1# frozen_string_literal: true
 2
 3class BillPlanCommand
 4	def self.for(customer)
 5		return ForUnregistered.new unless customer.registered?
 6
 7		unless customer.balance > customer.monthly_price
 8			return ForLowBalance.new(customer)
 9		end
10
11		new(customer)
12	end
13
14	def initialize(customer)
15		@customer = customer
16	end
17
18	def call
19		@customer.bill_plan
20		Command.reply do |reply|
21			reply.note_type = :info
22			reply.note_text = "Customer billed"
23		end
24	end
25
26	class ForLowBalance
27		def initialize(customer)
28			@customer = customer
29		end
30
31		def call
32			LowBalance.for(@customer).then(&:notify!).then do |amount|
33				return command_for(amount).call if amount&.positive?
34
35				notify_failure
36				Command.reply do |reply|
37					reply.note_type = :error
38					reply.note_text = "Customer balance is too low"
39				end
40			end
41		end
42
43	protected
44
45		def notify_failure
46			m = Blather::Stanza::Message.new
47			m.from = CONFIG[:notify_from]
48			m.body =
49				"Failed to renew account for #{@customer.registered?.phone}. " \
50				"To keep your number, please buy more credit soon."
51			@customer.stanza_to(m)
52		end
53
54		def command_for(amount)
55			BillPlanCommand.for(
56				@customer.with_balance(@customer.balance + amount)
57			)
58		end
59	end
60
61	class ForUnregistered
62		def call
63			Command.reply do |reply|
64				reply.note_type = :error
65				reply.note_text = "Customer is not registered"
66			end
67		end
68	end
69end