class Pettycash < ActiveRecord::Base
  include Money
  belongs_to :business_day
  validates_presence_of :amount
  validates_presence_of :reason
  validates_presence_of :account1
  validates_presence_of :account2
  before_create :not_zero
  validate :must_not_have_discrepancy

  named_scope :positive, :conditions => 'amount > 0'
  named_scope :negative, :conditions => 'amount < 0'

  def not_zero
    amount != 0
  end

  SafeBalance::SIZES.each do |f|
    define_method("out_#{f}=") {|amount| write_attribute "out_#{f}".to_sym, dollars_to_cents(amount)}
    define_method("in_#{f}=") {|amount| write_attribute "in_#{f}".to_sym, dollars_to_cents(amount)}
    define_method("spent_#{f}") {send("out_#{f}") - send("in_#{f}")}
  end

  def amount=(amount)
    write_attribute :amount, dollars_to_cents(amount)
  end

  def out_total
    out_hundreds + out_fifties + out_twenties + out_tens + out_fives + out_ones + out_quarters + out_dimes + out_nickels + out_pennies
  end

  def in_total
    in_hundreds + in_fifties + in_twenties + in_tens + in_fives + in_ones + in_quarters + in_dimes + in_nickels + in_pennies
  end

  def  total
    out_total - in_total
  end

  def discrepancy?
    total != amount
  end

  protected

  def must_not_have_discrepancy
    errors.add("amount", "does not match totals given.") if discrepancy?
  end
end