using System;

using Microsoft.Speech.Synthesis; 
// x86 version. if 64-bit, must adjust Build properties

using Microsoft.Speech.Recognition;
using System.Globalization;


// Speech recognition and synthesis demo. C# Console Application.
// To run this you need to install four packages.
//
// I recommend x86 versions even on x64 machines.
// 1.) Microsoft Speech Platform 11 Runtime (to run speech recognition and synthesis on your machine) 
// 2.) Microsoft Speech Platform 11 SDK (to create in Visual Studio)
// 3.) Microsoft Speech Platform 11 Runtime Language MSSpeech_SR_en-US_TELE.msi (to recognize speech)
// 4.) Microsoft Speech Platform 11 Runtime Language MSSpeech_TTS_en-US_Helen.msi (to speak via synthesis)
// Add a reference to Microsoft.Speech.dll which is
// typically at C:\Program Files (x86)\Microsoft SDKs\Speech\v11.0\Assembly
//
// You can use this code however you wish subject to the usual disclaimers
// (use at your own risk, etc.)

 
namespace ConsoleSpeech
{
  class ConsoleSpeechProgram
  {
    static SpeechSynthesizer ss = new SpeechSynthesizer(); 
    static SpeechRecognitionEngine sre;
    static bool done = false;
    static bool speechOn = true;

    static void Main(string[] args)
    {
      try
      {
        ss.SetOutputToDefaultAudioDevice();
        ss.Speak("I am awake");

        CultureInfo ci = new CultureInfo("en-us");
        sre = new SpeechRecognitionEngine(ci);
        sre.SetInputToDefaultAudioDevice();
        sre.SpeechRecognized += sre_SpeechRecognized;

        Choices ch_StartStopCommands = new Choices();
        ch_StartStopCommands.Add("speech on");
        ch_StartStopCommands.Add("speech off");
        ch_StartStopCommands.Add("klatu barada nikto");
        GrammarBuilder gb_StartStop = new GrammarBuilder();
        gb_StartStop.Append(ch_StartStopCommands);
        Grammar g_StartStop = new Grammar(gb_StartStop);

        Choices ch_Numbers = new Choices();
        ch_Numbers.Add("1"); ch_Numbers.Add("2"); ch_Numbers.Add("3"); ch_Numbers.Add("4");
        GrammarBuilder gb_WhatIsXplusY = new GrammarBuilder();
        gb_WhatIsXplusY.Append("What is"); gb_WhatIsXplusY.Append(ch_Numbers); gb_WhatIsXplusY.Append("plus"); gb_WhatIsXplusY.Append(ch_Numbers);
        Grammar g_WhatIsXplusY = new Grammar(gb_WhatIsXplusY);

        sre.LoadGrammarAsync(g_StartStop);
        sre.LoadGrammarAsync(g_WhatIsXplusY);

        sre.RecognizeAsync(RecognizeMode.Multiple);

        while (done == false) { ; }
        Console.WriteLine("\nHit  to close shell\n");
        Console.ReadLine();
      }
      catch (Exception ex)
      {
        Console.WriteLine(ex.Message);
        Console.ReadLine();
      }

    } // Main

    static void sre_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
    {
      
      string txt = e.Result.Text;
      double confidence = e.Result.Confidence;
      Console.WriteLine("\nRecognized: " + txt);

      if (confidence < 0.60) return;

      if (txt.IndexOf("speech on") >= 0)
      {
        Console.WriteLine("Speech is now ON");
        speechOn = true;
      }

      if (txt.IndexOf("speech off") >= 0)
      {
        Console.WriteLine("Speech is now OFF");
        speechOn = false;
      }

      if (speechOn == false) return;

      if (txt.IndexOf("klatu") >= 0 && txt.IndexOf("barada") >= 0)
      {
        ((SpeechRecognitionEngine)sender).RecognizeAsyncCancel();
        done = true;
        ss.Speak("Farewell");
      }

      if (txt.IndexOf("What") >= 0 && txt.IndexOf("plus") >= 0) // what is 2 plus 3
      { 
        string[] words = txt.Split(' ');     // or use e.Result.Words
        int num1 = int.Parse(words[2]);
        int num2 = int.Parse(words[4]);
        int sum = num1 + num2;
        Console.WriteLine("Speaking: " + words[2] + " plus " + words[4] + " equals " + sum);
        ss.SpeakAsync(words[2] + " plus " + words[4] + " equals " + sum);
      }
    } // sre_SpeechRecognized

  } // Program

} // ns