require 'fileutils'
require 'open-uri'

# a bunch of things that should never be called in testing due to side effects
module Railsthemes
  class Utils
    # remove file only if it exists
    def self.remove_file filepath
      if File.exists?(filepath)
        File.delete filepath
      end
    end

    # copy a file, ensuring that the directory is present
    def self.copy_ensuring_directory_exists src, dest
      FileUtils.mkdir_p(File.dirname(dest)) # create directory if necessary
      FileUtils.cp src, dest
    end

    def self.read_file filepath
      File.exists?(filepath) ? File.read(filepath) : ''
    end

    # would be nice to put download status in the output (speed, progress, etc.)
    def self.download_file_to url, save_to
      File.open(save_to, "wb") do |saved_file|
        # the following "open" is provided by open-uri
        open(url) do |read_file|
          saved_file.write(read_file.read)
        end
      end
    end
  end
end