# Chapter5.py

# syntax errors "code is not typed to requirements" programmer / coder
# runtime errors "code typed without error BUT program can't start"  exit code 1 fail developer "maps out app"
# exception errors 'Exception Handlers"  runs but during the execution of "operation" fails
# Unit Testing or Assertion Errors  Backend Developer / Unit Tester
## 4 + 2 * 8 = Assert 48  Credit Card was charged 48 But actual was 20 LOST $28
# 4 + 2 * 8 actual 20   qty + qty * price
# (4 + 2) * 8 expected 48 (qty + qty) * price
# UI/UX Tester -> workflow

# Define a function to calculate a formula
# exception handling using try keyword

def cartTotalCalc():
    try:
        # try step 1 pass or fail
        # Step 1 Ask the user for qty desired
        inputQuantity = int(input("Enter quantity: ")) # int

        # try step 2 pass or fail
        # Step 2 Get the price for the product
        productPrice = 25.52 # Chapter7 come from csv file
        ## file i/o error handle with except

        # Step 3 Calculate the line item total
        lineItemTotal = inputQuantity * productPrice

        # Step 4 Calculate tax
        ## tax rate 7%
        ## (7 / 100)
        taxrate = 7  # 7%
        taxcalc = taxrate / 100
        subTotal = lineItemTotal + (lineItemTotal * taxcalc)
       
        # Step 5 Calculate Shipping
        """
        0-10  $9.95   if 
        10.01-25 $12.95 elif
        over 25 $ 19.95 else
        """
        if (subTotal > 0 and subTotal <= 10):
            varShippingCost = 9.95
        elif (subTotal > 10 and subTotal <= 25):
            varShippingCost = 12.95
        else:
            varShippingCost = 19.95

        # Step 6 Calculate Cart Total
        varCartTotal = subTotal + varShippingCost
        print("Cart Information")
        print("================")
        print(f"Quantity: {inputQuantity} Price: {productPrice}")
        print(f"Shipping Cost: {varShippingCost}")
        print("Cart Total: " + str(varCartTotal))

    # Possible Issues
    except TypeError as err:
        print("You entered an invalid data type.")
        print(err)
    except ZeroDivisionError:
        print("Can not divide a number by zero.")
    except Exception as err:
        print("Something went wrong.")
        print(err)

    finally:  # pass or fail
        print("Thank you for using our program.")