/**
 * @file https://github.com/simonlast/node-persist
 */
import { sep } from 'path'
import { readFileSync, writeFileSync, existsSync } from 'fs'
import { sync } from 'mkdirp'
import { stringify, Serializable } from '../../deps/stringify'

/**
 * @tutorial https://shapeshed.com/writing-cross-platform-node/
 * @description path separator for any platform
 * @type {Path.sep | '\\' | '/'}
 */
const separator = sep

/**
 * @tutorial http://stackabuse.com/read-files-with-node-js/
 * @param {String} absolutePath path to read from
 */
function read(absolutePath: string) {
  makePathIfNeeded(absolutePath)
  return readFileSync(absolutePath, 'utf8')
}

function tryJSON(json: string) {
  try {
    const parsed = JSON.parse(json)
    return parsed
  } catch (parseError) {
    return false
  }
}

/**
 * @return parsed json or fallback object
 */
function readJSON(absolutePath: string, fallback = { readfailed: true }) {
  return tryJSON(read(absolutePath)) || fallback
}

/**
 * @description split file into [directory, filename]
 *              check if directory exists
 *              mkdirp creates path compat
 *              fs always can create a single file, but not a dir
 *
 * @return true if it had to create it, false if not
 */
function makePathIfNeeded(absolutePath: string): boolean {
  // get the final dir excluding the file
  const finalOutputDirList = absolutePath.split(separator)
  finalOutputDirList.pop()
  const finalOutputDir = finalOutputDirList.join(separator)

  // make the final dir if it does not exist
  if (existsSync(finalOutputDir) === false) {
    sync(finalOutputDir)
    return true
  }

  return false
}

/**
 * @description write contents to a path
 * @param absolutePath path to write content to
 * @param content serializes content to write to file
 * @return wrote successfully
 */
function write(absolutePath: string, content: Serializable) {
  let contents = content

  // if !isPrimitive?
  if (typeof contents !== 'string') {
    contents = stringify(content as any)
  }

  makePathIfNeeded(absolutePath)
  return writeFileSync(absolutePath, contents, 'utf8')
}

read.json = readJSON
const exists = existsSync

export { read, write, readJSON, exists }