module Vp
  module Pears
    class VpTheme < ::Pears::Provider::LocalFile
      class InvalidVpTheme < StandardError; end;
      THEMES = Dir[
        "#{__FILE__}".split('/')
            .slice(0..-4)
            .join('/')
            .+('/themes/*')
      ]

      MAP = Hash[
        THEMES.map do |fil|
          fil.split('/')
              .last
              .delete_suffix('.yml')
        end.zip(THEMES)
      ].with_indifferent_access.freeze

      def initialize(name, on_failure: :raise)
        file = MAP[name.downcase]
        raise InvalidVpTheme.new(name) unless file.present?

        super(file, on_failure: on_failure)
      end
    end

    ::Pears::Provider::Builder.enable_provider VpTheme
  end
end