module Devise
  # Responsible for handling devise mappings and routes configuration. Each
  # resource configured by devise_for in routes is actually creating a mapping
  # object. You can refer to devise_for in routes for usage options.
  #
  # The required value in devise_for is actually not used internally, but it's
  # inflected to find all other values.
  #
  #   map.devise_for :users
  #   mapping = Devise.mappings[:user]
  #
  #   mapping.name #=> :user
  #   # is the scope used in controllers and warden, given in the route as :singular.
  #
  #   mapping.as   #=> "users"
  #   # how the mapping should be search in the path, given in the route as :as.
  #
  #   mapping.to   #=> User
  #   # is the class to be loaded from routes, given in the route as :class_name.
  #
  #   mapping.for  #=> [:authenticable]
  #   # is the modules included in the class
  #
  class Mapping #:nodoc:
    attr_reader :name, :as, :path_names

    def initialize(name, options)
      @as    = (options[:as] || name).to_sym
      @klass = (options[:class_name] || name.to_s.classify).to_s
      @name  = (options[:singular] || name.to_s.singularize).to_sym
      @path_names = options[:path_names] || {}
      setup_path_names
    end

    # Return modules for the mapping.
    def for
      @for ||= to.devise_modules
    end

    # Reload mapped class each time when cache_classes is false.
    def to
      return @to if @to
      klass = @klass.constantize
      @to = klass if Rails.configuration.cache_classes
      klass
    end

    # Check if the respective controller has a module in the mapping class.
    def allows?(controller)
      self.for.include?(CONTROLLERS[controller.to_sym])
    end

    # Create magic predicates for verifying what module is activated by this map.
    # Example:
    #
    #   def confirmable?
    #     self.for.include?(:confirmable)
    #   end
    #
    ALL.each do |m|
      class_eval <<-METHOD, __FILE__, __LINE__
        def #{m}?
          self.for.include?(:#{m})
        end
      METHOD
    end

    private

      # Configure default path names, allowing the user overwrite defaults by
      # passing a hash in :path_names.
      def setup_path_names
        [:sign_in, :sign_out, :password, :confirmation].each do |path_name|
          @path_names[path_name] ||= path_name.to_s
        end
      end
  end

  mattr_accessor :mappings
  self.mappings = {}

  # Loop through all mappings looking for a map that matches with the requested
  # path (ie /users/sign_in). The important part here is the key :users. If no
  # map is found just returns nil.
  def self.find_mapping_by_path(path)
    route = path.split("/")[1]
    return nil unless route

    route = route.to_sym
    mappings.each do |key, map|
      return map if map.as == route.to_sym
    end
    nil
  end
end