using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Logging;

namespace FinlyticBackend.Hubs;

/// <summary>
/// SignalR Hub that streams live log messages from microservices to connected web UI clients.
/// </summary>
public class LogStreamHub : Hub
{
    private readonly ILogger<LogStreamHub> _logger;

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

    public async Task JoinServiceLogs(string serviceName)
    {
        if (!string.IsNullOrWhiteSpace(serviceName))
        {
            await Groups.AddToGroupAsync(Context.ConnectionId, serviceName);
            _logger.LogInformation("[LogStreamHub] Client {ConnectionId} joined log stream for {ServiceName}", Context.ConnectionId, serviceName);
        }
    }

    public async Task LeaveServiceLogs(string serviceName)
    {
        if (!string.IsNullOrWhiteSpace(serviceName))
        {
            await Groups.RemoveFromGroupAsync(Context.ConnectionId, serviceName);
            _logger.LogInformation("[LogStreamHub] Client {ConnectionId} left log stream for {ServiceName}", Context.ConnectionId, serviceName);
        }
    }

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

    public override async Task OnDisconnectedAsync(Exception? exception)
    {
        _logger.LogInformation("[LogStreamHub] Client disconnected: {ConnectionId}", Context.ConnectionId);
        await base.OnDisconnectedAsync(exception);
    }
}