# encoding: utf-8
module FeduxOrgStdlib
  module Roles
    # Typable
    #
    # If need to determine the file type of a object, you can include
    # `FeduxOrgStdlib::Roles::Typeable`. You only need to define a method
    # `source_path`, which is used by the included methods. It needs to return
    # a `Pathname`.
    #
    # @example
    #   
    #   class MyClass
    #     include FeduxOrgStdlib::Roles::Typeable
    #
    #     private
    #
    #     attr_reader :source_path
    #
    #     public
    #
    #     def initialize(source_path:)
    #       @source_path = Pathname.new(source_path)
    #     end
    #   end
    #
    #   object = MyClass.new('images/image.png')
    #   object.type # => :image
    #
    #   object = MyClass.new('images/image.css')
    #   object.type        # => :stylesheet
    #   object.image?      # => false
    #   object.stylesheet? # => true
    module Typable

      def source_path
        fail NoMethodError, :source_path
      end

      # Check on file type
      #
      # @return [true, false]
      #   Is true if has type
      def type?(t)
        type == t
      end

      # Determine type of object
      def type
        @type ||= if image?
                    :image
                  elsif script?
                    :script
                  elsif stylesheet?
                    :stylesheet
                  elsif font?
                    :font
                  else
                    :unknown
                  end
      end

      # Is file?
      def file?
        source_path.file?
      end

      # Is it a valid
      # @return [true, false]
      #   If it is valid return true
      def valid?
        file?
      end

      # Has file extensions
      #
      # @param [Array] exts
      #   The extensions to check
      def extnames?(*exts)
        !(extnames & exts.flatten).empty?
      end

      # Return extensions
      def extnames
        source_path.basename.to_s.scan(/(\.[^.]+)/).flatten
      end

      # Is image?
      def image?
        image_by_path? || (image_by_extension? && !font_by_path?)
      end

      private

      # Is image by path?
      def image_by_path?
        source_path.dirname.basename.to_s == 'images' ||
        source_path.dirname.basename.to_s == 'img'
      end

      # Is image by extension?
      def image_by_extension?
        extnames?(*%w(.gif .png .jpg .jpeg .webp .svg .svgz))
      end

      public

      # Is stylesheet?
      def stylesheet?
        stylesheet_by_path? || stylesheet_by_extension?
      end

      private

      # Is stylesheet by extension?
      def stylesheet_by_extension?
        extnames?(*%w(.css .sass .scss .styl .less))
      end

      # Is stylesheet by path?
      def stylesheet_by_path?
        source_path.dirname.basename.to_s == 'stylesheets' ||
        source_path.dirname.basename.to_s == 'css'
      end

      public

      # Is font?
      def font?
        font_by_path? || font_by_extension?
      end
      
      private

      # Is font by path?
      def font_by_path?
        source_path.dirname.basename.to_s == 'fonts'
      end

      # Is font by extension?
      def font_by_extension?
        extnames?(*%w(.ttf .woff .eot .otf .svg .svgz))
      end

      public

      # Is script?
      def script?
        script_by_path? || script_by_extension?
      end

      private

      # Is script by path?
      def script_by_path?
        source_path.dirname.basename.to_s == 'javascripts' ||
        source_path.dirname.basename.to_s == 'js'
      end

      # Is script by extension?
      def script_by_extension?
        extnames?(*%w(.js .coffee))
      end
    end
  end
end