# frozen_string_literal: true

require 'bcrypt'

module OmniAuth
  module Identity
    # This is taken directly from Rails 3.1 code and is used if
    # the version of ActiveModel that's being used does not
    # include SecurePassword. The only difference is that instead of
    # using ActiveSupport::Concern, it checks to see if there is already
    # a has_secure_password method.
    module SecurePassword
      def self.included(base)
        base.extend ClassMethods unless base.respond_to?(:has_secure_password)
      end

      module ClassMethods
        # Adds methods to set and authenticate against a BCrypt password.
        # This mechanism requires you to have a password_digest attribute.
        #
        # Validations for presence of password, confirmation of password (using
        # a "password_confirmation" attribute) are automatically added.
        # You can add more validations by hand if need be.
        #
        # Example using Active Record (which automatically includes ActiveModel::SecurePassword):
        #
        #   # Schema: User(name:string, password_digest:string)
        #   class User < ActiveRecord::Base
        #     has_secure_password
        #   end
        #
        #   user = User.new(:name => "david", :password => "", :password_confirmation => "nomatch")
        #   user.save                                                      # => false, password required
        #   user.password = "mUc3m00RsqyRe"
        #   user.save                                                      # => false, confirmation doesn't match
        #   user.password_confirmation = "mUc3m00RsqyRe"
        #   user.save                                                      # => true
        #   user.authenticate("notright")                                  # => false
        #   user.authenticate("mUc3m00RsqyRe")                             # => user
        #   User.find_by_name("david").try(:authenticate, "notright")      # => nil
        #   User.find_by_name("david").try(:authenticate, "mUc3m00RsqyRe") # => user
        def has_secure_password
          attr_reader :password

          validates_confirmation_of :password
          validates_presence_of     :password_digest

          include InstanceMethodsOnActivation

          if respond_to?(:attributes_protected_by_default)
            def self.attributes_protected_by_default
              super + ['password_digest']
            end
          end
        end
      end

      module InstanceMethodsOnActivation
        # Returns self if the password is correct, otherwise false.
        def authenticate(unencrypted_password)
          if BCrypt::Password.new(password_digest) == unencrypted_password
            self
          else
            false
          end
        end

        # Encrypts the password into the password_digest attribute.
        def password=(unencrypted_password)
          @password = unencrypted_password
          if unencrypted_password && !unencrypted_password.empty?
            self.password_digest = BCrypt::Password.create(unencrypted_password)
          end
        end
      end
    end
  end
end