from sqlalchemy.orm import Session
from app import models, schemas
from app.utils import hash_password, verify_password
from typing import List, Optional


def get_blog(db: Session, blog_id: int) -> Optional[models.Blog]:
    return db.query(models.Blog).filter(models.Blog.id == blog_id).first()


def get_blogs(
    db: Session,
    skip: int = 0,
    limit: int = 10,
    author_id: Optional[int] = None,
    visibility: Optional[str] = None,
) -> List[models.Blog]:
    q = db.query(models.Blog)
    if author_id is not None:
        q = q.filter(models.Blog.author_id == author_id)
    if visibility is not None:
        q = q.filter(models.Blog.visibility == visibility)
    return q.offset(skip).limit(limit).all()


def create_blog(db: Session, blog_in: schemas.BlogCreate) -> models.Blog:
    db_blog = models.Blog(**blog_in.model_dump())
    db.add(db_blog)
    db.commit()
    db.refresh(db_blog)
    return db_blog


def update_blog(
    db: Session, blog_id: int, blog_in: schemas.BlogUpdate
) -> Optional[models.Blog]:
    db_blog = get_blog(db, blog_id)
    if not db_blog:
        return None
    update_data = blog_in.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(db_blog, field, value)
    db.commit()
    db.refresh(db_blog)
    return db_blog


def delete_blog(db: Session, blog_id: int) -> Optional[models.Blog]:
    db_blog = get_blog(db, blog_id)
    if not db_blog:
        return None
    db.delete(db_blog)
    db.commit()
    return db_blog


def increment_view_count(db: Session, blog_id: int) -> None:
    db.query(models.Blog).filter(models.Blog.id == blog_id).update(
        {"view_count": models.Blog.view_count + 1}
    )
    db.commit()


def add_like(db: Session, blog_id: int) -> None:
    db.query(models.Blog).filter(models.Blog.id == blog_id).update(
        {"like_count": models.Blog.like_count + 1}
    )
    db.commit()


def delete_blogs(db: Session, item_id: int):
    item = db.query(models.Blog).filter(models.Blog.id == item_id).first()
    if item:
        db.delete(item)
        db.commit()
    return item


# User / Auth


def authenticate_user(db: Session, username: str, password: str):
    user = get_user_by_username(db, username) or get_user_by_email(db, username)
    if not user:
        return None
    if not verify_password(password, user.hashed_password):
        return None
    return user


def get_user_by_username(db: Session, username: str):
    return db.query(models.User).filter(models.User.username == username).first()


def get_user_by_email(db: Session, email: str):
    return db.query(models.User).filter(models.User.email == email).first()


def create_user(db: Session, user: schemas.UserCreate):
    hashed_pw = hash_password(user.password)
    db_user = models.User(
        username=user.username,
        email=user.email,
        hashed_password=hashed_pw,
        permissions=user.permissions,
        subscriber=user.subscriber,
    )
    db.add(db_user)
    db.commit()
    db.refresh(db_user)
    return db_user