean isUseVirtualDiagramSuffix() {
        return true;
    }

    @Override
    protected String getDefaultExtension() {
        return ".png";
    }

    public static int outputImage(ProgressMonitorDialog monitor, GraphicalViewer viewer, String saveFilePath) throws InterruptedException {
        final int format = getFormatType(saveFilePath);
        if (format == -1) {
            Activator.showMessageDialog("dialog.message.export.image.not.supported");
            return -1;
        }
        Image img = null;
        try {
            img = createImage(viewer);
            final ExportToImageWithProgressManager exportToImageManager = new ExportToImageWithProgressManager(img, format, saveFilePath);
            monitor.run(true, true, exportToImageManager);
            final Exception exception = exportToImageManager.getException();
            if (exception != null) {
                throw exception;
            }
        } catch (final InterruptedException e) {
            throw e;
        } catch (final Exception e) {
            if (e.getCause() instanceof OutOfMemoryError) {
                Activator.showMessageDialog("dialog.message.export.image.out.of.memory");
            } else {
                Activator.showExceptionDialog(e);
            }
            return -1;
        } finally {
            if (img != null) {
                img.dispose();
            }
        }
        return format;
    }

    public static int getFormatType(String saveFilePath) {
        int format = -1;
        final int index = saveFilePath.lastIndexOf(".");
        String ext = null;
        if (index != -1 && index != saveFilePath.length() - 1) {
            ext = saveFilePath.substring(index + 1, saveFilePath.length());
        } else {
            ext = "";
        }
        if (ext.equalsIgnoreCase("jpeg") || ext.equalsIgnoreCase("jpg")) {
            format = SWT.IMAGE_JPEG;
        } else if (ext.equalsIgnoreCase("bmp")) {
            format = SWT.IMAGE_BMP;
        } else if (ext.equalsIgnoreCase("png")) {
            format = SWT.IMAGE_PNG;
        }
        return format;
    }

    public static Image createImage(GraphicalViewer viewer) {
        Image img = null;
        GC figureCanvasGC = null;
        GC imageGC = null;
        try {
            final ScalableFreeformRootEditPart rootEditPart =
                    (ScalableFreeformRootEditPart) viewer.getEditPartRegistry().get(LayerManager.ID);
            rootEditPart.refresh();
            final IFigure rootFigure = ((LayerManager) rootEditPart).getLayer(LayerConstants.PRINTABLE_LAYERS);

            final Object diagram = extractDiagram(viewer);
            final Rectangle rootFigureBounds = getBounds(diagram, rootEditPart, rootFigure.getBounds());

            final Control figureCanvas = viewer.getControl();
            figureCanvasGC = new GC(figureCanvas);

            img = new Image(Display.getCurrent(), rootFigureBounds.width + 20, rootFigureBounds.height + 20);
            imageGC = new GC(img);

            imageGC.setBackground(figureCanvasGC.getBackground());
            imageGC.setForeground(figureCanvasGC.getForeground());
            imageGC.setFont(figureCanvasGC.getFont());
            imageGC.setLineStyle(figureCanvasGC.getLineStyle());
            imageGC.setLineWidth(figureCanvasGC.getLineWidth());
            imageGC.setAntialias(SWT.OFF);
            // imageGC.setInterpolation(SWT.HIGH);

            final Graphics imgGraphics = new SWTGraphics(imageGC);
            imgGraphics.setBackgroundColor(figureCanvas.getBackground());
            imgGraphics.fillRectangle(0, 0, rootFigureBounds.width + 20, rootFigureBounds.height + 20);

            imgGraphics.translate(translateX(rootFigureBounds.x), translateY(rootFigureBounds.y));

            rootFigure.paint(imgGraphics);

            return img;

        } finally {
            if (figureCanvasGC != null) {
                figureCanvasGC.dispose();
            }
            if (imageGC != null) {
                imageGC.dispose();
            }
        }
    }

    public static int translateX(int x) {
        return -x + 10;
    }

    public static int translateY(int y) {
        return -y + 10;
    }

    @Override
    protected String[] getFilterExtensions() {
        return new String[] { "*.png", "*.jpeg", "*.bmp" };
    }

    public static Rectangle getBounds(Object diagram, SimpleRootEditPart rootEditPart, Rectangle rootFigureBounds) {
        Category category;
        if (diagram instanceof ERDiagram) {
            category = ((ERDiagram) diagram).getCurrentCategory();
        } else { // e.g. virtual diagram
            category = null; // #thinking all right?
        }
        if (category == null) {
            return rootFigureBounds;
        } else { // basically ERDiagram
            final Rectangle rectangle = new Rectangle();
            int minX = rootFigureBounds.x + rootFigureBounds.width;
            int minY = rootFigureBounds.y + rootFigureBounds.height;
            int maxX = rootFigureBounds.x;
            int maxY = rootFigureBounds.y;
            final Map<DiagramWalker, IFigure> visibleElements = new HashMap<>();
            for (final Object child : rootEditPart.getContents().getChildren()) {
                final DiagramWalkerEditPart editPart = (DiagramWalkerEditPart) child;
                final DiagramWalker nodeElement = (DiagramWalker) editPart.getModel();

                if (category.isVisible(nodeElement, (ERDiagram) diagram)) {
                    final IFigure figure = editPart.getFigure();
                    final Rectangle figureRectangle = figure.getBounds();

                    visibleElements.put(nodeElement, figure);

                    if (figureRectangle.x < minX) {
                        minX = figureRectangle.x;
                    }
                    if (figureRectangle.x + figureRectangle.width > maxX) {
                        maxX = figureRectangle.x + figureRectangle.width;
                    }

                    if (figureRectangle.y < minY) {
                        minY = figureRectangle.y;
                    }
                    if (figureRectangle.y + figureRectangle.height > maxY) {
                        maxY = figureRectangle.y + figureRectangle.height;
                    }
                }
            }

            for (final DiagramWalker sourceElement : visibleElements.keySet()) {
                for (final WalkerConnection connection : sourceElement.getOutgoings()) {
                    if (visibleElements.containsKey(connection.getTargetWalker())) {
                        for (final Bendpoint bendpoint : connection.getBendpoints()) {
                            int x = bendpoint.getX();
                            int y = bendpoint.getY();

                            if (bendpoint.isRelative()) {
                                final IFigure figure = visibleElements.get(sourceElement);
                                final Rectangle figureRectangle = figure.getBounds();
                                x = figureRectangle.x + figureRectangle.width * 2;
                                y = figureRectangle.y + figureRectangle.height * 2;
                            }

                            if (x < minX) {
                                minX = x;
                            } else if (x > maxX) {
                                maxX = x;
                            }

                            if (y < minY) {
                                minY = y;
                            } else if (y > maxY) {
                                maxY = y;
                            }
                        }
                    }
                }
            }

            rectangle.x = minX;
            rectangle.y = minY;
            rectangle.width = maxX - minX;
            rectangle.height = maxY - minY;
            if (rectangle.width < 0) {
                rectangle.x = 0;
                rectangle.width = 0;
            }
            if (rectangle.height < 0) {
                rectangle.y = 0;
                rectangle.height = 0;
            }

            return rectangle;
        }
    }
}