from typing import Any, Dict, List, Optional, Union

from sqlalchemy import and_
from sqlalchemy.orm import Session

from app.models.task import Task
from app.schemas.task import TaskCreate, TaskUpdate


def get(db: Session, task_id: int, user_id: int) -> Optional[Task]:
    """
    Get a task by ID and user_id
    """
    return db.query(Task).filter(
        and_(Task.id == task_id, Task.user_id == user_id, not Task.is_deleted)
    ).first()

def get_multi(
    db: Session, user_id: int, skip: int = 0, limit: int = 100
) -> List[Task]:
    """
    Get multiple tasks by user_id
    """
    return db.query(Task).filter(
        and_(Task.user_id == user_id, not Task.is_deleted)
    ).offset(skip).limit(limit).all()

def create(db: Session, obj_in: TaskCreate, user_id: int) -> Task:
    """
    Create a new task
    """
    db_obj = Task(
        **obj_in.model_dump(),
        user_id=user_id
    )
    db.add(db_obj)
    db.commit()
    db.refresh(db_obj)
    return db_obj

def update(
    db: Session, db_obj: Task, obj_in: Union[TaskUpdate, Dict[str, Any]]
) -> Task:
    """
    Update a task
    """
    if isinstance(obj_in, dict):
        update_data = obj_in
    else:
        update_data = obj_in.model_dump(exclude_unset=True)

    for field in update_data:
        if hasattr(db_obj, field):
            setattr(db_obj, field, update_data[field])

    db.add(db_obj)
    db.commit()
    db.refresh(db_obj)
    return db_obj

def delete(db: Session, task_id: int, user_id: int) -> bool:
    """
    Soft delete a task by setting is_deleted to True
    """
    task = get(db, task_id=task_id, user_id=user_id)
    if not task:
        return False

    task.is_deleted = True
    db.add(task)
    db.commit()
    return True

def hard_delete(db: Session, task_id: int, user_id: int) -> bool:
    """
    Hard delete a task
    """
    task = get(db, task_id=task_id, user_id=user_id)
    if not task:
        return False

    db.delete(task)
    db.commit()
    return True