using Microsoft.Extensions.Logging;
using MxGateway.Client;
using MxGateway.Contracts.Proto;

namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Runtime;

/// <summary>
///     Production <see cref="IGalaxyAlarmAcknowledger"/> backed by the
///     <c>MxGatewayClient.AcknowledgeAlarmAsync</c> RPC (PR E.2). Maps the
///     reply's protocol status into a thrown exception when the gateway
///     reports a non-OK condition; native MxStatus failures inside the reply
///     surface as a logged warning so operator workflows aren't blocked by a
///     transient MxAccess hiccup.
/// </summary>
internal sealed class GatewayGalaxyAlarmAcknowledger : IGalaxyAlarmAcknowledger
{
    private readonly MxGatewayClient _client;
    private readonly GalaxyMxSession _session;
    private readonly ILogger _logger;

    public GatewayGalaxyAlarmAcknowledger(
        MxGatewayClient client,
        GalaxyMxSession session,
        ILogger logger)
    {
        _client = client ?? throw new ArgumentNullException(nameof(client));
        _session = session ?? throw new ArgumentNullException(nameof(session));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public async Task AcknowledgeAsync(
        string alarmFullReference,
        string comment,
        string operatorUser,
        CancellationToken cancellationToken)
    {
        ArgumentException.ThrowIfNullOrEmpty(alarmFullReference);

        var session = _session.Session
            ?? throw new InvalidOperationException(
                "GatewayGalaxyAlarmAcknowledger requires a connected GalaxyMxSession; underlying gateway session is null.");
        var sessionId = session.SessionId;

        var reply = await _client.AcknowledgeAlarmAsync(
            new AcknowledgeAlarmRequest
            {
                SessionId = sessionId,
                ClientCorrelationId = Guid.NewGuid().ToString("N"),
                AlarmFullReference = alarmFullReference,
                Comment = comment ?? string.Empty,
                OperatorUser = operatorUser ?? string.Empty,
            },
            cancellationToken).ConfigureAwait(false);

        if (reply.Status is { Success: 0 } status)
        {
            // Native MxAccess rejected the ack — log but don't throw. Treat as a
            // best-effort operator workflow; the operator can retry via the OPC UA
            // session if necessary.
            _logger.LogWarning(
                "Galaxy AcknowledgeAlarm for {AlarmRef} returned MxStatus failure: category={Category} detail={Detail} text={Text}",
                alarmFullReference, status.Category, status.Detail, status.DiagnosticText);
        }
    }
}