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

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

import java.awt.GraphicsEnvironment;
import java.awt.event.ActionEvent;
import java.io.File;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.stream.Collectors;

import javax.swing.AbstractAction;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileFilter;

import org.openstreetmap.josm.actions.DiskAccessAction;
import org.openstreetmap.josm.data.Preferences;
import org.openstreetmap.josm.gui.MainApplication;
import org.openstreetmap.josm.gui.io.CustomConfigurator;
import org.openstreetmap.josm.gui.widgets.AbstractFileChooser;
import org.openstreetmap.josm.spi.preferences.Setting;
import org.openstreetmap.josm.tools.Utils;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * Action that exports some fragment of settings to custom configuration file
 */
public class ExportProfileAction extends AbstractAction {
    private final String prefPattern;
    private final String schemaKey;
    private final transient Preferences prefs;

    /**
     * Constructs a new {@code ExportProfileAction}.
     * @param prefs preferences
     * @param schemaKey filename prefix
     * @param prefPattern preference key pattern used to determine which entries are exported
     */
    public ExportProfileAction(Preferences prefs, String schemaKey, String prefPattern) {
        super(tr("Save {0} profile", tr(schemaKey)));
        new ImageProvider("save").getResource().attachImageIcon(this, true);
        this.prefs = prefs;
        this.prefPattern = prefPattern;
        this.schemaKey = schemaKey;
    }

    @Override
    public void actionPerformed(ActionEvent ae) {
        Map<String, Setting<?>> all = prefs.getAllSettings();
        List<String> keys = all.keySet().stream()
                .filter(key -> key.matches(prefPattern))
                .collect(Collectors.toList());
        if (keys.isEmpty()) {
            JOptionPane.showMessageDialog(MainApplication.getMainFrame(),
                    tr("All the preferences of this group are default, nothing to save"), tr("Warning"), JOptionPane.WARNING_MESSAGE);
            return;
        }
        File f = askUserForCustomSettingsFile();
        if (f != null)
           CustomConfigurator.exportPreferencesKeysToFile(f.getAbsolutePath(), false, keys);
    }

    private File askUserForCustomSettingsFile() {
        String title = tr("Choose profile file");

        FileFilter filter = new FileFilter() {
            @Override
            public boolean accept(File f) {
                return f.isDirectory() || (Utils.hasExtension(f, "xml") && f.getName().toLowerCase(Locale.ENGLISH).startsWith(schemaKey));
            }

            @Override
            public String getDescription() {
                return tr("JOSM custom settings files (*.xml)");
            }
        };
        if (!GraphicsEnvironment.isHeadless()) {
            AbstractFileChooser fc = DiskAccessAction.createAndOpenFileChooser(false, false, title, filter,
                    JFileChooser.FILES_ONLY, "customsettings.lastDirectory");
            if (fc != null) {
                File sel = fc.getSelectedFile();
                if (!sel.getName().endsWith(".xml"))
                    sel = new File(sel.getAbsolutePath()+".xml");
                if (!sel.getName().startsWith(schemaKey)) {
                    sel = new File(sel.getParentFile().getAbsolutePath()+'/'+schemaKey+'_'+sel.getName());
                }
                return sel;
            }
        }
        return null;
    }
}