1# frozen_string_literal: true
2
3require_relative "expiring_lock"
4require_relative "transaction"
5
6class LowBalance
7 def self.for(customer, transaction_amount=0)
8 return Locked.new unless customer.registered?
9
10 ExpiringLock.new(
11 "jmp_customer_low_balance-#{customer.billing_customer_id}",
12 expiry: 60 * 60 * 24 * 7
13 ).with(-> { Locked.new }) do
14 customer.billing_customer.then do |billing_customer|
15 for_no_lock(billing_customer, transaction_amount)
16 end
17 end
18 end
19
20 def self.for_no_lock(customer, transaction_amount, auto: true)
21 if auto && customer.auto_top_up_amount.positive?
22 AutoTopUp.for(customer, transaction_amount)
23 else
24 customer.btc_addresses.then do |btc_addresses|
25 new(customer, btc_addresses, transaction_amount)
26 end
27 end
28 end
29
30 def initialize(customer, btc_addresses, transaction_amount=0)
31 @customer = customer
32 @btc_addresses = btc_addresses
33 @transaction_amount = transaction_amount
34 end
35
36 def notify!
37 m = Blather::Stanza::Message.new
38 m.from = CONFIG[:notify_from]
39 m.body =
40 "Your balance of $#{'%.4f' % @customer.balance} is low." \
41 "#{pending_cost_for_notification}" \
42 "#{btc_addresses_for_notification}"
43 @customer.stanza_to(m)
44 EMPromise.resolve(0)
45 end
46
47 def pending_cost_for_notification
48 return unless @transaction_amount&.positive?
49 return unless @transaction_amount > @customer.balance
50
51 "You need an additional " \
52 "$#{'%.2f' % (@transaction_amount - @customer.balance)} "\
53 "to complete this transaction."
54 end
55
56 def btc_addresses_for_notification
57 return if @btc_addresses.empty?
58
59 "\nYou can buy credit by sending any amount of Bitcoin to one of " \
60 "these addresses:\n#{@btc_addresses.join("\n")}"
61 end
62
63 class AutoTopUp
64 def self.for(customer, target=0)
65 customer.payment_methods.then(&:default_payment_method).then do |method|
66 blocked?(method).then do |block|
67 next AutoTopUp.new(customer, method, target) if block.zero?
68
69 log.info("#{customer.customer_id} auto top up blocked")
70 LowBalance.for_no_lock(customer, target, auto: false)
71 end
72 end
73 end
74
75 def self.blocked?(method)
76 return EMPromise.resolve(1) if method.nil?
77
78 REDIS.exists(
79 "jmp_auto_top_up_block-#{method&.unique_number_identifier}"
80 )
81 end
82
83 def initialize(customer, method=nil, target=0, margin: 10)
84 @customer = customer
85 @method = method
86 @target = target
87 @margin = margin
88 @message = Blather::Stanza::Message.new
89 @message.from = CONFIG[:notify_from]
90 end
91
92 def top_up_amount
93 [
94 (@target + @margin) - @customer.balance,
95 @customer.auto_top_up_amount
96 ].max
97 end
98
99 def sale
100 Transaction.sale(@customer, amount: top_up_amount).then do |tx|
101 tx.insert.then { tx }
102 end
103 end
104
105 def failed(e)
106 @method && REDIS.setex(
107 "jmp_auto_top_up_block-#{@method.unique_number_identifier}",
108 60 * 60 * 24 * 30,
109 Time.now
110 )
111 @message.body =
112 "Automatic top-up transaction for " \
113 "$#{top_up_amount} failed: #{e.message}"
114 0
115 end
116
117 def notify!
118 sale.then { |tx|
119 @message.body =
120 "Automatic top-up has charged your default " \
121 "payment method and added #{tx} to your balance."
122 tx.total
123 }.catch(&method(:failed)).then { |amount|
124 @customer.stanza_to(@message)
125 amount
126 }
127 end
128 end
129
130 class Locked
131 def notify!
132 EMPromise.resolve(0)
133 end
134 end
135end