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.Author])
def read_authors(
    db: Session = Depends(deps.get_db),
    skip: int = 0,
    limit: int = 100,
) -> Any:
    """
    Retrieve authors.
    """
    authors = crud.author.get_multi(db, skip=skip, limit=limit)
    return authors


@router.post("/", response_model=schemas.Author)
def create_author(
    *,
    db: Session = Depends(deps.get_db),
    author_in: schemas.AuthorCreate,
) -> Any:
    """
    Create new author.
    """
    author = crud.author.get_by_name(db, name=author_in.name)
    if author:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="An author with this name already exists.",
        )
    author = crud.author.create(db, obj_in=author_in)
    return author


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


@router.put("/{author_id}", response_model=schemas.Author)
def update_author(
    *,
    db: Session = Depends(deps.get_db),
    author_id: int,
    author_in: schemas.AuthorUpdate,
) -> Any:
    """
    Update an author.
    """
    author = crud.author.get(db, id=author_id)
    if not author:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Author not found",
        )

    # Check if updating to an existing name
    if author_in.name and author_in.name != author.name:
        existing_author = crud.author.get_by_name(db, name=author_in.name)
        if existing_author:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="An author with this name already exists.",
            )

    author = crud.author.update(db, db_obj=author, obj_in=author_in)
    return author


@router.delete("/{author_id}", response_model=schemas.Author)
def delete_author(
    *,
    db: Session = Depends(deps.get_db),
    author_id: int,
) -> Any:
    """
    Delete an author.
    """
    author = crud.author.get(db, id=author_id)
    if not author:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Author not found",
        )

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

    author = crud.author.remove(db, id=author_id)
    return author