"""
Helper functions for realtime session management
"""
import base64
from typing import Optional
from datetime import datetime
import sys

from logger import log_info, log_error, log_debug

def log(message: str):
    """Log helper with timestamp"""
    timestamp = datetime.now().strftime("%H:%M:%S.%f")[:-3]
    print(f"[{timestamp}] {message}")
    sys.stdout.flush()

async def send_tts_welcome_message(websocket, session_id: str, tts_provider, text: str):
    """Send welcome message TTS audio"""
    try:
        # Generate TTS
        audio_data = await tts_provider.synthesize(text)
        
        # Convert to base64
        audio_base64 = base64.b64encode(audio_data).decode('utf-8')
        
        # Send in chunks
        chunk_size = 16384
        total_length = len(audio_base64)
        total_chunks = (total_length + chunk_size - 1) // chunk_size
        
        for i in range(0, total_length, chunk_size):
            chunk = audio_base64[i:i + chunk_size]
            chunk_index = i // chunk_size
            
            await websocket.send_json({
                "type": "tts_audio",
                "data": chunk,
                "chunk_index": chunk_index,
                "total_chunks": total_chunks,
                "is_last": chunk_index == total_chunks - 1,
                "mime_type": "audio/mpeg"
            })
        
        log_info(f"✅ Welcome message TTS sent", session_id=session_id)
        
    except Exception as e:
        log_error(f"Failed to send welcome TTS", error=str(e), session_id=session_id)