# == Schema Information
#
# Table name: terraform_libvirt_backends
#
#  id         :integer          not null, primary key
#  label      :string
#  uri        :string
#  created_at :datetime         not null
#  updated_at :datetime         not null
#

class Backends::TerraformLibvirt < ApplicationRecord
  has_many :mini_environments, as: :backend

  self.table_name = 'terraform_libvirt_backends'

  def self.label
    'libvirt'
  end

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

  def build(mini_environment)
    GovukGuix::GenerateVmImageAndSystemJob.enqueue(
      mini_environment.id
    )
  end

  def start(mini_environment)
    logger.info "Setting up #{mini_environment.name}"

    source = File.expand_path("terraform/libvirt")
    FileUtils.mkdir_p working_directory(mini_environment)

    Dir.chdir(working_directory(mini_environment)) do
      if Dir.empty?(".")
        RubyTerraform.init(
          backend: true,
          from_module: source,
          backend_config: {
            address: terraform_backend_address(mini_environment)
          },
          plugin_dir: plugin_dir
        )
      end

      RubyTerraform.apply(
        vars: terraform_variables(mini_environment),
        auto_approve: true
      )
    end
  end

  def destroy(mini_environment)
    Dir.chdir(working_directory(mini_environment)) do
      RubyTerraform.destroy(
        vars: terraform_variables(mini_environment),
        force: true
      )
    end
  end

  def terraform_variables(mini_environment)
    mini_environment.backend_data.merge(
      uri: uri,
      machine_name: mini_environment.name.parameterize
    )
  end

  def ssh_public_key
    File.open("#{ENV['HOME']}/.ssh/id_rsa.pub") do |file|
      file.readline()
    end
  end
end