import { Ressources } from "@/class/class";
import { db } from "@/firebase_config";
import { doc, runTransaction, increment, arrayUnion } from "firebase/firestore";

export async function borrowRessource(chantierId: string, ressource: Ressources, quantity: number) {
    const chantierRef = doc(db, "chantier", chantierId);
    const ressourceRef = doc(db, "ressources", ressource.id.toString());
    await runTransaction(db, async (transaction) => {
        const resSnap = await transaction.get(ressourceRef);
        if (!resSnap.exists()) throw new Error("Ressource not found");

        const available = resSnap.data().available_quantity;
        if (available < quantity) throw new Error("Not enough quantity available");

        transaction.update(ressourceRef, {
            available_quantity: increment(-quantity),
        });

        const borrowed: Ressources = { ...ressource, quantity };
        transaction.update(chantierRef, {
            vehicules: arrayUnion(borrowed),
        });
    });
}