from datetime import datetime, timedelta
from typing import Optional
from jose import JWTError, jwt
from passlib.context import CryptContext
from sqlalchemy.orm import Session
from ..models.user import User
from ..config import settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def hash_password(password: str) -> str:
    return pwd_context.hash(password)


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    to_encode = data.copy()
    expire = datetime.utcnow() + (expires_delta or timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES))
    to_encode["exp"] = expire
    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)


def decode_token(token: str) -> Optional[dict]:
    try:
        return jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
    except JWTError:
        return None


def get_user_by_email(db: Session, email: str) -> Optional[User]:
    return db.query(User).filter(User.email == email).first()


def get_user_by_id(db: Session, user_id: int) -> Optional[User]:
    return db.query(User).filter(User.id == user_id).first()


def create_user(db: Session, full_name: str, email: Optional[str], phone: Optional[str], password: str) -> User:
    user = User(
        full_name=full_name,
        email=email,
        phone=phone,
        hashed_password=hash_password(password),
    )
    db.add(user)
    db.commit()
    db.refresh(user)
    return user


def get_or_create_oauth_user(db: Session, provider: str, oauth_id: str, email: Optional[str], full_name: Optional[str]) -> User:
    user = db.query(User).filter(User.oauth_provider == provider, User.oauth_id == oauth_id).first()
    if user:
        return user
    if email:
        user = db.query(User).filter(User.email == email).first()
        if user:
            user.oauth_provider = provider
            user.oauth_id = oauth_id
            db.commit()
            db.refresh(user)
            return user
    user = User(
        full_name=full_name or "Usuario",
        email=email,
        oauth_provider=provider,
        oauth_id=oauth_id,
    )
    db.add(user)
    db.commit()
    db.refresh(user)
    return user