require 'dragonfly'
require 'rack/cache'
require 'refinerycms-core'

module Refinery
  module Resources

    class << self
      attr_accessor :root
      def root
        @root ||= Pathname.new(File.expand_path('../../', __FILE__))
      end
    end

    class Engine < ::Rails::Engine

      initializer 'serve static assets' do |app|
        app.middleware.insert_after ::ActionDispatch::Static, ::ActionDispatch::Static, "#{root}/public"
      end

      initializer 'resources-with-dragonfly' do |app|
        app_resources = Dragonfly[:resources]
        app_resources.configure_with(:rails) do |c|
          c.datastore.root_path = Rails.root.join('public', 'system', 'resources').to_s
          # This url_format makes it so that dragonfly urls work in traditional
          # situations where the filename and extension are required, e.g. lightbox.
          # What this does is takes the url that is about to be produced e.g.
          # /system/images/BAhbB1sHOgZmIiMyMDEwLzA5LzAxL1NTQ19DbGllbnRfQ29uZi5qcGdbCDoGcDoKdGh1bWIiDjk0MngzNjAjYw
          # and adds the filename onto the end (say the file was 'refinery_is_awesome.pdf')
          # /system/images/BAhbB1sHOgZmIiMyMDEwLzA5LzAxL1NTQ19DbGllbnRfQ29uZi5qcGdbCDoGcDoKdGh1bWIiDjk0MngzNjAjYw/refinery_is_awesome.pdf
          c.url_format = '/system/resources/:job/:basename.:format'
          c.secret = RefinerySetting.find_or_set(:dragonfly_secret,
                                                 Array.new(24) { rand(256) }.pack('C*').unpack('H*').first)
        end

        if Refinery.s3_backend
          app_resources.configure_with(:heroku, ENV['S3_BUCKET'])
          # Dragonfly doesn't set the S3 region, so we have to do this manually
          app_resources.datastore.configure do |d|
            d.region = ENV['S3_REGION'] if ENV['S3_REGION'] # defaults to 'us-east-1'
          end
        end

        app_resources.define_macro(ActiveRecord::Base, :resource_accessor)
        app_resources.analyser.register(Dragonfly::Analysis::FileCommandAnalyser)
        app_resources.content_disposition = :attachment

        ### Extend active record ###

        app.config.middleware.insert_after 'Rack::Lock', 'Dragonfly::Middleware', :resources

        app.config.middleware.insert_before 'Dragonfly::Middleware', 'Rack::Cache', {
          :verbose     => Rails.env.development?,
          :metastore   => "file:#{Rails.root.join('tmp', 'dragonfly', 'cache', 'meta')}",
          :entitystore => "file:#{Rails.root.join('tmp', 'dragonfly', 'cache', 'body')}"
        }
      end

      config.after_initialize do
        ::Refinery::Plugin.register do |plugin|
          plugin.pathname = root
          plugin.name = 'refinery_files'
          plugin.url = {:controller => '/admin/resources', :action => 'index'}
          plugin.menu_match = /(refinery|admin)\/(refinery_)?(files|resources)$/
          plugin.version = %q{1.0.0}
          plugin.activity = {
            :class => Resource
          }
        end
      end
    end
  end
end

::Refinery.engines << 'resources'