tracker.py

import json
from datetime import datetime

class ExpenseTracker:
    def __init__(self):
        self.expenses = []
    def add_expense(self, amount, category):
        expense = {
            "amount" : amount,
            "category" : category,
            "date" : datetime.now().strftime("%Y-%m-%d")
        }
        self.expenses.append(expense)

    def total_expense(self):
        total = 0
        for expense in self.expenses:
            total += expense["amount"]  
        return total  
    
    def filter_by_category(self, category):
        result = []
        for expense in self.expenses:
            if expense["category"].lower() == category.lower():
                result.append(expense)
        return result
    
    def save_to_file(self):
        with open("expenses.json", "w") as file:
            json.dump(self.expenses, file, indent=4, sort_keys=True)

    def load_from_file(self):
        try:
            with open("expenses.json", "r") as file:
                self.expenses = json.load(file)
        except FileNotFoundError:
            self.expenses = []

    def show_all(self):
        if not self.expenses:
            print("No expenses found.")
            return
        for exp in self.expenses:
            print(f"{exp['date']} | {exp['category']} | ₹{exp['amount']:.2f}")

    def category_summary(self):
        summary = {}
        for exp in self.expenses:
            cat = exp["category"]
            summary[cat] = summary.get(cat, 0) + exp["amount"]

        for cat, amt in summary.items():
            print(f"{cat}: ₹{amt:.2f}")