lmxopcua/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway/GatewayHistorianServiceCollectionExtensions.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
using ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian;
using ZB.MOM.WW.OtOpcUa.Runtime.Historian;

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway;

/// <summary>
///     Host-callable factories that build the gateway-backed historian seams against the single
///     <c>ServerHistorian</c> gateway: <see cref="CreateDataSource"/> for the read path (the Host's
///     <c>AddServerHistorian</c> wiring) and <see cref="CreateAlarmWriter"/> for the alarm-write path
///     (the Host's <c>AddAlarmHistorian</c> wiring). Both keep the concrete package-client dependency
///     inside this driver project — the Host references only the driver, not the package client directly.
/// </summary>
public static class GatewayHistorian
{
    /// <summary>
    ///     Builds a <see cref="GatewayHistorianDataSource"/> over a lazily connected
    ///     <see cref="HistorianGatewayClientAdapter"/> mapped from the bound
    ///     <see cref="ServerHistorianOptions"/>. Resolves an <see cref="ILoggerFactory"/> and the data
    ///     source's <see cref="ILogger{TCategoryName}"/> from <paramref name="services"/>, falling back to
    ///     the null implementations when absent (e.g. minimal test providers). Performs no network I/O —
    ///     the underlying channel dials on first use.
    /// </summary>
    /// <param name="options">The bound <c>ServerHistorian</c> configuration.</param>
    /// <param name="services">The resolving service provider (used only to locate logging services).</param>
    /// <returns>The gateway-backed <see cref="IHistorianDataSource"/>.</returns>
    public static IHistorianDataSource CreateDataSource(ServerHistorianOptions options, IServiceProvider services)
    {
        ArgumentNullException.ThrowIfNull(options);
        ArgumentNullException.ThrowIfNull(services);

        var loggerFactory = services.GetService<ILoggerFactory>() ?? NullLoggerFactory.Instance;
        var logger = services.GetService<ILogger<GatewayHistorianDataSource>>()
            ?? NullLogger<GatewayHistorianDataSource>.Instance;

        return new GatewayHistorianDataSource(
            HistorianGatewayClientAdapter.Create(options, loggerFactory),
            logger);
    }

    /// <summary>
    ///     Builds a <see cref="GatewayAlarmHistorianWriter"/> over a lazily connected
    ///     <see cref="HistorianGatewayClientAdapter"/> mapped from the bound
    ///     <see cref="ServerHistorianOptions"/> — the <b>same single gateway</b> the read path
    ///     (<see cref="CreateDataSource"/>) targets. The Host's <c>AddAlarmHistorian</c> wiring supplies
    ///     this as the concrete <see cref="IAlarmHistorianWriter"/> the durable
    ///     <c>SqliteStoreAndForwardSink</c> drain worker delegates to, sourcing the connection from the
    ///     <c>ServerHistorian</c> section (endpoint/key/TLS) rather than the legacy Wonderware-shaped
    ///     <c>AlarmHistorian</c> host/port. Resolves an <see cref="ILoggerFactory"/> and the writer's
    ///     <see cref="ILogger{TCategoryName}"/> from <paramref name="services"/>, falling back to the null
    ///     implementations when absent. Performs no network I/O — the underlying channel dials on first send.
    /// </summary>
    /// <remarks>
    ///     This deliberately constructs its <b>own</b> <see cref="HistorianGatewayClientAdapter"/> — a
    ///     second gRPC channel to the same gateway as the read path. Collapsing the two onto one shared
    ///     channel would require the container to own a singleton <see cref="IHistorianGatewayClient"/> and
    ///     the read-side <see cref="GatewayHistorianDataSource"/> to stop owning + disposing its client,
    ///     regressing the read cutover's dispose ownership (and its tests). A second channel to a co-located
    ///     sidecar is cheap — the gateway pools and amortizes the underlying historian sessions server-side —
    ///     so each path keeps its own channel with a clean, independent lifetime.
    /// </remarks>
    /// <param name="options">The bound <c>ServerHistorian</c> configuration (endpoint, key, TLS posture).</param>
    /// <param name="services">The resolving service provider (used only to locate logging services).</param>
    /// <returns>The gateway-backed <see cref="IAlarmHistorianWriter"/>.</returns>
    public static IAlarmHistorianWriter CreateAlarmWriter(ServerHistorianOptions options, IServiceProvider services)
    {
        ArgumentNullException.ThrowIfNull(options);
        ArgumentNullException.ThrowIfNull(services);

        var loggerFactory = services.GetService<ILoggerFactory>() ?? NullLoggerFactory.Instance;
        var logger = services.GetService<ILogger<GatewayAlarmHistorianWriter>>()
            ?? NullLogger<GatewayAlarmHistorianWriter>.Instance;

        return new GatewayAlarmHistorianWriter(
            HistorianGatewayClientAdapter.Create(options, loggerFactory),
            logger);
    }
}