// ABOUTME: Structured logging module using pino for JSON output to stdout.
// ABOUTME: Configurable via LOG_LEVEL env var, outputs parseable logs for aggregators.

import pino from "pino";

/**
 * PhaseFlow logger configured per observability spec.
 *
 * Log levels: error, warn, info, debug
 * Output: JSON to stdout
 * Configuration: LOG_LEVEL env var (defaults to "info")
 *
 * Usage:
 *   logger.info({ userId: "123" }, "User logged in");
 *   logger.error({ err: error, userId: "123" }, "Operation failed");
 */
export const logger = pino({
  level: process.env.LOG_LEVEL || "info",
  formatters: {
    level: (label) => ({ level: label }),
  },
  timestamp: () => `,"timestamp":"${new Date().toISOString()}"`,
  messageKey: "message",
});

export type Logger = typeof logger;