// Helpers for filesystem / folder manipulations and loading files
import fs from 'fs'
import readYamlAndMarkdown from 'yaml-head-loader'

// Loads the text of a file
async function loadTextFile(path) {
  return new Promise((resolve, reject) => {
    fs.readFile(path, 'utf8', function(err, data) {
      if (err) {
        console.log('Reading file failed:', err)
        return null
      }
      resolve(data)
    })
  })
}

export async function loadJsonFile(path) {
  const loadedText = await loadTextFile(path)
  return JSON.parse(loadedText)
}

// Loads the given text file and returns a dictionary of its contents parsed into a .header dict and .tail markdown content
export async function loadYamlMarkdownFile(path) {
  let text = await loadTextFile(path)
  if(!text) {
    return null
  }
  let dict = readYamlAndMarkdown(text)
  return dict
}

// Loads and returns the list of contents of a folder as an array
export function lsFolder(path) {
  try {
    return fs.readdirSync(path).filter(fileOrFolderName => fileOrFolderName.length >= 1 && fileOrFolderName[0] !== '.')
  } catch(err) {
    return null
  }
}

// Returns true if the path is a folder 
export function isFolder(path) {
  return Array.isArray(lsFolder(path))
}

// This might also return true for folders, plz fix
export function isFile(path) {
  return fs.existsSync(path)
}