class MakeRestful::Specification::Builder

  attr_reader :_controller_, :_methods_, :_description_, :_formats_, :_attributes_, :_resource_, :_default_methods_, :_default_attributes_, :_default_formats_

  private

  def initialize(controller, &block)
    @_controller_ = controller
    @_methods_ = []
    @_default_methods_ = default_supported_methods
    @_methods_ = []
    @_attributes_ = []
    @_default_attributes_ = controller.resource_class.new.attributes.keys
    @_default_formats_ = controller.allowed_formats
    @_formats_ = []
    @_description_ = "Api for #{controller.resource_name.titleize}"
    @_resource_ = controller.instance_name
    instance_eval(&block) if block_given?
  end

  def method(method, options={})
    method = {
      method:   method,
      path:     options[:path],
      returns:  options[:returns]
    }
    @_methods_ << method
    method
  end

  def description(string)
    @_description_ = string
  end

  def resource(string)
    @_resource_ = string
  end

  def attribute(attr)
    @_attributes_ << attr
    attr
  end

  def attributes(*args)
    @_attributes_ += args.flatten
  end

  def format(attr)
    @_formats_ << attr
    attr
  end

  def formats(*args)
    @_formats_ += args
  end

  def default_supported_methods
    method  :get,     path: "/",        returns: "collection" if _controller_.allow_method?(:list)    || _controller_.allow_method?(:index)
    method  :post,    path: "/",        returns: "resource"   if _controller_.allow_method?(:create)  || _controller_.allow_method?(:post)
    method  :get,     path: "/:id",     returns: "resource"   if _controller_.allow_method?(:show)    || _controller_.allow_method?(:get)
    method  :put,     path: "/:id",     returns: "resource"   if _controller_.allow_method?(:update)  || _controller_.allow_method?(:put)
    method  :delete,  path: "/:id",     returns: "success"    if _controller_.allow_method?(:destroy) || _controller_.allow_method?(:delete)
  end

  def render
    {
      resource:     _resource_,
      formats:      _formats_.present? ? _formats_ : _default_formats_,
      description:  _description_,
      attributes:   _attributes_.present? ? _attributes_ : _default_attributes_,
      methods:      _methods_.present? ? _methods_ : _default_methods_
    }
  end

end