export type LogLevel = "INF" | "WRN" | "ERR" | "TRC" | "DBG";

const TAIPEI_FORMATTER = new Intl.DateTimeFormat("en-CA", {
  timeZone: "Asia/Taipei",
  year: "numeric",
  month: "2-digit",
  day: "2-digit",
  hour: "2-digit",
  minute: "2-digit",
  second: "2-digit",
  hour12: false,
});

export function formatTaipeiTimestamp(date: Date = new Date()): string {
  const parts = TAIPEI_FORMATTER.formatToParts(date);
  const get = (type: string) => parts.find((p) => p.type === type)?.value ?? "00";
  return `${get("year")}/${get("month")}/${get("day")} ${get("hour")}:${get("minute")}:${get("second")}`;
}

export function log(stage: string, level: LogLevel, message: string): void {
  const line = `[${formatTaipeiTimestamp()}][${stage}][${level}]: ${message}`;
  if (level === "ERR") {
    console.error(line);
  } else if (level === "WRN") {
    console.warn(line);
  } else {
    console.log(line);
  }
}