// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.actions;

import static org.openstreetmap.josm.tools.I18n.marktr;
import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.Collection;

import javax.swing.JOptionPane;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
import org.openstreetmap.josm.gui.layer.Layer;
import org.openstreetmap.josm.tools.Shortcut;

/**
 * Toggles the autoScale feature of the mapView
 * @author imi
 */
public class AutoScaleAction extends JosmAction {

    public static final String[] modes = { marktr("data"), marktr("layer"), marktr("selection"), marktr("conflict") };
    private final String mode;

    private static int getModeShortcut(String mode) {
        int shortcut = -1;

        if (mode.equals("data")) {
            shortcut = KeyEvent.VK_1;
        }
        if (mode.equals("layer")) {
            shortcut = KeyEvent.VK_2;
        }
        if (mode.equals("selection")) {
            shortcut = KeyEvent.VK_3;
        }
        if (mode.equals("conflict")) {
            shortcut = KeyEvent.VK_4;
        }

        return shortcut;
    }

    public AutoScaleAction(String mode) {
        super(tr("Zoom to {0}", tr(mode)), "dialogs/autoscale/" + mode, tr("Zoom the view to {0}.", tr(mode)),
                Shortcut.registerShortcut("view:zoom"+mode, tr("View: {0}", tr("Zoom to {0}", tr(mode))), getModeShortcut(mode), Shortcut.GROUP_EDIT), true);
        String modeHelp = Character.toUpperCase(mode.charAt(0)) + mode.substring(1);
        putValue("help", "Action/AutoScale/" + modeHelp);
        this.mode = mode;
    }

    public void actionPerformed(ActionEvent e) {
        if (Main.map != null) {
            BoundingXYVisitor bbox = getBoundingBox();
            if (bbox != null) {
                Main.map.mapView.recalculateCenterScale(bbox);
            }
        }
        putValue("active", true);
    }

    private BoundingXYVisitor getBoundingBox() {
        BoundingXYVisitor v = new BoundingXYVisitor();
        if (mode.equals("data")) {
            for (Layer l : Main.map.mapView.getAllLayers())
                l.visitBoundingBox(v);
        } else if (mode.equals("layer"))
            Main.map.mapView.getActiveLayer().visitBoundingBox(v);
        else if (mode.equals("selection") || mode.equals("conflict")) {
            Collection<OsmPrimitive> sel = mode.equals("selection") ? Main.ds.getSelected()
                    : Main.map.conflictDialog.conflicts.keySet();
            if (sel.isEmpty()) {
                JOptionPane.showMessageDialog(Main.parent,
                        mode.equals("selection") ? tr("Nothing selected to zoom to.") : tr("No conflicts to zoom to"));
                return null;
            }
            for (OsmPrimitive osm : sel)
                osm.visit(v);
            // increase bbox by 0.001 degrees on each side. this is required
            // especially if the bbox contains one single node, but helpful
            // in most other cases as well.
            v.enlargeBoundingBox();
        }
        return v;
    }
}