// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.io;

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

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.actions.ExtensionFileFilter;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
import org.openstreetmap.josm.gui.progress.ProgressMonitor;

public class OsmChangeImporter extends FileImporter {

    public static final ExtensionFileFilter FILE_FILTER = new ExtensionFileFilter(
            "osc,osc.bz2,osc.bz,osc.gz", "osc", tr("OsmChange File") + " (*.osc *.osc.bz2 *.osc.bz *.osc.gz)");
    
    public OsmChangeImporter() {
        super(FILE_FILTER);
    }

    public OsmChangeImporter(ExtensionFileFilter filter) {
        super(filter);
    }

    @Override public void importData(File file, ProgressMonitor progressMonitor) throws IOException, IllegalDataException {
        try {
            FileInputStream in = new FileInputStream(file);
            
            if (file.getName().endsWith(".osc")) {
                importData(in, file);
            } else if (file.getName().endsWith(".gz")) {
                importData(getGZipInputStream(in), file);
            } else {
                importData(getBZip2InputStream(in), file);
            }
            
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            throw new IOException(tr("File ''{0}'' does not exist.", file.getName()));
        }
    }

    protected void importData(InputStream in, final File associatedFile) throws IllegalDataException {
        final DataSet dataSet = OsmChangeReader.parseDataSet(in, NullProgressMonitor.INSTANCE);
        final OsmDataLayer layer = new OsmDataLayer(dataSet, associatedFile.getName(), associatedFile);
        addDataLayer(dataSet, layer, associatedFile.getPath()); 
    }
        
    protected void addDataLayer(final DataSet dataSet, final OsmDataLayer layer, final String filePath) { 
        // FIXME: remove UI stuff from IO subsystem
        //
        Runnable uiStuff = new Runnable() {
            @Override
            public void run() {
                if (dataSet.allPrimitives().isEmpty()) {
                    JOptionPane.showMessageDialog(
                            Main.parent,
                            tr("No data found in file {0}.", filePath),
                            tr("Open OsmChange file"),
                            JOptionPane.INFORMATION_MESSAGE);
                }
                Main.main.addLayer(layer);
                layer.onPostLoadFromFile();
            }
        };
        if (SwingUtilities.isEventDispatchThread()) {
            uiStuff.run();
        } else {
            SwingUtilities.invokeLater(uiStuff);
        }
    }
}