/** @module file */
/// <reference path="result.js" />
import { ERROR, OK } from "./result.js";
import { readFile as readF, writeFile as writeF } from "fs/promises";

const FILE_READ_ERROR_MESSAGE = "Error reading file from disk";
const FILE_WRITE_ERROR_MESSAGE = "Error writing file to disk";

/**
 * Try to read file from pathname
 * @returns {Result<String>} result of reading file
 */
async function readFile(filePath) {
  try {
    const data = await readF(filePath, "utf8");
    return [OK, data];
  } catch (err) {
    return [ERROR, `${FILE_READ_ERROR_MESSAGE}: ${err}`];
  }
}

/**
 * Try to write file to disk
 * @returns {Result<String>} result of writing file
 */
async function writeFile(filename, content) {
  try {
    await writeF(filename, content);
    return [OK, `File ${filename} created`];
  } catch (err) {
    return [ERROR, `${FILE_WRITE_ERROR_MESSAGE}: ${err}`];
  }
}

export { readFile, writeFile };