class Usher
  module Interface
    class Rails2_3Interface
      
      attr_reader :configuration_files
      
      def named_routes
        @router.named_routes
      end
      
      def add_named_route(name, route, options = {})
        @router.add_route(route, options).name(name)
      end

      def add_route(path, options = {})
        if !@controller_action_route_added && path =~ %r{^/?:controller/:action/:id$}
          add_route('/:controller/:action', options.dup)
          @controller_action_route_added = true 
        end

        if !@controller_route_added && path =~ %r{^/?:controller/:action$}
          add_route('/:controller', options.merge({:action => 'index'}))
          @controller_route_added = true 
        end
        
        options[:action] = 'index' unless options[:action]

        path[0, 0] = '/' unless path[0] == ?/
        route = @router.add_route(path, options).to(options)
        
        raise "your route must include a controller" unless (route.paths.first.dynamic_keys.include?(:controller) || route.destination.include?(:controller))
        route
      end
      
      def initialize
        reset!
      end
      
      def add_configuration_file(file)
        @configuration_files << file
      end
      
      def reload!
        if configuration_files.any?
          configuration_files.each { |config| load(config) }
        else
          add_route ":controller/:action/:id"
        end
        
      end
      alias_method :reload, :reload!

      def route_count
        routes.size
      end

      def routes
        @router.routes
      end

      def call(env)
        request = ActionController::Request.new(env)
        app = recognize(request)
        app.call(env).to_a
      end
      
      def recognize(request)
        response = @router.recognize(request)
        request.path_parameters = (response.params.empty? ? response.path.route.destination : response.path.route.destination.merge(response.params.inject({}){|h,(k,v)| h[k]=v; h })).with_indifferent_access
        response.params.each { |pair| request.path_parameters[pair.first] = pair.last }
        "#{request.path_parameters[:controller].camelize}Controller".constantize
      end
      
      def reset!
        @router = Usher.new
        @url_generator = Usher::Generators::URL.new(@router)
        @configuration_files = []
        @module ||= Module.new
        @controller_route_added = false
        @controller_action_route_added = false
      end
      
      def draw
        reset!
        yield ActionController::Routing::RouteSet::Mapper.new(self)
        install_helpers
      end
      
      def install_helpers(destinations = [ActionController::Base, ActionView::Base], regenerate_code = false)
        #*_url and hash_for_*_url
        Array(destinations).each do |d| d.module_eval { include Helpers } 
          @router.named_routes.keys.each do |name|
            @module.module_eval <<-end_eval # We use module_eval to avoid leaks
              def #{name}_url(options = {})
                ActionController::Routing::UsherRoutes.generate(options, {}, :generate, :#{name})
              end
            end_eval
          end
          d.__send__(:include, @module)
        end
      end

      def generate(options, recall = {}, method = :generate, route_name = nil)
        route = if(route_name)
          @router.named_routes[route_name]
        else
          merged_options = options
          merged_options[:controller] = recall[:controller] unless options.key?(:controller)
          unless options.key?(:action)
            options[:action] = ''
          end
          path_for_options(merged_options)
        end
        case method
        when :generate
          merged_options ||= recall.merge(options)
          url = generate_url(route, merged_options)
          url.slice!(-1) if url[-1] == ?/
          url 
        else
          raise "method #{method} not recognized"
        end
      end
      
      def generate_url(route, params)
        @url_generator.generate(route, params)
      end
      
      def path_for_options(options)
        @router.path_for_options(options)
      end
      
    end
  end
end