using MxGateway.Contracts.Proto;
using MxGateway.Server.Sessions;

namespace MxGateway.Tests.Gateway.Sessions;

/// <summary>
///     PR A.6 / A.7 — pins the not-yet-wired dispatcher's behaviour:
///     AcknowledgeAsync returns OK with a worker-pending diagnostic and
///     QueryActiveAlarmsAsync yields an empty stream. Production
///     <c>WorkerAlarmRpcDispatcher</c> (dev-rig follow-up) replaces this
///     impl in DI without changing the gateway handler shape.
/// </summary>
public sealed class NotWiredAlarmRpcDispatcherTests
{
    [Fact]
    public async Task AcknowledgeAsync_WhenNotWired_ReturnsOkWithWorkerPendingDiagnostic()
    {
        IAlarmRpcDispatcher dispatcher = new NotWiredAlarmRpcDispatcher();

        AcknowledgeAlarmReply reply = await dispatcher.AcknowledgeAsync(
            new AcknowledgeAlarmRequest
            {
                SessionId = "session-1",
                ClientCorrelationId = "corr-1",
                AlarmFullReference = "Tank01.Level.HiHi",
                Comment = "investigating",
                OperatorUser = "alice",
            },
            CancellationToken.None);

        Assert.Equal(ProtocolStatusCode.Ok, reply.ProtocolStatus.Code);
        Assert.Equal("session-1", reply.SessionId);
        Assert.Equal("corr-1", reply.CorrelationId);
        Assert.Contains("worker", reply.DiagnosticMessage, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task QueryActiveAlarmsAsync_WhenNotWired_YieldsNoSnapshots()
    {
        IAlarmRpcDispatcher dispatcher = new NotWiredAlarmRpcDispatcher();

        int count = 0;
        await foreach (ActiveAlarmSnapshot _ in dispatcher.QueryActiveAlarmsAsync(
            new QueryActiveAlarmsRequest { SessionId = "session-1" },
            CancellationToken.None))
        {
            count++;
        }

        Assert.Equal(0, count);
    }
}