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

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

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

import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.gui.OsmPrimitivRenderer;
import org.openstreetmap.josm.gui.PleaseWaitRunnable;
import org.openstreetmap.josm.io.OsmServerWriter;
import org.openstreetmap.josm.tools.GBC;
import org.xml.sax.SAXException;
import org.openstreetmap.josm.tools.Shortcut;

/**
 * Action that opens a connection to the osm server and uploads all changes.
 *
 * An dialog is displayed asking the user to specify a rectangle to grab.
 * The url and account settings from the preferences are used.
 *
 * @author imi
 */
public class UploadAction extends JosmAction {

    /** Upload Hook */
    public interface UploadHook {
        /**
         * Checks the upload.
         * @param add The added primitives
         * @param update The updated primitives
         * @param delete The deleted primitives
         * @return true, if the upload can continue
         */
        public boolean checkUpload(Collection<OsmPrimitive> add, Collection<OsmPrimitive> update, Collection<OsmPrimitive> delete);
    }

    /**
     * The list of upload hooks. These hooks will be called one after the other
     * when the user wants to upload data. Plugins can insert their own hooks here
     * if they want to be able to veto an upload.
     *
     * Be default, the standard upload dialog is the only element in the list.
     * Plugins should normally insert their code before that, so that the upload
     * dialog is the last thing shown before upload really starts; on occasion
     * however, a plugin might also want to insert something after that.
     */
    public final LinkedList<UploadHook> uploadHooks = new LinkedList<UploadHook>();

    public UploadAction() {
        super(tr("Upload to OSM ..."), "upload", tr("Upload all changes to the OSM server."),
        Shortcut.registerShortcut("file:upload", tr("File: {0}", tr("Upload to OSM ...")), KeyEvent.VK_U, Shortcut.GROUPS_ALT1+Shortcut.GROUP_HOTKEY), true);

        /**
         * Displays a screen where the actions that would be taken are displayed and
         * give the user the possibility to cancel the upload.
         */
        uploadHooks.add(new UploadHook() {
            public boolean checkUpload(Collection<OsmPrimitive> add, Collection<OsmPrimitive> update, Collection<OsmPrimitive> delete) {

                JPanel p = new JPanel(new GridBagLayout());

                OsmPrimitivRenderer renderer = new OsmPrimitivRenderer();

                if (!add.isEmpty()) {
                    p.add(new JLabel(tr("Objects to add:")), GBC.eol());
                    JList l = new JList(add.toArray());
                    l.setCellRenderer(renderer);
                    l.setVisibleRowCount(l.getModel().getSize() < 6 ? l.getModel().getSize() : 10);
                    p.add(new JScrollPane(l), GBC.eol().fill());
                }

                if (!update.isEmpty()) {
                    p.add(new JLabel(tr("Objects to modify:")), GBC.eol());
                    JList l = new JList(update.toArray());
                    l.setCellRenderer(renderer);
                    l.setVisibleRowCount(l.getModel().getSize() < 6 ? l.getModel().getSize() : 10);
                    p.add(new JScrollPane(l), GBC.eol().fill());
                }

                if (!delete.isEmpty()) {
                    p.add(new JLabel(tr("Objects to delete:")), GBC.eol());
                    JList l = new JList(delete.toArray());
                    l.setCellRenderer(renderer);
                    l.setVisibleRowCount(l.getModel().getSize() < 6 ? l.getModel().getSize() : 10);
                    p.add(new JScrollPane(l), GBC.eol().fill());
                }

                return JOptionPane.showConfirmDialog(Main.parent, p, tr("Upload these changes?"),
                        JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION;
            }
        });
    }

    public void actionPerformed(ActionEvent e) {
        if (Main.map == null) {
            JOptionPane.showMessageDialog(Main.parent,tr("Nothing to upload. Get some data first."));
            return;
        }

        if (!Main.map.conflictDialog.conflicts.isEmpty()) {
            JOptionPane.showMessageDialog(Main.parent,tr("There are unresolved conflicts. You have to resolve these first."));
            Main.map.conflictDialog.action.button.setSelected(true);
            Main.map.conflictDialog.action.actionPerformed(null);
            return;
        }

        final LinkedList<OsmPrimitive> add = new LinkedList<OsmPrimitive>();
        final LinkedList<OsmPrimitive> update = new LinkedList<OsmPrimitive>();
        final LinkedList<OsmPrimitive> delete = new LinkedList<OsmPrimitive>();
        for (OsmPrimitive osm : Main.ds.allPrimitives()) {
            if (osm.get("josm/ignore") != null)
                continue;
            if (osm.id == 0 && !osm.deleted)
                add.addLast(osm);
            else if (osm.modified && !osm.deleted)
                update.addLast(osm);
            else if (osm.deleted && osm.id != 0)
                delete.addFirst(osm);
        }

        if (add.isEmpty() && update.isEmpty() && delete.isEmpty()) {
            JOptionPane.showMessageDialog(Main.parent,tr("No changes to upload."));
            return;
        }

        // Call all upload hooks in sequence. The upload confirmation dialog
        // is one of these.
        for(UploadHook hook : uploadHooks)
            if(!hook.checkUpload(add, update, delete))
                return;

        final OsmServerWriter server = new OsmServerWriter();
        final Collection<OsmPrimitive> all = new LinkedList<OsmPrimitive>();
        all.addAll(add);
        all.addAll(update);
        all.addAll(delete);

        PleaseWaitRunnable uploadTask = new PleaseWaitRunnable(tr("Uploading data")){
            @Override protected void realRun() throws SAXException {
                server.uploadOsm(all);
            }
            @Override protected void finish() {
                Main.main.editLayer().cleanData(server.processed, !add.isEmpty());
            }
            @Override protected void cancel() {
                server.cancel();
            }
        };
        Main.worker.execute(uploadTask);
    }
}