using CliFx.Attributes;
using CliFx.Infrastructure;
using ZB.MOM.WW.OtOpcUa.Driver.Cli.Common;

namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Cli.Commands;

/// <summary>
///     Probes an AB CIP gateway: initialises the driver (connects via libplctag), reads a
///     single tag, and prints health + the read result. Fastest way to answer "is the PLC
///     up + reachable + speaking CIP via this path?".
/// </summary>
[Command("probe", Description = "Verify the AB CIP gateway is reachable and a sample tag reads.")]
public sealed class ProbeCommand : AbCipCommandBase
{
    /// <summary>Gets the tag path to probe.</summary>
    [CommandOption("tag", 't', Description =
        "Tag path to probe. ControlLogix default is '@raw_cpu_type' (the canonical libplctag " +
        "system tag); Micro800 takes a user-supplied global (e.g. '_SYSVA_CLOCK_HOUR').",
        IsRequired = true)]
    public string TagPath { get; init; } = default!;

    /// <summary>Gets the data type of the probe tag.</summary>
    [CommandOption("type", Description =
        "Logix atomic type of the probe tag (default DInt).")]
    public AbCipDataType DataType { get; init; } = AbCipDataType.DInt;

    /// <inheritdoc />
    public override async ValueTask ExecuteAsync(IConsole console)
    {
        ConfigureLogging();
        RejectStructure(DataType);
        var ct = console.RegisterCancellationHandler();

        var probeTag = new AbCipTagDefinition(
            Name: "__probe",
            DeviceHostAddress: Gateway,
            TagPath: TagPath,
            DataType: DataType,
            Writable: false);
        var options = BuildOptions([probeTag]);

        await using var driver = new AbCipDriver(options, DriverInstanceId);
        try
        {
            await driver.InitializeAsync("{}", ct);
            var snapshot = await driver.ReadAsync(["__probe"], ct);
            var health = driver.GetHealth();

            await console.Output.WriteLineAsync($"Gateway:      {Gateway}");
            await console.Output.WriteLineAsync($"Family:       {Family}");
            await console.Output.WriteLineAsync($"Health:       {health.State}");
            if (health.LastError is { } err)
                await console.Output.WriteLineAsync($"Last error:   {err}");
            await console.Output.WriteLineAsync();
            await console.Output.WriteLineAsync(SnapshotFormatter.Format(TagPath, snapshot[0]));
        }
        finally
        {
            await driver.ShutdownAsync(CancellationToken.None);
            // Flush Serilog before process exit so buffered log output emitted during
            // driver shutdown is not lost.
            FlushLogging();
        }
    }
}
