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

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;

        if (!name || name.trim().length === 0) {
            req.flash("error", "Geef een naam op");
            return res.redirect("/lists");
        }

        // Check if user has a household
        if (!req.user || !req.user.household_id) {
            req.flash("error", "Je bent niet aan een huishouden gekoppeld");
            return res.redirect("/lists");
        }

        ShoppingListRepository.create({
            household_id: req.user.household_id,
            name: name.trim()
        });

        req.flash("success", "Boodschappenlijst aangemaakt");
        res.redirect("/lists");

    }

    show(req, res) {
        
        const { id } = req.params;

        const list = ShoppingListRepository.getById(id);

        if (!list) {
            return res.status(404).render("errors/404");
        }

        if (list.household_id !== req.user.household_id) {
            return res.status(403).render("errors/404");
        }

        const items = ShoppingListRepository.getItems(id);

        res.locals.title = list.name;

        res.render("lists/show", {
            list,
            items,
            user: req.user
        });

    }

    addItem(req, res) {
        
        const { id } = req.params;
        const { product_id, amount } = req.body;

        const list = ShoppingListRepository.getById(id);

        if (!list) {
            return res.status(404).json({ error: "Lijst niet gevonden" });
        }

        if (list.household_id !== req.user.household_id) {
            return res.status(403).json({ error: "Niet gemachtigd" });
        }

        const product = ProductRepository.findById(product_id);

        if (!product) {
            return res.status(404).json({ error: "Product niet gevonden" });
        }

        const quantity = Number(amount);
        if (!Number.isFinite(quantity) || quantity <= 0 || quantity > 999) {
            req.flash("error", "Vul een geldige hoeveelheid in");
            return res.redirect(`/lists/${id}`);
        }

        const item = ShoppingListRepository.addItem({
            list_id: id,
            product_id,
            amount: quantity
        });

        req.app.locals.io.to(`household:${req.user.household_id}`).emit("item:added", {
            listId: Number(id)
        });

        req.flash("success", "Product toegevoegd");

        if (req.xhr || req.headers.accept?.includes("application/json")) {
            return res.json({ success: true, item });
        }

        res.redirect(`/lists/${id}`);

    }

    toggleItem(req, res) {
        
        const { id, itemId } = req.params;

        const list = ShoppingListRepository.getById(id);

        if (!list || list.household_id !== req.user.household_id) {
            return res.status(403).json({ error: "Niet gemachtigd" });
        }

        if (!ShoppingListRepository.findItem(id, itemId)) {
            return res.status(404).json({ error: "Item niet gevonden" });
        }

        ShoppingListRepository.toggleItem(itemId);

        req.app.locals.io.to(`household:${req.user.household_id}`).emit("item:toggled", {
            listId: Number(id), itemId: Number(itemId)
        });

        if (req.xhr || req.headers.accept?.includes("application/json")) {
            return res.json({ success: true });
        }

        res.redirect(`/lists/${id}`);

    }

    deleteItem(req, res) {
        
        const { id, itemId } = req.params;

        const list = ShoppingListRepository.getById(id);

        if (!list || list.household_id !== req.user.household_id) {
            return res.status(403).json({ error: "Niet gemachtigd" });
        }

        if (!ShoppingListRepository.findItem(id, itemId)) {
            return res.status(404).json({ error: "Item niet gevonden" });
        }

        ShoppingListRepository.deleteItem(itemId);

        req.app.locals.io.to(`household:${req.user.household_id}`).emit("item:removed", {
            listId: Number(id), itemId: Number(itemId)
        });

        req.flash("success", "Product verwijderd");

        if (req.method === "DELETE" || req.xhr || req.headers.accept?.includes("application/json")) {
            return res.json({ success: true });
        }

        res.redirect(`/lists/${id}`);

    }

}

module.exports = new ShoppingListController();