# @ts-check

import at_isArray from './isArray'
import at_split from './split'
import at_length from './length'

###* @type import('./at').At ###
export default (ipt, paths...) ->

  # Array access: support negative indices
  if at_isArray ipt
    at_index = paths[0]
    if at_index < 0
      return ipt[at_length(ipt) + at_index]
    return ipt[at_index]

  # Object access: support dot notation and multiple path segments
  at_path = if at_length(paths) == 1
    String paths[0]
  else
    at_segments = []
    for at_p in paths
      at_parts = at_split String(at_p), '.'
      for at_part in at_parts
        if at_part then at_segments.push at_part
    at_segments.join '.'

  # Traverse the object path
  at_keys = at_split at_path, '.'
  at_result = ipt
  for at_key in at_keys
    if at_result == undefined then return undefined
    at_result = at_result[at_key]
  return at_result