"""
Professional WhatsApp Bot using Green-API
Author: Assistant
Description: A comprehensive WhatsApp bot with a professional, class-based structure.
             Features include image generation, image editing, voice replies,
             and various utility functions, all handled by an asynchronous task queue.
             Includes request logging and chat ID filtering.
"""

import os
import threading
import requests
import logging
import queue
import json
import base64
from typing import List, Optional, Union, Literal, Dict, Any, Tuple, Set
from collections import defaultdict, deque
from concurrent.futures import ThreadPoolExecutor

from fastapi import FastAPI, Request, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field, ValidationError
import uvicorn

# Assume these are your custom libraries for AI functionalities
from FLUX import generate_image
from VoiceReply import generate_voice_reply
from polLLM import generate_llm, LLMBadRequestError
import flux_kontext_lib

# --- Configuration ---------------------------------------------------------

class BotConfig:
    """Manages all bot configuration from environment variables."""
    GREEN_API_URL: str
    GREEN_API_TOKEN: str
    GREEN_API_ID_INSTANCE: str
    WEBHOOK_AUTH_TOKEN: str
    
    IMAGE_DIR: str = "/tmp/whatsapp_images"
    AUDIO_DIR: str = "/tmp/whatsapp_audio"
    TEMP_DIR: str = "/tmp/whatsapp_edit"
    DEFAULT_IMAGE_COUNT: int = 4
    MAX_HISTORY_SIZE: int = 20
    WORKER_THREADS: int = 4
    # Set log level to DEBUG to capture all incoming requests
    LOG_LEVEL: str = "DEBUG" 
    
    # Whitelisted chat IDs. The bot will only respond to these chats.
    ALLOWED_CHATS: Set[str] = {"94764296220@c.us", "120363312903494448@g.us"}

    def __init__(self):
        """Initializes configuration from environment variables."""
        self.GREEN_API_URL = os.getenv("GREEN_API_URL")
        self.GREEN_API_TOKEN = os.getenv("GREEN_API_TOKEN")
        self.GREEN_API_ID_INSTANCE = os.getenv("GREEN_API_ID_INSTANCE")
        self.WEBHOOK_AUTH_TOKEN = os.getenv("WEBHOOK_AUTH_TOKEN")
        # Allow overriding log level from environment
        self.LOG_LEVEL = os.getenv("LOG_LEVEL", "DEBUG").upper()
        self._validate()

    def _validate(self):
        """Ensures all required environment variables are set."""
        missing = [
            var for var in ("GREEN_API_URL", "GREEN_API_TOKEN", 
                           "GREEN_API_ID_INSTANCE", "WEBHOOK_AUTH_TOKEN")
            if not getattr(self, var)
        ]
        if missing:
            raise ValueError(f"Missing required environment variables: {', '.join(missing)}")

# --- Logging Setup ---------------------------------------------------------

class LoggerSetup:
    """Sets up and manages structured logging for the application."""
    @staticmethod
    def setup(level: str) -> logging.Logger:
        """
        Configures the root logger for the application.
        Args:
            level: The logging level (e.g., "DEBUG", "INFO").
        Returns:
            A configured logger instance.
        """
        logger = logging.getLogger("whatsapp_bot")
        logger.setLevel(level)
        
        # Avoid adding duplicate handlers
        if logger.hasHandlers():
            logger.handlers.clear()

        handler = logging.StreamHandler()
        # Added a more detailed formatter
        formatter = logging.Formatter(
            "%(asctime)s - %(name)s - [%(levelname)s] - [%(chat_id)s] - %(funcName)s:%(lineno)d - %(message)s"
        )
        handler.setFormatter(formatter)

        class ContextFilter(logging.Filter):
            """Injects contextual information into log records."""
            def filter(self, record):
                record.chat_id = ThreadContext.get_context().get("chat_id", "NO_CONTEXT")
                return True

        handler.addFilter(ContextFilter())
        logger.addHandler(handler)
        return logger

# --- Thread Context Management ---------------------------------------------

class ThreadContext:
    """Manages thread-local context for chat and message IDs."""
    _context = threading.local()

    @classmethod
    def set_context(cls, chat_id: str, message_id: str):
        """Sets the context for the current thread."""
        cls._context.chat_id = chat_id
        cls._context.message_id = message_id

    @classmethod
    def get_context(cls) -> Dict[str, Optional[str]]:
        """Retrieves the context for the current thread."""
        return {
            "chat_id": getattr(cls._context, "chat_id", None),
            "message_id": getattr(cls._context, "message_id", None),
        }

# --- Conversation History -------------------------------------------------

class ConversationManager:
    """Manages conversation history for each chat."""
    def __init__(self, max_size: int):
        self.history = defaultdict(lambda: deque(maxlen=max_size))

    def add_user_message(self, chat_id: str, message: str):
        self.history[chat_id].append(f"User: {message}")

    def add_bot_message(self, chat_id: str, message: str):
        self.history[chat_id].append(f"Assistant: {message}")

    def get_history_text(self, chat_id: str) -> str:
        return "\n".join(self.history[chat_id])

    def clear_history(self, chat_id: str):
        self.history[chat_id].clear()

# --- Green-API Client -----------------------------------------------------

class GreenApiClient:
    """A client for interacting with the Green-API for WhatsApp."""
    def __init__(self, config: BotConfig, logger: logging.Logger):
        self.config = config
        self.logger = logger
        self.session = requests.Session()
        self.base_url = (
            f"{self.config.GREEN_API_URL}/waInstance"
            f"{self.config.GREEN_API_ID_INSTANCE}"
        )

    def _request(self, method: str, endpoint: str, **kwargs) -> Optional[Dict[str, Any]]:
        """Makes a request to the Green-API with retries."""
        url = f"{self.base_url}/{endpoint}/{self.config.GREEN_API_TOKEN}"
        for attempt in range(3):
            try:
                self.logger.debug(f"Sending API request to {url} with payload: {kwargs.get('json', kwargs.get('data'))}")
                response = self.session.request(method, url, timeout=20, **kwargs)
                response.raise_for_status()
                return response.json()
            except requests.RequestException as e:
                self.logger.warning(
                    f"API request to {endpoint} failed (attempt {attempt + 1}): {e}"
                )
        self.logger.error(f"API request to {endpoint} failed after all retries.")
        return None

    def send_message(self, chat_id: str, text: str, quoted_message_id: str = None):
        payload = {"chatId": chat_id, "message": text}
        if quoted_message_id:
            payload["quotedMessageId"] = quoted_message_id
        return self._request("POST", "sendMessage", json=payload)

    def send_file(self, chat_id: str, file_path: str, caption: str = "", quoted_message_id: str = None):
        """Uploads and sends a file (image or audio)."""
        filename = os.path.basename(file_path)
        payload = {"chatId": chat_id, "caption": caption}
        if quoted_message_id:
            payload["quotedMessageId"] = quoted_message_id

        with open(file_path, "rb") as f:
            files = {"file": (filename, f)}
            return self._request("POST", "sendFileByUpload", data=payload, files=files)

    def download_file(self, url: str) -> Optional[bytes]:
        """Downloads a file from a given URL."""
        try:
            response = self.session.get(url, timeout=30)
            response.raise_for_status()
            return response.content
        except requests.RequestException as e:
            self.logger.error(f"Failed to download file from {url}: {e}")
            return None

# --- Pydantic Models for Intent Recognition --------------------------------

class BaseIntent(BaseModel):
    action: str

class SummarizeIntent(BaseIntent): action: Literal["summarize"]; text: str
class TranslateIntent(BaseIntent): action: Literal["translate"]; lang: str; text: str
class JokeIntent(BaseIntent): action: Literal["joke"]
class WeatherIntent(BaseIntent): action: Literal["weather"]; location: str
class InspireIntent(BaseIntent): action: Literal["inspire"]
class MemeIntent(BaseIntent): action: Literal["meme"]; text: str
class EditImageIntent(BaseIntent): action: Literal["edit_image"]; prompt: str

class GenerateImageIntent(BaseModel):
    action: Literal["generate_image"]
    prompt: str
    count: int = Field(default=1, ge=1, le=10)
    width: Optional[int] = Field(default=None, ge=512, le=2048)
    height: Optional[int] = Field(default=None, ge=512, le=2048)

class SendTextIntent(BaseIntent):
    action: Literal["send_text"]
    message: str

# --- Intent Router --------------------------------------------------------

class IntentRouter:
    """Recognizes user intent using an LLM and routes to appropriate actions."""
    INTENT_MODELS = [
        SummarizeIntent, TranslateIntent, JokeIntent, WeatherIntent,
        InspireIntent, MemeIntent, GenerateImageIntent, EditImageIntent, SendTextIntent
    ]

    def __init__(self, conv_manager: ConversationManager, logger: logging.Logger):
        self.conv_manager = conv_manager
        self.logger = logger

    def get_intent(self, user_input: str, chat_id: str) -> BaseIntent:
        history_text = self.conv_manager.get_history_text(chat_id)
        system_prompt = self._build_system_prompt(history_text, user_input)

        try:
            raw_response = generate_llm(system_prompt)
        except LLMBadRequestError:
            self.logger.warning(f"LLM request failed due to bad request for chat {chat_id}. Clearing history.")
            self.conv_manager.clear_history(chat_id)
            return SendTextIntent(action="send_text", message="Oops! Let's start fresh! 🌟")

        return self._parse_response(raw_response)

    def _build_system_prompt(self, history: str, user_input: str) -> str:
        return (
            "You are a function dispatcher. You only invoke functions by returning a single JSON object.\n"
            "Available functions:\n"
            "- summarize(text): Summarize given text\n"
            "- translate(lang, text): Translate text to a language\n"
            "- joke(): Tell a random joke\n"
            "- weather(location): Get weather for a location\n"
            "- inspire(): Get an inspirational quote\n"
            "- meme(text): Generate a meme from text\n"
            "- generate_image(prompt, count, width, height): Generate images\n"
            "- edit_image(prompt): Edit an image (requires replying to an image)\n"
            "- send_text(message): Send a plain text response\n\n"
            "Return only raw JSON. Examples:\n"
            '{"action":"generate_image","prompt":"a red fox","count":2}\n'
            '{"action":"edit_image","prompt":"make the sky purple"}\n'
            '{"action":"send_text","message":"Hello there!"}\n\n'
            f"Conversation history:\n{history}\n\n"
            f"Current message: User: {user_input}"
        )

    def _parse_response(self, raw_response: str) -> BaseIntent:
        try:
            # Clean the response to ensure it's valid JSON
            cleaned_response = raw_response.strip().replace("`json", "").replace("`", "")
            parsed = json.loads(cleaned_response)
            for model in self.INTENT_MODELS:
                try:
                    return model.model_validate(parsed)
                except ValidationError:
                    continue
        except json.JSONDecodeError:
            self.logger.warning(f"Could not decode LLM response to JSON: {raw_response}")
        
        # Fallback for non-JSON or unparsable responses
        return SendTextIntent(action="send_text", message=raw_response)

# --- Main Application Class ------------------------------------------------

class WhatsAppBot:
    def __init__(self, config: BotConfig):
        self.config = config
        self.logger = LoggerSetup.setup(config.LOG_LEVEL)
        self.api_client = GreenApiClient(config, self.logger)
        self.conv_manager = ConversationManager(config.MAX_HISTORY_SIZE)
        self.intent_router = IntentRouter(self.conv_manager, self.logger)
        self.task_queue = queue.Queue()
        # Cache to store recent image message IDs and their download URLs
        self.image_cache = defaultdict(lambda: deque(maxlen=50))
        self.fastapi_app = FastAPI(title="WhatsApp Eve Bot", version="2.0.0")
        self._setup_routes()
        self._start_workers()

    def _setup_routes(self):
        @self.fastapi_app.post("/whatsapp")
        async def webhook(request: Request):
            if request.headers.get("Authorization") != f"Bearer {self.config.WEBHOOK_AUTH_TOKEN}":
                self.logger.warning("Unauthorized webhook access attempt.")
                raise HTTPException(403, "Unauthorized")
            
            try:
                payload = await request.json()
                # Log the entire incoming request payload for debugging
                self.logger.debug(f"Incoming webhook payload: {json.dumps(payload, indent=2)}")

                # Process valid incoming messages in the background
                if payload.get("typeWebhook") == "incomingMessageReceived":
                    executor.submit(self._process_incoming_message, payload)
                else:
                    self.logger.info(f"Received non-message webhook type: {payload.get('typeWebhook')}")
            except json.JSONDecodeError:
                self.logger.error("Failed to decode JSON from webhook request.")
                raise HTTPException(400, "Invalid JSON payload.")

            return JSONResponse(content={"status": "received"})

        @self.fastapi_app.api_route("/health", methods=["GET", "HEAD"])
        def health_check():
            return JSONResponse(content={"status": "healthy"})

    def _start_workers(self):
        for i in range(self.config.WORKER_THREADS):
            threading.Thread(target=self._worker, name=f"Worker-{i}", daemon=True).start()
        self.logger.info(f"Started {self.config.WORKER_THREADS} worker threads.")
    
    def _worker(self):
        """Worker thread to process tasks from the queue."""
        while True:
            task = self.task_queue.get()
            try:
                # Set context for the worker thread
                ThreadContext.set_context(task["chat_id"], task["message_id"])
                handler = getattr(self, f"_task_{task['type']}", None)
                if handler:
                    self.logger.debug(f"Processing task: {task['type']} for chat {task['chat_id']}")
                    handler(task)
                else:
                    self.logger.warning(f"Unknown task type received: {task['type']}")
            except Exception as e:
                self.logger.error(f"Error processing task {task.get('type', 'N/A')}: {e}", exc_info=True)
            finally:
                self.task_queue.task_done()

    def _process_incoming_message(self, payload: Dict[str, Any]):
        """Main logic for handling an incoming message payload."""
        try:
            chat_id = payload["senderData"]["chatId"]
            message_id = payload["idMessage"]
            
            # ** CHAT RESTRICTION LOGIC **
            if chat_id not in self.config.ALLOWED_CHATS:
                self.logger.warning(f"Ignoring message from unauthorized chat ID: {chat_id}")
                return

            ThreadContext.set_context(chat_id, message_id)

            message_data = payload.get("messageData", {})
            type_message = message_data.get("typeMessage")
            
            # --- Improved message processing logic ---
            
            # 1. Handle image caching
            if type_message == "imageMessage":
                download_url = message_data.get("fileMessageData", {}).get("downloadUrl")
                if download_url:
                    self.logger.debug(f"Caching image message {message_id} from {chat_id} with URL: {download_url}")
                    self.image_cache[chat_id].append((message_id, download_url))

            # 2. Extract text from various message types
            text = ""
            if type_message == "textMessage":
                text = message_data.get("textMessageData", {}).get("textMessage", "")
            elif type_message == "extendedTextMessage":
                text = message_data.get("extendedTextMessageData", {}).get("text", "")
            elif type_message == "quotedMessage":
                text = message_data.get("extendedTextMessageData", {}).get("text", "")
            elif type_message == "imageMessage":
                text = message_data.get("fileMessageData", {}).get("caption", "")

            text = text.strip()
            if not text:
                self.logger.debug(f"Received message type '{type_message}' without actionable text from {chat_id}. No action taken.")
                return
            
            # --- End of improved logic ---
            
            self.logger.info(f"Processing message from {chat_id}: '{text}'")
            self.conv_manager.add_user_message(chat_id, text)

            # Handle direct commands
            if text.startswith('/'):
                self._handle_command(chat_id, message_id, text, payload)
            else:
                # Handle natural language and replies
                self._handle_natural_language(chat_id, message_id, text, payload)
        
        except KeyError as e:
            self.logger.error(f"Missing expected key in message payload: {e}. Payload: {payload}")
        except Exception as e:
            self.logger.error(f"Failed to process message payload: {e}", exc_info=True)

    def _handle_command(self, chat_id, message_id, text, payload):
        """Processes direct slash commands."""
        parts = text.lower().split()
        command = parts[0]
        args = text.split(maxsplit=1)[1] if len(parts) > 1 else ""

        if command == "/help":
            help_text = (
                "*🤖 Eve's Command Center:*\n\n"
                "🔹 `/help` - Show this help message\n"
                "🔹 `/gen <prompt>` - Generate an image\n"
                "🔹 `/edit <prompt>` - Reply to an image to edit it\n"
                "🔹 `/joke` - Get a random joke\n"
                "🔹 `/inspire` - Receive an inspirational quote\n"
                "🔹 `/weather <location>` - Check the weather\n\n"
                "You can also just chat with me naturally!"
            )
            self.api_client.send_message(chat_id, help_text, message_id)
        elif command == "/gen":
            self.task_queue.put({"type": "generate_image", "chat_id": chat_id, "message_id": message_id, "prompt": args})
        elif command == "/edit":
            self._dispatch_edit_image(chat_id, message_id, args, payload)
        elif command == "/joke":
            self.task_queue.put({"type": "joke", "chat_id": chat_id, "message_id": message_id})
        elif command == "/inspire":
            self.task_queue.put({"type": "inspire", "chat_id": chat_id, "message_id": message_id})
        elif command == "/weather":
            self.task_queue.put({"type": "weather", "chat_id": chat_id, "message_id": message_id, "location": args})
        else:
            self.api_client.send_message(chat_id, "Unknown command. Type /help for options.", message_id)
            
    def _handle_natural_language(self, chat_id, message_id, text, payload):
        """Processes natural language using the intent router."""
        intent = self.intent_router.get_intent(text, chat_id)
        
        task_data = {
            "chat_id": chat_id, 
            "message_id": message_id, 
            **intent.model_dump()
        }
        
        if intent.action == "edit_image":
            # This action needs the original payload to find the replied-to image
            self._dispatch_edit_image(chat_id, message_id, intent.prompt, payload)
        elif hasattr(self, f"_task_{intent.action}"):
            # Enqueue the task with its type and all necessary data
            self.task_queue.put({"type": intent.action, **task_data})
        else:
            self.logger.warning(f"No handler found for intent action: {intent.action}")
            self.api_client.send_message(chat_id, "Sorry, I'm not sure how to handle that.", message_id)
            
    def _dispatch_edit_image(self, chat_id, message_id, prompt, payload):
        """Checks for a replied-to image and dispatches the edit task."""
        message_data = payload.get("messageData", {})
        
        # Ensure we are dealing with a reply
        if message_data.get("typeMessage") != "quotedMessage":
            self.api_client.send_message(chat_id, "To edit an image, please reply to an image with your instructions.", message_id)
            return

        quoted_info = message_data.get("quotedMessage")
        if not quoted_info or quoted_info.get("typeMessage") != "imageMessage":
            self.api_client.send_message(chat_id, "You must reply to an image to edit it.", message_id)
            return
            
        # Get the ID of the message being replied to
        quoted_message_id = quoted_info.get("stanzaId")
        if not quoted_message_id:
            self.logger.error(f"Could not find stanzaId in quoted message: {quoted_info}")
            self.api_client.send_message(chat_id, "Sorry, I couldn't identify which image to edit.", message_id)
            return

        # Find the downloadUrl from our cache
        download_url = None
        if chat_id in self.image_cache:
            # Search the cache for the matching message ID
            for msg_id, url in self.image_cache[chat_id]:
                if msg_id == quoted_message_id:
                    download_url = url
                    break
        
        if not download_url:
            self.logger.warning(f"Could not find download URL for message ID {quoted_message_id} in cache for chat {chat_id}.")
            self.api_client.send_message(chat_id, "I couldn't find the original image. It might be too old. Please send it again before editing.", message_id)
            return

        self.logger.info(f"Found cached image URL for message {quoted_message_id}. Dispatching edit task.")
        self.task_queue.put({
            "type": "edit_image",
            "chat_id": chat_id,
            "message_id": message_id,
            "prompt": prompt,
            "download_url": download_url
        })
        
    # --- Task Handler Methods ---

    def _task_send_text(self, task: Dict[str, Any]):
        chat_id, message_id, message = task["chat_id"], task["message_id"], task["message"]
        self.api_client.send_message(chat_id, message, message_id)
        self.conv_manager.add_bot_message(chat_id, message)
        # Asynchronously generate a voice reply for the sent text
        self.task_queue.put({"type": "voice_reply", "chat_id": chat_id, "message_id": message_id, "text": message})

    def _task_generate_image(self, task: Dict[str, Any]):
        chat_id, mid, prompt, count = task["chat_id"], task["message_id"], task["prompt"], task.get("count", 1)
        self.api_client.send_message(chat_id, f"🎨 Generating {count} image(s) for: \"{prompt}\"...", mid)
        
        for i in range(count):
            try:
                _, path, _, url = generate_image(prompt, mid, str(i), self.config.IMAGE_DIR, width=task.get("width"), height=task.get("height"))
                caption = f"✨ Image {i+1}/{count}: {prompt}"
                self.api_client.send_file(chat_id, path, caption, mid)
                os.remove(path)
            except Exception as e:
                self.logger.error(f"Image generation {i+1} failed: {e}", exc_info=True)
                self.api_client.send_message(chat_id, f"😢 Failed to generate image {i+1}.", mid)
    
    def _task_edit_image(self, task: Dict[str, Any]):
        chat_id, mid, prompt, url = task["chat_id"], task["message_id"], task["prompt"], task["download_url"]
        self.api_client.send_message(chat_id, f"🎨 Editing image with prompt: \"{prompt}\"...", mid)

        input_path, output_path = None, None
        try:
            image_data = self.api_client.download_file(url)
            if not image_data:
                raise ValueError("Failed to download image.")

            os.makedirs(self.config.TEMP_DIR, exist_ok=True)
            input_path = os.path.join(self.config.TEMP_DIR, f"input_{mid}.jpg")
            output_path = os.path.join(self.config.TEMP_DIR, f"output_{mid}.jpg")
            
            with open(input_path, 'wb') as f:
                f.write(image_data)
            
            flux_kontext_lib.generate_image(prompt, input_path, download_path=output_path)
            
            if os.path.exists(output_path):
                caption = f"✨ Edited: {prompt}"
                self.api_client.send_file(chat_id, output_path, caption, mid)
            else:
                raise ValueError("Edited image file not found.")

        except Exception as e:
            self.logger.error(f"Image editing task failed: {e}", exc_info=True)
            self.api_client.send_message(chat_id, "😢 Sorry, I failed to edit the image.", mid)
        finally:
            for path in [input_path, output_path]:
                if path and os.path.exists(path):
                    os.remove(path)
    
    def _task_voice_reply(self, task: Dict[str, Any]):
        text = task["text"]
        prompt = f"Say this in a friendly, playful, and slightly clumsy-cute way: {text}"
        try:
            result = generate_voice_reply(prompt, model="openai-audio", voice="coral", audio_dir=self.config.AUDIO_DIR)
            if result and result[0]:
                path, _ = result
                self.api_client.send_file(task["chat_id"], path, quoted_message_id=task["message_id"])
                os.remove(path)
        except Exception as e:
            self.logger.warning(f"Voice reply generation failed: {e}", exc_info=True)

    def _task_joke(self, task: Dict[str, Any]):
        try:
            j = requests.get("https://official-joke-api.appspot.com/random_joke", timeout=5).json()
            joke = f"{j['setup']}\n\n{j['punchline']}"
        except Exception:
            self.logger.warning("Joke API failed, falling back to LLM.")
            joke = generate_llm("Tell me a short, clean joke.")
        self._task_send_text({"type": "send_text", **task, "message": f"😄 {joke}"})

    def _task_inspire(self, task: Dict[str, Any]):
        quote = generate_llm("Give me a unique, short, uplifting inspirational quote with attribution.")
        self._task_send_text({"type": "send_text", **task, "message": f"✨ {quote}"})
        
    def _task_weather(self, task: Dict[str, Any]):
        location = task.get("location")
        if not location:
             self.api_client.send_message(task["chat_id"], "Please provide a location for the weather.", task["message_id"])
             return
        try:
            raw = requests.get(f"http://wttr.in/{location.replace(' ', '+')}?format=4", timeout=10).text
            report = generate_llm(f"Create a friendly weather report in Celsius from this data:\n\n{raw}")
            self._task_send_text({"type": "send_text", **task, "message": f"🌤️ Weather for {location}:\n{report}"})
        except Exception as e:
            self.logger.error(f"Weather task failed: {e}", exc_info=True)
            self.api_client.send_message(task["chat_id"], "Sorry, I couldn't get the weather.", task["message_id"])

    def run(self):
        """Starts the bot and FastAPI server."""
        self.logger.info("Starting Eve WhatsApp Bot...")
        for d in [self.config.IMAGE_DIR, self.config.AUDIO_DIR, self.config.TEMP_DIR]:
            os.makedirs(d, exist_ok=True)
            self.logger.debug(f"Ensured directory exists: {d}")
        
        # Send a startup message to one of the allowed chats to confirm it's online
        self.api_client.send_message(
           "120363312903494448@g.us",
           "🌟 Eve is online and ready to help! Type /help to see commands."
        )

        uvicorn.run(self.fastapi_app, host="0.0.0.0", port=7860, log_config=None)


if __name__ == "__main__":
    try:
        bot_config = BotConfig()
        executor = ThreadPoolExecutor(max_workers=bot_config.WORKER_THREADS * 2)
        bot = WhatsAppBot(bot_config)
        bot.run()
    except ValueError as e:
        # Catch config validation errors
        logging.basicConfig()
        logging.getLogger().critical(f"❌ CONFIGURATION ERROR: {e}")
    except KeyboardInterrupt:
        print("\n🛑 Bot stopped by user.")
    except Exception as e:
        logging.basicConfig()
        logging.getLogger().critical(f"❌ A fatal error occurred: {e}", exc_info=True)