import type { Envelope } from "@/interfaces";

let jsonMode = false;

export const setJsonMode = (on: boolean): void => {
  jsonMode = on;
};

export const isJsonMode = (): boolean => jsonMode;

export const printJson = <T>(env: Envelope<T>): void => {
  process.stdout.write(`${JSON.stringify(env)}\n`);
};

export const printHuman = (text: string): void => {
  process.stdout.write(`${text}\n`);
};

const toStderr = (line: string): void => {
  process.stderr.write(`${line}\n`);
};

export const logInfo = (line: string): void => {
  if (jsonMode) toStderr(line);
  else process.stderr.write(`${line}\n`);
};

export const logWarn = (line: string): void => {
  toStderr(line);
};

export const enterJsonMode = (on: boolean): void => {
  setJsonMode(on);
  if (on) installJsonLogRedirect();
};

export const installJsonLogRedirect = (): void => {
  // In JSON mode, stdout must stay machine-parseable, so we redirect every
  // console stream (including the ones chalk/crawler utilities use) to stderr.
  const writeErr = (args: unknown[]): void => {
    const text = args.map((a) => (typeof a === "string" ? a : JSON.stringify(a))).join(" ");
    process.stderr.write(`${text}\n`);
  };
  console.info = (...args: unknown[]) => writeErr(args);
  console.warn = (...args: unknown[]) => writeErr(args);
  console.error = (...args: unknown[]) => writeErr(args);
  // eslint-disable-next-line no-console
  console.log = (...args: unknown[]) => writeErr(args);
};