using Avalonia.Controls;
using Avalonia.Input;

namespace DodoSSH.Client.App.Views;

/// <summary>The window that is up while the application composes itself.</summary>
/// <remarks>
/// A frame around <see cref="SplashCard"/> and nothing else. Its whole lifetime is one call to
/// <c>DodoSshApp.ComposeBehind</c>: shown by the desktop lifetime as the main window, replaced by the real
/// one, closed. The exception is a composition that fails, which is the only case this window outlives.
/// </remarks>
internal sealed partial class SplashWindow : Window
{
    /// <summary>
    /// Whether Escape may close this.
    /// </summary>
    /// <remarks>
    /// False while composition is running, and that is not caution for its own sake: this window has no
    /// close button, so Escape is the only key it could offer — and closing it mid-composition would leave a
    /// process that has opened the cache and bound a socket with no window and no way to reach either. Once
    /// there is nothing left to wait for, it is the only way out and has to work.
    /// </remarks>
    private bool escapable;

    public SplashWindow()
    {
        InitializeComponent();

        KeyDown += (_, e) =>
        {
            if (escapable && e.Key == Key.Escape)
            {
                Close();
            }
        };
    }

    /// <summary>Says what is happening, while it still is.</summary>
    internal void Say(string what) => Card.Say(what);

    /// <summary>
    /// Says why nothing is going to happen, and becomes the last window there is.
    /// </summary>
    /// <remarks>
    /// The way out is named in the message rather than drawn as a button. A failure here is a broken
    /// installation — a cache that cannot be opened, a port that cannot be bound — so what this window is
    /// for at that point is carrying one sentence to whoever has to act on it, and a control that has to be
    /// laid out and measured to say "close me" earns less than the words do.
    /// </remarks>
    internal void CouldNotStart(string why)
    {
        escapable = true;

        Card.CouldNotStart($"DodoSSH could not start: {why} Press Escape to close.");
    }
}