1# frozen_string_literal: true
 2
 3require "delegate"
 4require "nokogiri"
 5
 6class LocalCallingGuideRepo
 7	class Prefix < SimpleDelegator
 8		# @return [Float]
 9		def lat
10			at("rc-lat").text.to_f
11		end
12
13		# @return [Float]
14		def lon
15			at("rc-lon").text.to_f
16		end
17
18		# @return [String]
19		def region
20			at("region").text
21		end
22
23		# @return [String]
24		def locality
25			at("rc").text
26		end
27
28		# @return [Hash<String, String>]
29		def to_h
30			{ "region" => region, "locality" => locality }
31		end
32	end
33
34	# @param npa [String] area code (first 3 digits after country code)
35	# @param nxx [String] exchange (digits 4-6)
36	# @return [EMPromise<Prefix>]
37	# @raise [RuntimeError] if no prefix data found
38	def find(npa, nxx)
39		EM::HttpRequest.new(
40			"https://localcallingguide.com/xmlprefix.php",
41			tls: { verify_peer: true }
42		).aget(query: { npa: npa, nxx: nxx }).then { |res|
43			prefix = Nokogiri::XML.parse(res.response).at("prefixdata")
44			raise "No prefix data for #{npa}-#{nxx}" unless prefix
45
46			Prefix.new(prefix)
47		}
48	end
49end