using System.IO;
using System.Windows;

namespace TeamsISO.App;

/// <summary>
/// First-launch welcome dialog. Walks the user through the once-per-machine
/// setup that's not derivable from the UI alone (NDI runtime install, Teams
/// admin permission, transcoder topology) and points them at where logs and
/// presets live for later self-service.
///
/// Suppression is governed by a marker file at
/// <c>%LOCALAPPDATA%\TeamsISO\onboarding.flag</c>. The presence of the file —
/// regardless of contents — means "don't show again." The user can restore
/// the dialog by deleting that file.
/// </summary>
public partial class OnboardingWindow : Window
{
    private static string FlagPath =>
        Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
            "TeamsISO", "onboarding.flag");

    public OnboardingWindow() => InitializeComponent();

    /// <summary>
    /// Returns true on first launch (and on launches where the user previously
    /// unchecked "Don't show this again" so the marker file was never created).
    /// </summary>
    public static bool ShouldShow()
    {
        try { return !File.Exists(FlagPath); }
        catch { return false; } // permission errors → assume already shown
    }

    private void OnDismiss(object sender, RoutedEventArgs e)
    {
        if (SuppressBox.IsChecked == true)
        {
            try
            {
                var dir = Path.GetDirectoryName(FlagPath);
                if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
                File.WriteAllText(FlagPath,
                    "Onboarding dialog dismissed at " + DateTimeOffset.UtcNow.ToString("o") + ". " +
                    "Delete this file to see the welcome dialog again on next launch.");
            }
            catch
            {
                // Disk full / permission denied — show the dialog again next launch
                // rather than fail noisily.
            }
        }
        DialogResult = true;
        Close();
    }
}