using Microsoft.AspNetCore.SignalR;

namespace WiSL.EndPoints.Hubs;

// Real-time push for WI Line Digital Twin / Plant Overview / Workstation Display Screen.
// 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 (line/workstation groups
// are pure "what am I watching," same tenant-scoping the underlying REST endpoints already enforce
// on every fetch) — unlike CollabHub, this hub does not reconstruct or use LoginDTO at all.
public class WiHub(ILogger<WiHub> logger) : Hub<IWiHubClient>
{
    public override async Task OnConnectedAsync()
    {
        logger.LogInformation("WiHub connected: {ConnectionId}", Context.ConnectionId);
        await base.OnConnectedAsync();
    }

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

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

    public Task JoinLineGroup(int productionLineId)
        => Groups.AddToGroupAsync(Context.ConnectionId, LineGroup(productionLineId));

    public Task LeaveLineGroup(int productionLineId)
        => Groups.RemoveFromGroupAsync(Context.ConnectionId, LineGroup(productionLineId));

    public Task JoinWorkstationGroup(int workStationId)
        => Groups.AddToGroupAsync(Context.ConnectionId, WorkstationGroup(workStationId));

    public Task LeaveWorkstationGroup(int workStationId)
        => Groups.RemoveFromGroupAsync(Context.ConnectionId, WorkstationGroup(workStationId));

    // ── Group naming ────────────────────────────────────────────────────
    public static string LineGroup(int productionLineId) => $"wi:line:{productionLineId}";
    public static string WorkstationGroup(int workStationId) => $"wi:workstation:{workStationId}";
}