using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;

/// <summary>
///     Scaffold tests for the reconnect options. Since Gitea #670 the driver has no in-driver reconnect
///     handler (session loss is reported and the host's comms-loss watchdog re-initialises the driver);
///     <c>ReconnectPeriod</c> is retained for config compatibility only. Outage behaviour is covered by
///     <see cref="OpcUaClientSessionLossTests"/> and, over the wire, <c>OpcUaClientDriverReconnectWireTests</c>.
/// </summary>
[Trait("Category", "Unit")]
public sealed class OpcUaClientReconnectTests
{
    /// <summary>Verifies that the default reconnect period matches the driver specification of 5 seconds.</summary>
    [Fact]
    public void Default_ReconnectPeriod_matches_driver_specs_5_seconds()
    {
        new OpcUaClientDriverOptions().ReconnectPeriod.ShouldBe(TimeSpan.FromSeconds(5));
    }

    /// <summary>Verifies that reconnect period can be configured for aggressive or relaxed retries.</summary>
    [Fact]
    public void Options_ReconnectPeriod_is_configurable_for_aggressive_or_relaxed_retry()
    {
        var opts = new OpcUaClientDriverOptions { ReconnectPeriod = TimeSpan.FromMilliseconds(500) };
        opts.ReconnectPeriod.ShouldBe(TimeSpan.FromMilliseconds(500));
    }

    /// <summary>Verifies that the driver starts in the Unknown state before initialization.</summary>
    [Fact]
    public void Driver_starts_unknown_pre_init()
    {
        using var drv = new OpcUaClientDriver(new OpcUaClientDriverOptions(), "opcua-reconnect");
        drv.GetHealth().State.ShouldBe(Core.Abstractions.DriverState.Unknown);
    }
}