Some tests for invoice binding

app/models/account_activity.rb

@@ -1,4 +1,12 @@
 class AccountActivity < ActiveRecord::Base
   belongs_to :account
+  belongs_to :bank_transaction
+  belongs_to :invoice
+
+  after_create :update_balance
+  def update_balance
+    account.balance += sum
+    account.save
+  end
 end
 

app/models/bank_statement.rb

@@ -3,6 +3,8 @@ class BankStatement < ActiveRecord::Base
 
   attr_accessor :th6_file
 
+  validates :bank_code, :iban, :queried_at, presence: true
+
   def import
     import_th6_file && save
   end
@@ -47,4 +49,8 @@ class BankStatement < ActiveRecord::Base
     self.queried_at = DateTime.strptime(row[30, 10].strip, '%y%m%d%H%M')
     nil
   end
+
+  def bind_with_invoices
+    bank_transactions.unbinded.each(&:bind_with_invoice)
+  end
 end

app/models/bank_transaction.rb

@@ -1,3 +1,38 @@
 class BankTransaction < ActiveRecord::Base
   belongs_to :bank_statement
+  has_one :account_activity
+
+  scope :unbinded, -> { where('id NOT IN (SELECT bank_transaction_id FROM account_activities)') }
+
+  def binded?
+    account_activity.present?
+  end
+
+  # For successful binding, reference number, invoice id and sum must match with the invoice
+  # rubocop: disable Metrics/PerceivedComplexity
+  # rubocop: disable Metrics/CyclomaticComplexity
+  def bind_with_invoice
+    return if binded?
+    registrar = Registrar.find_by(reference_no: reference_no)
+    return unless registrar
+
+    match = description.match(/^[^\d]*(\d+)/)
+    return unless match
+
+    invoice_id = match[1].to_i
+    return unless invoice_id
+
+    invoice = registrar.invoices.find_by(id: invoice_id)
+    return unless invoice
+
+    return if invoice.sum != sum
+    create_account_activity(
+      account: registrar.cash_account,
+      invoice: invoice,
+      sum: sum,
+      currency: currency
+    )
+  end
+  # rubocop: enable Metrics/PerceivedComplexity
+  # rubocop: enable Metrics/CyclomaticComplexity
 end

app/models/invoice.rb

@@ -27,15 +27,15 @@ class Invoice < ActiveRecord::Base
     invoice_items
   end
 
-  def total_without_vat
-    items.map(&:item_total_without_vat).sum
+  def sum_without_vat
+    items.map(&:item_sum_without_vat).sum
   end
 
-  def total_vat
-    total_without_vat * vat_prc
+  def vat
+    sum_without_vat * vat_prc
   end
 
-  def total
-    total_without_vat + total_vat
+  def sum
+    sum_without_vat + vat
   end
 end

app/models/invoice_item.rb

@@ -1,7 +1,7 @@
 class InvoiceItem < ActiveRecord::Base
   belongs_to :invoice
 
-  def item_total_without_vat
+  def item_sum_without_vat
     amount * price
   end
 end

app/models/registrar.rb

@@ -5,11 +5,13 @@ class Registrar < ActiveRecord::Base
   has_many :contacts, dependent: :restrict_with_error
   has_many :api_users, dependent: :restrict_with_error
   has_many :messages
-  belongs_to :country_deprecated, foreign_key: :country_id
   has_many :invoices, foreign_key: 'buyer_id'
+  has_many :accounts
+
+  belongs_to :country_deprecated, foreign_key: :country_id
 
   validates :name, :reg_no, :country_code, :email, presence: true
-  validates :name, :reg_no, uniqueness: true
+  validates :name, :reg_no, :reference_no, uniqueness: true
   validate :set_code, if: :new_record?
 
   before_create :generate_iso_11649_reference_no
@@ -99,6 +101,10 @@ class Registrar < ActiveRecord::Base
     )
   end
 
+  def cash_account
+    accounts.find_by(account_type: Account::CASH)
+  end
+
   def domain_transfers
     at = DomainTransfer.arel_table
     DomainTransfer.where(