1# frozen_string_literal: true
 2
 3class BuyAccountCreditForm
 4	class AmountValidationError < StandardError
 5		def initialize(amount)
 6			super(
 7				"amount #{amount} must be in the range " \
 8				"#{RANGE.first} through #{RANGE.last}"
 9			)
10		end
11	end
12
13	def self.for(customer)
14		customer.payment_methods.then do |payment_methods|
15			new(customer.balance, payment_methods)
16		end
17	end
18
19	def initialize(balance, payment_methods)
20		@balance = balance
21		@payment_methods = payment_methods
22	end
23
24	RANGE = (15..1000).freeze
25
26	def form
27		FormTemplate.render(
28			:top_up,
29			balance: @balance,
30			payment_methods: @payment_methods,
31			range: RANGE
32		)
33	end
34
35	def parse(form)
36		amount = form.field("amount")&.value&.to_s
37		raise AmountValidationError, amount unless RANGE.include?(amount.to_i)
38
39		{
40			payment_method: @payment_methods.fetch(
41				form.field("payment_method")&.value.to_i
42			),
43			amount: amount
44		}
45	end
46end