using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Opc.Ua;
using Opc.Ua.Server;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
using ZB.MOM.WW.OtOpcUa.Core.Hosting;
using ZB.MOM.WW.OtOpcUa.Core.OpcUa;

namespace ZB.MOM.WW.OtOpcUa.Server.OpcUa;

/// <summary>
///     <see cref="StandardServer"/> subclass that wires one <see cref="DriverNodeManager"/> per
///     registered driver from <see cref="DriverHost"/>. Anonymous endpoint on
///     <c>opc.tcp://0.0.0.0:4840</c>, no security — PR 16 minimum-viable scope; LDAP + security
///     profiles are deferred to their own PR on top of this.
/// </summary>
public sealed class OtOpcUaServer : StandardServer
{
    private readonly DriverHost _driverHost;
    private readonly ILoggerFactory _loggerFactory;
    private readonly List<DriverNodeManager> _driverNodeManagers = new();

    public OtOpcUaServer(DriverHost driverHost, ILoggerFactory loggerFactory)
    {
        _driverHost = driverHost;
        _loggerFactory = loggerFactory;
    }

    /// <summary>
    ///     Read-only snapshot of the driver node managers materialized at server start. Used by
    ///     the generic-driver-node-manager-driven discovery flow after the server starts — the
    ///     host walks each entry and invokes
    ///     <c>GenericDriverNodeManager.BuildAddressSpaceAsync(manager)</c> passing the manager
    ///     as its own <see cref="IAddressSpaceBuilder"/>.
    /// </summary>
    public IReadOnlyList<DriverNodeManager> DriverNodeManagers => _driverNodeManagers;

    protected override MasterNodeManager CreateMasterNodeManager(IServerInternal server, ApplicationConfiguration configuration)
    {
        foreach (var driverId in _driverHost.RegisteredDriverIds)
        {
            var driver = _driverHost.GetDriver(driverId);
            if (driver is null) continue;

            var logger = _loggerFactory.CreateLogger<DriverNodeManager>();
            var manager = new DriverNodeManager(server, configuration, driver, logger);
            _driverNodeManagers.Add(manager);
        }

        return new MasterNodeManager(server, configuration, null, _driverNodeManagers.ToArray());
    }

    protected override ServerProperties LoadServerProperties() => new()
    {
        ManufacturerName = "OtOpcUa",
        ProductName = "OtOpcUa.Server",
        ProductUri = "urn:OtOpcUa:Server",
        SoftwareVersion = "2.0.0",
        BuildNumber = "0",
        BuildDate = DateTime.UtcNow,
    };
}