require 'digest/sha2'

class User < ActiveRecord::Base
  before_save :encrypt_password

  validates_length_of :username, :within => 3..100
  validates_presence_of :password, :on => :create
  validates_uniqueness_of :username
  validates_confirmation_of :password
  validates_length_of :first_name, :maximum => 100, :allow_nil => true
  validates_length_of :last_name, :maximum => 100, :allow_nil => true
  validates_length_of :email, :maximum => 100, :allow_nil => true

  def self.login(username, password)
    return nil if password.empty?
     find(:first, :conditions => ['username = ? AND password = ? AND active=1', username, Digest::SHA256.hexdigest(password)] )
  end

  def password=(val)
    self[:password] = val unless val.blank?
  end

  private
  def encrypt_password
    unless self.password.nil? || self.password.length == 64
      self.password = Digest::SHA256.hexdigest(self.password)
    end
  end

end