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

users = []  # In-memory storage

router = APIRouter()

class LoginRequest(BaseModel):
    username: str
    password: str

@router.post("/login")
async def login_demo(request: LoginRequest):
    """Demo login endpoint"""
    user = next((u for u in users if u["username"] == request.username), None)
    if not user or user["password"] != request.password:
        raise HTTPException(status_code=400, detail="Invalid credentials")

    return {
        "message": "Login successful (demo)", 
        "user": request.username,
        "token": "dummy_jwt_token_123",
        "features": {
            "rate_limit": 100,
            "expires_in": 3600
        }
    }