# modules/tts_handler.py
import subprocess
import platform
import sys
import os
import config
import tempfile
import numpy as np
import wave

def text_to_speech_file(text_to_speak):
    """Generate TTS audio file - with fallback to silent audio if TTS fails"""
    print(f"AI generating audio for: {text_to_speak[:100]}...")
    
    try:
        # Try using system TTS (macOS say command)
        if platform.system() == "Darwin":  # macOS
            with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as wav_file:
                wav_filename = wav_file.name
            
            # Use macOS 'say' command to generate speech
            command = ['say', '-o', wav_filename, '--data-format=LEF32@22050', text_to_speak]
            process = subprocess.run(command, capture_output=True, text=True, timeout=30)
            
            if process.returncode == 0 and os.path.exists(wav_filename):
                print("✅ TTS generated successfully with macOS 'say'")
                return wav_filename
            else:
                print("❌ macOS 'say' command failed, falling back to silent audio")
                return create_silent_audio()
        
        # Try Linux TTS options
        elif platform.system() == "Linux":
            # Check if espeak is available (common on Linux systems)
            if subprocess.run(['which', 'espeak'], capture_output=True).returncode == 0:
                with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as wav_file:
                    wav_filename = wav_file.name
                
                command = ['espeak', '-w', wav_filename, text_to_speak]
                process = subprocess.run(command, capture_output=True, text=True, timeout=30)
                
                if process.returncode == 0 and os.path.exists(wav_filename):
                    print("✅ TTS generated successfully with espeak")
                    return wav_filename
                else:
                    print("❌ espeak command failed, falling back to silent audio")
                    return create_silent_audio()
            else:
                print("❌ No TTS engine available on Linux, using silent audio")
                return create_silent_audio()
        else:
            print("❌ TTS not available on this system, using silent audio")
            return create_silent_audio()
            
    except Exception as e:
        print(f"❌ TTS generation failed: {e}")
        return create_silent_audio()

def create_silent_audio():
    """Create a short silent audio file as fallback"""
    try:
        with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as wav_file:
            wav_filename = wav_file.name
        
        # Create 1 second of silence
        sample_rate = 22050
        duration = 1.0  # seconds
        samples = int(sample_rate * duration)
        audio_data = np.zeros(samples, dtype=np.int16)
        
        # Write WAV file
        with wave.open(wav_filename, 'w') as wav_file:
            wav_file.setnchannels(1)  # Mono
            wav_file.setsampwidth(2)  # 2 bytes per sample
            wav_file.setframerate(sample_rate)
            wav_file.writeframes(audio_data.tobytes())
        
        print("✅ Silent audio fallback created")
        return wav_filename
    except Exception as e:
        print(f"❌ Even silent audio creation failed: {e}")
        return None