1# frozen_string_literal: true
2
3require "forwardable"
4
5require_relative "em"
6require_relative "plan"
7
8class CustomerPlan
9 extend Forwardable
10
11 attr_reader :expires_at, :auto_top_up_amount, :monthly_overage_limit,
12 :parent_customer_id
13
14 def_delegator :@plan, :name, :plan_name
15 def_delegators :@plan, :currency, :merchant_account, :monthly_price,
16 :minute_limit, :message_limit
17
18 def self.for(customer_id, plan_name: nil, **kwargs)
19 new(customer_id, plan: plan_name&.then(&Plan.method(:for)), **kwargs)
20 end
21
22 def self.default(customer_id, jid)
23 config = CONFIG[:parented_domains][Blather::JID.new(jid).domain]
24 if config
25 self.for(
26 customer_id,
27 plan_name: config[:plan_name],
28 parent_customer_id: config[:customer_id]
29 )
30 else
31 new(customer_id)
32 end
33 end
34
35 def self.extract(customer_id, **kwargs)
36 self.for(
37 customer_id,
38 **kwargs.slice(
39 :plan_name, :expires_at, :parent_customer_id,
40 :auto_top_up_amount, :monthly_overage_limit
41 )
42 )
43 end
44
45 def initialize(
46 customer_id,
47 plan: nil,
48 expires_at: Time.now,
49 auto_top_up_amount: 0,
50 monthly_overage_limit: 0,
51 parent_customer_id: nil
52 )
53 @customer_id = customer_id
54 @plan = plan || OpenStruct.new
55 @expires_at = expires_at
56 @auto_top_up_amount = auto_top_up_amount || 0
57 @monthly_overage_limit = monthly_overage_limit || 0
58 @parent_customer_id = parent_customer_id
59 end
60
61 def active?
62 plan_name && @expires_at > Time.now
63 end
64
65 def with_plan_name(plan_name)
66 self.class.new(
67 @customer_id,
68 plan: Plan.for(plan_name),
69 expires_at: @expires_at
70 )
71 end
72
73 def save_plan!
74 DB.exec_defer(<<~SQL, [@customer_id, plan_name, @parent_customer_id])
75 INSERT INTO plan_log
76 (customer_id, plan_name, parent_customer_id, date_range)
77 VALUES (
78 $1,
79 $2,
80 $3,
81 tsrange(
82 LOCALTIMESTAMP - '2 seconds'::interval,
83 LOCALTIMESTAMP - '1 second'::interval
84 )
85 )
86 SQL
87 end
88
89 def bill_plan(note: nil)
90 EMPromise.resolve(nil).then do
91 DB.transaction do |db|
92 next false unless !block_given? || yield(db)
93
94 charge_for_plan(note)
95 extend_plan
96 true
97 end
98 end
99 end
100
101 def activate_plan_starting_now
102 activated = DB.exec(<<~SQL, [@customer_id, plan_name, @parent_customer_id])
103 INSERT INTO plan_log (customer_id, plan_name, date_range, parent_customer_id)
104 VALUES ($1, $2, tsrange(LOCALTIMESTAMP, LOCALTIMESTAMP + '1 month'), $3)
105 ON CONFLICT DO NOTHING
106 SQL
107 activated = activated.cmd_tuples.positive?
108 return false unless activated
109
110 DB.exec(<<~SQL, [@customer_id])
111 DELETE FROM plan_log WHERE customer_id=$1 AND date_range << '[now,now]'
112 AND upper(date_range) - lower(date_range) < '2 seconds'
113 SQL
114 end
115
116 def extend_plan
117 add_one_month_to_current_plan unless activate_plan_starting_now
118 end
119
120 def activation_date
121 DB.query_one(<<~SQL, @customer_id).then { |r| r[:start_date] }
122 SELECT
123 MIN(LOWER(date_range)) AS start_date
124 FROM plan_log WHERE customer_id = $1;
125 SQL
126 end
127
128protected
129
130 def charge_for_plan(note)
131 params = [
132 @customer_id,
133 "#{@customer_id}-bill-#{plan_name}-at-#{Time.now.to_i}",
134 -@plan.monthly_price,
135 note
136 ]
137 DB.exec(<<~SQL, params)
138 INSERT INTO transactions
139 (customer_id, transaction_id, created_at, settled_after, amount, note)
140 VALUES ($1, $2, LOCALTIMESTAMP, LOCALTIMESTAMP, $3, $4)
141 SQL
142 end
143
144 def add_one_month_to_current_plan
145 DB.exec(<<~SQL, [@customer_id])
146 UPDATE plan_log SET date_range=range_merge(
147 date_range,
148 tsrange(
149 LOCALTIMESTAMP,
150 GREATEST(upper(date_range), LOCALTIMESTAMP) + '1 month'
151 )
152 )
153 WHERE
154 customer_id=$1 AND
155 date_range && tsrange(LOCALTIMESTAMP, LOCALTIMESTAMP + '1 month')
156 SQL
157 end
158end