# frozen_string_literal: true

# == Schema Information
#
# Table name: post_pastes
#
#  id               :bigint           not null, primary key
#  file             :text
#  file_name_cache  :text
#  file_size_bytes  :integer
#  orig_sha512_hash :text
#  sha512_hash      :text
#  word_count       :integer
#  created_at       :datetime         not null
#  updated_at       :datetime         not null
#  post_id          :integer
#
# Indexes
#
#  index_post_pastes_on_orig_sha512_hash  (orig_sha512_hash) UNIQUE
#  index_post_pastes_on_sha512_hash       (sha512_hash) UNIQUE
#
# Foreign Keys
#
#  fk_rails_...  (post_id => posts.id)
#
class Post::Paste < ActiveRecord::Base
  belongs_to :post, inverse_of: :paste
  belongs_to :thumbnail, class_name: 'Post', inverse_of: nil, optional: true # This is gross.
  # validates :orig_sha512_hash, uniqueness: true
  validates :file, presence: { unless: ->(image) { image.post&.destroyed_content? } }
  validates_with ImageHashDuplicationValidator, on: :create

  mount_uploader :file, TextUploader
  delegate :pretty_url, :url, to: :file

  after_commit do |paste|
    next if paste.post.disable_processing

    if paste.file.previously_changed?
      ProcessPasteJob.perform_later(paste.id)
    end
  end

  def auto_curated_tags
    []
  end

  def file_name(truncated = false)
    return id.to_s if truncated
    return file_name_cache if file_name_cache

    # Not set? Let's build.
    # Trunate filename to 150 characters, making room for the path + filename on Windows - https://stackoverflow.com/questions/265769/maximum-filename-length-in-ntfs-windows-xp-and-windows-vista
    fn = "#{post.id}__#{Tag.where(id: post.tag_ids).display_order.pluck(:slug).join('_')}".gsub('%2F', '').delete('/')[0..150].sub(/%\h?\z/, '') rescue id.to_s
    update_columns(file_name_cache: fn)

    fn
  end

  def url(version = nil, hidden: false)
    file.url(version, hidden: hidden)
  end

  def as_indexed_json(*)
    {
      sha512_hash: sha512_hash,
      orig_sha512_hash: orig_sha512_hash,
      mime_type: 'text/plain',
      text: (body_reader.read rescue '')
    }
  end

  def body_reader
    fp = File.open(file.path)

    yield fp if block_given?

    fp
  end
end