using System.Windows.Controls;

using WPFluent.Controls;

namespace WPFluent;

/// <summary>
/// Represents a contract with the service that creates <see cref="ContentDialog"/>.
/// </summary>
/// <example>
/// <code lang="xml"> &lt;ContentPresenter x:Name="RootContentDialogPresenter" Grid.Row="0" /&gt;</code> <code
/// lang="csharp"> IContentDialogService contentDialogService = new ContentDialogService();
/// contentDialogService.SetContentPresenter(RootContentDialogPresenter);  await _contentDialogService.ShowAsync( new
/// ContentDialog(){ Title = "The cake?", Content = "IS A LIE!", PrimaryButtonText = "Save", SecondaryButtonText =
/// "Don't Save", CloseButtonText = "Cancel" } );</code>
/// </example>
public class ContentDialogService : IContentDialogService
{
    private ContentPresenter? _dialogHost;

    /// <inheritdoc/>
    public ContentPresenter? GetDialogHost() { return _dialogHost; }


    /// <inheritdoc/>
    public void SetDialogHost(ContentPresenter contentPresenter) { _dialogHost = contentPresenter; }

    /// <inheritdoc/>
    public Task<ContentDialogResult> ShowAsync(ContentDialog dialog, CancellationToken cancellationToken)
    {
        if (_dialogHost == null)
        {
            throw new InvalidOperationException("The DialogHost was never set.");
        }

        if (dialog.DialogHost != null && _dialogHost != dialog.DialogHost)
        {
            throw new InvalidOperationException("The DialogHost is not the same as the one that was previously set.");
        }

        dialog.DialogHost = _dialogHost;

        return dialog.ShowAsync(cancellationToken);
    }
}