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

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

import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

import javax.swing.AbstractAction;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.KeyStroke;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;

import org.openstreetmap.josm.command.ChangePropertyCommand;
import org.openstreetmap.josm.data.UndoRedoHandler;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.gui.ExtendedDialog;
import org.openstreetmap.josm.gui.MainApplication;
import org.openstreetmap.josm.gui.util.GuiHelper;
import org.openstreetmap.josm.gui.util.TableHelper;
import org.openstreetmap.josm.tools.GBC;
import org.openstreetmap.josm.tools.TextTagParser;

/**
 * Dialog to add tags as part of the remotecontrol.
 * Existing Keys get grey color and unchecked selectboxes so they will not overwrite the old Key-Value-Pairs by default.
 * You can choose the tags you want to add by selectboxes. You can edit the tags before you apply them.
 * @author master
 * @since 3850
 */
public class AddTagsDialog extends ExtendedDialog {

    private final JTable propertyTable;
    private final transient Collection<? extends OsmPrimitive> sel;
    private final int[] count;

    private final String sender;
    private static final Set<String> trustedSenders = new HashSet<>();

    static final class PropertyTableModel extends DefaultTableModel {
        private final Class<?>[] types = {Boolean.class, String.class, Object.class, ExistingValues.class};

        PropertyTableModel(int rowCount) {
            super(new String[] {tr("Assume"), tr("Key"), tr("Value"), tr("Existing values")}, rowCount);
        }

        @Override
        public Class<?> getColumnClass(int c) {
            return types[c];
        }
    }

    /**
     * Class for displaying "delete from ... objects" in the table
     */
    static class DeleteTagMarker {
        private final int num;

        DeleteTagMarker(int num) {
            this.num = num;
        }

        @Override
        public String toString() {
            return tr("<delete from {0} objects>", num);
        }
    }

    /**
     * Class for displaying list of existing tag values in the table
     */
    static class ExistingValues {
        private final String tag;
        private final Map<String, Integer> valueCount;

        ExistingValues(String tag) {
            this.tag = tag;
            this.valueCount = new HashMap<>();
        }

        int addValue(String val) {
            Integer c = valueCount.get(val);
            int r = c == null ? 1 : (c + 1);
            valueCount.put(val, r);
            return r;
        }

        @Override
        public String toString() {
            return String.join(", ", valueCount.keySet());
        }

        private String getToolTip() {
            return valueCount.entrySet().stream()
                    .map(e -> "<b>" + e.getValue() + " x </b>" + e.getKey() + "<br/>")
                    .collect(Collectors.joining("", "<html>" + tr("Old values of") + " <b>" + tag + "</b><br/>", "</html>"));
        }
    }

    /**
     * Constructs a new {@code AddTagsDialog}.
     * @param tags tags to add
     * @param senderName String for skipping confirmations. Use empty string for always confirmed adding.
     * @param primitives OSM objects that will be modified
     */
    public AddTagsDialog(String[][] tags, String senderName, Collection<? extends OsmPrimitive> primitives) {
        super(MainApplication.getMainFrame(), tr("Add tags to selected objects"),
                new String[] {tr("Add selected tags"), tr("Add all tags"), tr("Cancel")},
                false,
                true);
        setToolTipTexts(tr("Add checked tags to selected objects"), tr("Shift+Enter: Add all tags to selected objects"), "");

        this.sender = senderName;

        final DefaultTableModel tm = new PropertyTableModel(tags.length);

        sel = primitives;
        count = new int[tags.length];

        for (int i = 0; i < tags.length; i++) {
            count[i] = 0;
            String key = tags[i][0];
            String value = tags[i][1];
            String oldValue;
            boolean b = Boolean.TRUE;
            ExistingValues old = new ExistingValues(key);
            for (OsmPrimitive osm : sel) {
                oldValue = osm.get(key);
                if (oldValue != null) {
                    old.addValue(oldValue);
                    if (!oldValue.equals(value)) {
                        b = Boolean.FALSE;
                        count[i]++;
                    }
                }
            }
            tm.setValueAt(b, i, 0);
            tm.setValueAt(tags[i][0], i, 1);
            tm.setValueAt(tags[i][1].isEmpty() ? new DeleteTagMarker(count[i]) : tags[i][1], i, 2);
            tm.setValueAt(old, i, 3);
        }

        propertyTable = new JTable(tm) {

            @Override
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Component c = super.prepareRenderer(renderer, row, column);
                if (count[row] > 0) {
                    c.setFont(c.getFont().deriveFont(Font.ITALIC));
                    c.setForeground(new Color(100, 100, 100));
                } else {
                    c.setFont(c.getFont().deriveFont(Font.PLAIN));
                    c.setForeground(new Color(0, 0, 0));
                }
                return c;
            }

            @Override
            public TableCellEditor getCellEditor(int row, int column) {
                Object value = getValueAt(row, column);
                if (value instanceof DeleteTagMarker) return null;
                if (value instanceof ExistingValues) return null;
                return getDefaultEditor(value.getClass());
            }

            @Override
            public String getToolTipText(MouseEvent event) {
                int r = rowAtPoint(event.getPoint());
                int c = columnAtPoint(event.getPoint());
                if (r < 0 || c < 0) {
                    return getToolTipText();
                }
                Object o = getValueAt(r, c);
                if (c == 1 || c == 2) return o.toString();
                if (c == 3) return ((ExistingValues) o).getToolTip();
                return tr("Enable the checkbox to accept the value");
            }
        };

        TableHelper.setFont(propertyTable, getClass());
        propertyTable.setAutoCreateRowSorter(true);
        propertyTable.setAutoResizeMode(JTable.AUTO_RESIZE_LAST_COLUMN);
        // a checkbox has a size of 15 px
        propertyTable.getColumnModel().getColumn(0).setMaxWidth(15);
        TableHelper.adjustColumnWidth(propertyTable, 1, 150);
        TableHelper.adjustColumnWidth(propertyTable, 2, 400);
        TableHelper.adjustColumnWidth(propertyTable, 3, 300);
        // get edit results if the table looses the focus, for example if a user clicks "add tags"
        propertyTable.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
        propertyTable.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, InputEvent.SHIFT_DOWN_MASK), "shiftenter");
        propertyTable.getActionMap().put("shiftenter", new AbstractAction() {
            @Override public void actionPerformed(ActionEvent e) {
                buttonAction(1, e); // add all tags on Shift-Enter
            }
        });

        // set the content of this AddTagsDialog consisting of the tableHeader and the table itself.
        JPanel tablePanel = new JPanel(new GridBagLayout());
        tablePanel.add(propertyTable.getTableHeader(), GBC.eol().fill(GBC.HORIZONTAL));
        tablePanel.add(propertyTable, GBC.eol().fill(GBC.BOTH));
        if (!sender.isEmpty() && !trustedSenders.contains(sender)) {
            final JCheckBox c = new JCheckBox();
            c.setAction(new AbstractAction(tr("Accept all tags from {0} for this session", sender)) {
                @Override public void actionPerformed(ActionEvent e) {
                    if (c.isSelected())
                        trustedSenders.add(sender);
                    else
                        trustedSenders.remove(sender);
                }
            });
            tablePanel.add(c, GBC.eol().insets(20, 10, 0, 0));
        }
        setContent(tablePanel);
        setDefaultButton(2);
    }

    /**
     * If you click the "Add tags" button build a ChangePropertyCommand for every key that has a checked checkbox
     * to apply the key value pair to all selected osm objects.
     * You get a entry for every key in the command queue.
     */
    @Override
    protected void buttonAction(int buttonIndex, ActionEvent evt) {
        // if layer all layers were closed, ignore all actions
        if (buttonIndex != 2 && MainApplication.getLayerManager().getEditDataSet() != null) {
            TableModel tm = propertyTable.getModel();
            for (int i = 0; i < tm.getRowCount(); i++) {
                if (buttonIndex == 1 || Boolean.TRUE.equals(tm.getValueAt(i, 0))) {
                    String key = (String) tm.getValueAt(i, 1);
                    Object value = tm.getValueAt(i, 2);
                    UndoRedoHandler.getInstance().add(new ChangePropertyCommand(sel,
                            key, value instanceof String ? (String) value : ""));
                }
            }
        }
        if (buttonIndex == 2) {
            trustedSenders.remove(sender);
        }
        setVisible(false);
    }

    /**
     * parse addtags parameters Example URL (part):
     * addtags=wikipedia:de%3DResidenzschloss Dresden|name:en%3DDresden Castle
     * @param args request arguments (URL encoding already removed)
     * @param sender is a string for skipping confirmations. Use empty string for always confirmed adding.
     * @param primitives OSM objects that will be modified
     */
    public static void addTags(final Map<String, String> args, final String sender, final Collection<? extends OsmPrimitive> primitives) {
        if (args.containsKey("addtags")) {
            GuiHelper.executeByMainWorkerInEDT(() -> {
                String[][] tags = parseUrlTagsToKeyValues(args.get("addtags"))
                        .entrySet().stream()
                        .map(e -> new String[]{e.getKey(), e.getValue()})
                        .toArray(String[][]::new);
                addTags(tags, sender, primitives);
            });
        }
    }

    /**
     * Convert a argument from a url to a series of tags
     * @param urlSection A url section that looks like {@code tag1=value1|tag2=value2}
     * @return An 2d array in the format of {@code [key][value]}
     * @since 15316
     */
    public static Map<String, String> parseUrlTagsToKeyValues(String urlSection) {
        Map<String, String> tags = TextTagParser.readTagsByRegexp(urlSection, "\\|", "(.*?)=(.*?)", false);
        return tags == null ? Collections.emptyMap() : tags;
    }

    /**
     * Ask user and add the tags he confirm.
     * @param keyValue is a table or {{tag1,val1},{tag2,val2},...}
     * @param sender is a string for skipping confirmations. Use empty string for always confirmed adding.
     * @param primitives OSM objects that will be modified
     * @since 7521
     */
    public static void addTags(String[][] keyValue, String sender, Collection<? extends OsmPrimitive> primitives) {
        if (trustedSenders.contains(sender)) {
            if (MainApplication.getLayerManager().getEditDataSet() != null) {
                for (String[] row : keyValue) {
                    UndoRedoHandler.getInstance().add(new ChangePropertyCommand(primitives, row[0], row[1]));
                }
            }
        } else {
            new AddTagsDialog(keyValue, sender, primitives).showDialog();
        }
    }
}
