# Chapter 6 Page 71 subprocess Module
import datetime, subprocess

class Orders:
    # instance method() uses self as param1
    def __init__(self, orderID, productSKU, productPrice):
        self.orderID = orderID
        self.productSKU = productSKU
        self.productPrice = productPrice
        self.orderDate = datetime.datetime.now()

    # instance method()
    def calculate_total(self):
        qty = int( input('Enter quantity: '))
        total_price = self.productPrice * qty
        return total_price

    # instance method() with a subprocess logging
    def log_order(self):
        log_message_main = f"Order ID: {self.orderID} | Order Date: {self.orderDate}\n"
        log_message_subprocess = f"Order ID: {self.orderID} Order Date: {self.orderDate}"
        # method 1 from chapter 4 open() using the main process
        with open("log_order_mainprocess.txt", "a") as logfile:
            logfile.write(log_message_main)
        # method 2 subprocess with powershell to logging
        subprocess.run(["powershell", "-Command", f"Add-Content -Path log_order_subprocess.txt -Value \"{log_message_subprocess}\""], shell=True)

# Program Class
# Process with a subprocess
if __name__ == "__main__":
    # Create an instance of Orders Class
    order = Orders("1234", "SKU1234", 29.90)

    # Line Item Total
    total = order.calculate_total()  #  1 * 29.99  Asset 29.9

    # format for txt file
    print(f'${total:.2f}') # $125.25

    # Log the order 
    order.log_order() # both method 1 process and method 2 subprocess