using System.IO;
using System.Windows;
using System.Windows.Input;

namespace ytLive;

/// <summary>Modal that lets the creator rename an auto-named recording before it is
/// finalized. Returns the chosen file stem (no extension) via <see cref="ResultFileName"/>,
/// or <c>null</c> when the creator cleared the box and hit Save (keep the auto name).
/// <para><c>DialogResult == false</c> means DISCARD — the caller deletes the footage
/// rather than saving it (CREATOR RULING 2026-09-26). Enter on the pre-filled default
/// is a Save.</para></summary>
public partial class RenameRecordingDialog : Window
{
    private readonly string _autoStem;

    /// <summary>Stem (no extension) the creator chose, or <c>null</c> when the box was
    /// cleared on an explicit Save. Never set on Cancel.</summary>
    public string? ResultFileName { get; private set; }

    public RenameRecordingDialog(string autoStem)
    {
        InitializeComponent();
        _autoStem = autoStem;
        NameBox.Text = autoStem;
        Loaded += (_, _) => { NameBox.Focus(); NameBox.SelectAll(); };
        NameBox.KeyDown += OnKeyDown;
    }

    private void OnKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter) { Save(); e.Handled = true; }
        else if (e.Key == Key.Escape) { DialogResult = false; e.Handled = true; }
    }

    private void Cancel_Click(object sender, RoutedEventArgs e) => DialogResult = false;

    private void Save_Click(object sender, RoutedEventArgs e) => Save();

    private void Save()
    {
        var name = NameBox.Text?.Trim();
        if (string.IsNullOrEmpty(name))
        {
            // Empty = keep the auto name.
            ResultFileName = null;
            DialogResult = true;
            return;
        }

        // Strip any accidental ".mp4" so we return a clean stem.
        if (name.EndsWith(".mp4", StringComparison.OrdinalIgnoreCase))
            name = Path.GetFileNameWithoutExtension(name);

        // Reject characters that are illegal in Windows file names.
        if (name.IndexOfAny(Path.GetInvalidFileNameChars()) >= 0)
        {
            MessageBox.Show(this, "That name contains characters not allowed in file names.",
                "Invalid name", MessageBoxButton.OK, MessageBoxImage.Warning);
            NameBox.Focus();
            return;
        }

        ResultFileName = name;
        DialogResult = true;
    }
}