using PrivaPub.Federation.Rendering;

using System.Text.Json.Nodes;

namespace PrivaPub.Tests.Federation
{
	// The @context on everything we send. Readers that expand JSON-LD 1.0 (Smithereen) refuse a whole document over one
	// term only 1.1 knows, so every term stays within 1.0
	public class ContextTests
	{
		static readonly string[] Containers10 = ["@list", "@set", "@index", "@language"];
		static readonly string[] Keywords11 = ["@version", "@protected", "@propagate", "@import", "@nest", "@prefix", "@context", "@direction", "@json"];

		[Fact]
		public void Every_term_is_json_ld_1_0()
		{
			var terms = ActivityPubRenderer.Context().OfType<JsonObject>().Single();

			foreach (var (name, definition) in terms)
			{
				if (definition is not JsonObject term)
					continue;
				if (term["@container"] is JsonValue container)
					Assert.True(Containers10.Contains(container.GetValue<string>()), $"{name}: @container {container} is JSON-LD 1.1");
				Assert.True(term["@container"] is null or JsonValue, $"{name}: an array of containers is JSON-LD 1.1");
				Assert.DoesNotContain(term.Select(p => p.Key), Keywords11.Contains);
				Assert.NotEqual("@json", term["@type"]?.GetValue<string>());
			}
			Assert.DoesNotContain(terms.Select(p => p.Key), Keywords11.Contains);
		}
	}
}