private short calcTime(int amount, string resource, string heroResource,
            int baseWood, int baseClay, int baseIron, int baseCrop)
        {
            short heroProduction = short.Parse(txtRes.Text);
            short woodProduction = short.Parse(txtWoodHour.Text);
            short clayProduction = short.Parse(txtClayHour.Text);
            short ironProduction = short.Parse(txtIronHour.Text);
            short cropProduction = short.Parse(txtCropHour.Text);
            switch (resource)
            {
                case "wood":
                    // How fast can I gather wood
                    if (heroResource == "wood")
                    {
                        return Convert.ToInt16(amount / (baseWood - Convert.ToInt32(txtRes.Text) * 10));
                    }
                    else if (heroResource == "all")
                    {
                        return Convert.ToInt16(amount / (baseWood - Convert.ToInt32(txtRes.Text) * 3));
                    }
                    else
                    {
                        return Convert.ToInt16(amount / baseWood);
                    }
                case "clay":
                    // How fast can I gather clay
                    if (heroResource == "clay")
                    {
                        return Convert.ToInt16(amount / (baseClay - Convert.ToInt32(txtRes.Text) * 10));
                    }
                    else if (heroResource == "all")
                    {
                        return Convert.ToInt16(amount / (baseClay - Convert.ToInt32(txtRes.Text) * 3));
                    }
                    else
                    {
                        return Convert.ToInt16(amount / baseClay);
                    }
                case "iron":
                    // How fast can I gather iron
                    if (heroResource == "iron")
                    {
                        return Convert.ToInt16(amount / (baseIron - Convert.ToInt32(txtRes.Text) * 10));
                    }
                    else if (heroResource == "all")
                    {
                        return Convert.ToInt16(amount / (baseIron - Convert.ToInt32(txtRes.Text) * 3));
                    }
                    else
                    {
                        return Convert.ToInt16(amount / baseIron);
                    }
                case "crop":
                    // How fast can I gather crop
                    if (heroResource == "crop")
                    {
                        return Convert.ToInt16(amount / (baseCrop - Convert.ToInt32(txtRes.Text) * 10));
                    }
                    else if (heroResource == "all")
                    {
                        return Convert.ToInt16(amount / (baseCrop - Convert.ToInt32(txtRes.Text) * 3));
                    }
                    else
                    {
                        return Convert.ToInt16(amount / baseCrop);
                    }
                default:
                    // Wrong input
                    MessageBox.Show("Wrong input to calcTime(" + heroResource + ")", "Error");
                    return 0;
            }
        }