from typing import Any

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

from app import crud, schemas
from app.api import deps

router = APIRouter()


@router.get("/", response_model=list[schemas.Genre])
def read_genres(
    db: Session = Depends(deps.get_db),
    skip: int = 0,
    limit: int = 100,
) -> Any:
    """
    Retrieve genres.
    """
    genres = crud.genre.get_multi(db, skip=skip, limit=limit)
    return genres


@router.post("/", response_model=schemas.Genre)
def create_genre(
    *,
    db: Session = Depends(deps.get_db),
    genre_in: schemas.GenreCreate,
) -> Any:
    """
    Create new genre.
    """
    genre = crud.genre.get_by_name(db, name=genre_in.name)
    if genre:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A genre with this name already exists.",
        )
    genre = crud.genre.create(db, obj_in=genre_in)
    return genre


@router.get("/{genre_id}", response_model=schemas.Genre)
def read_genre(
    *,
    db: Session = Depends(deps.get_db),
    genre_id: int,
) -> Any:
    """
    Get genre by ID.
    """
    genre = crud.genre.get(db, id=genre_id)
    if not genre:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Genre not found",
        )
    return genre


@router.put("/{genre_id}", response_model=schemas.Genre)
def update_genre(
    *,
    db: Session = Depends(deps.get_db),
    genre_id: int,
    genre_in: schemas.GenreUpdate,
) -> Any:
    """
    Update a genre.
    """
    genre = crud.genre.get(db, id=genre_id)
    if not genre:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Genre not found",
        )

    # Check if updating to an existing name
    if genre_in.name and genre_in.name != genre.name:
        existing_genre = crud.genre.get_by_name(db, name=genre_in.name)
        if existing_genre:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="A genre with this name already exists.",
            )

    genre = crud.genre.update(db, db_obj=genre, obj_in=genre_in)
    return genre


@router.delete("/{genre_id}", response_model=schemas.Genre)
def delete_genre(
    *,
    db: Session = Depends(deps.get_db),
    genre_id: int,
) -> Any:
    """
    Delete a genre.
    """
    genre = crud.genre.get(db, id=genre_id)
    if not genre:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Genre not found",
        )

    # Check if genre has manga associated with it
    if genre.manga_list:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Cannot delete genre with associated manga. Remove manga first.",
        )

    genre = crud.genre.remove(db, id=genre_id)
    return genre