require 'yaml'
require 'fileutils'

def process_locale_file(output, file)
  ## print separator to see where another file begins
  output.write("\n\n" + '#' * 40 + "\n" + '### ' + file + "\n")
  output.write(
    # remove the toplevel "en" key
    YAML.dump(YAML.load_file(file)['en']).lines.map {
      |line| "  #{line}" # << prefix all lines with two spaces (we're nested below "en:")
    }[
      1..-1 # << skip the first line (it's "---" and freaks out the parser if it sees it multiple times in a file)
    ].join
  )
end

namespace :i18n do
  #
  # for coding, it helps to have the english strings in separate files.
  # for translating, it helps to have a single file. This action will combine
  # the small files into one big one.
  #
  # Also, transifex insists that the files be en_US and not just en.
  # grrr. transifex is configured to automatically update from the
  # file lib/en_US.yml.
  #
  desc "combine config/locales/*.en.yml to lib/en_US.yml"
  task :bundle do
    Dir.chdir(Rails.root) do
      en_yml = 'lib/en_US.yml'
      File.open(en_yml, 'w') do |output|
        output.write("en_US:\n\n"+
          "### Do NOT edit this file directly, as all changes will be overwritten by `rake i18n:bundle`\n"+
          "### Instead, make changes in the appropriate file in config/locales.\n"+
          "### Source strings in transifex are automatically updated from this file (via github url)")

        Dir.chdir('config/locales/en') do
          Dir.glob('*.en.yml').sort.each do |file|
            process_locale_file(output, file)
          end
        end
        Dir.chdir('engines') do
          Dir.glob('*/config/locales/en.yml').sort.each do |file|
            process_locale_file(output, file)
          end
        end
        puts "You can now find the bundled locale yml in: #{en_yml}"
      end
    end
  end

  #
  # I have not been able to get fallback from :pt => :'pt-BR' working.
  # The rails guide implies that it does not work, even though I18n has
  # a fallback mechanism.
  # For now, just use a single language for ever locale.
  #
  LOCALE_ALIAS_MAP = {
    :nb => 'nb-no',
    :pt => 'pt-br'
  }

  desc "pull translations from transifex"
  task :download do
    Dir.chdir('config/') do
      if !File.exist?('transifex.netrc')
        puts "In order to download translations, you need a config/transifex.netrc file."
        puts "For example:"
        puts "machine www.transifex.com login yourusername password yourpassword"
        exit
      end
      APP_CONFIG[:available_locales].each do |lang|
        next if lang == :en
        puts
        puts "downloading #{lang}"
        lang_url_segment = LOCALE_ALIAS_MAP[lang] || lang
        url = "https://www.transifex.com/api/2/project/bitmask/resource/leap_web/translation/#{lang_url_segment}/?file"
        command = %[echo "#{lang}:" > locales/#{lang}.yml && ]+
          %[curl -L --netrc-file transifex.netrc -X GET '#{url}' ]+
          %[| tail -n +2 >> locales/#{lang}.yml]
        puts command
        `#{command}`
      end
    end
  end

end