from typing import Any, List, Optional

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

from app.api.deps import get_current_active_user, get_db
from app.crud.crud_todo import (
    create_todo,
    delete_todo,
    get_todo,
    get_todos,
    update_todo,
)
from app.models.user import User
from app.schemas.todo import Todo, TodoCreate, TodoUpdate

router = APIRouter()


@router.get("/", response_model=List[Todo])
def read_todos(
    db: Session = Depends(get_db),
    skip: int = 0,
    limit: int = 100,
    title: Optional[str] = None,
    is_completed: Optional[bool] = None,
    current_user: User = Depends(get_current_active_user),
) -> Any:
    """
    Retrieve todos with optional filtering.
    
    - **skip**: Number of records to skip for pagination
    - **limit**: Maximum number of records to return
    - **title**: Filter by title (contains search)
    - **is_completed**: Filter by completion status
    """
    todos = get_todos(
        db=db, 
        owner_id=current_user.id, 
        skip=skip, 
        limit=limit,
        title=title,
        is_completed=is_completed
    )
    return todos


@router.post("/", response_model=Todo)
def create_todo_item(
    *,
    db: Session = Depends(get_db),
    todo_in: TodoCreate,
    current_user: User = Depends(get_current_active_user),
) -> Any:
    """
    Create new todo.
    """
    todo = create_todo(db=db, todo_in=todo_in, owner_id=current_user.id)
    return todo


@router.get("/{id}", response_model=Todo)
def read_todo(
    *,
    db: Session = Depends(get_db),
    id: int,
    current_user: User = Depends(get_current_active_user),
) -> Any:
    """
    Get todo by ID.
    """
    todo = get_todo(db=db, todo_id=id)
    if not todo:
        raise HTTPException(status_code=404, detail="Todo not found")
    if todo.owner_id != current_user.id:
        raise HTTPException(status_code=400, detail="Not enough permissions")
    return todo


@router.put("/{id}", response_model=Todo)
def update_todo_item(
    *,
    db: Session = Depends(get_db),
    id: int,
    todo_in: TodoUpdate,
    current_user: User = Depends(get_current_active_user),
) -> Any:
    """
    Update a todo.
    """
    todo = get_todo(db=db, todo_id=id)
    if not todo:
        raise HTTPException(status_code=404, detail="Todo not found")
    if todo.owner_id != current_user.id:
        raise HTTPException(status_code=400, detail="Not enough permissions")
    todo = update_todo(db=db, db_obj=todo, obj_in=todo_in)
    return todo


@router.delete("/{id}", response_model=None, status_code=status.HTTP_204_NO_CONTENT)
def delete_todo_item(
    *,
    db: Session = Depends(get_db),
    id: int,
    current_user: User = Depends(get_current_active_user),
) -> Any:
    """
    Delete a todo.
    """
    todo = get_todo(db=db, todo_id=id)
    if not todo:
        raise HTTPException(status_code=404, detail="Todo not found")
    if todo.owner_id != current_user.id:
        raise HTTPException(status_code=400, detail="Not enough permissions")
    delete_todo(db=db, todo_id=id)
    return None