_ = require('lodash')
module.exports = (params) ->
  segments = []
  first_iata = null
  for segment, index in params.segments
    force_origin_iata = false
    origin_iata = segment.origin.iata || params.segments[index].origin
    destination_iata = segment.destination.iata || params.segments[index].destination
    first_iata = origin_iata if index is 0

    back_to_origin = index == params.segments.length - 1 and first_iata == destination_iata

    if !!prev_destination_iata and (prev_destination_iata != origin_iata)
      segments.push('-')
      force_origin_iata = true

    origin = if ((index is 0) or force_origin_iata) then origin_iata else ''
    destination = if back_to_origin then '' else destination_iata
    date_parts = segment.date.split('-')

    segments.push("#{origin}#{date_parts[2]}#{date_parts[1]}#{destination}")

    prev_destination_iata = destination_iata

  for i in _.range(7)
    segments[i] or= ''

  url_obj =
    segments: segments
    trip_class: if params.trip_class is 'C' then 'b' else ''
    adults: params.passengers.adults
    children: if params.passengers.infants then params.passengers.children else (params.passengers.children or '')
    infants: params.passengers.infants or ''

  "/#{ url_obj.segments[0] }" +
    "#{ url_obj.segments[1] }#{ url_obj.segments[2] }#{ url_obj.segments[3] }" +
    "#{ url_obj.segments[4] }#{ url_obj.segments[5] }#{ url_obj.segments[6] }" +
    "#{ url_obj.trip_class }#{ url_obj.adults }#{ url_obj.children }#{ url_obj.infants }"