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

import java.awt.event.ActionEvent;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.Collection;
import java.util.HashSet;

import javax.swing.AbstractAction;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.Bounds;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.Way;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.CollectBackReferencesVisitor;
import org.openstreetmap.josm.gui.MapFrame;
import org.openstreetmap.josm.gui.preferences.PreferenceDialog;
import org.openstreetmap.josm.gui.preferences.PreferenceSetting;
import org.openstreetmap.josm.io.OsmWriter;
import org.openstreetmap.josm.plugins.Plugin;
import org.openstreetmap.josm.tools.GBC;

public class OsmarenderPlugin extends Plugin {

	private class Action extends AbstractAction {

		public Action() {
			super("Osmarender");
		}

		public void actionPerformed(ActionEvent e) {
			// get all stuff visible on screen
			LatLon bottomLeft = Main.map.mapView.getLatLon(0,Main.map.mapView.getHeight());
			LatLon topRight = Main.map.mapView.getLatLon(Main.map.mapView.getWidth(), 0);
			Bounds b = new Bounds(bottomLeft, topRight);

			try {
				writeGenerated(b);
			} catch(Exception ex) {
				//how handle the exception?
			}

			CollectBackReferencesVisitor backRefsV = new CollectBackReferencesVisitor(Main.ds, true);
			DataSet fromDataSet = new DataSet();
			for (Node n : Main.ds.nodes) {
				if (n.deleted || n.incomplete) continue;
				if (n.coor.isWithin(b)) {
					fromDataSet.nodes.add(n);
					n.visit(backRefsV);
				}
			}
			for (OsmPrimitive p : new HashSet<OsmPrimitive>(backRefsV.data)) {
				if (p instanceof Way) {
					backRefsV.data.addAll(((Way) p).nodes);
				}
			}
			for (OsmPrimitive p : backRefsV.data)
				fromDataSet.addPrimitive(p);

			String firefox = Main.pref.get("osmarender.firefox", "firefox");
			try {
				// write to plugin dir
				OsmWriter.output(new FileOutputStream(getPluginDir()+"data.osm"), new OsmWriter.All(fromDataSet, true));

				// get the exec line
				String exec = firefox;
				if (System.getProperty("os.name").startsWith("Windows"))
					exec += " file:///"+getPluginDir().replace('\\','/').replace(" ","%20")+"generated.xml\"";
				else
					exec += " "+getPluginDir()+"generated.xml";

				// launch up the viewer
				Runtime.getRuntime().exec(exec);
			} catch (IOException e1) {
				JOptionPane.showMessageDialog(Main.parent, tr("Firefox not found. Please set firefox executable in the Map Settings page of the preferences."));
			}
		}
	}

	private JMenu view;
	private JMenuItem osmarenderMenu = new JMenuItem(new Action());

	public OsmarenderPlugin() throws IOException {
		JMenuBar menu = Main.main.menu;
		view = null;
		for (int i = 0; i < menu.getMenuCount(); ++i) {
			if (menu.getMenu(i) != null && tr("View").equals(menu.getMenu(i).getText())) {
				view = menu.getMenu(i);
				break;
			}
		}
		if (view == null) {
			view = new JMenu(tr("View"));
			menu.add(view, 2);
			view.setVisible(false);
		}
		view.add(osmarenderMenu);
		osmarenderMenu.setVisible(false);

		// install the xsl and xml file
		copy("/osmarender.xsl", "osmarender.xsl");
		copy("/osm-map-features.xml", "osm-map-features.xml");
	}

	@Override
	public void mapFrameInitialized(MapFrame oldFrame, MapFrame newFrame) {
		if (oldFrame != null && newFrame == null) {
			// disable
			osmarenderMenu.setVisible(false);
			if (view.getMenuComponentCount() == 1)
				view.setVisible(false);
		} else if (oldFrame == null && newFrame != null) {
			// enable
			osmarenderMenu.setVisible(true);
			if (view.getMenuComponentCount() == 1)
				view.setVisible(true);
		}
	}

	@Override public PreferenceSetting getPreferenceSetting() {
		return new PreferenceSetting(){
			private JTextField firefox = new JTextField(10);
			public void addGui(PreferenceDialog gui) {
				gui.map.add(new JLabel(tr("osmarender options")), GBC.eol().insets(0,5,0,0));
				gui.map.add(new JLabel(tr("Firefox executable")), GBC.std().insets(10,5,5,0));
				gui.map.add(firefox, GBC.eol().insets(0,5,0,0).fill(GBC.HORIZONTAL));
				firefox.setText(Main.pref.get("osmarender.firefox"));
			}
			public boolean ok() {
				Main.pref.put("osmarender.firefox", firefox.getText());
				return false;
			}
		};
	}

	private void writeGenerated(Bounds b) throws IOException {
		String bounds_tag = "<bounds " +
			"minlat=\"" + b.min.lat() + "\" " +
			"maxlat=\"" + b.max.lat() + "\" " +
			"minlon=\"" + b.min.lon() + "\" " +
			"maxlon=\"" + b.max.lon() + "\" " + "/>";

		BufferedReader reader = new BufferedReader(
				new FileReader( getPluginDir() + "osm-map-features.xml") );
		PrintWriter writer = new PrintWriter( getPluginDir() + "generated.xml");

		// osm-map-fetaures.xml contain two placemark
		// (bounds_mkr1 and bounds_mkr2). We write the bounds tag
		// between the two
		String str = null;
		while( (str = reader.readLine()) != null ) {
			if(str.contains("<!--bounds_mkr1-->")) {
				writer.println(str);
				writer.println("    " + bounds_tag);
				while(!str.contains("<!--bounds_mkr2-->")) {
					str = reader.readLine();
				}
				writer.println(str);
			} else {
				writer.println(str);
			}
		}

		writer.close();
	}
}