#!/usr/bin/env python3
"""
A simplified implementation of the LLaMA-Omni2 model worker
that doesn't rely on deep LLaMA-Omni2 imports.
"""

import argparse
import asyncio
import json
import logging
import os
import re
import threading
import time
import uuid
from typing import Dict, List, Optional, Tuple

import aiohttp
import fastapi
from fastapi import BackgroundTasks, Request
from fastapi.responses import JSONResponse, Response, StreamingResponse
import gradio as gr
import uvicorn
from transformers import AutoConfig, AutoTokenizer, AutoModelForCausalLM

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Define constants
WORKER_HEART_BEAT_INTERVAL = 30
CONTROLLER_HEART_BEAT_EXPIRATION = 120

class ModelWorker:
    def __init__(
        self,
        controller_addr: str,
        worker_addr: str,
        worker_id: str,
        model_path: str,
        model_name: str,
        device: str = "cpu",
        limit_worker_concurrency: int = 5,
    ):
        self.controller_addr = controller_addr
        self.worker_addr = worker_addr
        self.worker_id = worker_id
        self.model_path = model_path
        self.model_name = model_name
        self.device = device
        self.limit_worker_concurrency = limit_worker_concurrency
        
        # Track current requests
        self.lock = asyncio.Lock()
        self.messages = {}
        self.sem = asyncio.Semaphore(limit_worker_concurrency)
        
        # Placeholders - the real implementation would load the model
        logger.info(f"Loading model from {model_path}...")
        try:
            self.tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
            self.model = None  # In a real implementation, we would load the model here
            logger.info(f"Model initialization successful (tokenizer only, no model)")
        except Exception as e:
            logger.error(f"Failed to load model: {e}")
            logger.info("Using dummy model instead")
            self.tokenizer = None
            self.model = None
        
        logger.info(f"Model loaded successfully ({model_name})")
   
    async def generate_response(self, request_data):
        """Generate a response (simulated)"""
        prompt = request_data.get("prompt", "")
        response = f"This is a simulated response for prompt: {prompt[:30]}..."
        return response
        
    async def register_to_controller(self):
        """Register this worker with the controller"""
        controller_addr = self.controller_addr
        worker_addr = self.worker_addr
        worker_id = self.worker_id
        model_name = self.model_name
        
        data = {
            "worker_name": worker_id,
            "worker_url": worker_addr,
            "model_names": [model_name],
            "check_heart_beat": True,
        }
        
        logger.info(f"Register to controller at {controller_addr}")
        
        async with aiohttp.ClientSession() as session:
            async with session.post(
                f"{controller_addr}/register_worker",
                json=data,
                timeout=30,
            ) as response:
                if response.status != 200:
                    logger.error(f"Failed to register to controller: {await response.text()}")
                    return False
                else:
                    logger.info(f"Registered to controller successfully")
                    return True
    
    async def send_heart_beat(self):
        """Send a heartbeat to the controller periodically"""
        controller_addr = self.controller_addr
        worker_id = self.worker_id
        
        data = {
            "worker_name": worker_id,
        }
        
        async with aiohttp.ClientSession() as session:
            while True:
                try:
                    async with session.post(
                        f"{controller_addr}/heart_beat",
                        json=data,
                        timeout=30,
                    ) as response:
                        if response.status != 200:
                            logger.error(f"Failed to send heart beat: {await response.text()}")
                except Exception as e:
                    logger.error(f"Error sending heart beat: {e}")
                
                await asyncio.sleep(WORKER_HEART_BEAT_INTERVAL)

# FastAPI app
app = fastapi.FastAPI()

@app.post("/generate")
async def generate(request: Request):
    """Generate text based on the prompt"""
    global model_worker
    
    if not model_worker:
        return JSONResponse(
            {"error": "Model worker not initialized"},
            status_code=500,
        )
    
    data = await request.json()
    response = await model_worker.generate_response(data)
    
    return {"response": response}

@app.get("/status")
async def status():
    """Get the status of the worker"""
    global model_worker
    
    if not model_worker:
        return {"status": "offline"}
    
    return {
        "status": "online",
        "model_name": model_worker.model_name,
        "worker_id": model_worker.worker_id,
    }

# Global model worker instance
model_worker = None

def start_background_tasks(app):
    """Start background tasks when the app starts"""
    asyncio.create_task(model_worker.register_to_controller())
    asyncio.create_task(model_worker.send_heart_beat())

# Run the server
def main():
    global model_worker
    
    parser = argparse.ArgumentParser(description="Model worker for LLaMA-Omni2")
    parser.add_argument("--host", type=str, default="0.0.0.0")
    parser.add_argument("--port", type=int, default=40000)
    parser.add_argument("--controller", type=str, default="http://localhost:10000")
    parser.add_argument("--worker", type=str, default="http://localhost:40000")
    parser.add_argument("--model-path", type=str, required=True)
    parser.add_argument("--model-name", type=str, required=True)
    parser.add_argument("--limit-worker-concurrency", type=int, default=5)
    parser.add_argument("--device", type=str, default="cpu")
    args = parser.parse_args()
    
    logger.info(f"Initializing model worker with model {args.model_name}")
    
    # Initialize the model worker
    worker_id = f"worker-{str(uuid.uuid4())[:8]}"
    model_worker = ModelWorker(
        controller_addr=args.controller,
        worker_addr=args.worker,
        worker_id=worker_id,
        model_path=args.model_path,
        model_name=args.model_name,
        device=args.device,
        limit_worker_concurrency=args.limit_worker_concurrency,
    )
    
    # Start the FastAPI app with background tasks
    app.add_event_handler("startup", lambda: start_background_tasks(app))
    
    logger.info(f"Starting model worker server at http://{args.host}:{args.port}")
    uvicorn.run(app, host=args.host, port=args.port)

if __name__ == "__main__":
    main()