class Address < ActiveRecord::Base
  has_one :company, :dependent => :destroy
  has_many :people

  validates_presence_of :street_1, 
  :message => "Please enter an initial line for the address"
  
  POSTCODE_REGEX = /^[A-Z][A-Z]?[0-9][A-Z0-9]? ?[0-9][ABDEFGHJLNPQRSTUWXYZ]{2}$/i
  validates_format_of :post_code, :with => POSTCODE_REGEX, 
  :message => "Please enter a valid post code"
  
  def validate_on_create
    if Address.find_by_street_1_and_post_code(street_1, post_code)
      errors.add_to_base('Street address and post code already exist in the database')
    end
  end
  
  # Look up or initialize an address from params if street_1 or post_code supplied;
  # otherwise return nil; NB does not save the address
  def self.from_street_1_and_post_code(params)
    params ||= {}
    street_1 = params[:street_1]
    post_code = params[:post_code]
    if street_1.blank? and post_code.blank?
      address = nil
    else
      address = find_or_initialize_by_street_1_and_post_code(street_1, post_code)
      address.attributes = params
    end
    
    address
  end
end