import { randomUUID } from 'node:crypto';
import { mkdir, readFile, rename, rm, writeFile } from 'node:fs/promises';
import path from 'node:path';

export type JsonFileWriter = (filePath: string, value: unknown) => Promise<void>;

export async function atomicWriteText(filePath: string, source: string): Promise<void> {
  await mkdir(path.dirname(filePath), { recursive: true });
  const temporaryPath = path.join(
    path.dirname(filePath),
    `.${path.basename(filePath)}.${randomUUID()}.tmp`,
  );
  try {
    await writeFile(temporaryPath, source, { encoding: 'utf8', flag: 'wx' });
    await rename(temporaryPath, filePath);
  } finally {
    await rm(temporaryPath, { force: true }).catch(() => undefined);
  }
}

export async function atomicWriteJson(filePath: string, value: unknown): Promise<void> {
  await atomicWriteText(filePath, `${JSON.stringify(value, null, 2)}\n`);
}

export async function readJsonFile(filePath: string): Promise<unknown> {
  return JSON.parse(await readFile(filePath, 'utf8')) as unknown;
}