Programmer Milk

ProgrammerMilk.java

// Inspired by the joke: 
// "A programmer was walking out the door for work when 
// his wife said, 'While you're out, buy some milk.' 
// The programmer never came home.

programmer.getToDoList().getLocationList().addItem(Location.ANYWHERE, () -> {programmer.moveTo(Location.SUPERMARKET);});
programmer.getToDoList().getLocationList().addItem(Location.SUPERMARKET, (neededAmount) -> {
    
    // Get the price and inventory from the Economy.
    double price = Economy.getStore(Store.SUPERMARKET).getInventory().getItemClass(ItemClass.MILK).getPrice();
    int milkInv = Economy.getStore(Store.SUPERMARKET).getInventory().getItemClass(ItemClass.MILK).getCount();
    
    // Define the item itself.
    Item milk;
    
    // Define the quantity var
    int quantity;
    
    // Make sure the store HAS milk, and enough.
    if (milkInv == 0) {
        throw new IndexOutOfBoundsException("There is no milk to get!");
    } else if (milkInv < neededAmount) {
        // Not enough milk, but get what they have.
        quantity = milkInv;
    } else {
        // There's enough milk
        quantity = neededAmount;
    }
    
    // Check that the programmer has enough money to buy the requested milk.
    if (programmer.getMoney() >= price * quantity) {
        // Actually buy the milk
        milk = Economy.getStore(Store.SUPERMARKET).buy(ItemClass.MILK, quantity);
        milk.moveTo(Location.HOME);
    } else {
        // The programmer doen't have enough money to buy all the requested milk. Get as much as we can.
        if (programmer.getMoney() < price) {
            // The programmer is broke af, or milk is expensive af.
            throw new NoMoneyException();
        } else {
            // Get what little milk we can get.
            int maxBuyable = Math.floor(programmer.getMoney() / price);
            if (maxBuyable < quantity) {
                quantity = maxBuyable;
            }
            milk = Economy.getStore(Store.SUPERMARKET).buy(ItemClass.MILK, quantity);
            milk.moveTo(Location.HOME);                    
        }
    }
});