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

from app.crud import todo as todo_crud
from app.db.session import get_db
from app.schemas.todo import TodoCreate, TodoResponse, TodoUpdate

router = APIRouter()

@router.get("/", response_model=List[TodoResponse])
def get_todos(
    skip: int = 0,
    limit: int = 100,
    completed: Optional[bool] = None,
    db: Session = Depends(get_db)
):
    return todo_crud.get_todos(db, skip=skip, limit=limit, completed=completed)

@router.post("/", response_model=TodoResponse, status_code=status.HTTP_201_CREATED)
def create_todo(todo: TodoCreate, db: Session = Depends(get_db)):
    return todo_crud.create_todo(db, todo)

@router.get("/{todo_id}", response_model=TodoResponse)
def get_todo(todo_id: int, db: Session = Depends(get_db)):
    db_todo = todo_crud.get_todo(db, todo_id)
    if db_todo is None:
        raise HTTPException(status_code=404, detail="Todo not found")
    return db_todo

@router.put("/{todo_id}", response_model=TodoResponse)
def update_todo(todo_id: int, todo: TodoUpdate, db: Session = Depends(get_db)):
    db_todo = todo_crud.update_todo(db, todo_id, todo)
    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)):
    success = todo_crud.delete_todo(db, todo_id)
    if not success:
        raise HTTPException(status_code=404, detail="Todo not found")
    return None