import { emitDiagnosticEvent } from "../infra/diagnostic-events.js";
import { createSubsystemLogger } from "./subsystem.js";

const diag = createSubsystemLogger("diagnostic");
let lastActivityAt = 0;

export const diagnosticLogger = diag;

export function markDiagnosticActivity(): void {
  lastActivityAt = Date.now();
}

export function getLastDiagnosticActivityAt(): number {
  return lastActivityAt;
}

export function resetDiagnosticActivityForTest(): void {
  lastActivityAt = 0;
}

export function logLaneEnqueue(lane: string, queueSize: number): void {
  diag.debug(`lane enqueue: lane=${lane} queueSize=${queueSize}`);
  emitDiagnosticEvent({
    type: "queue.lane.enqueue",
    lane,
    queueSize,
  });
  markDiagnosticActivity();
}

export function logLaneDequeue(lane: string, waitMs: number, queueSize: number): void {
  diag.debug(`lane dequeue: lane=${lane} waitMs=${waitMs} queueSize=${queueSize}`);
  emitDiagnosticEvent({
    type: "queue.lane.dequeue",
    lane,
    queueSize,
    waitMs,
  });
  markDiagnosticActivity();
}