class RailsApp
  def initialize(name, path, options = {})
    @name = name
    @path = File.expand_path("../../railsapps/#{path}", __FILE__)
    @runner = options.fetch(:runner)
    @using_asset_pipeline = options.fetch(:asset_pipeline)
    @digests = options.fetch(:digests)
    @sprockets = options[:sprockets]
    reset
  end

  def to_s() @name end
  def using_asset_pipeline?() @using_asset_pipeline end
  def digested?() @digests end
  def sprockets3_or_later?() @sprockets && @sprockets >= 3 end

  def read_email(mail_name)
    result = run("puts Mailer.#{mail_name}.to_s")
    raise "No email returned. Did the rails application crash?" if result.strip.empty?
    Mail.read_from_string(result)
  end

  def read_delivered_email(mail_name, options = {})
    deliver = options[:force_delivery] ? "deliver!" : "deliver"
    result = run("mail = AutoMailer.#{mail_name}; mail.delivery_method(:test); mail.#{deliver}; puts mail.to_s")
    raise "No email returned. Did the rails application crash?" if result.strip.empty?
    Mail.read_from_string(result)
  end

  def read_providers
    result = run(<<-RUBY).strip
      providers = Rails.application.config.roadie.asset_providers
      puts providers.map { |p| p.class.name }.join(',')
    RUBY
    raise "No output present. Did the application crash?" if result.empty?
    result.split(",")
  end

  def reset
    @extra_code = ""
    run_in_app_context 'rm -rf tmp/cache'
  end

  def before_mail(code)
    @extra_code << "\n" << code << "\n"
  end

  private
  def run(code)
    Tempfile.open('code') do |file|
      file << @extra_code unless @extra_code.empty?
      file << code
      file.close
      run_file_in_app_context file.path
    end
  end

  def run_file_in_app_context(file_path)
    run_in_app_context "#{runner_script} #{file_path.shellescape}"
  end

  def run_in_app_context(command)
    Bundler.with_clean_env do
      Dir.chdir @path do
        IO.popen(command).read
      end
    end
  end

  def runner_script
    case @runner
    when :script then "script/rails runner"
    when :bin then "bin/rails runner"
    else raise "Unknown runner type: #{@runner}"
    end
  end
end