package com.ts3client.ui;

import com.ts3client.config.Settings;
import com.ts3client.sound.NotificationSettings;
import com.ts3client.sound.SoundEvent;
import com.ts3client.sound.SoundNotifier;
import com.ts3client.sound.SoundPack;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSlider;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * Options page for sound packs: which pack is active, how loud it is, and what
 * each action does.
 *
 * <p>An action can be switched off entirely, or marked <em>important</em> (shown in
 * bold) — important actions are the only ones still played while the speakers are
 * muted, which is how the official client behaves. Actions the active pack has no
 * sound for are greyed out.
 */
final class NotificationsPanel extends JPanel {

    private static final int TOGGLE_COLUMN_WIDTH = 34;

    /** A table row: either a category heading or one action. */
    private static final class Row {
        final SoundEvent.Category heading;
        final SoundEvent event;

        Row(SoundEvent.Category heading, SoundEvent event) {
            this.heading = heading;
            this.event = event;
        }

        boolean isHeading() {
            return event == null;
        }
    }

    private final Settings settings;
    private final SoundNotifier sounds;
    /** Edited copy, applied to the settings only when the dialog is confirmed. */
    private final NotificationSettings working;
    private final List<Row> rows = new ArrayList<>();
    private final String originalPackId;
    private final String originalPackDir;

    private final JComboBox<SoundPack> packCombo = new JComboBox<>();
    private final JLabel packInfo = new JLabel();
    private final JSlider volume;
    private final JTextField packDirField;
    private final JTable table;
    private final EventTableModel tableModel = new EventTableModel();

    NotificationsPanel(Settings settings, SoundNotifier sounds) {
        super(new BorderLayout(0, 8));
        this.settings = settings;
        this.sounds = sounds;
        this.working = settings.notifications.copy();
        this.originalPackId = settings.soundPack;
        this.originalPackDir = settings.soundPackDir;
        this.volume = new JSlider(0, 100, (int) Math.round(settings.soundVolume * 100));
        this.packDirField = new JTextField(settings.soundPackDir, 18);

        buildRows();
        this.table = buildTable();

        setBorder(BorderFactory.createEmptyBorder(12, 12, 12, 12));
        add(buildHeader(), BorderLayout.NORTH);
        add(new JScrollPane(table), BorderLayout.CENTER);
        add(buildFooter(), BorderLayout.SOUTH);

        reloadPacks();
    }

    /** Copies the edited state into the settings; the caller saves them. */
    void apply() {
        settings.notifications.copyFrom(working);
        settings.soundVolume = volume.getValue() / 100.0;
        String directory = packDirField.getText().trim();
        boolean rescan = !directory.equals(settings.soundPackDir);
        settings.soundPackDir = directory;
        sounds.setPack((SoundPack) packCombo.getSelectedItem());
        if (rescan) sounds.reload();
    }

    /** Puts back the pack (and folder) the dialog started with, for a cancelled edit. */
    void revert() {
        settings.soundPackDir = originalPackDir;
        settings.soundPack = originalPackId;
        sounds.reload();
    }

    // ---- layout ----

    private JComponent buildHeader() {
        JPanel p = new JPanel(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        c.insets = new Insets(2, 2, 2, 2);
        c.anchor = GridBagConstraints.WEST;
        c.fill = GridBagConstraints.HORIZONTAL;

        packCombo.setToolTipText("Sound packs installed here or in a TeamSpeak 3 client");
        packCombo.addActionListener(e -> onPackSelected());
        JButton test = new JButton("Test");
        test.setToolTipText("Play this pack's test sound");
        test.addActionListener(e -> sounds.preview(SoundEvent.SPECIAL_SOUND_TEST));

        JPanel packRow = new JPanel(new BorderLayout(6, 0));
        packRow.add(packCombo, BorderLayout.CENTER);
        packRow.add(test, BorderLayout.EAST);

        int row = 0;
        addRow(p, c, row++, new JLabel("Sound pack:"), packRow);
        c.gridx = 1;
        c.gridy = row++;
        packInfo.setEnabled(false);
        p.add(packInfo, c);

        volume.setToolTipText("Volume of the notification sounds");
        addRow(p, c, row++, new JLabel("Sound volume:"), volume);

        JPanel dirRow = new JPanel(new BorderLayout(6, 0));
        JButton browse = new JButton("Browse…");
        browse.addActionListener(e -> browseForPackFolder());
        dirRow.add(packDirField, BorderLayout.CENTER);
        dirRow.add(browse, BorderLayout.EAST);
        packDirField.setToolTipText("Extra folder to look for sound packs in");
        addRow(p, c, row, new JLabel("Extra pack folder:"), dirRow);
        return p;
    }

    private JComponent buildFooter() {
        JPanel p = new JPanel(new BorderLayout(6, 0));
        JLabel hint = new JLabel("<html><b>Bold</b> actions are important: they are still played "
                + "while your speakers are muted.</html>");
        hint.setBorder(BorderFactory.createEmptyBorder(4, 0, 0, 0));

        JPanel buttons = new JPanel();
        JButton important = new JButton("Toggle important");
        important.addActionListener(e -> toggleImportant());
        JButton play = new JButton("Play");
        play.addActionListener(e -> previewSelected());
        JButton defaults = new JButton("Reset");
        defaults.setToolTipText("Restore the default notification settings");
        defaults.addActionListener(e -> {
            working.resetToDefaults();
            tableModel.fireTableDataChanged();
        });
        buttons.add(play);
        buttons.add(important);
        buttons.add(defaults);

        p.add(hint, BorderLayout.CENTER);
        p.add(buttons, BorderLayout.EAST);
        return p;
    }

    private JTable buildTable() {
        JTable t = new JTable(tableModel);
        t.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        t.setShowGrid(false);
        t.setTableHeader(null);
        t.setRowHeight(Math.max(t.getRowHeight(), t.getFontMetrics(t.getFont()).getHeight() + 6));
        t.getColumnModel().getColumn(0).setMaxWidth(TOGGLE_COLUMN_WIDTH);
        t.getColumnModel().getColumn(0).setMinWidth(TOGGLE_COLUMN_WIDTH);
        t.getColumnModel().getColumn(0).setCellRenderer(new ToggleRenderer(t.getDefaultRenderer(Boolean.class)));
        t.getColumnModel().getColumn(1).setCellRenderer(new ActionRenderer());
        t.setPreferredScrollableViewportSize(new Dimension(360, 260));

        t.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2 && e.getButton() == MouseEvent.BUTTON1) previewSelected();
            }

            @Override
            public void mousePressed(MouseEvent e) {
                showMenu(e);
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                showMenu(e);
            }

            private void showMenu(MouseEvent e) {
                if (!e.isPopupTrigger()) return;
                int row = t.rowAtPoint(e.getPoint());
                if (row < 0 || rows.get(row).isHeading()) return;
                t.setRowSelectionInterval(row, row);
                contextMenu(rows.get(row).event).show(t, e.getX(), e.getY());
            }
        });
        return t;
    }

    private JPopupMenu contextMenu(SoundEvent event) {
        JPopupMenu menu = new JPopupMenu();
        JMenuItem important = new JMenuItem(working.isImportant(event) ? "Mark as Unimportant" : "Mark as Important");
        important.addActionListener(e -> toggleImportant());
        JMenuItem enabled = new JMenuItem(working.isEnabled(event) ? "Turn sound off" : "Turn sound on");
        enabled.addActionListener(e -> {
            working.setEnabled(event, !working.isEnabled(event));
            tableModel.fireTableRowsUpdated(0, rows.size() - 1);
        });
        JMenuItem play = new JMenuItem("Play sound");
        play.addActionListener(e -> sounds.preview(event));
        menu.add(play);
        menu.addSeparator();
        menu.add(enabled);
        menu.add(important);
        return menu;
    }

    // ---- actions ----

    private void onPackSelected() {
        SoundPack pack = (SoundPack) packCombo.getSelectedItem();
        sounds.setPack(pack);
        packInfo.setText(pack == null ? "No sound packs found"
                : "by " + (pack.author().isEmpty() ? "unknown" : pack.author())
                + (pack.version().isEmpty() ? "" : ", version " + pack.version()));
        tableModel.fireTableDataChanged();
    }

    private void reloadPacks() {
        sounds.reload();
        packCombo.removeAllItems();
        for (SoundPack pack : sounds.availablePacks()) {
            packCombo.addItem(pack);
        }
        packCombo.setSelectedItem(sounds.pack());
        onPackSelected();
    }

    private void browseForPackFolder() {
        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        chooser.setDialogTitle("Folder containing sound packs");
        String current = packDirField.getText().trim();
        if (!current.isEmpty()) chooser.setCurrentDirectory(new File(current));
        if (chooser.showOpenDialog(this) != JFileChooser.APPROVE_OPTION) return;
        packDirField.setText(chooser.getSelectedFile().getAbsolutePath());
        settings.soundPackDir = packDirField.getText();
        reloadPacks();
    }

    private SoundEvent selectedEvent() {
        int row = table.getSelectedRow();
        return row < 0 || rows.get(row).isHeading() ? null : rows.get(row).event;
    }

    private void previewSelected() {
        SoundEvent event = selectedEvent();
        if (event != null) sounds.preview(event);
    }

    private void toggleImportant() {
        SoundEvent event = selectedEvent();
        if (event == null) return;
        working.setImportant(event, !working.isImportant(event));
        tableModel.fireTableRowsUpdated(table.getSelectedRow(), table.getSelectedRow());
    }

    private void buildRows() {
        for (SoundEvent.Category category : SoundEvent.Category.values()) {
            rows.add(new Row(category, null));
            for (SoundEvent event : SoundEvent.values()) {
                if (event.category() == category) rows.add(new Row(category, event));
            }
        }
    }

    private static void addRow(JPanel p, GridBagConstraints c, int row, JLabel label, Component field) {
        c.gridx = 0;
        c.gridy = row;
        c.weightx = 0;
        p.add(label, c);
        c.gridx = 1;
        c.weightx = 1;
        p.add(field, c);
    }

    // ---- table plumbing ----

    private final class EventTableModel extends AbstractTableModel {

        @Override
        public int getRowCount() {
            return rows.size();
        }

        @Override
        public int getColumnCount() {
            return 2;
        }

        @Override
        public Class<?> getColumnClass(int column) {
            return column == 0 ? Boolean.class : String.class;
        }

        @Override
        public Object getValueAt(int rowIndex, int column) {
            Row row = rows.get(rowIndex);
            if (column == 0) return row.isHeading() ? Boolean.FALSE : working.isEnabled(row.event);
            return row.isHeading() ? row.heading.label() : row.event.label();
        }

        @Override
        public boolean isCellEditable(int rowIndex, int column) {
            return column == 0 && !rows.get(rowIndex).isHeading();
        }

        @Override
        public void setValueAt(Object value, int rowIndex, int column) {
            Row row = rows.get(rowIndex);
            if (column == 0 && !row.isHeading()) {
                working.setEnabled(row.event, Boolean.TRUE.equals(value));
            }
        }
    }

    /** Only actions get a checkbox; a category heading spans an empty cell. */
    private final class ToggleRenderer implements javax.swing.table.TableCellRenderer {

        private final javax.swing.table.TableCellRenderer checkBox;
        private final DefaultTableCellRenderer blank = new DefaultTableCellRenderer();

        ToggleRenderer(javax.swing.table.TableCellRenderer checkBox) {
            this.checkBox = checkBox;
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean selected,
                                                       boolean focused, int rowIndex, int column) {
            javax.swing.table.TableCellRenderer delegate = rows.get(rowIndex).isHeading() ? blank : checkBox;
            return delegate.getTableCellRendererComponent(table,
                    delegate == blank ? "" : value, selected, focused, rowIndex, column);
        }
    }

    /** Headings stand out, important actions are bold, unmapped ones are greyed. */
    private final class ActionRenderer extends DefaultTableCellRenderer {

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean selected,
                                                       boolean focused, int rowIndex, int column) {
            super.getTableCellRendererComponent(table, value, selected, focused, rowIndex, column);
            Row row = rows.get(rowIndex);
            Font base = table.getFont();
            // The foreground is set on every row: this renderer remembers the last
            // unselected colour it was given, so a greyed row would tint the rest.
            if (row.isHeading()) {
                setFont(base.deriveFont(Font.BOLD));
                setForeground(selected ? table.getSelectionForeground() : table.getForeground());
                setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
                setToolTipText(null);
                return this;
            }
            setBorder(BorderFactory.createEmptyBorder(2, 18, 2, 2));
            setFont(base.deriveFont(working.isImportant(row.event) ? Font.BOLD : Font.PLAIN));
            boolean silent = !sounds.hasSound(row.event);
            setForeground(selected ? table.getSelectionForeground()
                    : silent ? java.awt.Color.GRAY : table.getForeground());
            setToolTipText(silent ? "This sound pack has no sound for this action" : null);
            return this;
        }
    }
}