module EbooksRenamer

# File lib/ebooks_renamer/ebooks_renamer.rb, line 4
def rename(options = {})
  files = CodeLister.files(options)
  files.each_with_index do |file, index|
    # process as many files as possible
    begin
      old_name = File.expand_path(file)
      new_name = formatted_name(old_name, options[:sep_string])
      if old_name != new_name
        puts "#{index + 1} of #{files.length}: Old name: '#{old_name}'"
        puts "#{index + 1} of #{files.length}: New name: '#{new_name}'"
        FileUtils.mv(old_name, new_name) if options[:commit]
      else
        puts "#{index + 1} of #{files.length}: Result  : '#{old_name}' is identical so no action taken."
      end
    rescue => e
      puts "Skip file '#{file}'"
      puts "Due to the unexpected error: #{e.message}"
      next
    end
  end
  unless options[:commit]
    puts "------------------------------------------------------------------"
    puts "This is a dry run only, to actually rename please specify --commit"
    puts "------------------------------------------------------------------"
  end
end

# File lib/ebooks_renamer/ebooks_renamer.rb, line 33
def formatted_name(file, sep_string)
  meta = parse(file)
  if meta && !meta.title.blank?
    name = meta.title
    name += " by #{meta.author}"    unless meta.author.blank?
    name += " #{meta.publisher}"    unless meta.publisher.blank?
    name += " #{meta.pages} pages"  unless meta.pages.blank?

    # return the sanitized file name with full path
    [File.dirname(file),
     File::SEPARATOR,
     FilenameCleaner.sanitize(name, sep_string, false),
     File.extname(file),
    ].join("")
  else
    # return the full path of the original file
    File.expand_path(file)
  end
end

# File lib/ebooks_renamer/ebooks_renamer.rb, line 64
def parse(filename)
  case File.extname(filename)
  when ".epub"
    Parser.new(EpubParser.parse(filename)).parser
  when ".pdf"
    Parser.new(PdfParser.parse(filename)).parser
  when ".mobi"
    Parser.new(MobiParser.parse(filename)).parser
  else
    fail "File type #{File.extname(file)} is not supported"
  end
end