module Ratis

  class Point2Point

    def self.where(conditions)
      routes_only = conditions.delete(:routes_only)

      origin_lat = conditions.delete(:origin_lat).to_f
      origin_long = conditions.delete(:origin_long).to_f
      destination_lat = conditions.delete(:destination_lat).to_f
      destination_long = conditions.delete(:destination_long).to_f

      date = conditions.delete :date
      start_time = conditions.delete :start_time
      end_time = conditions.delete :end_time

      raise ArgumentError.new("You must specify routes only with true, false, 'y' or 'n'") unless routes_only.y_or_n rescue false

      raise ArgumentError.new('You must provide an origin latitude') unless Ratis.valid_latitude? origin_lat
      raise ArgumentError.new('You must provide an origin longitude') unless Ratis.valid_longitude? origin_long
      raise ArgumentError.new('You must provide an destination latitude') unless Ratis.valid_latitude? destination_lat
      raise ArgumentError.new('You must provide an destination longitude') unless Ratis.valid_longitude? destination_long

      raise ArgumentError.new('You must provide a date DD/MM/YYYY') unless DateTime.strptime(date, '%d/%m/%Y') rescue false
      raise ArgumentError.new('You must provide a start time as 24-hour HHMM') unless DateTime.strptime(start_time, '%H%M') rescue false
      raise ArgumentError.new('You must provide an end time as 24-hour HHMM') unless DateTime.strptime(end_time, '%H%M') rescue false

      Ratis.all_conditions_used? conditions

      response = Request.get 'Point2point', 'Routesonly' => routes_only.y_or_n.upcase,
        'Originlat' => origin_lat, 'Originlong' => origin_long,
        'Destinationlat' => destination_lat, 'Destinationlong' => destination_long,
        'Date' => date, 'Starttime' => start_time, 'Endtime' => end_time

      return nil unless response.success?

      return parse_routes_only_yes response if routes_only.y_or_n.downcase == 'y'
      return parse_routes_only_no response if routes_only.y_or_n.downcase == 'n'

      nil
    end

  private

    def self.parse_routes_only_yes(response)
      response.to_array(:point2point_response, :routes, :service).map do |service|
        atis_service = Service.new
        atis_service.route = service[:route]
        atis_service.direction = service[:direction]
        atis_service.service_type = service[:servicetype]
        atis_service.signage = service[:signage]
        atis_service.route_type = service[:routetype]
        atis_service
      end
    end

    def self.parse_routes_only_no(response)
      return nil unless response.success?

      atis_schedule = Schedule.new
      atis_schedule.groups = response.to_array(:point2point_response, :groups, :group).map do |group|
        atis_schedule_group = ScheduleGroup.new

        # Point2point 1.3 uses inconsistent tag naming, thus: <onstop> <onwalk...>, but <offstop> <offstopwalk...>
        # this docs says this is fixed in 1.4, so watch out
        atis_schedule_group.on_stop = atis_stop_from_hash 'on', group[:onstop]
        atis_schedule_group.off_stop = atis_stop_from_hash 'offstop', group[:offstop]

        atis_schedule_group.trips = group.to_array(:trips, :trip).map do |trip|
          atis_trip = ScheduleTrip.new
          atis_trip.on_time = trip[:ontime]
          atis_trip.off_time = trip[:offtime]

          atis_trip.service = trip.to_array(:service).map do |service|
            atis_service = Service.new

            atis_service.route = service[:route]
            atis_service.direction = service[:direction]
            atis_service.service_type = service[:servicetype]
            atis_service.signage = service[:signage]
            atis_service.route_type = service[:routetype]
            atis_service.exception = service[:exception]
            atis_service
          end.first

          atis_trip
        end

        atis_schedule_group
      end

      atis_schedule
    end

    def self.atis_stop_from_hash(prefix, stop)
      return nil if stop.blank?

      atis_stop = Stop.new
      atis_stop.description = stop[:description]
      atis_stop.atis_stop_id = stop[:atisstopid].to_i
      atis_stop.latitude = stop[:lat].to_f
      atis_stop.longitude = stop[:long].to_f

      # It appears that both *walk and *walkdist are used for the walk distance, covering both here
      atis_stop.walk_dist = (stop["#{prefix}walk".to_sym] || stop["#{prefix}walkdist".to_sym]).to_f
      atis_stop.walk_dir = stop["#{prefix}walkdir".to_sym]
      atis_stop.walk_hint = stop["#{prefix}walkhint".to_sym]
      atis_stop
    end
  end

end