const ProductRepository = require("../repositories/ProductRepository");
const ShoppingListRepository = require("../repositories/ShoppingListRepository");

class ShoppingListController {
    index(req, res) {
        const lists = ShoppingListRepository.getByHousehold(req.user.household_id);
        res.locals.title = "Boodschappenlijsten";
        res.render("lists/index", { lists, user: req.user });
    }

    create(req, res) {
        const name = (req.body.name || "").trim();
        if (!name) {
            req.flash("error", "Geef een lijstnaam op");
            return res.redirect("/lists");
        }
        ShoppingListRepository.create(req.user.household_id, name);
        req.flash("success", "Boodschappenlijst aangemaakt");
        res.redirect("/lists");
    }

    show(req, res) {
        const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
        if (!list) return res.status(404).render("errors/404");
        res.locals.title = list.name;
        res.render("lists/show", {
            list,
            items: ShoppingListRepository.getItems(list.id),
            products: ProductRepository.getAll(),
            user: req.user
        });
    }

    addItem(req, res) {
        const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
        const productId = Number.parseInt(req.body.product_id, 10);
        const amount = Number.parseFloat(req.body.amount || "1");
        const product = Number.isInteger(productId) ? ProductRepository.findById(productId) : null;
        if (!list || !product || !Number.isFinite(amount) || amount <= 0) {
            req.flash("error", "Ongeldig product of ongeldige hoeveelheid");
            return res.redirect(`/lists/${req.params.id}`);
        }
        ShoppingListRepository.addItem(list.id, product.id, amount);
        res.redirect(`/lists/${list.id}`);
    }

    toggleItem(req, res) {
        const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
        if (!list) return res.status(404).render("errors/404");
        ShoppingListRepository.toggleItem(list.id, req.params.itemId);
        this.broadcastUpdate(req, list.id);
        res.redirect(`/lists/${list.id}`);
    }

    deleteItem(req, res) {
        const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
        if (!list) return res.status(404).json({ error: "Lijst niet gevonden" });
        const result = ShoppingListRepository.deleteItem(list.id, req.params.itemId);
        if (result.changes === 0) return res.status(404).json({ error: "Product niet gevonden" });
        this.broadcastUpdate(req, list.id);
        res.json({ success: true });
    }

    broadcastUpdate(req, listId) {
        if (req.app.locals.io) {
            req.app.locals.io.to(`list:${listId}`).emit("list:updated", { listId });
        }
    }
}

module.exports = new ShoppingListController();