require 'digest/sha1'
require 'base64'
class User < ActiveRecord::Base
   # Virtual attribute for the unencrypted password
   attr_accessor :password
   has_many :my_maps, :dependent => :destroy
   has_many :maps, :through => :my_maps, :uniq => true
   has_many :layers

   validates_presence_of     :login, :email
   validates_presence_of     :password,                   :if => :password_required?
   validates_presence_of     :password_confirmation,      :if => :password_required?
   validates_length_of       :password, :within => 4..40, :if => :password_required?
   validates_confirmation_of :password,                   :if => :password_required?
   validates_length_of       :login,    :within => 3..40
   validates_length_of       :email,    :within => 6..100
   validates_uniqueness_of   :login, :email, :case_sensitive => false
   validates_format_of       :email, :with => /(^([^@\s]+)@((?:[-_a-z0-9]+\.)+[a-z]{2,})$)|(^$)/i

   has_many :permissions
   has_many :roles, :through => :permissions
  
   before_save :encrypt_password
   before_create :make_activation_code

   # prevents a user from submitting a crafted form that bypasses activation
   # anything else you want your user to change should be added here.
   attr_accessible :login, :email, :password, :password_confirmation

   class ActivationCodeNotFound < StandardError; end
   class AlreadyActivated < StandardError
      attr_reader :user, :message;
      def initialize(user, message=nil)
         @message, @user = message, user
      end
   end

    def own_maps
      Map.find(:all, :conditions => ["owner_id = ?", self.id])
    end

    def own_this_map?(map)
      Map.exists?(:id => map, :owner_id => self.id)
    end

    def own_this_layer?(layer)
      Layer.exists?(:id => layer, :user_id => self.id)
    end

   # Finds the user with the corresponding activation code, activates their account and returns the user.
   #
   # Raises:
   #  +User::ActivationCodeNotFound+ if there is no user with the corresponding activation code
   #  +User::AlreadyActivated+ if the user with the corresponding activation code has already activated their account
   def self.find_and_activate!(activation_code)
      raise ArgumentError if activation_code.nil?
      user = find_by_activation_code(activation_code)
      raise ActivationCodeNotFound if !user
      raise AlreadyActivated.new(user) if user.active?
      user.send(:activate!)
      user
   end

   def active?
      # the presence of an activation date means they have activated
      !activated_at.nil?
   end

   # Returns true if the user has just been activated.
   def pending?
      @activated
   end

   # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
   # Updated 2/20/08
   def self.authenticate(email, password)
      u = find :first, :conditions => ['email = ? and activated_at IS NOT NULL', email]
      u && u.authenticated?(password) ? u : nil
   end

   # Encrypts some data with the salt.
   def self.encrypt(password)
     # Digest::SHA1.hexdigest("–#{salt}–#{password}–")
      '{SHA}'+ Base64.encode64(Digest::SHA1.digest(password))
   end

   # Encrypts the password with the user salt
   def encrypt(password)
      self.class.encrypt(password)
   end

   def authenticated?(password)
      crypted_password == encrypt(password)
   end

   def remember_token?
      remember_token_expires_at && Time.now.utc < remember_token_expires_at
   end

   # These create and unset the fields required for remembering users between browser closes
   def remember_me
      remember_me_for 2.weeks
   end

   def remember_me_for(time)
      remember_me_until time.from_now.utc
   end

   def remember_me_until(time)
      self.remember_token_expires_at = time
      self.remember_token            = encrypt("#{email}–#{remember_token_expires_at}")
      save(false)
   end

   def forget_me
      self.remember_token_expires_at = nil
      self.remember_token            = nil
      save(false)
   end

   def forgot_password
      @forgotten_password = true
      self.make_password_reset_code
   end

   def reset_password
      # First update the password_reset_code before setting the
      # reset_password flag to avoid duplicate email notifications.
      update_attribute(:password_reset_code, nil)
      @reset_password = true
   end

   # used in user_observer
   def recently_forgot_password?
      @forgotten_password
   end

   def recently_reset_password?
      @reset_password
   end

   def self.find_for_forget(email)
      find :first, :conditions => ['email = ? and activated_at IS NOT NULL', email]
   end

   def has_role?(name)
      self.roles.find_by_name(name) ? true : false
   end

#outside of protected and private scope, so an admin can force activate a user
   def force_activate!
     @activated  = true
     self.update_attribute(:activated_at, Time.now.utc)
   end


   protected

   # before filter
   def encrypt_password
      return if password.blank?
    #  self.salt = Digest::SHA1.hexdigest("–#{Time.now.to_s}–#{login}–") if new_record?
      self.crypted_password = encrypt(password)
   end

   def password_required?
      crypted_password.blank? || !password.blank?
   end

   def make_activation_code
      self.activation_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
   end

   def make_password_reset_code
      self.password_reset_code = Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )
   end

   
   private

   def activate!
      @activated = true
      self.update_attribute(:activated_at, Time.now.utc)
   end

end