writeFile.js

const fs = require('fs');

/* 
checks if dir exists , if not create the dir with path passed
@params {String} path : path of dir to check if exists
@returns {Promise} promise : Promise of path of dir created or existed
 */
async function createDirIfNotExists(path) {
    if (!path) throw new Error("Path should not be null")

    if (!fs.existsSync(path)) {
        fs.mkdirSync(path, { recursive: true });
    }

    return Promise.resolve(path)
}

/* 
Write data into the file with path passed
@params {String} path : path of dir to to write
@params {Object} data : data to write
@returns {Promise} promise : resolved promise if write is successful , else reject promise
 */
async function writeJSON(path, data) {
    //checking if data is object 
    if (typeof data !== 'object' || data === null) {
        return Promise.reject(new Error("Invalid data"))
    }

    let [splittedPath, fileName] = getDirPathAndFile(path);

    splittedPath = await createDirIfNotExists(splittedPath);

    data = JSON.stringify(data);

    fs.writeFile(splittedPath + "/" + fileName, data, function (err) {
        if (err) {
            throw Promise.reject(err)
        }
        return Promise.resolve()
    });

}

/* 
get dir path and file name for a give path
@params {String} path : path of dir to to write
@returns {Array} [dirPath, fileName] : [dirPath, fileName]
 */
function getDirPathAndFile(path) {
    return [path.split("/").slice(0, -1).join('/'), path.split("/").pop()]
}

module.exports = { createDirIfNotExists, writeJSON }


//console.log(getDirPathAndFile("/Users/user/codes/sarojtask/test"))

/* createDirIfNotExists("/Users/user / codes / sarojtask / test")
    .then(res => console.log(res))
    .catch(err => console.log(err)) */

/* writeJSON("/Users/user/codes/sarojtask/a/b/c", { data: "s" })
    .then(res => console.log(res))
    .catch(err => console.log(err)) */