/** Structured logger with worker context */

type LogLevel = 'info' | 'warn' | 'error' | 'debug';

interface LogEntry {
  level: LogLevel;
  ts: string;
  worker?: string;
  job?: string;
  account?: string;
  step?: string;
  msg: string;
  [key: string]: unknown;
}

let globalWorkerId = 'unknown';

export function setWorkerId(id: string): void {
  globalWorkerId = id;
}

function write(level: LogLevel, msg: string, extra?: Record<string, unknown>): void {
  const entry: LogEntry = {
    level,
    ts: new Date().toISOString(),
    worker: globalWorkerId,
    msg,
    ...extra,
  };
  const line = JSON.stringify(entry);
  if (level === 'error') {
    process.stderr.write(line + '\n');
  } else {
    process.stdout.write(line + '\n');
  }
}

export const logger = {
  info: (msg: string, extra?: Record<string, unknown>) => write('info', msg, extra),
  warn: (msg: string, extra?: Record<string, unknown>) => write('warn', msg, extra),
  error: (msg: string, extra?: Record<string, unknown>) => write('error', msg, extra),
  debug: (msg: string, extra?: Record<string, unknown>) => write('debug', msg, extra),

  /** Create a child logger with preset context fields */
  child(context: Record<string, unknown>) {
    return {
      info: (msg: string, extra?: Record<string, unknown>) =>
        write('info', msg, { ...context, ...extra }),
      warn: (msg: string, extra?: Record<string, unknown>) =>
        write('warn', msg, { ...context, ...extra }),
      error: (msg: string, extra?: Record<string, unknown>) =>
        write('error', msg, { ...context, ...extra }),
      debug: (msg: string, extra?: Record<string, unknown>) =>
        write('debug', msg, { ...context, ...extra }),
    };
  },
};