using Akka.Actor;
using Akka.Event;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.RemoteQuery;

namespace ZB.MOM.WW.ScadaBridge.SiteEventLogging;

/// <summary>
/// Akka actor bridge for <see cref="IEventLogQueryService"/>.
/// Receives <see cref="EventLogQueryRequest"/> from the SiteCommunicationActor
/// and returns <see cref="EventLogQueryResponse"/>.
/// </summary>
public class EventLogHandlerActor : ReceiveActor
{
    private readonly ILoggingAdapter _log = Context.GetLogger();
    private readonly IEventLogQueryService _queryService;

    /// <summary>Initializes the actor and registers the <see cref="EventLogQueryRequest"/> handler.</summary>
    /// <param name="queryService">The query service that executes event log queries.</param>
    public EventLogHandlerActor(IEventLogQueryService queryService)
    {
        _queryService = queryService;

        // The query is synchronous SQLite I/O (a keyword search can scan millions of
        // rows), so run it on the thread pool and pipe the reply back rather than pinning
        // an Akka dispatcher thread (review 2026-10-21 02/P1). ExecuteQuery never throws —
        // it returns Success:false — so no failure mapper is needed beyond the safety net.
        Receive<EventLogQueryRequest>(msg =>
        {
            var service = _queryService;
            Task.Run(() => service.ExecuteQuery(msg)).PipeTo(Sender);
        });
    }
}