import settle from 'p-settle'
import { promisify } from 'util'
import { readFile } from 'fs'
import path from 'path'
const read = promisify(readFile)

// A helper function to return a list of paths to ignore from .npmignore, .gitignore, .rcignore
function ignore (repoPath,files) {
  // console.log('additional files', files)
  let ignoreList = []
  let ignoreFiles = ['.npmignore','.gitignore','.rcignore']
  if (Array.isArray(files)) {
    ignoreFiles=[...ignoreFiles,...files]
  } else {
    if (files) ignoreFiles.push(files)
  }

  // each set in an the array is new line delimited set of ignore patterns
  return settle(ignoreFiles.map(file => {
    // console.log('directory',path.dirname(file))
    if (path.dirname(file)==='.') file = repoPath+'/'+file
    // console.log('file', file)
    return read(file)
  }))
    .then((sets) => {
      sets.forEach( set =>  {
        if (set.isFulfilled) ignoreList.push(...set.value.toString().match(/.+/g))
        else console.log('READ ERROR=> ',set.reason.Error)
      })
      // console.log('built list=====================', ignoreList)
      return Promise.resolve(ignoreList)
    })
    .catch((err) => {
      // only returned when something horrible is wrong
      return Promise.reject(err)
    })
}

export default ignore