class KindleFortune

# File lib/kindle_fortune.rb, line 11
def initialize(updated_datafile:, current_datafile:)
  @current_datafile = current_datafile || DEFAULT_CURRENT_DATAFILE
  @updated_datafile = updated_datafile || DEFAULT_UPDATED_DATAFILE
end

# File lib/kindle_fortune.rb, line 16
def fetch_cookie
  if File.exist?(@updated_datafile) then prepare_extracts
  else import_extracts
  end

  raise 'No Kindle highlights detected' unless File.exist?(@current_datafile)
  fortune_cookie = @extracts[rand(@extracts.count)]
  pretty_print(fortune_cookie)
end

# File lib/kindle_fortune.rb, line 28
def import_extracts
  @extracts = JSON.parse(File.read(@current_datafile))
end

# File lib/kindle_fortune.rb, line 32
def prepare_extracts
  @extracts =
    KindleClippings::Parser
    .new
    .parse_file(@updated_datafile)
    .select { |clipping| clipping.type== :Highlight }
    .map do |clipping|
      {
        'book'     => clipping.book_title,
        'author'   => clipping.author,
        'location' => clipping.location,
        'content'  => clipping.content
      }
    end
  store_extracts
end

# File lib/kindle_fortune.rb, line 49
def pretty_print(cookie)
  "#{cookie['book']} (#{cookie['author']}) [L#{cookie['location']}] "\
  "\n\n #{cookie['content']}"
end

# File lib/kindle_fortune.rb, line 54
def store_extracts
  File.delete(@current_datafile) if File.exist?(@current_datafile)
  File.open(@current_datafile, 'a') { |file| file.write(JSON.pretty_generate(@extracts)) }
end