Authenticated customers (username = customer)should be able to buy products. Authenticated admin(username=admin) should be able to re-stock products.

Customers buy products by searching for them. The url to the search page is shop/search. The HTML table reporting the products matching the search includes each products Id, and clicking on the Id should take the customer to the purchase section of the website. The search page should have table with the product name, amount in stock and id, the id in the table should be a url to the buy page. The buy page url is shop/buy/Id (the id is a number of the product). It is linked from the HTML table returned by the search.

The heading for the page should be, How many of Id would you like to buy from your-login. The Id is the product Id that the customer clicked on in the search results table. There should be a text box where the number of items desired is entered, and a buy button.

Your website should then check that the desired number are indeed in stock, then decrement the number purchased in the Stock database table. The customer should know if they failed or succeeded.

An authenticated admin can restock items. This is done with: shop/restock/Id

The Id is the item to be restocked. There should be a text box where the number to be added can be entered, and a restock button. The Stock database table should then be updated.

Make sure the product Id exists and users are authenticated.