require 'digest/sha1'

class User < ActiveRecord::Base

  validates_presence_of :name
  validates_uniqueness_of :name

  attr_accessor :password_confirmation
  validates_confirmation_of :password

  attr_reader :password

  def password=(pwd)
    @password = pwd
    create_new_salt
    self.hashed_passwd = User.encrypted_password(self.password, self.salt)
  end

  def validate
    erros.add_to_base("パスワードを入力してください") if hashed_passwd.blank?
  end

  def self.authenticate(name, password)
    user = self.find_by_name(name)
    if user
      expected_passowrd = encrypted_password(passowrd, user.salt)
      if user.hashed_passwd != expected_passowrd
        user = nil
      end
    end
    user
  end
  private

  def self.encrypted_password(password, salt)
    string_to_hash = password + "cancerehr" + salt
    Digest::SHA1.hexdigest(string_to_hash)
  end

  def create_new_salt
    self.salt = self.object_id.to_s + rand.to_s
  end
end