using ItWorx.KnowledgeHub.Domain.Sources;

namespace ItWorx.KnowledgeHub.Domain.Tests.Sources;

public sealed class DataSourceTests
{
    private static readonly DateTimeOffset Now = new(2026, 10, 2, 0, 0, 0, TimeSpan.Zero);

    [Fact]
    public void A_registered_source_is_unknown_until_it_has_observed_evidence()
    {
        var source = DataSource.Create(Guid.NewGuid(), "inventory:test", "Inventory", DataSourceKind.Inventory, 24, Now);
        Assert.Equal("Unknown", source.GetState(Now));
        Assert.Null(source.LastSuccessAt);
        Assert.Null(source.RecordCount);
    }

    [Fact]
    public void Newer_failure_outweighs_earlier_success_and_stale_success_is_not_current()
    {
        var source = DataSource.Create(Guid.NewGuid(), "inventory:test", "Inventory", DataSourceKind.Inventory, 24, Now);
        source.Observe(true, 12, null, "run1", Now);
        Assert.Equal("Current", source.GetState(Now));
        Assert.Equal("Stale", source.GetState(Now.AddHours(25)));
        source.Observe(false, null, "connectivity", "run2", Now.AddHours(1));
        Assert.Equal("Failed", source.GetState(Now.AddHours(1)));
        Assert.Equal(12, source.RecordCount);
        Assert.Throws<ArgumentException>(() => source.Observe(true, 99, null, "older", Now.AddMinutes(-1)));
    }

    [Fact]
    public void Importing_old_data_does_not_refresh_its_freshness()
    {
        var source = DataSource.Create(Guid.NewGuid(), "inventory:test", "Inventory", DataSourceKind.Inventory, 24, Now);
        source.Observe(true, 12, null, "import", Now, Now.AddDays(-2));
        Assert.Equal("Stale", source.GetState(Now));
        Assert.Equal(Now, source.LastSuccessAt);
    }

    [Fact]
    public void Disabling_preserves_prior_evidence_and_observations_require_safe_error_codes()
    {
        var source = DataSource.Create(Guid.NewGuid(), "inventory:test", "Inventory", DataSourceKind.Inventory, 24, Now);
        source.Observe(true, 12, null, "run1", Now);
        source.Configure("Inventory", false, 24);
        Assert.Equal("Disabled", source.GetState(Now));
        Assert.Equal(Now, source.LastSuccessAt);
        Assert.Throws<ArgumentException>(() => source.Observe(false, null, "secret connection string", "run2", Now));
    }
}