"""Authentication routes."""
from datetime import timedelta
from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from sqlalchemy.orm import Session
from passlib.context import CryptContext

from app.database import get_db
from app.models.user import User
from app.schemas.auth import Token, LoginRequest
from app.schemas.user import UserCreate, UserResponse
from app.config import settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")

router = APIRouter(prefix="/auth", tags=["auth"])

def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verify password."""
    return pwd_context.verify(plain_password, hashed_password)

def get_password_hash(password: str) -> str:
    """Hash password."""
    return pwd_context.hash(password)

def create_access_token(data: dict, expires_delta: timedelta | None = None):
    """Create access token."""
    from jose import jwt
    to_encode = data.copy()
    expire = datetime.utcnow() + (expires_delta or timedelta(minutes=15))
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)

@router.post("/register", response_model=UserResponse)
def register(user: UserCreate, db: Session = Depends(get_db)):
    """Register new user."""
    db_user = db.query(User).filter(User.email == user.email).first()
    if db_user:
        raise HTTPException(status_code=400, detail="Email already registered")
    hashed_password = get_password_hash(user.password)
    db_user = User(
        email=user.email,
        username=user.username,
        hashed_password=hashed_password,
        full_name=user.full_name
    )
    db.add(db_user)
    db.commit()
    db.refresh(db_user)
    return db_user

@router.post("/login", response_model=Token)
def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
    """Login user."""
    user = db.query(User).filter(User.username == form_data.username).first()
    if not user or not verify_password(form_data.password, user.hashed_password):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password"
        )
    access_token = create_access_token(
        data={"sub": str(user.id)},
        expires_delta=timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    )
    return {"access_token": access_token, "token_type": "bearer"}