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

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

import java.awt.GridBagLayout;
import java.util.Arrays;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;

import org.openstreetmap.josm.data.preferences.BooleanProperty;
import org.openstreetmap.josm.data.preferences.CollectionProperty;
import org.openstreetmap.josm.data.preferences.StringProperty;
import org.openstreetmap.josm.gui.preferences.PreferenceSetting;
import org.openstreetmap.josm.gui.preferences.PreferenceSettingFactory;
import org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane;
import org.openstreetmap.josm.gui.preferences.SubPreferenceSetting;
import org.openstreetmap.josm.gui.preferences.TabPreferenceSetting;
import org.openstreetmap.josm.gui.widgets.HistoryComboBox;
import org.openstreetmap.josm.tools.GBC;

/**
 * Preferences related to Overpass API servers.
 *
 * @since 9142
 */
public class OverpassServerPreference implements SubPreferenceSetting {

    private static final StringProperty OVERPASS_SERVER = new StringProperty("download.overpass.server",
            "https://overpass-api.de/api/");
    private static final CollectionProperty OVERPASS_SERVER_HISTORY = new CollectionProperty("download.overpass.servers",
            Arrays.asList("https://overpass-api.de/api/", "http://overpass.osm.rambler.ru/cgi/"));
    private static final BooleanProperty FOR_MULTI_FETCH = new BooleanProperty("download.overpass.for-multi-fetch", false);

    private final HistoryComboBox overpassServer = new HistoryComboBox();
    private final JCheckBox forMultiFetch = new JCheckBox(tr("Use Overpass server for object downloads"));

    /**
     * Factory used to create a new {@link OverpassServerPreference}.
     */
    public static class Factory implements PreferenceSettingFactory {
        @Override
        public PreferenceSetting createPreferenceSetting() {
            return new OverpassServerPreference();
        }
    }

    @Override
    public TabPreferenceSetting getTabPreferenceSetting(PreferenceTabbedPane gui) {
        return gui.getServerPreference();
    }

    @Override
    public void addGui(PreferenceTabbedPane gui) {
        final JPanel panel = new JPanel(new GridBagLayout());

        panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        panel.add(new JLabel(tr("Overpass server: ")), GBC.std().insets(5, 5, 5, 5));
        panel.add(overpassServer, GBC.eop().fill(GBC.HORIZONTAL));
        overpassServer.setPossibleItems(OVERPASS_SERVER_HISTORY.get());
        overpassServer.setText(OVERPASS_SERVER.get());

        panel.add(forMultiFetch, GBC.eop());
        forMultiFetch.setSelected(useForMultiFetch());

        panel.add(Box.createVerticalGlue(), GBC.eol().fill());

        getTabPreferenceSetting(gui).addSubTab(this, tr("Overpass server"), panel);
    }

    @Override
    public boolean ok() {
        OVERPASS_SERVER.put(overpassServer.getText());
        OVERPASS_SERVER_HISTORY.put(overpassServer.getHistory());
        FOR_MULTI_FETCH.put(forMultiFetch.isSelected());
        return false;
    }

    @Override
    public boolean isExpert() {
        return true;
    }

    /**
     * Returns the URL of the currently selected Overpass server.
     * @return the URL of the currently selected Overpass server.
     */
    public static String getOverpassServer() {
        return OVERPASS_SERVER.get();
    }

    /**
     * Returns true if objects should be fetched from an Overpass server instead of the OSM API.
     * @return true if objects should be fetched from an Overpass server instead of the OSM API.
     */
    public static boolean useForMultiFetch() {
        return FOR_MULTI_FETCH.get();
    }
}