using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Logging;

namespace EntitlementSL.Hubs;

// Real-time client-onboarding status push (tracker §37 Decision 2) — modeled directly on
// GB5Framework's FrameworkSL/Hubs/DataSync/DataSyncHub.cs (same group-per-subject pattern,
// same bare connection-lifecycle logging, no per-connection auth gate — this hub carries only
// onboarding-progress state, never a credential or PII). EntitlementSL's first-ever SignalR hub.
public class ProvisioningHub : Hub<IProvisioningClient>
{
    private readonly ILogger<ProvisioningHub> _logger;

    public ProvisioningHub(ILogger<ProvisioningHub> logger)
    {
        _logger = logger;
    }

    // ── Connection lifecycle ──────────────────────────────────────────────

    public override async Task OnConnectedAsync()
    {
        _logger.LogInformation("ProvisioningHub connected: {ConnectionId}", Context.ConnectionId);
        await base.OnConnectedAsync();
    }

    public override async Task OnDisconnectedAsync(Exception? exception)
    {
        _logger.LogInformation("ProvisioningHub disconnected: {ConnectionId}", Context.ConnectionId);
        if (exception is not null)
            _logger.LogWarning(exception, "ProvisioningHub disconnected with error: {ConnectionId}", Context.ConnectionId);
        await base.OnDisconnectedAsync(exception);
    }

    // ── Hub methods ───────────────────────────────────────────────────────

    // Client calls this to subscribe to progress for its own onboarding job.
    // Group name: "provisioning:{clientId}"
    public async Task JoinClientGroup(int clientId)
    {
        var group = ClientGroup(clientId);
        await Groups.AddToGroupAsync(Context.ConnectionId, group);
        _logger.LogInformation("Connection {ConnectionId} joined group {Group}", Context.ConnectionId, group);
    }

    public async Task LeaveClientGroup(int clientId)
    {
        await Groups.RemoveFromGroupAsync(Context.ConnectionId, ClientGroup(clientId));
    }

    // ── Helpers ───────────────────────────────────────────────────────────

    public static string ClientGroup(int clientId) => $"provisioning:{clientId}";
}