using System.Text;
using StellaOps.TestKit;
using Xunit;

namespace StellaOps.Canonical.Json.Tests;

public partial class CanonVersionTests
{
    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public void CanonicalizeVersioned_IncludesVersionMarker()
    {
        var obj = new { foo = "bar" };
        var canonical = CanonJson.CanonicalizeVersioned(obj);
        var json = Encoding.UTF8.GetString(canonical);

        Assert.StartsWith("{\"_canonVersion\":\"stella:canon:v1\"", json);
        Assert.Contains("\"foo\":\"bar\"", json);
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public void CanonicalizeVersioned_VersionMarkerIsFirst()
    {
        var obj = new { aaa = 1, zzz = 2 };
        var canonical = CanonJson.CanonicalizeVersioned(obj);
        var json = Encoding.UTF8.GetString(canonical);

        var versionIndex = json.IndexOf("_canonVersion", StringComparison.Ordinal);
        var aaaIndex = json.IndexOf("aaa", StringComparison.Ordinal);
        Assert.True(versionIndex < aaaIndex);
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public void CanonicalizeVersioned_SortsOtherKeys()
    {
        var obj = new { z = 3, a = 1, m = 2 };
        var canonical = CanonJson.CanonicalizeVersioned(obj);
        var json = Encoding.UTF8.GetString(canonical);

        Assert.Matches(@"\{""_canonVersion"":""[^""]+"",""a"":1,""m"":2,""z"":3\}", json);
    }
}