from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from api.crud.todo import create_todo, delete_todo, get_todo, get_todos, update_todo
from api.schemas.todo import TodoCreate, TodoResponse, TodoUpdate
from api.utils.auth import get_current_active_user
from db.database import get_db
from db.models import User

router = APIRouter()


@router.get("/", response_model=list[TodoResponse])
def read_todos(
    skip: int = 0,
    limit: int = 100,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user),
):
    """
    Get all todos for the current user with pagination
    """
    todos = get_todos(db, user_id=current_user.id, skip=skip, limit=limit)
    return todos


@router.get("/{todo_id}", response_model=TodoResponse)
def read_todo(
    todo_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user),
):
    """
    Get a specific todo by ID for the current user
    """
    db_todo = get_todo(db, todo_id=todo_id, user_id=current_user.id)
    if db_todo is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Todo not found")
    return db_todo


@router.post("/", response_model=TodoResponse, status_code=status.HTTP_201_CREATED)
def create_new_todo(
    todo: TodoCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user),
):
    """
    Create a new todo for the current user
    """
    return create_todo(db=db, todo=todo, user_id=current_user.id)


@router.patch("/{todo_id}", response_model=TodoResponse)
def update_existing_todo(
    todo_id: int,
    todo: TodoUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user),
):
    """
    Update an existing todo (partial update) for the current user
    """
    db_todo = update_todo(db=db, todo_id=todo_id, todo=todo, user_id=current_user.id)
    if db_todo is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Todo not found")
    return db_todo


@router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_existing_todo(
    todo_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user),
):
    """
    Delete a todo for the current user
    """
    success = delete_todo(db=db, todo_id=todo_id, user_id=current_user.id)
    if not success:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Todo not found")
    return None