from typing import List

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

from app.core.deps import get_current_active_user
from app.crud import todo as todo_crud
from app.db.database import get_db
from app.models.user import User
from app.schemas.todo import Todo, TodoCreate, TodoUpdate

router = APIRouter(
    prefix="/todos",
    tags=["todos"],
    responses={404: {"description": "Todo not found"}},
)


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


@router.get("/", response_model=List[Todo])
def read_todos(
    skip: int = 0, 
    limit: int = 100, 
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Retrieve all todo items for the current user with pagination.
    """
    todos = todo_crud.get_todos_by_owner(db, owner_id=current_user.id, skip=skip, limit=limit)
    return todos


@router.get("/{todo_id}", response_model=Todo)
def read_todo(
    todo_id: int, 
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Retrieve a specific todo item by ID for the current user.
    """
    db_todo = todo_crud.get_todo_by_owner(db, todo_id=todo_id, owner_id=current_user.id)
    if db_todo is None:
        raise HTTPException(status_code=404, detail="Todo not found")
    return db_todo


@router.patch("/{todo_id}", response_model=Todo)
def update_todo(
    todo_id: int, 
    todo: TodoUpdate, 
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Update a todo item for the current user.
    """
    db_todo = todo_crud.update_todo(db, todo_id=todo_id, todo=todo, owner_id=current_user.id)
    if db_todo is None:
        raise HTTPException(status_code=404, detail="Todo not found")
    return db_todo


@router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_todo(
    todo_id: int, 
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Delete a todo item for the current user.
    """
    success = todo_crud.delete_todo(db, todo_id=todo_id, owner_id=current_user.id)
    if not success:
        raise HTTPException(status_code=404, detail="Todo not found")