/**
 * apps/worker — structured logging (pino).
 *
 * `getLogger(module)` returns a child logger bound to a module name so every
 * line carries context (`mod` field) without manual tagging. In development
 * the pretty transport is used; in production plain JSON (one line per event)
 * for log shippers.
 */
import pino, { type Logger } from "pino";

const isDev =
  (typeof process.env.NODE_ENV === "undefined" ? "development" : process.env.NODE_ENV) !==
  "production";

const base = pino({
  level: process.env.LOG_LEVEL ?? (isDev ? "debug" : "info"),
  base: { svc: "factory-worker" },
  timestamp: pino.stdTimeFunctions.isoTime,
  ...(isDev
    ? {
        transport: {
          target: "pino-pretty",
          options: {
            colorize: true,
            translateTime: "SYS:HH:MM:ss",
            ignore: "pid,hostname,svc"
          }
        }
      }
    : {})
});

const children = new Map<string, Logger>();

/** Get (or create) a child logger for a module/processor name. */
export function getLogger(module: string): Logger {
  let child = children.get(module);
  if (!child) {
    child = base.child({ mod: module });
    children.set(module, child);
  }
  return child;
}

export type { Logger };