require 'fileutils'

module Backends::Terraform
  def working_directory(mini_environment)
    "tmp/terraform-working-directories/#{mini_environment.name}"
  end

  def with_terraform(mini_environment, source)
    source = File.expand_path(source)
    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: terraform_plugin_dir
        )
      end

      yield
    end
  end

  def terraform_backend_address(mini_environment)
    (
      'http://localhost:3000' +
      Rails
        .application
        .routes
        .url_helpers
        .mini_environment_terraform_http_backend_path(
          mini_environment
        )
    )
  end

  def terraform_plugin_dir
    ENV['PATH'].split(':').first
  end
end