1# frozen_string_literal: true
 2
 3require_relative "expiring_lock"
 4require_relative "transaction"
 5
 6class LowBalance
 7	def self.for(customer)
 8		ExpiringLock.new(
 9			"jmp_low_balance_notify-#{customer.customer_id}"
10		).with(-> { Locked.new }) do
11			customer.auto_top_up_amount.then do |auto_top_up_amount|
12				for_auto_top_up_amount(customer, auto_top_up_amount)
13			end
14		end
15	end
16
17	def self.for_auto_top_up_amount(customer, auto_top_up_amount)
18		if auto_top_up_amount.positive?
19			AutoTopUp.new(customer, auto_top_up_amount)
20		else
21			customer.btc_addresses.then do |btc_addresses|
22				new(customer, btc_addresses)
23			end
24		end
25	end
26
27	def initialize(customer, btc_addresses)
28		@customer = customer
29		@btc_addresses = btc_addresses
30	end
31
32	def notify!
33		m = Blather::Stanza::Message.new
34		m.from = CONFIG[:notify_from]
35		m.body =
36			"Your balance of $#{'%.4f' % @customer.balance} is low." \
37			"#{btc_addresses_for_notification}"
38		@customer.stanza_to(m)
39	end
40
41	def btc_addresses_for_notification
42		return if @btc_addresses.empty?
43		"\nYou can buy credit by sending any amount of Bitcoin to one of " \
44		"these addresses:\n#{@btc_addresses.join("\n")}"
45	end
46
47	class AutoTopUp
48		def initialize(customer, auto_top_up_amount)
49			@customer = customer
50			@auto_top_up_amount = auto_top_up_amount
51			@message = Blather::Stanza::Message.new
52			@message.from = CONFIG[:notify_from]
53		end
54
55		def sale
56			Transaction.sale(@customer, amount: @auto_top_up_amount).then do |tx|
57				tx.insert.then { tx }
58			end
59		end
60
61		def notify!
62			sale.then { |tx|
63				@message.body =
64					"Automatic top-up has charged your default " \
65					"payment method and added #{tx} to your balance."
66			}.catch { |e|
67				@message.body =
68					"Automatic top-up transaction for " \
69					"$#{@auto_top_up_amount} failed: #{e.message}"
70			}.then { @customer.stanza_to(@message) }
71		end
72	end
73
74	class Locked
75		def notify!; end
76	end
77end