class GekanatorPostsController < ApplicationController
  def index
    posts =
        Post
        .preload(tags: :tag_name)
        .with_attached_thumbnail
        .order(Arel.sql(
            'COALESCE(posts.original_created_before - INTERVAL 1 MINUTE, ' \
            'posts.original_created_from, posts.created_at) DESC, posts.id DESC'))

    render json: { posts: posts.map { |post| post_json(post) } }
  end

  private

  def post_json post
    {
      id: post.id,
      url: post.url,
      title: post.title,
      thumbnail: thumbnail_url(post),
      thumbnail_base: post.thumbnail_base,
      original_created_from: post.original_created_from,
      original_created_before: post.original_created_before,
      tags: post.tags.map { |tag| tag_json(tag) }
    }
  end

  def tag_json tag
    {
      id: tag.id,
      name: tag.name,
      category: tag.category
    }
  end

  def thumbnail_url post
    return nil unless post.thumbnail.attached?

    rails_storage_proxy_url(post.thumbnail, only_path: false)
  rescue
    nil
  end
end