class LegalDocument < ApplicationRecord # rubocop:disable Metrics/ClassLength
  include EppErrors
  MIN_BODY_SIZE = (1.37 * 3.kilobytes).ceil
  MAX_BODY_SIZE = 8.megabytes

  if ENV['legal_document_types'].present?
    TYPES = ENV['legal_document_types'].split(',').map(&:strip)
  else
    TYPES = %w(pdf asice asics sce scs adoc edoc bdoc ddoc zip rar gz tar 7z odt
               doc docx).freeze
  end

  attr_accessor :body

  belongs_to :documentable, polymorphic: true

  validate :val_body_length, if: ->(file) { file.path.blank? && (Rails.env.production? || Rails.env.test?) }

  before_create :add_creator
  before_save   :save_to_filesystem, if: :body

  def epp_code_map
    {
      '2308' => [
        %i[body length_more_than],
        %i[body length_less_than],
      ],
    }
  end

  def val_body_length
    if body.nil? || body.size < MIN_BODY_SIZE
      errors.add(:body, :length_more_than)
    elsif body.size > MAX_BODY_SIZE
      errors.add(:body, :length_less_than)
    end
  end

  def save_to_filesystem
    binary = Base64.decode64(body)
    digest = Digest::SHA1.new.update(binary).to_s

    loop do
      rand = SecureRandom.random_number.to_s.last(4)
      next if rand.to_i.zero? || rand.length < 4

      dir = "#{ENV['legal_documents_dir']}/#{Time.zone.now.strftime('%Y/%m/%d')}"
      FileUtils.mkdir_p(dir, mode: 0775)
      self.path = "#{dir}/#{Time.zone.now.to_formatted_s(:number)}_#{rand}.#{document_type}"
      break unless File.file?(path)
    end

    File.open(path, 'wb') { |f| f.write(binary) } unless Rails.env.test?
    self.path = path
    self.checksum = digest
  end

  def calc_checksum
    digest = Digest::SHA1.new
    digest.update File.binread(path)
    digest.to_s
  end

  def add_creator
    self.creator_str = ::PaperTrail.request.whodunnit
    true
  end

  def self.remove_duplicates
    start = Time.zone.now.to_f
    Rails.logger.info '-----> Removing legal documents duplicates'
    count = 0
    modified = []

    LegalDocument.where(documentable_type: 'Domain')
                 .where.not(checksum: [nil, ''])
                 .find_each do |orig_legal|
      next if modified.include?(orig_legal.checksum)
      next unless File.exist?(orig_legal.path)

      modified.push(orig_legal.checksum)

      LegalDocument.where(documentable_type: 'Domain', documentable_id: orig_legal.documentable_id)
                   .where(checksum: orig_legal.checksum)
                   .where.not(id: orig_legal.id)
                   .where.not(path: orig_legal.path).each do |new_legal|
        next if modified.include?(orig_legal.id)

        File.delete(new_legal.path) if File.exist?(new_legal.path)
        new_legal.update(path: orig_legal.path)
        count += 1
        Rails.logger.info "File #{new_legal.path} has been removed by Domain "\
                          "#{new_legal.documentable_id}. Document id: #{new_legal.id}"
      end

      contact_ids = Version::DomainVersion.where(item_id: orig_legal.documentable_id).distinct
                                          .pluck("object->>'registrant_id'",
                                                 "object_changes->>'registrant_id'",
                                                 "children->>'tech_contacts'",
                                                 "children->>'admin_contacts'")
                                          .flatten.uniq
      contact_ids = contact_ids.map do |id|
        case id
        when Hash
          id['id']
        when String
          JSON.parse(id) rescue id.to_i
        else
          id
        end
      end.flatten.compact.uniq
      LegalDocument.where(documentable_type: 'Contact', documentable_id: contact_ids)
                   .where(checksum: orig_legal.checksum)
                   .where.not(path: orig_legal.path).each do |new_legal|
        next if modified.include?(orig_legal.id)

        File.delete(new_legal.path) if File.exist?(new_legal.path)
        new_legal.update(path: orig_legal.path)
        count += 1
        Rails.logger.info "File #{new_legal.path} has been removed by Contact "\
                          "#{new_legal.documentable_id}. Document id: #{new_legal.id}"
      end
    end
    Rails.logger.info "-----> Duplicates fixed for #{count} rows in #{(Time.zone.now.to_f - start).round(2)} seconds"
  end
end