class Cerecvoice2019

# File lib/cerecvoice2019.rb, line 25
def initialize(accountid: nil, password: nil, voice: 'Heather', config: {}, 
               cache_filepath: 'cache', 
               url: 'https://cerevoice.com/rest/rest_1_1.php', debug: false)

  @config = ({
    'method' => 'speakExtended',                
    'accountID' => accountid,
    'password' => password,                
    'voice' => voice,
    'audioFormat' => 'ogg',
    'sampleRate' => '48000',
    'metadata' => 'True',
    'audio3D' => 'True'
  }).merge config
  
  @url, @cache_filepath, @debug = url, cache_filepath, debug

  if @config['accountID'].nil? or @config['password'].nil? then
    raise Cerecvoice2019Error, 'invalid accountID or password' 
  end    
  
end

# File lib/cerecvoice2019.rb, line 48
def tts(text='', voice=@config['voice'], out: 'output.' + @config['audioFormat'])

  
  audiofile_out =- out
  
  raise Cerecvoice2019Error, 'text empty' if text.empty?
  
  FileUtils.mkdir_p @cache_filepath
  
  h = Digest::MD5.new << text + voice
  filename = File.join(@cache_filepath, h.to_s + '.'+ @config['audioFormat'])
  
  
  # attempts to find the audio file from a local cache instead of
  # making a relatively expensive request through the web API
  
  if not File.exists? filename then
          
    @config.merge!('text' => CGI.escape(text), 'voice' => voice)
    url = @url + '?' + @config.map {|x| x.join('=')}.join('&')
    puts ('url: ' + url.inspect).debug if @debug
    xml = open(url).read
    puts ('xml: ' + xml.inspect).debug if @debug
    
    doc = Rexle.new xml
    audio_url = doc.root.text('fileUrl')
    puts ('audio_url: ' + audio_url.inspect).debug if @debug
    
    
    puts ('writing file: ' + filename.inspect).debug if @debug
    
    File.open(filename, "wb") do |saved_file|
      # the following "open" is provided by open-uri
      open(audio_url) {|read_file| saved_file.write(read_file.read) }
    end      

  end    
  
  FileUtils.cp filename, audiofile_out    

end