Initial commit

app/models/concerns/fee_chargeable.rb

@@ -0,0 +1,52 @@
+# encoding: UTF-8
+# frozen_string_literal: true
+
+module FeeChargeable
+  extend ActiveSupport::Concern
+
+  included do
+    attr_readonly :amount, :fee
+
+    validates :amount, presence: true, numericality: { greater_than: 0.to_d }
+    validates :fee,    presence: true, numericality: { greater_than_or_equal_to: 0.to_d }
+
+    if self <= Deposit
+      before_validation on: :create do
+        next unless currency
+        self.fee  ||= currency.deposit_fee
+        self.amount = amount.to_d - fee
+      end
+
+      validates :fee, numericality: { less_than: :amount }, if: -> (record) { record.amount.to_d > 0.to_d }
+    end
+
+    if self <= Withdraw
+      attr_readonly :sum
+
+      before_validation on: :create do
+        next unless currency
+
+        self.sum  ||= 0.to_d
+        self.fee  ||= currency.withdraw_fee
+        self.amount = sum - fee
+      end
+
+      validates :sum,
+                presence: true,
+                numericality: { greater_than: 0.to_d },
+                precision: { less_than_or_eq_to: ->(w) { w.currency.precision } }
+
+      validates :amount,
+                precision: { less_than_or_eq_to: ->(w) { w.currency.precision } }
+
+      validate on: :create do
+        next if !account || [sum, amount, fee].any?(&:blank?)
+
+        if sum > account.balance || (amount + fee) > sum
+          # raise ::Account::AccountError, 'Account balance is insufficient'
+          errors.add(:id, 'Account balance is insufficient')
+        end
+      end
+    end
+  end
+end