module API
  module V1
    class Comments < Grape::API
      before { authenticate! }

      resource :articles do
        # Collect comments from articles
        #
        # Parameters:
        #   reference_id     - comment id used as reference to collect comment
        #   oldest           - Collect the oldest comments from reference_id comment. If nothing is passed the newest comments are collected
        #   limit            - amount of comments returned. The default value is 20
        #
        # Example Request:
        #  GET /articles/12/comments?oldest&limit=10&reference_id=23
        get ":id/comments" do

          conditions = make_conditions_with_parameter(params)
          article = find_article(environment.articles, params[:id])

          if params[:reference_id]
            comments = article.comments.send("#{params.key?(:oldest) ? 'older_than' : 'newer_than'}", params[:reference_id]).reorder("created_at DESC").find(:all, :conditions => conditions, :limit => limit)
          else
            comments = article.comments.reorder("created_at DESC").find(:all, :conditions => conditions, :limit => limit)
          end
          present comments, :with => Entities::Comment

        end

        get ":id/comments/:comment_id" do
          article = find_article(environment.articles, params[:id])
          present article.comments.find(params[:comment_id]), :with => Entities::Comment
        end

        # Example Request:
        #  POST api/v1/articles/12/comments?private_toke=234298743290432&body=new comment
        post ":id/comments" do
          article = find_article(environment.articles, params[:id])
          present article.comments.create(:author => current_person, :body => params[:body]), :with => Entities::Comment
        end
      end

    end
  end
end