using KArtSell.Modules.ModelOperations.Domain;
namespace KArtSell.ModelOperations.UnitTests;
public sealed class ModelOperationExecutionTests
{
    [Fact] public void Business_hold_can_resume_but_success_is_terminal()
    {
        var now = DateTimeOffset.UtcNow;
        var execution = new ModelOperationExecution(Guid.NewGuid(), "J32:KR:1", now);
        execution.MoveTo(ModelOperationExecutionState.BusinessHold, "PIT_NOT_READY", "h1", now, now.AddMinutes(5));
        execution.MoveTo(ModelOperationExecutionState.Running, "DATA_READY", "h2", now.AddMinutes(1));
        execution.MoveTo(ModelOperationExecutionState.Succeeded, "OUTPUT_FROZEN", "h3", now.AddMinutes(2));
        Assert.Throws<InvalidOperationException>(() => execution.MoveTo(ModelOperationExecutionState.Running, "REOPEN", "h4", now.AddMinutes(3)));
    }

    [Fact]
    public void Business_hold_requires_a_future_expiry_but_technical_failure_cannot_set_one()
    {
        var now = new DateTimeOffset(2026, 8, 9, 0, 0, 0, TimeSpan.Zero);
        var execution = new ModelOperationExecution(Guid.NewGuid(), "key", now);

        Assert.Throws<InvalidOperationException>(() => execution.MoveTo(ModelOperationExecutionState.BusinessHold, "PIT_GAP", "h1", now));

        execution.MoveTo(ModelOperationExecutionState.Running, "STARTED", "h2", now.AddMinutes(1));
        Assert.Throws<InvalidOperationException>(() => execution.MoveTo(ModelOperationExecutionState.Failed, "NETWORK_TIMEOUT", "h3", now.AddMinutes(2), now.AddMinutes(3)));
    }

    [Fact]
    public void Business_hold_persists_reason_and_expiry_until_an_explicit_resume()
    {
        var now = new DateTimeOffset(2026, 8, 9, 0, 0, 0, TimeSpan.Zero);
        var holdUntil = now.AddHours(1);
        var execution = new ModelOperationExecution(Guid.NewGuid(), "key", now);

        var transition = execution.MoveTo(ModelOperationExecutionState.BusinessHold, "CALENDAR_NOT_APPROVED", "h1", now.AddMinutes(1), holdUntil);

        Assert.Equal("CALENDAR_NOT_APPROVED", transition.ReasonCode);
        Assert.Equal(holdUntil, transition.HoldUntil);
        Assert.Equal(holdUntil, execution.HoldUntil);

        execution.MoveTo(ModelOperationExecutionState.Running, "CALENDAR_APPROVED", "h2", holdUntil);
        Assert.Null(execution.HoldUntil);
    }

    [Fact]
    public void Running_execution_records_monotonic_heartbeats_and_uses_the_caller_cutoff()
    {
        var now = new DateTimeOffset(2026, 8, 9, 0, 0, 0, TimeSpan.Zero);
        var execution = new ModelOperationExecution(Guid.NewGuid(), "key", now);
        execution.MoveTo(ModelOperationExecutionState.Running, "STARTED", "h1", now);
        execution.RecordHeartbeat(now.AddMinutes(2));

        Assert.False(execution.HasExceededHeartbeatCutoff(now.AddMinutes(6), TimeSpan.FromMinutes(5)));
        Assert.True(execution.HasExceededHeartbeatCutoff(now.AddMinutes(8), TimeSpan.FromMinutes(5)));
        Assert.Throws<InvalidOperationException>(() => execution.RecordHeartbeat(now.AddMinutes(1)));
    }

    [Fact]
    public void Non_running_execution_cannot_record_a_heartbeat()
    {
        var now = new DateTimeOffset(2026, 8, 9, 0, 0, 0, TimeSpan.Zero);
        var execution = new ModelOperationExecution(Guid.NewGuid(), "key", now);

        Assert.Throws<InvalidOperationException>(() => execution.RecordHeartbeat(now));
    }
}