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import { assocPath } from './assocPath'import { path as pathModule } from './path'const ALLOWED_OPERATIONS = [ 'remove', 'add', 'update' ]
export function removeAtPath(path, obj){  const p = typeof path === 'string' ? path.split('.') : path
  const len = p.length  if (len === 0) return  if (len === 1) return delete obj[ p[ 0 ] ]  if (len === 2) return delete obj[ p[ 0 ] ][ p[ 1 ] ]  if (len === 3) return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ]  if (len === 4) return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ]  if (len === 5) return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ][ p[ 4 ] ]  if (len === 6){    return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ][ p[ 4 ] ][ p[ 5 ] ]  }  if (len === 7){    return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ][ p[ 4 ] ][ p[ 5 ] ][ p[ 6 ] ]  }  if (len === 8){    return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ][ p[ 4 ] ][ p[ 5 ] ][ p[ 6 ] ][ p[ 7 ] ]  }  if (len === 9){    return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ][ p[ 4 ] ][ p[ 5 ] ][ p[ 6 ] ][ p[ 7 ] ][ p[ 8 ] ]  }  if (len === 10){    return delete obj[ p[ 0 ] ][ p[ 1 ] ][ p[ 2 ] ][ p[ 3 ] ][ p[ 4 ] ][ p[ 5 ] ][ p[ 6 ] ][ p[ 7 ] ][ p[ 8 ] ][      p[ 9 ]    ]  }}
export function applyDiff(rules, obj){  if (arguments.length === 1) return _obj => applyDiff(rules, _obj)
  let clone = { ...obj }
  rules.forEach(({ op, path, value }) => {    if (!ALLOWED_OPERATIONS.includes(op)) return    if (op === 'add' && path && value !== undefined){      if (pathModule(path, obj)) return
      return clone = assocPath(        path, value, clone      )    }
    if (op === 'remove'){      if (pathModule(path, obj) === undefined) return
      return removeAtPath(path, clone)    }    if (op === 'update' && path && value !== undefined){      if (pathModule(path, obj) === undefined) return
      return clone = assocPath(        path, value, clone      )    }  })
  return clone}