# GOV.UK Mini Environment Admin
# Copyright © 2018  Christopher Baines <mail@cbaines.net>
#
# This file is part of the GOV.UK Mini Environment Admin.
#
# The GOV.UK Mini Environment Admin is free software: you can
# redistribute it and/or modify it under the terms of the GNU Affero
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later
# version.
#
# The GOV.UK Mini Environment Admin is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with the GOV.UK Mini Environment Admin.  If not, see
# <http://www.gnu.org/licenses/>.

class GovukGuix::CreateDataSnapshotJob < Que::Job
  extend EnqueuedJobs
  include ::ShellUtils

  @retry_interval = 30

  def enqueue(options = {})
    backend_type = options[:backend_type]
    backend_id = options[:backend_id]

    remote_host = options[:run_remotely_on_host]

    if remote_host
      raise 'backend_type missing' unless backend_type
      raise 'backend_id missing' unless backend_id
    end

    super(options)
  end

  def run(options = {})
    data_snapshot_fields = {}

    backend_type = options[:backend_type]
    backend_id = options[:backend_id]
    if backend_type
      backend = Backends.find_by_type_and_id(backend_type, backend_id)
      data_snapshot_fields[:backend] = backend
    end

    revision_id = options[:revision_id]
    revision = if revision_id
                 GovukGuix::Revision.find(revision_id)
               else
                 GovukGuix::Revision.order(:created_at).first
               end
    data_snapshot_fields[:govuk_guix_revision] = revision

    remote_host = options[:run_remotely_on_host]

    logger.info(self.class) do
      'Creating new data snapshot'
    end

    if remote_host
      # Copy the revision to the remote host, to ensure it's available
      # there
      run_command(
        'guix',
        'copy',
        "--to=#{remote_host}",
        revision.store_path
      )
    end

    output = run_command(
      "#{revision.store_path}/bin/govuk",
      'data',
      'build-snapshot',
      # TODO: Just use a couple of small databases for initial testing
      *%w(content-tagger contacts-admin),
      run_remotely_on_host: remote_host
    )

    build_output = output.last.strip
    logger.debug(self.class) { "build_output: #{build_output}" }
    data_snapshot_fields[:store_path] = build_output

    data_snapshot_fields[:manifest] = read_json_file(
      "#{build_output}/manifest.json",
      from_remote_host: remote_host
    )

    GovukGuix::DataSnapshot.create!(data_snapshot_fields)
  end
end