from typing import List

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

from app.db.models import Category
from app.db.session import get_db
from app.schemas.inventory import Category as CategorySchema
from app.schemas.inventory import CategoryCreate, CategoryUpdate

router = APIRouter()

@router.get("/", response_model=List[CategorySchema])
def get_categories(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    categories = db.query(Category).offset(skip).limit(limit).all()
    return categories

@router.get("/{category_id}", response_model=CategorySchema)
def get_category(category_id: int, db: Session = Depends(get_db)):
    category = db.query(Category).filter(Category.id == category_id).first()
    if not category:
        raise HTTPException(status_code=404, detail="Category not found")
    return category

@router.post("/", response_model=CategorySchema)
def create_category(category: CategoryCreate, db: Session = Depends(get_db)):
    existing_category = db.query(Category).filter(Category.name == category.name).first()
    if existing_category:
        raise HTTPException(status_code=400, detail="Category name already exists")

    db_category = Category(**category.dict())
    db.add(db_category)
    db.commit()
    db.refresh(db_category)
    return db_category

@router.put("/{category_id}", response_model=CategorySchema)
def update_category(category_id: int, category: CategoryUpdate, db: Session = Depends(get_db)):
    db_category = db.query(Category).filter(Category.id == category_id).first()
    if not db_category:
        raise HTTPException(status_code=404, detail="Category not found")

    update_data = category.dict(exclude_unset=True)
    for field, value in update_data.items():
        setattr(db_category, field, value)

    db.commit()
    db.refresh(db_category)
    return db_category

@router.delete("/{category_id}")
def delete_category(category_id: int, db: Session = Depends(get_db)):
    db_category = db.query(Category).filter(Category.id == category_id).first()
    if not db_category:
        raise HTTPException(status_code=404, detail="Category not found")

    db.delete(db_category)
    db.commit()
    return {"message": "Category deleted successfully"}