class Api::V1::PostsController < Api::V1::ApplicationController

  before_action :permit_params,:get_post,  only: [:create]
  before_action :load_post, only: [:add_viewed_times]

  after_action :process_post, only: :create

  POST_TYPE = {
    :ARTICLE => 'article',
    :WEB_PAGE => 'web_page'
  }

  def create
    if @current_user.share_instances.where(sharable: @post).empty?
      share_instance = @current_user.share_instances.create! sharable: @post, description: params[:description]
      render json: share_instance.to_json(include: :sharable)
    else
      render json: {message: '请勿重复分享同一资源'}, status: 409
    end
  end

  def show
  end

  def index
    render json: @current_user.share_instances.page(params[:page]), each_serializer: ShareInstanceSerializer
  end

  def add_viewed_times
    @target_post.increment!(:viewed_times)
    render nothing: true
  end

  def liked_posts
    ids = Like.where(user_id: @current_user.id).order(:created_at).pluck(:likable_id)
    render json: Post.where(id: ids).page(params[:page]), each_serializer: PostSerializer
  end

  private

  def permit_params
    params.permit(:url, :type, :description)
  end

  def get_post
    begin
      @post = Post.find_or_create_by!(url: params[:url], type: params[:type])
    rescue ActiveRecord::RecordInvalid
      return render json: {msg: '缺少参数，校验失败'}, status: 400
    end

  end

  def process_post
    unless @post.processed
      ProcessPostWorker.perform_async @post.url
    end
  end
end