require 'koala'

module FacebookRails

  class Engine < Rails::Engine

    initializer "facebook_rails.load_app_instance_data" do |app|
      FacebookRails.setup do |config|
        config.app_root = app.root
        config.app_env = Rails.env
      end
    end

    initializer "facebook_rails.facebook" do
      begin
        ::FACEBOOK = YAML.load_file(FacebookRails.app_root.join("config/facebook.yml"))[FacebookRails.app_env]
        FACEBOOK.default = ''
      rescue Exception => e
        warn "WARNING: config/facebook.yml could not be loaded or a configuration is missing. Please run 'rails generate facebook_rails'."
        ::FACEBOOK = {}
        FACEBOOK.default = ''
      end

      ::Koala.http_service.http_options[:timeout] = FACEBOOK[:timeout].to_i unless FACEBOOK[:timeout].blank?

      ::Koala::Facebook::OAuth.class_eval do
        def initialize_with_default_settings(*args)
          case args.size
            when 0, 1
              raise "application id and/or secret are not specified in the config" unless FACEBOOK['app_id'] && FACEBOOK['secret_key']
              initialize_without_default_settings(FACEBOOK['app_id'].to_s, FACEBOOK['secret_key'].to_s, args.first)
            when 2, 3
              initialize_without_default_settings(*args)
          end
        end

        alias_method_chain :initialize, :default_settings
      end
    end

    initializer "facebook_rails.facebook_post_patch" do
      Rails::Rack::Logger.class_eval do
        def call_with_post_override(env)
          if env["REQUEST_METHOD"]=="POST" and ((env["HTTP_REFERER"] and env["HTTP_REFERER"].to_s =~ /:\/\/[^\/]*facebook.com/) or
                                                (env["HTTP_ORIGIN"]  and env["HTTP_ORIGIN"].to_s  =~ /:\/\/[^\/]*facebook.com/))
            env["REQUEST_METHOD"]="GET"
            info "\n**FACEBOOK POST CHANGED TO GET**"
          end
          call_without_post_override(env)
        end

        alias_method :call_without_post_override, :call
        alias_method :call, :call_with_post_override
      end
    end

    initializer "facebook_rails.application_controller" do
      ActionController::Base.send :include, FacebookRailsController

      ActionController::Base.send :helper_method, :facebook_href
      ActionController::Base.send :helper_method, :direct_href
      ActionController::Base.send :helper_method, :current_user_f8id
      ActionController::Base.send :helper_method, :get_facebook_locale
    end

    initializer "facebook_rails.application_helper" do
      ActionView::Base.send :include, FacebookRailsHelper
    end
  end
end