1# frozen_string_literal: true
 2
 3require_relative "expiring_lock"
 4require_relative "transaction"
 5
 6class LowBalance
 7	def self.for(customer)
 8		return Locked.new unless customer.registered?
 9
10		ExpiringLock.new(
11			"jmp_customer_low_balance-#{customer.customer_id}",
12			expiry: 60 * 60 * 24 * 7
13		).with(-> { Locked.new }) do
14			for_auto_top_up_amount(customer)
15		end
16	end
17
18	def self.for_auto_top_up_amount(customer)
19		if customer.auto_top_up_amount.positive?
20			AutoTopUp.new(customer)
21		else
22			customer.btc_addresses.then do |btc_addresses|
23				new(customer, btc_addresses)
24			end
25		end
26	end
27
28	def initialize(customer, btc_addresses)
29		@customer = customer
30		@btc_addresses = btc_addresses
31	end
32
33	def notify!
34		m = Blather::Stanza::Message.new
35		m.from = CONFIG[:notify_from]
36		m.body =
37			"Your balance of $#{'%.4f' % @customer.balance} is low." \
38			"#{btc_addresses_for_notification}"
39		@customer.stanza_to(m)
40	end
41
42	def btc_addresses_for_notification
43		return if @btc_addresses.empty?
44
45		"\nYou can buy credit by sending any amount of Bitcoin to one of " \
46		"these addresses:\n#{@btc_addresses.join("\n")}"
47	end
48
49	class AutoTopUp
50		def initialize(customer)
51			@customer = customer
52			@message = Blather::Stanza::Message.new
53			@message.from = CONFIG[:notify_from]
54		end
55
56		def sale
57			Transaction.sale(
58				@customer,
59				amount: @customer.auto_top_up_amount
60			).then do |tx|
61				tx.insert.then { tx }
62			end
63		end
64
65		def notify!
66			sale.then { |tx|
67				@message.body =
68					"Automatic top-up has charged your default " \
69					"payment method and added #{tx} to your balance."
70			}.catch { |e|
71				@message.body =
72					"Automatic top-up transaction for " \
73					"$#{@customer.auto_top_up_amount} failed: #{e.message}"
74			}.then { @customer.stanza_to(@message) }
75		end
76	end
77
78	class Locked
79		def notify!; end
80	end
81end