Shopify back order app

We need an app like this. we need it in PHP [login to view URL] no without a framework [login to view URL] Shopify app - We need an app made for shopify that deals with backorders and orders on the way. We want customers to buy goods that have been ordered by us by not in stock in our warehouse. We want customers to also buy goods that we have not ordered but can order once the customer has paid. Example 1. We have ordered a product (SKU123). The date of delivery to our warehouse is on 05/05/19. We want to give the customer the ability to preorder it. On our website the product (SKU123) will be highlighted as preorder and delivery will be 05/05/19. Any items in stock will automatically remove the preorder to the normal instock features. Example 2. We have not ordered a product (SKU124). We want the customer to have the ablity to back order it. On our website the product (SKU124) will show as back order and delivery is set 2 months ahead. We have a stock system that sends a stock feed to shopify which I have uploaded. The headers are SKU for the product. QTY. STOCKSTATUID which represents the type of stock and Lead time which shows when we will get the stock: Example: SKU QTY STOCKSTATUID Lead Time 123 12 1 05-05-2019 0= Not in Stock (Cannot Order) 1= In Stock 2= Back Order (Not dispatched) 3= In Transit (Dispatched) If the item is in stock (1) then shopify shows the item as normal to order If the item is in back order (2) then shopify will show the item as a backorder item with 2 months lead time. The shop button will say Back Order Now with the date available from. If the item is on the way to us (3) then shopify will show the item as preorder with the lead time date. The shop button will say Pre Order Now with the date available from. The button should take the customer to our payment process for the customer to purchase the item. Please confirm you understand the requirements by stating “I understand your Shopify app requirements” in your bid. Bids that do not state this will be ignored.