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require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/slice'

module ActiveModel
  # == Active Model Serialization
  #
  # Provides a basic serialization to a serializable_hash for your object.
  #
  # A minimal implementation could be:
  #
  # class Person
  #
  # include ActiveModel::Serialization
  #
  # attr_accessor :name
  #
  # def attributes
  # @attributes ||= {'name' => 'nil'}
  # end
  #
  # end
  #
  # Which would provide you with:
  #
  # person = Person.new
  # person.serializable_hash # => {"name"=>nil}
  # person.name = "Bob"
  # person.serializable_hash # => {"name"=>"Bob"}
  #
  # You need to declare some sort of attributes hash which contains the attributes
  # you want to serialize and their current value.
  #
  # Most of the time though, you will want to include the JSON or XML
  # serializations. Both of these modules automatically include the
  # ActiveModel::Serialization module, so there is no need to explicitly
  # include it.
  #
  # So a minimal implementation including XML and JSON would be:
  #
  # class Person
  #
  # include ActiveModel::Serializers::JSON
  # include ActiveModel::Serializers::Xml
  #
  # attr_accessor :name
  #
  # def attributes
  # @attributes ||= {'name' => 'nil'}
  # end
  #
  # end
  #
  # Which would provide you with:
  #
  # person = Person.new
  # person.serializable_hash # => {"name"=>nil}
  # person.to_json # => "{\"name\":null}"
  # person.to_xml # => "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<serial-person...
  #
  # person.name = "Bob"
  # person.serializable_hash # => {"name"=>"Bob"}
  # person.to_json # => "{\"name\":\"Bob\"}"
  # person.to_xml # => "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<serial-person...
  module Serialization
    def serializable_hash(options = nil)
      options ||= {}

      options[:only] = Array.wrap(options[:only]).map { |n| n.to_s }
      options[:except] = Array.wrap(options[:except]).map { |n| n.to_s }

      attribute_names = attributes.keys.sort
      if options[:only].any?
        attribute_names &= options[:only]
      elsif options[:except].any?
        attribute_names -= options[:except]
      end

      method_names = Array.wrap(options[:methods]).inject([]) do |methods, name|
        methods << name if respond_to?(name.to_s)
        methods
      end

      (attribute_names + method_names).inject({}) { |hash, name|
        hash[name] = send(name)
        hash
      }
    end
  end
end
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