using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Speech.Recognition;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ManagedSapiTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.textBox1.Text += "CurrentCulture " + CultureInfo.CurrentCulture + Environment.NewLine;
            this.textBox1.Text += "CurrentUICulture " + CultureInfo.CurrentUICulture + Environment.NewLine;
            
            foreach (RecognizerInfo ri in SpeechRecognitionEngine.InstalledRecognizers())
            {
                this.textBox1.Text += String.Format("Id={0}, Name={1}, Description={2}, Culture={3}", ri.Id, ri.Name, ri.Description, ri.Culture) + Environment.NewLine;
                foreach(string key in ri.AdditionalInfo.Keys)
                {
                    this.textBox1.Text += string.Format("{0} = {1}", key, ri.AdditionalInfo[key]) + Environment.NewLine;
                }
            }

            this.rec = new SpeechRecognitionEngine(GetRecognizer()); //this line crashes
            this.rec.SpeechRecognized += rec_SpeechRecognized;
            this.rec.SpeechDetected += rec_SpeechDetected;
            var gb = new GrammarBuilder();
            gb.Culture = CultureInfo.CurrentCulture;
            var c = new Choices("test");
            gb.Append(c);
            this.rec.LoadGrammar(new Grammar(gb));
            this.rec.SetInputToDefaultAudioDevice();
            this.rec.RecognizeAsync(RecognizeMode.Multiple);
        }

        private static RecognizerInfo GetRecognizer()
        {
            foreach (RecognizerInfo recognizer in SpeechRecognitionEngine.InstalledRecognizers())
            {
                if (Thread.CurrentThread.CurrentCulture.Name.Equals(recognizer.Culture.Name, StringComparison.OrdinalIgnoreCase))
                {
                    return recognizer;
                }

            }

            MessageBox.Show("Couldn't locate a suitable recognizer!");
            return null;
        }

        void rec_SpeechDetected(object sender, SpeechDetectedEventArgs e)
        {
            Debug.WriteLine("rec_SpeechDetected");
            
        }

        void rec_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            Debug.WriteLine("rec_SpeechRecognized");
            this.Invoke((MethodInvoker)delegate
            {
                this.Text = e.Result.Text;
            });
        }

        System.Speech.Recognition.SpeechRecognitionEngine rec;
    }
}