module InvoiceBar
  class Invoice < ActiveRecord::Base
    before_validation :update_amount

    attr_accessible :number, :sent, :paid

    validates :number, presence: true
    validate :number_is_unique

    validates :due_date, presence: true

    include InvoiceBar::Billable::Base
    include InvoiceBar::Billable::StrictValidations
    include InvoiceBar::Billable::Invoicing

    include InvoiceBar::Billable::Associations::Base

    belongs_to :receipt

    include InvoiceBar::Billable::Filters

    # This one is contact's address
    has_one :address,
      -> { where(addressable_type: "InvoiceBar::Invoice#contact_address") },
      class_name: InvoiceBar::Address,
      foreign_key: :addressable_id,
      foreign_type: :addressable_type,
      dependent: :destroy,
      required: true
    has_many :items, as: :itemable, dependent: :destroy
    accepts_nested_attributes_for :address, allow_destroy: true, reject_if: false

    has_one :user_address,
      -> { where(addressable_type: "InvoiceBar::Invoice#user_address") },
      class_name: InvoiceBar::Address,
      foreign_key: :addressable_id,
      foreign_type: :addressable_type,
      dependent: :destroy,
      required: true
    accepts_nested_attributes_for :user_address, allow_destroy: true, reject_if: false

    # Search
    include InvoiceBar::Searchable

    def self.searchable_fields
      %w( number contact_name contact_tax_id )
    end

    def mark_as_paid
      self.paid = true
    end

    def mark_as_sent
      self.sent = true
    end

    private

      # Validates uniqueness of a number for current user.
      def number_is_unique
        invoices = Invoice.where(number: number, user_id: user_id)

        if invoices.any? && !invoices.include?(self)
          errors.add(:number, :uniqueness)
        end
      end
  end
end