using ZB.MOM.WW.ScadaBridge.Commons.Messages.DebugView;
using ZB.MOM.WW.ScadaBridge.Communication;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Services;

/// <summary>
/// Default <see cref="IInstanceSnapshotClient"/> — a thin facade over the
/// existing single-shot
/// <see cref="CommunicationService.RequestDebugSnapshotAsync"/> Ask (the same
/// Deployer-gated snapshot path the CLI <c>debug snapshot</c> command and the
/// Debug View use). Each call issues one <see cref="DebugSnapshotRequest"/>
/// with a fresh correlation id.
/// </summary>
public sealed class CommunicationInstanceSnapshotClient : IInstanceSnapshotClient
{
    private readonly CommunicationService _communication;

    /// <summary>
    /// Initializes a new instance of the <see cref="CommunicationInstanceSnapshotClient"/> class.
    /// </summary>
    /// <param name="communication">Central-side cluster communication service.</param>
    public CommunicationInstanceSnapshotClient(CommunicationService communication)
    {
        _communication = communication ?? throw new ArgumentNullException(nameof(communication));
    }

    /// <inheritdoc/>
    public Task<DebugViewSnapshot> GetSnapshotAsync(
        string siteIdentifier,
        string instanceUniqueName,
        CancellationToken cancellationToken = default)
    {
        var request = new DebugSnapshotRequest(instanceUniqueName, Guid.NewGuid().ToString("N"));
        return _communication.RequestDebugSnapshotAsync(siteIdentifier, request, cancellationToken);
    }
}