require 'puppet-herald'
require 'uglifier'

# A module for Herald
module PuppetHerald
  # A javascript processing class
  class Javascript
    # Initialize JS class
    def initialize
      @files = nil
      @base = 'lib/puppet-herald/public'
    end

    # Returns a list of JS files to be inserted into main HTML
    # @return [Array] list of JS's
    def files
      @files = nil if PuppetHerald.in_dev?
      if @files.nil?
        public_dir = PuppetHerald.relative_dir(@base)
        all = Dir.chdir(public_dir) { Dir.glob('**/*.js') }
        @files = all.reverse.reject { |file| file.match(/_test\.js$/) }
      end
      @files
    end

    # Uglify an application JS's into one minified JS file
    # @param mapname [String] name of source map to be put into uglified JS
    # @return [Hash] a hash with uglified JS and source map
    def uglify(mapname)
      sources = files.collect { |file| File.read("#{@base}/#{file}") }
      source = sources.join "\n"
      uglifier = Uglifier.new(source_map_url: mapname)
      uglified, source_map = uglifier.compile_with_map(source)
      {
        'js'     => uglified,
        'js.map' => source_map
      }
    end
  end
end