import os
import logging
from telegram import Update
from telegram.ext import Application, CommandHandler, MessageHandler, filters, ContextTypes

# Enable logging
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    level=logging.INFO
)
logger = logging.getLogger(__name__)

# Bot token from environment variable
TOKEN = os.getenv('TELEGRAM_BOT_TOKEN')

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Send a message when the command /start is issued."""
    await update.message.reply_text(
        'Hi! I am Fymious Bot. Send me any message and I will echo it back!'
    )

async def help_command(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Send a message when the command /help is issued."""
    await update.message.reply_text(
        'Available commands:\n'
        '/start - Start the bot\n'
        '/help - Show this help message\n'
        '\nJust send me any text and I will echo it back!'
    )

async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Echo the user message."""
    await update.message.reply_text(f"You said: {update.message.text}")

def main():
    """Start the bot."""
    if not TOKEN:
        logger.error("TELEGRAM_BOT_TOKEN environment variable not set!")
        return
    
    # Create the Application
    application = Application.builder().token(TOKEN).build()

    # Register handlers
    application.add_handler(CommandHandler("start", start))
    application.add_handler(CommandHandler("help", help_command))
    application.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, echo))

    # Start the Bot
    logger.info("Bot is starting...")
    application.run_polling(allowed_updates=Update.ALL_TYPES)

if __name__ == '__main__':
    main()