from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from app.db.session import SessionLocal
from app.schemas.inventory import InventoryItemCreate, InventoryItemOut, InventoryItemUpdate
from app.crud.inventory import (
    get_inventory_item,
    get_inventory_items,
    create_inventory_item,
    update_inventory_item,
    delete_inventory_item,
)

router = APIRouter()

# Dependency
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

@router.post("/", response_model=InventoryItemOut)
def create_item(item_in: InventoryItemCreate, db: Session = Depends(get_db)):
    item = create_inventory_item(db, item_data=item_in.model_dump())
    return item

@router.get("/", response_model=list[InventoryItemOut])
def list_items(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    return get_inventory_items(db, skip=skip, limit=limit)

@router.get("/{item_id}", response_model=InventoryItemOut)
def get_item(item_id: int, db: Session = Depends(get_db)):
    item = get_inventory_item(db, item_id)
    if not item:
        raise HTTPException(status_code=404, detail="Inventory item not found")
    return item

@router.put("/{item_id}", response_model=InventoryItemOut)
def update_item(item_id: int, updates: InventoryItemUpdate, db: Session = Depends(get_db)):
    item = get_inventory_item(db, item_id)
    if not item:
        raise HTTPException(status_code=404, detail="Inventory item not found")
    return update_inventory_item(db, item, updates.model_dump(exclude_unset=True))

@router.delete("/{item_id}")
def delete_item(item_id: int, db: Session = Depends(get_db)):
    item = get_inventory_item(db, item_id)
    if not item:
        raise HTTPException(status_code=404, detail="Inventory item not found")
    delete_inventory_item(db, item)
    return {"ok": True}