class DiscourseTheme::Uploader

  THEME_CREATOR_REGEX = /^https:\/\/theme-creator.discourse.org$/i

  def initialize(dir:, client:, theme_id: nil)
    @dir = dir
    @client = client
    @theme_id = theme_id
  end

  def compress_dir(gzip, dir)
    sgz = Zlib::GzipWriter.new(File.open(gzip, 'wb'))
    tar = Archive::Tar::Minitar::Output.new(sgz)

    Dir.chdir(dir + "/../") do
      Find.find(File.basename(dir)) do |x|
        Find.prune if File.basename(x) == "src"
        Find.prune if File.basename(x)[0] == ?.
        next if File.directory?(x)

        Minitar.pack_file(x, tar)
      end
    end
  ensure
    tar.close
    sgz.close
  end

  def diagnose_errors(json)
    count = 0
    json["theme"]["theme_fields"].each do |row|
      if (error = row["error"]) && error.length > 0
        if count == 0
          puts
        end
        count += 1
        Cli.error
        Cli.error "Error in #{row["target"]} #{row["name"]}: #{row["error"]}"
        Cli.error
      end
    end
    count
  end

  def upload_theme_field(target: , name: , type_id: , value:)
    raise "expecting theme_id to be set!" unless @theme_id

    args = {
      theme: {
        theme_fields: [{
          name: name,
          target: target,
          type_id: type_id,
          value: value
        }]
      }
    }

    response = @client.update_theme(@theme_id, args)
    json = JSON.parse(response.body)
      if diagnose_errors(json) != 0
        Cli.error "(end of errors)"
      end
  end

  def upload_full_theme
    filename = "#{Pathname.new(Dir.tmpdir).realpath}/bundle_#{SecureRandom.hex}.tar.gz"
    compress_dir(filename, @dir)

    File.open(filename) do |tgz|
      response = @client.upload_full_theme(tgz, theme_id: @theme_id)

      json = JSON.parse(response.body)
      @theme_id = json["theme"]["id"]
      if diagnose_errors(json) != 0
        Cli.error "(end of errors)"
      end
      @theme_id
    end
  ensure
    FileUtils.rm_f filename
  end

end