Create a Python class named Product with a $\_\_$init $\_$ method that accepts three parameters: name $($a string$),$ price $($a positive float$),$ and quantity $($an integer$).$ Initialize these attributes in the current object. Next, implement a method called get$\_$info that returns a formatted string in the following way: "Product: name, Price: $price, Quantity: quantity". For example, if $p=$ Product$("$Laptop$",999\mathrm{.}99,5),$ then p$.$get$\_$info$()$ should return "Product: Laptop, Price: $$999\mathrm{.}99,$ Quantity: $5".$

Additionally, define a method called calculate$\_$total that calculates and returns the total cost of the products by multiplying the price and quantity.

Constraints:

$-$The name parameter should be a non$-$empty string.

The price parameter should be a positive float $($greater than zero$).$

$-$The quantity parameter should be a non$-$negative integer $($zero or greater$).$

Python