from typing import List

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

from app import crud, models
from app.api import deps
from app.db.session import get_db
from app.schemas.todo import Todo, TodoCreate, TodoUpdate

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


@router.get("/", response_model=List[Todo])
def get_todos(
    skip: int = Query(0, description="Skip the first N items"),
    limit: int = Query(100, description="Limit the number of items returned"),
    db: Session = Depends(get_db),
    current_user: models.User = Depends(deps.get_current_active_user),
):
    """
    Get all todos for the current user with pagination
    """
    return crud.todo.get_todos(db=db, user_id=current_user.id, skip=skip, limit=limit)


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


@router.get("/{todo_id}", response_model=Todo)
def get_todo(
    todo_id: int,
    db: Session = Depends(get_db),
    current_user: models.User = Depends(deps.get_current_active_user),
):
    """
    Get a specific todo by ID, ensuring it belongs to the current user
    """
    db_todo = crud.todo.get_todo(db=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=f"Todo with ID {todo_id} not found",
        )
    return db_todo


@router.put("/{todo_id}", response_model=Todo)
def update_todo(
    todo_id: int,
    todo: TodoUpdate,
    db: Session = Depends(get_db),
    current_user: models.User = Depends(deps.get_current_active_user),
):
    """
    Update a todo, ensuring it belongs to the current user
    """
    db_todo = crud.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=f"Todo with ID {todo_id} not found",
        )
    return db_todo


@router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
def delete_todo(
    todo_id: int,
    db: Session = Depends(get_db),
    current_user: models.User = Depends(deps.get_current_active_user),
):
    """
    Delete a todo, ensuring it belongs to the current user
    """
    success = crud.todo.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=f"Todo with ID {todo_id} not found",
        )
    return None