const rTrue=['t','true','y','yes','on','positive','up','enabled','affirmative','yea','sure']
const rFalse=['f','false','n','no','off','negative','down','disabled','nope']

function createBoolean (opts={}) {
  return (value => {
    if (value===undefined) return opts.undefined
    if (value===null) return opts.null
    if (!isNaN(Number(value))) return Number(value) <1 ? false :true
    if (typeof value==='string') {
      value = value.trim()
      value = value.toLowerCase()
      if ((opts.rTrue || rTrue).includes(value)) return true
      if ((opts.rFalse || rFalse).includes(value)) return false
    }
    return !!value
  })
}

const toBoolean = createBoolean()

export default toBoolean
export { toBoolean, createBoolean, rTrue, rFalse }