require 'rack/core-data'

class Helios::Backend::Data < Sinatra::Base
  use Rack::PostBodyContentTypeParser

  def initialize(xcdatamodel)
    super(Rack::CoreData(xcdatamodel))

    @model = Rack::CoreData::DataModel.new(xcdatamodel)
  end

  before do
    content_type :json
  end

  helpers Sinatra::Param

  options '/' do
    pass unless settings.frontend rescue false
    
    links = []
    @model.entities.each do |entity|
      links << %{</#{entity.name.downcase.pluralize}>; rel="resource"}
    end

    response['Link'] = links.join("\n")

    @model.entities.collect{ |entity| 
      {
        name: entity.name, 
        url: "/#{entity.name.downcase.pluralize}",
        attributes: Hash[entity.attributes.collect{|attribute| [attribute.name, attribute.type]}]
      }
    }.to_json
  end
end