expenses.py

import json
from datetime import datetime
import calendar
from pathlib import Path

def load_expenses(expenses_file):
    expenses_file_exists = Path(expenses_file).is_file()

    if expenses_file_exists:
        with open(expenses_file, "r") as file:
            expenses = json.load(file)

    else:
        with open(expenses_file, "w") as file:
            expenses = json.dump({ "expenses": [] }, file, indent = 4)
        with open(expenses_file, "r") as file:
            expenses = json.load(file)

    return expenses

def list_expenses(expenses_list):
    print("ID    Date       Amount     Description")
    print("---------------------------------------")
    if len(expenses_list) < 1:
        print("No expenses!")
    else:
        for expense in expenses_list:
            print(f"{expense["id"]}     {expense["date"]}  {expense["amount"]}     {expense["description"]}")


def save_expenses(expenses_file, expenses):
    with open(expenses_file, "w") as file:
        json.dump(expenses, file, indent=4)

def find_date():
    day = datetime.now().day
    month = datetime.now().month
    year = datetime.now().year

    return f"{day}/{month}/{year}"

def find_month_from_date(date):
    return int( date.split("/")[1] )

def find_greatest_id(expenses_list):
    greatest_id = 0
    for expense in expenses_list:
        if expense["id"] > greatest_id:
            greatest_id = expense["id"]

    return greatest_id + 1

def add_expense(expenses_list, description, amount):
    id = find_greatest_id(expenses_list)
    date = find_date()

    expenses_list.append(
        {
            "id": id,
            "description": description,
            "amount": amount,
            "date": date
        }
    )

def remove_expense(expenses_list, target_expense_id):
    expense_exists = False

    for expense in expenses_list:
        if expense["id"] == target_expense_id:
            expenses_list.remove(expense)
            expense_exists = True

    if not expense_exists:
        print(f"Expense with the ID {target_expense_id} has not been found.")

def summarize_expenses(expenses_list, month = None):
    total_expenses = 0

    if month:
        month_name = calendar.month_name[month]

        for expense in expenses_list:
            expense_date = find_month_from_date(expense["date"])
            if expense_date == month:
                total_expenses = total_expenses + int( expense["amount"] )

        if total_expenses > 0:
            print(f"Total expenses for {month_name}: {total_expenses}")
        else:
            if month < 1:
                print(f"The month with the number {month} does NOT exist!")
            else:
                print(f"There is not expenses for the month {month_name}!")
    else:
        for expense in expenses_list:
            total_expenses = total_expenses + int( expense["amount"] )
        print(f"Total expenses: {total_expenses}")