# frozen_string_literal: true

require 'distributed_press/v1/client/site'
require 'njalla/v1'

# Soportar Distributed Press APIv1
#
# Usa tokens de publicación efímeros para todas las acciones.
#
# Al ser creado, genera el sitio en la instancia de Distributed Press
# configurada y almacena el ID.
#
# Al ser publicado, envía los archivos en un tarball y actualiza la
# información.
class DeployDistributedPress < Deploy
  store :values, accessors: %i[hostname remote_site_id remote_info], coder: JSON

  before_create :create_remote_site!, :create_njalla_records!
  before_destroy :delete_remote_site!, :delete_njalla_records!

  DEPENDENCIES = %i[deploy_local]

  # Actualiza la información y luego envía los cambios
  #
  # @param :output [Bool]
  # @return [Bool]
  def deploy
    status = false
    log = []

    time_start

    create_remote_site! if remote_site_id.blank?
    create_njalla_records!
    save

    if remote_site_id.blank?
      raise DeployJob::DeployException, 'El sitio no se creó en Distributed Press'
    end

    if create_njalla_records? && remote_info[:njalla].blank?
      raise DeployJob::DeployException, 'No se pudieron crear los registros necesarios en Njalla'
    end

    site_client.tap do |c|
      stdout = Thread.new(publisher.logger_out) do |io|
        until io.eof?
          line = io.gets

          puts line if output
          log << line
        end
      end

      begin
        status = c.publish(publishing_site, deploy_local.destination)
      rescue DistributedPress::V1::Error => e
        ExceptionNotifier.notify_exception(e, data: { site: site.name })
        status = false
      end

      if status
        self.remote_info[:distributed_press] = c.show(publishing_site).to_h
        save
      end

      publisher.logger.close
      stdout.join
    end

    time_stop

    create_stat! status, log.join

    status
  end

  def limit; end

  def size
    deploy_local.size
  end

  def destination; end

  # Devuelve las URLs de todos los protocolos
  def urls
    gateway_urls
  end

  private

  # @return [Array]
  def gateway_urls
    remote_info.dig(:distributed_press, :links)&.values&.map do |protocol|
      [ protocol[:link], protocol[:gateway] ]
    end&.flatten&.compact&.select do |link|
      link.include? '://'
    end || []
  end

  # El cliente de la API
  #
  # @return [DistributedPressPublisher]
  def publisher
    @publisher ||=
      if distributed_press_publisher_id
        DistributedPressPublisher.find(distributed_press_publisher_id)
      else
        DistributedPressPublisher.find_by_default(true)
      end
  end

  # El cliente para actualizar el sitio
  #
  # @return [DistributedPress::V1::Client::Site]
  def site_client
    DistributedPress::V1::Client::Site.new(publisher.client)
  end

  # Genera el esquema de datos para poder publicar el sitio
  #
  # @return [DistributedPress::V1::Schemas::PublishingSite]
  def publishing_site
    DistributedPress::V1::Schemas::PublishingSite.new.call(id: remote_site_id)
  end

  # Genera el esquema de datos para crear el sitio
  #
  # @return [DistributedPressPublisher::V1::Schemas::NewSite]
  def create_site
    DistributedPress::V1::Schemas::NewSite.new.call(domain: hostname, protocols: { http: true, ipfs: true, hyper: true })
  end

  # Crea el sitio en la instancia con el hostname especificado
  #
  # @return [nil]
  def create_remote_site!
    created_site = site_client.create(create_site)

    self.remote_site_id = created_site[:id]
    self.remote_info ||= {}
    self.remote_info[:distributed_press] = created_site.to_h
    nil
  rescue DistributedPress::V1::Error => e
    ExceptionNotifier.notify_exception(e, data: { site: site.name })
    nil
  end

  # Crea los registros en Njalla
  #
  # XXX: Esto depende de nuestro DNS actual, cuando lo migremos hay
  # que eliminarlo.
  #
  # @return [nil]
  def create_njalla_records!
    return unless create_njalla_records?

    self.remote_info ||= {}
    self.remote_info[:njalla] ||= {}
    self.remote_info[:njalla][:a]     ||= njalla.add_record(name: site.name, type: 'CNAME', content: "#{Site.domain}.").to_h
    self.remote_info[:njalla][:cname] ||= njalla.add_record(name: "www.#{site.name}", type: 'CNAME', content: "#{Site.domain}.").to_h
    self.remote_info[:njalla][:ns]    ||= njalla.add_record(name: "_dnslink.#{site.name}", type: 'NS', content: "#{publisher.hostname}.").to_h

    nil
  rescue HTTParty::Error => e
    ExceptionNotifier.notify_exception(e, data: { site: site.name })
    self.remote_info.delete :njalla
  ensure
    nil
  end

  # Registra lo que sucedió
  #
  # @param status [Bool]
  # @param log [String]
  # @return [nil]
  def create_stat!(status, log)
    build_stats.create action: publisher.to_s,log: log, seconds: time_spent_in_seconds, bytes: size, status: status
    nil
  end

  def delete_remote_site!
    site_client.delete(publishing_site)
    nil
  rescue DistributedPress::V1::Error => e
    ExceptionNotifier.notify_exception(e, data: { site: site.name })
    nil
  end

  def delete_njalla_records!
    return unless create_njalla_records?

    %w[a ns cname].each do |type|
      next if (id = remote_info.dig('njalla', type, 'id')).blank?

      njalla.remove_record(id: id.to_i)
    end
  end

  # Actualizar registros en Njalla
  #
  # @return [Njalla::V1::Domain]
  def njalla
    @njalla ||=
      begin
        client = Njalla::V1::Client.new(token: Rails.application.credentials.njalla)

        Njalla::V1::Domain.new(domain: Site.domain, client: client)
      end
  end

  # Detecta si tenemos que crear registros en Njalla
  def create_njalla_records?
    !site.name.end_with?('.')
  end
end