require 'benchmark'
require 'pry'
require 'pdf-reader'
require_relative '../lib/format_parser.rb'

n = 100
Benchmark.bm(7) { |x|
  x.report("a batch of PDF files - with custom parser as is") {
    Dir["*.pdf"].each do |file|
      n.times {
        begin
          parser = FormatParser::PDFParser.new.call(File.open(file, 'rb'))

          if parser
            parser.page_count
          end
        rescue StandardError
        end
      }
    end
  }

  x.report("a batch of PDF files - with `pdfinfo` binary") {
    Dir["*.pdf"].each do |file|
      n.times {
        info = `pdfinfo #{file} > /dev/null`

        # Get page count
        if match = info.match(/Pages:\s*(\d+)/)
          match.captures[0]
        end
      }
    end
  }

  # This is so slow it hurts
  # x.report("a batch of PDF files - with `imagemagick` binary") {
  #   Dir["*.pdf"].each do |file|
  #     n.times {
  #       page_count = `identify -format %n #{file}`.strip
  #     }
  #   end
  # }

  x.report("a batch of PDF files - with pdf-reader gem") {
    Dir["*.pdf"].each do |file|
      n.times {
        begin
          info = PDF::Reader.new(File.open(file))

        # Get page count
          if page_count = info.page_count
            page_count
          end
        rescue PDF::Reader::MalformedPDFError
          # -> nil
        end
      }
    end
  }
}