namespace SharepointToolbox.Web.Core.Config;

/// <summary>
/// The app's public domain (e.g. <c>sptb.example.com</c> or <c>https://sptb.example.com</c>),
/// configured via <c>App__Domain</c>. Used to derive the SharePoint-connect redirect URI when
/// <see cref="ClientConnectOptions.RedirectUri"/> isn't set explicitly.
/// </summary>
public class AppDomainOptions
{
    public string Domain { get; set; } = string.Empty;

    /// <summary>
    /// Builds an absolute URL for <paramref name="path"/> rooted at the configured domain, or
    /// <c>null</c> when no domain is set. Defaults to <c>https</c> when the domain has no scheme,
    /// and tolerates accidental surrounding quotes / trailing slashes (docker-compose's list-form
    /// env values can embed literal quotes).
    /// </summary>
    public string? BuildUrl(string path)
    {
        var domain = Domain?.Trim().Trim('"', '\'').TrimEnd('/');
        if (string.IsNullOrEmpty(domain))
            return null;

        if (!domain.Contains("://", StringComparison.Ordinal))
            domain = "https://" + domain;

        return domain + "/" + path.TrimStart('/');
    }

    /// <summary>
    /// The configured domain as an absolute base <see cref="Uri"/> (scheme + host [+ port]), or
    /// <c>null</c> when no domain is set or it can't be parsed.
    /// </summary>
    public Uri? GetBaseUri() =>
        BuildUrl("/") is { } url && Uri.TryCreate(url, UriKind.Absolute, out var uri) ? uri : null;
}