require 'graphql'
require 'json'
require 'rack'

require 'types/cake'
require 'types/query'
require 'schema'

class Server
  def call(env)
    result = execute(query_for(Rack::Request.new(env)))
    [
      200,
      { 'Content-Type' => 'application/graphql' },
      [ result.to_json ]
    ]
  end

  private

  def execute(query)
    Schema.execute(query)
  end

  def query_for(request)
    request.post? ? request.body.read : request.params['query']
  end
end