# 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/>.

# == Schema Information
#
# Table name: terraform_aws_backends
#
#  id                    :integer          not null, primary key
#  label                 :string
#  aws_region            :string
#  aws_access_key_id     :string
#  aws_secret_access_key :string
#  created_at            :datetime         not null
#  updated_at            :datetime         not null
#  domain                :string
#  route_53_zone_id      :string           not null
#  vpc_id                :string           not null
#  ssh_public_key        :string
#  ssh_private_key       :string
#

require 'ruby_terraform'

class Backends::TerraformAws < ApplicationRecord
  include MiniEnvironmentMethods
  include BackendMethods

  has_many :mini_environments, as: :backend

  self.table_name = 'terraform_aws_backends'

  def self.label
    'Amazon Web Services'
  end

  def self.available?
    File.exist? "#{ENV['PATH'].split(':').first}/terraform-provider-aws"
  end

  def type_and_id
    "#{self.class.name}=#{id}"
  end

  def common_terraform_variables
    {
      aws_access_key: aws_access_key_id,
      aws_secret_key: aws_secret_access_key,
      aws_region: aws_region,
      ssh_private_key: ssh_private_key,
      aws_route_53_zone_id: route_53_zone_id
    }
  end

  def build_remote_host
    RemoteHost.new(
      'ubuntu',
      backend_latest_terraform_state.output_value('guix_daemon_public_dns'),
      ssh_private_key
    )
  end

  def terraform_state_id
    "backend/terraform_aws/#{id}"
  end

  def guix_public_key
    "(entry #{File.read("/etc/guix/signing-key.pub")} (tag (guix import)))"
  rescue Errno::ENOENT
    # This is optional, as if it doesn't exist, it means that `guix
    # copy` won't be used
    ''
  end
end