using Avalonia.Controls;
using Avalonia.Interactivity;
using Nonemm.App.Configuration;

namespace Nonemm.App.Windows;

/// The Buttons tab: the twelve command buttons under the traffic, as N1MM's
/// telnet window has.
public sealed partial class TelnetWindow
{
    /// N1MM stops at twelve buttons; this shows as many as are defined, and one
    /// empty row to write the next one in.
    private const int LeastButtonRows = 12;

    private readonly List<(TextBox Label, TextBox Command)> buttonRows = [];

    private void LoadButtonRows()
    {
        buttonRows.Clear();
        ButtonRows.Children.Clear();
        ButtonRows.RowDefinitions.Clear();
        IReadOnlyList<StoredTelnetButton> stored = Buttons();
        int rows = Math.Max(LeastButtonRows, stored.Count + 1);
        for (int at = 0; at < rows; at++)
        {
            ButtonRows.RowDefinitions.Add(new RowDefinition(GridLength.Auto));
            StoredTelnetButton button = at < stored.Count ? stored[at] : new StoredTelnetButton();
            TextBox label = Box(at, 0, button.Label, "label");
            TextBox command = Box(at, 2, button.Command, "sh/dx; sh/wwv");
            buttonRows.Add((label, command));
        }
    }

    private TextBox Box(int row, int column, string text, string placeholder)
    {
        TextBox box = new()
        {
            Text = text,
            PlaceholderText = placeholder,
            Margin = new Avalonia.Thickness(0, 0, 0, 4),
        };
        Grid.SetRow(box, row);
        Grid.SetColumn(box, column);
        ButtonRows.Children.Add(box);
        return box;
    }

    private void OnSaveButtons(object? sender, RoutedEventArgs e)
    {
        session.Save(session.Settings with
        {
            TelnetButtons = [.. buttonRows
                .Select(row => new StoredTelnetButton
                {
                    Label = (row.Label.Text ?? "").Trim(),
                    Command = (row.Command.Text ?? "").Trim(),
                })
                .Where(button => button.Label.Length > 0 && button.Command.Length > 0)],
        });
        LoadButtons();
        Show("*** buttons saved", NoticeColour);
    }

    private void OnResetButtons(object? sender, RoutedEventArgs e)
    {
        session.Save(session.Settings with { TelnetButtons = [] });
        LoadButtons();
        LoadButtonRows();
        Show("*** buttons back to the defaults", NoticeColour);
    }
}