munch-ease-frontend/src/components/shopping/shopping.js

export function mealToShoppingListSources(meal) {
    const sources = [];
    for (const recipe of meal.recipes) {
        for (const ingredient of recipe.ingredients) {
            sources.push({ ingredient, meal, recipe, });
        }
    }

    for (const ingredient of meal.extra_ingredients) {
        sources.push({ ingredient, meal, });
    }

    return sources;
}

export function requestsToSources(requests) {
    const sources = [];
    for (const request of requests) {
        if (request.ingredient) {
            sources.push(request);
        }
        else if (request.meal) {
            sources.push(...mealToShoppingListSources(request.meal));
        }
    }

    return sources;
}

export function removeMealFromShoppingListSources(sources, meal) {
    return sources.filter(source => source.meal?.id !== meal.id);
}

export function groupByProduct(sources) {
    const noProductKey = "no-product";
    const noProduct = { name: "No product", };

    const grouped = {};
    for (const source of sources) {
        const key = source.ingredient?.product?.id ?? noProductKey;
        if (!key) {
            continue;
        }

        if (!grouped[key]) {
            grouped[key] = {
                product: source.ingredient.product ?? noProduct,
                sources: [],
            };
        }

        grouped[key].sources.push(source);
    }

    return Object.values(grouped);
}