// 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.Dimension;
import java.awt.GridBagLayout;
import java.util.ArrayList;
import java.util.List;

import javax.swing.DefaultCellEditor;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;

import org.openstreetmap.josm.data.Preferences.ListSetting;
import org.openstreetmap.josm.gui.ExtendedDialog;
import org.openstreetmap.josm.gui.widgets.JosmTextField;
import org.openstreetmap.josm.tools.GBC;
import org.openstreetmap.josm.tools.Predicate;
import org.openstreetmap.josm.tools.Utils;
import org.openstreetmap.josm.tools.WindowGeometry;

/**
 * Editor for List preference entries.
 */
public class ListEditor extends ExtendedDialog {

    private List<String> data;
    private transient PrefEntry entry;

    /**
     * Constructs a new {@code ListEditor}.
     * @param gui The parent component
     */
    public ListEditor(final JComponent gui, PrefEntry entry, ListSetting setting) {
        super(gui, tr("Change list setting"), new String[] {tr("OK"), tr("Cancel")});
        this.entry = entry;
        List<String> orig = setting.getValue();
        if (orig != null) {
            data = new ArrayList<>(orig);
        } else {
            data = new ArrayList<>();
        }
        setButtonIcons(new String[] {"ok.png", "cancel.png"});
        setRememberWindowGeometry(getClass().getName() + ".geometry", WindowGeometry.centerInWindow(gui, new Dimension(300, 350)));
        setContent(build(), false);
    }

    /**
     * Returns the list of values.
     * @return The list of values.
     */
    public List<String> getData() {
        return new ArrayList<>(Utils.filter(data, new Predicate<String>() {
            @Override
            public boolean evaluate(String object) {
                return object != null && !object.isEmpty();
            }
        }));
    }

    protected final JPanel build() {
        JPanel p = new JPanel(new GridBagLayout());
        p.add(new JLabel(tr("Key: {0}", entry.getKey())), GBC.eol().insets(0, 0, 5, 0));
        ListSettingTableModel listModel = new ListSettingTableModel();
        JTable table = new JTable(listModel);
        table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
        table.setTableHeader(null);

        DefaultCellEditor editor = new DefaultCellEditor(new JosmTextField());
        editor.setClickCountToStart(1);
        table.setDefaultEditor(table.getColumnClass(0), editor);

        JScrollPane pane = new JScrollPane(table);
        p.add(pane, GBC.eol().insets(5, 10, 0, 0).fill());
        return p;
    }

    class ListSettingTableModel extends AbstractTableModel {

        public List<String> getData() {
            return data;
        }

        @Override
        public int getRowCount() {
            return data.size() + 1;
        }

        @Override
        public int getColumnCount() {
            return 1;
        }

        @Override
        public Object getValueAt(int row, int column) {
            return data.size() == row ? "" : data.get(row);
        }

        @Override
        public void setValueAt(Object o, int row, int column) {
            String s = (String) o;
            if (row == data.size()) {
                data.add(s);
                fireTableRowsInserted(row+1, row+1);
            } else {
                data.set(row, s);
            }
            fireTableCellUpdated(row, column);
        }

        @Override
        public boolean isCellEditable(int row, int column) {
            return true;
        }
    }
}
