package com.ts3client.ui;

import com.ts3client.config.AwayMessages;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.table.AbstractTableModel;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Frame;

/**
 * Editor for the away-message presets: a plain list of entries that are renamed
 * by double-clicking them, plus Add and Remove.
 *
 * <p>Backed by a one-column table because that is what gives Swing's list look
 * inline editing for free. Every change is written straight through to the
 * {@link AwayMessages} store.
 */
public final class AwayMessagesDialog extends JDialog {

    private final AwayMessages messages;
    private final Runnable onChanged;
    private final Model model = new Model();
    private final JTable table = new JTable(model);

    public AwayMessagesDialog(Frame owner, AwayMessages messages, Runnable onChanged) {
        super(owner, "Away Message Presets", true);
        this.messages = messages;
        this.onChanged = onChanged;

        table.setTableHeader(null);
        table.setShowGrid(false);
        table.setFillsViewportHeight(true);
        table.setRowHeight(Math.max(20, table.getRowHeight()));
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        // Single click selects, double click starts editing — like a renameable list.
        table.putClientProperty("JTable.autoStartsEdit", Boolean.FALSE);

        JScrollPane scroll = new JScrollPane(table);
        scroll.setBorder(BorderFactory.createEmptyBorder(8, 8, 4, 8));

        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(scroll, BorderLayout.CENTER);
        getContentPane().add(buildButtons(), BorderLayout.SOUTH);

        Dialogs.closeOnEscape(this, this::closeDialog);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setSize(new Dimension(360, 300));
        setLocationRelativeTo(owner);
    }

    private JPanel buildButtons() {
        JPanel buttons = new JPanel();
        buttons.setLayout(new BoxLayout(buttons, BoxLayout.X_AXIS));
        buttons.setBorder(BorderFactory.createEmptyBorder(0, 8, 8, 8));
        addButton(buttons, "Add", this::addEntry);
        addButton(buttons, "Remove", this::removeSelected);
        buttons.add(Box.createHorizontalGlue());
        addButton(buttons, "Close", this::closeDialog);
        return buttons;
    }

    private void addButton(JPanel panel, String text, Runnable action) {
        JButton b = new JButton(text);
        b.addActionListener(e -> action.run());
        panel.add(b);
        panel.add(Box.createHorizontalStrut(4));
    }

    private void addEntry() {
        stopEditing();
        messages.add("New away message");
        int row = messages.all().size() - 1;
        model.fireTableRowsInserted(row, row);
        table.setRowSelectionInterval(row, row);
        table.scrollRectToVisible(table.getCellRect(row, 0, true));
        persist();
        table.editCellAt(row, 0);
        if (table.getEditorComponent() != null) table.getEditorComponent().requestFocusInWindow();
    }

    private void removeSelected() {
        stopEditing();
        int row = table.getSelectedRow();
        if (row < 0) return;
        messages.remove(row);
        model.fireTableRowsDeleted(row, row);
        if (!messages.all().isEmpty()) {
            int next = Math.min(row, messages.all().size() - 1);
            table.setRowSelectionInterval(next, next);
        }
        persist();
    }

    private void closeDialog() {
        stopEditing();
        dispose();
    }

    /** Flushes a cell that is still being edited so its text is not lost. */
    private void stopEditing() {
        if (table.isEditing()) table.getCellEditor().stopCellEditing();
    }

    private void persist() {
        messages.save();
        if (onChanged != null) onChanged.run();
    }

    private final class Model extends AbstractTableModel {

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

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

        @Override
        public Object getValueAt(int row, int column) {
            return messages.all().get(row);
        }

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

        @Override
        public void setValueAt(Object value, int row, int column) {
            String text = value == null ? "" : value.toString().trim();
            if (text.isEmpty()) return; // an emptied entry keeps its old text
            messages.set(row, text);
            persist();
        }
    }
}