from typing import List
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from app.db.session import get_db
from app.models.category import Category
from app.schemas.category import (
    Category as CategorySchema,
    CategoryCreate,
    CategoryUpdate,
)

router = APIRouter(prefix="/categories", tags=["categories"])


@router.get("/", response_model=List[CategorySchema])
def get_categories(
    skip: int = Query(0, ge=0),
    limit: int = Query(100, ge=1, le=1000),
    db: Session = Depends(get_db),
):
    return db.query(Category).offset(skip).limit(limit).all()


@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)
    if "name" in update_data:
        existing_category = (
            db.query(Category)
            .filter(Category.name == update_data["name"], Category.id != category_id)
            .first()
        )
        if existing_category:
            raise HTTPException(status_code=400, detail="Category name already exists")

    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"}