using StellaOps.Findings.Ledger.Infrastructure.Exports;
using Xunit;

namespace StellaOps.Findings.Ledger.Tests.Exports;

public class ExportPagingTests
{
    [Fact]
    public void ComputeFiltersHash_IsDeterministic()
    {
        var left = new Dictionary<string, string?>
        {
            ["shape"] = "canonical",
            ["since_sequence"] = "10",
            ["until_sequence"] = "20"
        };

        var right = new Dictionary<string, string?>
        {
            ["until_sequence"] = "20",
            ["shape"] = "canonical",
            ["since_sequence"] = "10"
        };

        var leftHash = ExportPaging.ComputeFiltersHash(left);
        var rightHash = ExportPaging.ComputeFiltersHash(right);

        Assert.Equal(leftHash, rightHash);
    }

    [Fact]
    public void PageToken_RoundTrips()
    {
        var key = new ExportPaging.ExportPageKey(5, "v1", "abc123");
        var filtersHash = ExportPaging.ComputeFiltersHash(new Dictionary<string, string?>
        {
            ["shape"] = "canonical"
        });

        var token = ExportPaging.CreatePageToken(key, filtersHash);

        var parsed = ExportPaging.TryParsePageToken(token, filtersHash, out var recovered, out var error);

        Assert.True(parsed);
        Assert.Null(error);
        Assert.NotNull(recovered);
        Assert.Equal(key.SequenceNumber, recovered!.SequenceNumber);
        Assert.Equal(key.PolicyVersion, recovered.PolicyVersion);
        Assert.Equal(key.CycleHash, recovered.CycleHash);
    }
}