using Microsoft.AspNetCore.SignalR;

namespace SkillManagementSL.EndPoints.Hubs;

// Real-time push for the Skill Matrix and Employee Skill Profile screens — closes the
// "no real-time push" gap noted in the Skill Management feature guide (previously fast-refresh/
// on-demand only). Hub is transient; no mutable state stored in instance fields. LoginDTO trust
// model isn't needed here since group membership carries no identity/authorization semantics
// (employee/tenant groups are pure "what am I watching," same tenant-scoping the underlying REST
// endpoints already enforce on every fetch) — mirrors WiSL.EndPoints.Hubs.WiHub exactly.
public class SkillHub(ILogger<SkillHub> logger) : Hub<ISkillHubClient>
{
    public override async Task OnConnectedAsync()
    {
        logger.LogInformation("SkillHub connected: {ConnectionId}", Context.ConnectionId);
        await base.OnConnectedAsync();
    }

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

    // ── Hub methods (client-callable) ──────────────────────────────────

    public Task JoinEmployeeGroup(int employeeId)
        => Groups.AddToGroupAsync(Context.ConnectionId, EmployeeGroup(employeeId));

    public Task LeaveEmployeeGroup(int employeeId)
        => Groups.RemoveFromGroupAsync(Context.ConnectionId, EmployeeGroup(employeeId));

    public Task JoinMatrixGroup(int clientId)
        => Groups.AddToGroupAsync(Context.ConnectionId, MatrixGroup(clientId));

    public Task LeaveMatrixGroup(int clientId)
        => Groups.RemoveFromGroupAsync(Context.ConnectionId, MatrixGroup(clientId));

    // ── Group naming ────────────────────────────────────────────────────
    public static string EmployeeGroup(int employeeId) => $"skill:employee:{employeeId}";
    public static string MatrixGroup(int clientId) => $"skill:matrix:{clientId}";
}