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

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

import java.awt.Dimension;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.nio.file.InvalidPathException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.regex.Pattern;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JMenu;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;
import javax.swing.filechooser.FileFilter;

import org.openstreetmap.josm.actions.DiskAccessAction;
import org.openstreetmap.josm.data.Preferences;
import org.openstreetmap.josm.data.PreferencesUtils;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.gui.MainApplication;
import org.openstreetmap.josm.gui.dialogs.LogShowDialog;
import org.openstreetmap.josm.gui.help.HelpUtil;
import org.openstreetmap.josm.gui.io.CustomConfigurator;
import org.openstreetmap.josm.gui.layer.MainLayerManager;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.gui.preferences.DefaultTabPreferenceSetting;
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.util.DocumentAdapter;
import org.openstreetmap.josm.gui.util.GuiHelper;
import org.openstreetmap.josm.gui.widgets.AbstractFileChooser;
import org.openstreetmap.josm.gui.widgets.FilterField;
import org.openstreetmap.josm.gui.widgets.JosmTextField;
import org.openstreetmap.josm.spi.preferences.Config;
import org.openstreetmap.josm.spi.preferences.Setting;
import org.openstreetmap.josm.spi.preferences.StringSetting;
import org.openstreetmap.josm.tools.GBC;
import org.openstreetmap.josm.tools.ImageProvider;
import org.openstreetmap.josm.tools.Logging;
import org.openstreetmap.josm.tools.Territories;
import org.openstreetmap.josm.tools.Utils;

/**
 * Advanced preferences, allowing to set preference entries directly.
 */
public final class AdvancedPreference extends DefaultTabPreferenceSetting {

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

    private static class UnclearableOsmDataLayer extends OsmDataLayer {
        UnclearableOsmDataLayer(DataSet data, String name) {
            super(data, name, null);
        }

        @Override
        public void clear() {
            // Do nothing
        }
    }

    /**
     * Requires {@link Logging#isDebugEnabled()}, otherwise dataset is unloaded
     * @see Territories#initializeInternalData()
     */
    private static final class EditBoundariesAction extends AbstractAction {
        EditBoundariesAction() {
            super(tr("Edit boundaries"), ImageProvider.get("dialogs/edit", ImageProvider.ImageSizes.MENU));
        }

        @Override
        public void actionPerformed(ActionEvent ae) {
            DataSet dataSet = Territories.getOriginalDataSet();
            MainLayerManager layerManager = MainApplication.getLayerManager();
            if (layerManager.getLayersOfType(OsmDataLayer.class).stream().noneMatch(l -> dataSet.equals(l.getDataSet()))) {
                layerManager.addLayer(new UnclearableOsmDataLayer(dataSet, tr("Internal JOSM boundaries")));
            }
        }
    }

    private final class ResetPreferencesAction extends AbstractAction {
        ResetPreferencesAction() {
            super(tr("Reset preferences"), ImageProvider.get("undo", ImageProvider.ImageSizes.MENU));
        }

        @Override
        public void actionPerformed(ActionEvent ae) {
            if (!GuiHelper.warnUser(tr("Reset preferences"),
                    "<html>"+
                    tr("You are about to clear all preferences to their default values<br />"+
                    "All your settings will be deleted: plugins, imagery, filters, toolbar buttons, keyboard, etc. <br />"+
                    "Are you sure you want to continue?")
                    +"</html>", null, "")) {
                Preferences.main().resetToDefault();
                try {
                    Preferences.main().save();
                } catch (IOException | InvalidPathException e) {
                    Logging.log(Logging.LEVEL_WARN, "Exception while saving preferences:", e);
                }
                readPreferences(Preferences.main());
                applyFilter();
            }
        }
    }

    private List<PrefEntry> allData;
    private final List<PrefEntry> displayData = new ArrayList<>();
    private JosmTextField txtFilter;
    private PreferencesTable table;

    private final Map<String, String> profileTypes = new LinkedHashMap<>();

    private final Comparator<PrefEntry> customComparator = (o1, o2) -> {
        if (o1.isChanged() && !o2.isChanged())
            return -1;
        if (o2.isChanged() && !o1.isChanged())
            return 1;
        if (!o1.isDefault() && o2.isDefault())
            return -1;
        if (!o2.isDefault() && o1.isDefault())
            return 1;
        return o1.compareTo(o2);
    };

    private AdvancedPreference() {
        super(/* ICON(preferences/) */ "advanced", tr("Advanced Preferences"), tr("Setting Preference entries directly. Use with caution!"));
    }

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

    @Override
    public void addGui(final PreferenceTabbedPane gui) {
        JPanel p = gui.createPreferenceTab(this);

        final JPanel txtFilterPanel = new JPanel(new GridBagLayout());
        p.add(txtFilterPanel, GBC.eol().fill(GBC.HORIZONTAL));
        txtFilter = new FilterField();
        txtFilterPanel.add(txtFilter, GBC.eol().insets(0, 0, 0, 5).fill(GBC.HORIZONTAL));
        txtFilter.getDocument().addDocumentListener(DocumentAdapter.create(ignore -> applyFilter()));
        readPreferences(Preferences.main());

        applyFilter();
        table = new PreferencesTable(displayData);
        JScrollPane scroll = new JScrollPane(table);
        p.add(scroll, GBC.eol().fill(GBC.BOTH));
        scroll.setPreferredSize(new Dimension(400, 200));

        JPanel buttonPanel = new JPanel(new GridLayout(1, 6));
        JButton add = new JButton(tr("Add"), ImageProvider.get("dialogs/add", ImageProvider.ImageSizes.SMALLICON));
        buttonPanel.add(add);
        add.setToolTipText(add.getText());
        add.addActionListener(e -> {
            PrefEntry pe = table.addPreference(gui);
            if (pe != null) {
                allData.add(pe);
                Collections.sort(allData);
                applyFilter();
            }
        });

        JButton edit = new JButton(tr("Edit"), ImageProvider.get("dialogs/edit", ImageProvider.ImageSizes.SMALLICON));
        buttonPanel.add(edit);
        edit.setToolTipText(edit.getText());
        edit.addActionListener(e -> {
            if (table.editPreference(gui))
                applyFilter();
        });
        table.getSelectionModel().addListSelectionListener(event -> edit.setEnabled(table.getSelectedRowCount() == 1));

        JButton reset = new JButton(tr("Reset"), ImageProvider.get("undo", ImageProvider.ImageSizes.SMALLICON));
        buttonPanel.add(reset);
        reset.setToolTipText(reset.getText());
        reset.addActionListener(e -> table.resetPreferences(gui));
        table.getSelectionModel().addListSelectionListener(event -> reset.setEnabled(table.getSelectedRowCount() > 0));

        JButton read = new JButton(tr("Read from file"), ImageProvider.get("open", ImageProvider.ImageSizes.SMALLICON));
        buttonPanel.add(read);
        read.setToolTipText(read.getText());
        read.addActionListener(e -> readPreferencesFromXML());

        JButton export = new JButton(tr("Export selected items"), ImageProvider.get("save", ImageProvider.ImageSizes.SMALLICON));
        buttonPanel.add(export);
        export.setToolTipText(export.getText());
        export.addActionListener(e -> exportSelectedToXML());

        final JButton more = new JButton(tr("More..."));
        buttonPanel.add(more);
        more.setToolTipText(more.getText());
        more.addActionListener(new ActionListener() {
            private final JPopupMenu menu = buildPopupMenu();
            @Override
            public void actionPerformed(ActionEvent ev) {
                if (more.isShowing()) {
                    menu.show(more, 0, 0);
                }
            }
        });
        p.add(buttonPanel, GBC.eol());
    }

    private void readPreferences(Preferences tmpPrefs) {
        Map<String, Setting<?>> loaded;
        Map<String, Setting<?>> orig = Preferences.main().getAllSettings();
        Map<String, Setting<?>> defaults = tmpPrefs.getAllDefaults();
        Preferences.main().getSensitive().forEach(orig::remove);
        tmpPrefs.getSensitive().forEach(defaults::remove);
        if (tmpPrefs != Preferences.main()) {
            loaded = tmpPrefs.getAllSettings();
            // plugins preference keys may be changed directly later, after plugins are downloaded
            // so we do not want to show it in the table as "changed" now
            Setting<?> pluginSetting = orig.get("plugins");
            if (pluginSetting != null) {
                loaded.put("plugins", pluginSetting);
            }
        } else {
            loaded = orig;
        }
        allData = prepareData(loaded, orig, defaults);
    }

    private static File[] askUserForCustomSettingsFiles(boolean saveFileFlag, String title) {
        FileFilter filter = new FileFilter() {
            @Override
            public boolean accept(File f) {
                return f.isDirectory() || Utils.hasExtension(f, "xml");
            }

            @Override
            public String getDescription() {
                return tr("JOSM custom settings files (*.xml)");
            }
        };
        AbstractFileChooser fc = DiskAccessAction.createAndOpenFileChooser(!saveFileFlag, !saveFileFlag, title, filter,
                JFileChooser.FILES_ONLY, "customsettings.lastDirectory");
        if (fc != null) {
            File[] sel = fc.isMultiSelectionEnabled() ? fc.getSelectedFiles() : new File[]{fc.getSelectedFile()};
            if (sel.length == 1 && !sel[0].getName().contains("."))
                sel[0] = new File(sel[0].getAbsolutePath()+".xml");
            return sel;
        }
        return new File[0];
    }

    private void exportSelectedToXML() {
        List<String> keys = new ArrayList<>();
        boolean hasLists = false;

        for (PrefEntry p: table.getSelectedItems()) {
            // preferences with default values are not saved
            if (!(p.getValue() instanceof StringSetting)) {
                hasLists = true; // => append and replace differs
            }
            if (!p.isDefault()) {
                keys.add(p.getKey());
            }
        }

        if (keys.isEmpty()) {
            JOptionPane.showMessageDialog(MainApplication.getMainFrame(),
                    tr("Please select some preference keys not marked as default"), tr("Warning"), JOptionPane.WARNING_MESSAGE);
            return;
        }

        File[] files = askUserForCustomSettingsFiles(true, tr("Export preferences keys to JOSM customization file"));
        if (files.length == 0) {
            return;
        }

        int answer = 0;
        if (hasLists) {
            answer = JOptionPane.showOptionDialog(
                    MainApplication.getMainFrame(), tr("What to do with preference lists when this file is to be imported?"), tr("Question"),
                    JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null,
                    new String[]{tr("Append preferences from file to existing values"), tr("Replace existing values")}, 0);
        }
        CustomConfigurator.exportPreferencesKeysToFile(files[0].getAbsolutePath(), answer == 0, keys);
    }

    private void readPreferencesFromXML() {
        File[] files = askUserForCustomSettingsFiles(false, tr("Open JOSM customization file"));
        if (files.length == 0)
            return;

        Preferences tmpPrefs = new Preferences(Preferences.main());

        StringBuilder log = new StringBuilder();
        log.append("<html>");
        for (File f : files) {
            CustomConfigurator.readXML(f, tmpPrefs);
            log.append(PreferencesUtils.getLog());
        }
        log.append("</html>");
        String msg = log.toString().replace("\n", "<br/>");

        new LogShowDialog(tr("Import log"), tr("<html>Here is file import summary. <br/>"
                + "You can reject preferences changes by pressing \"Cancel\" in preferences dialog <br/>"
                + "To activate some changes JOSM restart may be needed.</html>"), msg).showDialog();

        readPreferences(tmpPrefs);
        // sorting after modification - first modified, then non-default, then default entries
        allData.sort(customComparator);
        applyFilter();
    }

    private List<PrefEntry> prepareData(Map<String, Setting<?>> loaded, Map<String, Setting<?>> orig, Map<String, Setting<?>> defaults) {
        List<PrefEntry> data = new ArrayList<>();
        for (Entry<String, Setting<?>> e : loaded.entrySet()) {
            Setting<?> value = e.getValue();
            Setting<?> old = orig.get(e.getKey());
            Setting<?> def = defaults.get(e.getKey());
            if (def == null) {
                def = value.getNullInstance();
            }
            PrefEntry en = new PrefEntry(e.getKey(), value, def, false);
            // after changes we have nondefault value. Value is changed if is not equal to old value
            if (!Objects.equals(old, value)) {
                en.markAsChanged();
            }
            data.add(en);
        }
        for (Entry<String, Setting<?>> e : defaults.entrySet()) {
            if (!loaded.containsKey(e.getKey())) {
                PrefEntry en = new PrefEntry(e.getKey(), e.getValue(), e.getValue(), true);
                // after changes we have default value. So, value is changed if old value is not default
                Setting<?> old = orig.get(e.getKey());
                if (old != null) {
                    en.markAsChanged();
                }
                data.add(en);
            }
        }
        Collections.sort(data);
        displayData.clear();
        displayData.addAll(data);
        return data;
    }

    private JPopupMenu buildPopupMenu() {
        JPopupMenu menu = new JPopupMenu();
        profileTypes.put(marktr("shortcut"), "shortcut\\..*");
        profileTypes.put(marktr("color"), "color\\..*");
        profileTypes.put(marktr("toolbar"), "toolbar.*");
        profileTypes.put(marktr("imagery"), "imagery.*");

        for (Entry<String, String> e: profileTypes.entrySet()) {
            menu.add(new ExportProfileAction(Preferences.main(), e.getKey(), e.getValue()));
        }

        menu.addSeparator();
        menu.add(getProfileMenu());
        if (Logging.isDebugEnabled()) {
            menu.addSeparator();
            menu.add(new EditBoundariesAction());
        }
        menu.addSeparator();
        menu.add(new ResetPreferencesAction());
        return menu;
    }

    private JMenu getProfileMenu() {
        final JMenu p = new JMenu(tr("Load profile"));
        p.setIcon(ImageProvider.get("open", ImageProvider.ImageSizes.MENU));
        p.addMenuListener(new MenuListener() {
            @Override
            public void menuSelected(MenuEvent me) {
                p.removeAll();
                load(p, new File(".").listFiles());
                load(p, Config.getDirs().getPreferencesDirectory(false).listFiles());
            }

            private void load(JMenu p, File[] files) {
                if (files != null) {
                    for (File f : files) {
                        String s = f.getName();
                        int idx = s.indexOf('_');
                        if (idx >= 0) {
                            String t = s.substring(0, idx);
                            if (profileTypes.containsKey(t)) {
                                p.add(new ImportProfileAction(s, f, t));
                            }
                        }
                    }
                }
            }

            @Override
            public void menuDeselected(MenuEvent me) {
                // Not implemented
            }

            @Override
            public void menuCanceled(MenuEvent me) {
                // Not implemented
            }
        });
        return p;
    }

    private class ImportProfileAction extends AbstractAction {
        private final File file;
        private final String type;

        ImportProfileAction(String name, File file, String type) {
            super(name);
            this.file = file;
            this.type = type;
        }

        @Override
        public void actionPerformed(ActionEvent ae) {
            Preferences tmpPrefs = new Preferences(Preferences.main());
            CustomConfigurator.readXML(file, tmpPrefs);
            readPreferences(tmpPrefs);
            String prefRegex = profileTypes.get(type);
            // clean all the preferences from the chosen group
            for (PrefEntry p : allData) {
               if (p.getKey().matches(prefRegex) && !p.isDefault()) {
                    p.reset();
               }
            }
            // allow user to review the changes in table
            allData.sort(customComparator);
            applyFilter();
        }
    }

    private void applyFilter() {
        displayData.clear();
        for (PrefEntry e : allData) {
            String prefKey = e.getKey();
            Setting<?> valueSetting = e.getValue();
            String prefValue = valueSetting.getValue() == null ? "" : valueSetting.getValue().toString();


            // Make 'wmsplugin cache' search for e.g. 'cache.wmsplugin'
            final String prefKeyLower = prefKey.toLowerCase(Locale.ENGLISH);
            final String prefValueLower = prefValue.toLowerCase(Locale.ENGLISH);
            String filter = txtFilter.getText(); // see #19825
            final boolean canHas = filter.isEmpty() || Pattern.compile("\\s+").splitAsStream(filter)
                    .map(bit -> bit.toLowerCase(Locale.ENGLISH))
                    .anyMatch(bit -> {
                        switch (bit) {
                            // syntax inspired by SearchCompiler
                            case "changed":
                                return e.isChanged();
                            case "modified":
                            case "-default":
                                return !e.isDefault();
                            case "-modified":
                            case "default":
                                return e.isDefault();
                            default:
                                return prefKeyLower.contains(bit) || prefValueLower.contains(bit);
                        }
                    });
            if (canHas) {
                displayData.add(e);
            }
        }
        if (table != null)
            table.fireDataChanged();
    }

    @Override
    public boolean ok() {
        for (PrefEntry e : allData) {
            if (e.isChanged()) {
                Preferences.main().putSetting(e.getKey(), e.getValue().getValue() == null ? null : e.getValue());
            }
        }
        return false;
    }

    @Override
    public String getHelpContext() {
        return HelpUtil.ht("/Preferences/Advanced");
    }
}