using ZB.MOM.WW.ScadaBridge.Commons.Messages.InboundApi;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Audit;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Debugging;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
using ZB.MOM.WW.ScadaBridge.Communication.Grpc;

namespace ZB.MOM.WW.ScadaBridge.Communication.Tests;

/// <summary>
/// Flow Debugger (design 2026-09-05 §5.2/§5.4): the site_command.proto trace fields — the
/// <c>trace</c> flag on both route requests, and <c>child_execution_id</c> +
/// <c>trace_events</c> on the call response — round-trip through
/// <see cref="SiteCommandDtoMapper"/>, and an old-shape DTO (no fields set) maps to the
/// untraced defaults.
/// </summary>
public class SiteCommandDtoMapperTraceTests
{
    private static readonly DateTimeOffset T = new(2026, 9, 5, 12, 0, 0, TimeSpan.Zero);

    [Fact]
    public void RouteToCallResponse_RoundTrips_ChildExecutionId_AndTraceEvents()
    {
        var child = Guid.NewGuid();
        var run = ScadaBridgeAuditEventFactory.Create(AuditChannel.ScriptTrace, AuditKind.ScriptRun, AuditStatus.Delivered,
            occurredAtUtc: T.UtcDateTime, actor: "ScriptActor:S", target: "S", sourceNode: "node-b",
            executionId: child, parentExecutionId: Guid.NewGuid(), sourceSiteId: "site-a", durationMs: 40,
            requestSummary: "{\"x\":1}", responseSummary: "\"ok\"",
            extra: new ScriptTraceExtra { TriggerKind = "call" }.ToJson());
        var write = ScadaBridgeAuditEventFactory.Create(AuditChannel.ScriptTrace, AuditKind.AttributeWrite, AuditStatus.Delivered,
            occurredAtUtc: T.UtcDateTime.AddMilliseconds(5), actor: "ScriptActor:S", target: "A", executionId: child,
            extra: new ScriptTraceExtra { Writes = [new AttributeWriteDetail("A", "1", true, null)] }.ToJson());
        var original = new RouteToCallResponse("c", true, 7L, null, T, child, [run, write]);

        var restored = SiteCommandDtoMapper.FromProto(SiteCommandDtoMapper.ToProto(original));

        Assert.Equal(child, restored.ChildExecutionId);
        Assert.NotNull(restored.TraceEvents);
        Assert.Equal(2, restored.TraceEvents!.Count);
        Assert.Equal(run.Action, restored.TraceEvents[0].Action);
        Assert.Equal(run.DetailsJson, restored.TraceEvents[0].DetailsJson);
        Assert.Equal(write.EventId, restored.TraceEvents[1].EventId);
        Assert.Equal(original, restored with { TraceEvents = original.TraceEvents });
        Assert.Equal(run, restored.TraceEvents[0]);
    }

    [Fact]
    public void OldShapeDtos_MapToUntracedDefaults()
    {
        // A DTO from a site/central that predates the fields: proto3 defaults everywhere.
        var call = SiteCommandDtoMapper.FromProto(new RouteToCallRequestDto
        {
            CorrelationId = "c", InstanceUniqueName = "i", ScriptName = "s",
            Timestamp = Google.Protobuf.WellKnownTypes.Timestamp.FromDateTimeOffset(T),
        });
        Assert.False(call.Trace);

        var set = SiteCommandDtoMapper.FromProto(new RouteToSetAttributesRequestDto
        {
            CorrelationId = "c", InstanceUniqueName = "i",
            Timestamp = Google.Protobuf.WellKnownTypes.Timestamp.FromDateTimeOffset(T),
        });
        Assert.False(set.Trace);

        var reply = SiteCommandDtoMapper.FromProto(new RouteToCallResponseDto
        {
            CorrelationId = "c", Success = true,
            Timestamp = Google.Protobuf.WellKnownTypes.Timestamp.FromDateTimeOffset(T),
        });
        Assert.Null(reply.ChildExecutionId);
        Assert.Null(reply.TraceEvents);
    }

    [Fact]
    public void TraceFlag_PropagatesOnBothRequests()
    {
        var call = new RouteToCallRequest("c", "i", "s", null, T, Guid.NewGuid(), Trace: true);
        Assert.True(SiteCommandDtoMapper.ToProto(call).Trace);
        Assert.True(SiteCommandDtoMapper.FromProto(SiteCommandDtoMapper.ToProto(call)).Trace);

        var set = new RouteToSetAttributesRequest("c", "i", new Dictionary<string, string> { ["a"] = "1" }, T, Guid.NewGuid(), Trace: true);
        Assert.True(SiteCommandDtoMapper.ToProto(set).Trace);
        Assert.True(SiteCommandDtoMapper.FromProto(SiteCommandDtoMapper.ToProto(set)).Trace);
    }

    [Fact]
    public void EmptyTraceEventsList_MapsToNull_NotEmpty()
    {
        // An untraced run sends none; the CLR side distinguishes "none" (null) so the UI can
        // label the site lane — an empty list would read as "traced, did nothing".
        var original = new RouteToCallResponse("c", true, null, null, T, Guid.NewGuid(), Array.Empty<ZB.MOM.WW.Audit.AuditEvent>());
        var restored = SiteCommandDtoMapper.FromProto(SiteCommandDtoMapper.ToProto(original));
        Assert.Null(restored.TraceEvents);
        Assert.Equal(original.ChildExecutionId, restored.ChildExecutionId);
    }
}