getIngredientQuality

    public int getIngredientQuality(BRecipe recipe) {
        float quality = 10;
        int count;
        int badStuff = 0;
        if (recipe.isMissingIngredients(ingredients)) {
            // when ingredients are not complete
            return -1;
        }
        ArrayList<Material> mergedChecked = new ArrayList<Material>();
        for (ItemStack ingredient : ingredients) {
            if (mergedChecked.contains(ingredient.getType())) {
                // This ingredient type was already checked as part of a merged material
                continue;
            }
            int amountInRecipe = recipe.amountOf(ingredient);
            // If we dont consider durability for this ingredient, check the merged material
            if (recipe.hasExactData(ingredient)) {
                count = ingredient.getAmount();
            } else {
                mergedChecked.add(ingredient.getType());
                count = materials.get(ingredient.getType());
            }
            if (amountInRecipe == 0) {
                // this ingredient doesnt belong into the recipe
                if (count > (getIngredientsCount() / 2)) {
                    // when more than half of the ingredients dont fit into the
                    // recipe
                    return -1;
                }
                badStuff++;
                if (badStuff < ingredients.size()) {
                    // when there are other ingredients
                    quality -= count * (recipe.getDifficulty() / 2);
                    continue;
                } else {
                    // ingredients dont fit at all
                    return -1;
                }
            }
            // calculate the quality
            quality -= ((float) Math.abs(count - amountInRecipe) / recipe.allowedCountDiff(amountInRecipe)) * 10.0;
        }
        if (quality >= 0) {
            return Math.round(quality);
        }
        return -1;
    }