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])
75 INSERT INTO plan_log
76 (customer_id, plan_name, date_range)
77 VALUES (
78 $1,
79 $2,
80 tsrange(
81 LOCALTIMESTAMP - '2 seconds'::interval,
82 LOCALTIMESTAMP - '1 second'::interval
83 )
84 )
85 SQL
86 end
87
88 def bill_plan(note: nil)
89 EMPromise.resolve(nil).then do
90 DB.transaction do |db|
91 next false unless !block_given? || yield(db)
92
93 charge_for_plan(note)
94 extend_plan
95 true
96 end
97 end
98 end
99
100 def activate_plan_starting_now
101 activated = DB.exec(<<~SQL, [@customer_id, plan_name, @parent_customer_id])
102 INSERT INTO plan_log (customer_id, plan_name, date_range, parent_customer_id)
103 VALUES ($1, $2, tsrange(LOCALTIMESTAMP, LOCALTIMESTAMP + '1 month'), $3)
104 ON CONFLICT DO NOTHING
105 SQL
106 activated = activated.cmd_tuples.positive?
107 return false unless activated
108
109 DB.exec(<<~SQL, [@customer_id])
110 DELETE FROM plan_log WHERE customer_id=$1 AND date_range << '[now,now]'
111 AND upper(date_range) - lower(date_range) < '2 seconds'
112 SQL
113 end
114
115 def extend_plan
116 add_one_month_to_current_plan unless activate_plan_starting_now
117 end
118
119 def activation_date
120 DB.query_one(<<~SQL, @customer_id).then { |r| r[:start_date] }
121 SELECT
122 MIN(LOWER(date_range)) AS start_date
123 FROM plan_log WHERE customer_id = $1;
124 SQL
125 end
126
127protected
128
129 def charge_for_plan(note)
130 params = [
131 @customer_id,
132 "#{@customer_id}-bill-#{plan_name}-at-#{Time.now.to_i}",
133 -@plan.monthly_price,
134 note
135 ]
136 DB.exec(<<~SQL, params)
137 INSERT INTO transactions
138 (customer_id, transaction_id, created_at, settled_after, amount, note)
139 VALUES ($1, $2, LOCALTIMESTAMP, LOCALTIMESTAMP, $3, $4)
140 SQL
141 end
142
143 def add_one_month_to_current_plan
144 DB.exec(<<~SQL, [@customer_id])
145 UPDATE plan_log SET date_range=range_merge(
146 date_range,
147 tsrange(
148 LOCALTIMESTAMP,
149 GREATEST(upper(date_range), LOCALTIMESTAMP) + '1 month'
150 )
151 )
152 WHERE
153 customer_id=$1 AND
154 date_range && tsrange(LOCALTIMESTAMP, LOCALTIMESTAMP + '1 month')
155 SQL
156 end
157end