require "mustache"

module Alephant
  module Preview
    module Template
      class Base < Mustache
        attr_accessor :regions

        def initialize(regions, template_location)
          @regions = regions
          self.template_file = template_location
        end

        def static_host
          ENV["STATIC_HOST"] || "localhost:8000"
        end

        def method_missing(name, *args, &block)
          return super unless respond_to? name.to_s
          region @regions[name.to_s]
        end

        def respond_to?(method)
          valid_regions.include? method.to_s
        end

        def region(components)
          if components.is_a?(Array)
            components.join
          else
            components
          end
        end

        def valid_regions
          template.tokens.find_all do |token|
            token.is_a?(Array) && token[0] == :mustache
          end.map do |token|
            token[2][2][0].to_s
          end
        end
      end
    end
  end
end