export function getFileExtension (fileName) {
  const regex = new RegExp('[^.]+$');
  return fileName.match(regex)?.[0];
}
export function getFileBasename (fileName) {
  const regex = new RegExp('^[^.]+');
  return fileName.match(regex)?.[0]
}

export function parseFileName (s) {
  const pattern = /(?<base>^.+)\.(?<extension>[^.]+?$)/
  const match = s.match(pattern)
  if (match && match.groups){
    return {
      fileName: match.groups.base,
      fileExtension: match.groups.extension,
    }
  } else {
    return {fileName: s}
  }
}

const createFileNameDefaultOptions = {
  meta_separator : "__",
  category_prefix : "", 
  tag_prefix: "<>", 
  tag_separator: "",
  lowerCase: true,
  noSymbols: true,
}

export function createMetaFileName(originalFileName, meta={category:"", tags:[]}, options) {
  const {
    meta_separator,
    category_prefix, 
    tag_prefix,
    tag_separator,
    lowerCase,
    noSymbols
  } = {...createFileNameDefaultOptions,...options}

  let {fileName, fileExtension} = parseFileName(originalFileName)

  const category_string = `${category_prefix}${meta.category}`
  const tag_string = `${meta.tags.map(tag=>tag_prefix+tag).join('')}`

  fileName = `${fileName}${meta_separator}${category_string}${tag_separator}${tag_string}`

  if (lowerCase) {
    fileName = fileName.toLowerCase()
  }

  if (noSymbols) {
    fileName = fileName.replace(/[^a-z0-9_-]/g,'-')
  }

  return `${fileName}.${fileExtension}`
}