from fastapi import APIRouter, HTTPException, Depends
from sqlalchemy.orm import Session
from passlib.context import CryptContext
from app.database import SessionLocal
from app.models import User
import jwt
import os

router = APIRouter()
SECRET_KEY = "your_secret_key"
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

@router.post("/register")
def register(username: str, password: str, db: Session = Depends(get_db)):
    hashed_password = pwd_context.hash(password)
    user = User(username=username, password=hashed_password)
    db.add(user)
    db.commit()
    return {"message": "User registered"}

@router.post("/login")
def login(username: str, password: str, db: Session = Depends(get_db)):
    user = db.query(User).filter(User.username == username).first()
    if not user or not pwd_context.verify(password, user.password):
        raise HTTPException(status_code=401, detail="Invalid credentials")
    
    token = jwt.encode({"user_id": user.id}, SECRET_KEY, algorithm="HS256")
    return {"token": token}