using System;
using NAudio.Wave;

class Program
{
    static void Main(string[] args)
    {
        // Set up your Text-to-Speech API (e.g., Google Cloud Text-to-Speech, Azure Cognitive Services, etc.)
        // This example assumes you have a method called SynthesizeTextToSpeech that returns a stream of PCM audio data.
        // Replace SynthesizeTextToSpeech with the appropriate method from your TTS API.

        // Example usage:
        string text = "Hello, world!";
        Stream ttsAudioStream = SynthesizeTextToSpeech(text);

        // Set up NAudio to play the audio stream
        using (var waveOut = new WaveOutEvent())
        using (var waveStream = new RawSourceWaveStream(ttsAudioStream, new WaveFormat(16000, 1)))
        {
            waveOut.Init(waveStream);
            waveOut.Play();

            // Wait for the audio to finish playing
            while (waveOut.PlaybackState == PlaybackState.Playing)
            {
                System.Threading.Thread.Sleep(100);
            }
        }
    }

    // Example method for synthesizing text to speech (replace with your TTS API implementation)
    static Stream SynthesizeTextToSpeech(string text)
    {
        // Example implementation: Just return a MemoryStream with some dummy PCM data
        byte[] dummyAudioData = GenerateDummyAudioData();
        return new System.IO.MemoryStream(dummyAudioData);
    }

    // Example method for generating dummy PCM audio data (replace with your TTS API implementation)
    static byte[] GenerateDummyAudioData()
    {
        // This is a placeholder method. In a real application, you would call your TTS API to generate the audio data.
        // For the sake of this example, we'll just return some simple PCM audio data.
        int sampleRate = 16000; // Sample rate (samples per second)
        int durationSeconds = 5; // Duration of the audio (in seconds)
        int numSamples = sampleRate * durationSeconds; // Total number of samples
        int numChannels = 1; // Mono audio

        // Create a buffer for the PCM data
        byte[] pcmData = new byte[numSamples * numChannels * 2]; // 16-bit PCM (2 bytes per sample)

        // Fill the buffer with dummy audio data (e.g., a sine wave)
        for (int i = 0; i < numSamples; i++)
        {
            // Generate a sine wave with frequency 440 Hz (A4 note)
            double t = (double)i / sampleRate;
            short sampleValue = (short)(Math.Sin(2 * Math.PI * 440 * t) * short.MaxValue);

            // Write the sample value to the PCM buffer (little-endian)
            byte[] sampleBytes = BitConverter.GetBytes(sampleValue);
            pcmData[i * 2] = sampleBytes[0]; // Low byte
            pcmData[i * 2 + 1] = sampleBytes[1]; // High byte
        }

        return pcmData;
    }
}