from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel

router = APIRouter()

class HelloMessage(BaseModel):
    message: str

@router.post("/api/v1/endpoint")
async def hello_world(body: HelloMessage):
    """Demo hello world endpoint"""
    if body.message.lower() != "hello":
        raise HTTPException(status_code=400, detail="Message must be 'hello'")
    
    return {
        "message": "Success",
        "data": "world",
        "metadata": {
            "received_message": body.message,
            "timestamp": "demo_timestamp"
        }
    }