require 'digest/sha1'
 
class Member
  attr_reader :password
  
  def password=(password)
    self.hashed_password = self.class.hash_password(password)
  end
  
  def self.hash_password(password)
    ::Digest::SHA1.hexdigest(password)
  end
  
  # Authenticates credentials. Takes a hash with a :email and :password, returns an instance of Member.
  # The Member has errors on base when the user isn't authenticated.
  def self.authenticate(params={})
    unless member = find_by_email_and_hashed_password(params[:email], hash_password(params[:password]))
      member = Member.new
      member.errors.add_to_base("Login failed; please check email and password and try again.")
      member
    else
      member
    end
  end
end