💰 ExpenseTracker App

ExpenseTracker is a simple yet powerful personal finance management app built using Jetpack Compose and Room Database.
It helps users track their expenses, income, and transfers, analyze spending habits with interactive charts, and get smart notifications for budgeting.

---

🖼️ Screenshots

📱 App Screenshots

🏠 Home Screen	➕ Add Transaction	📊 Analysis Screen

📉 Analysis (No Data)	🔔 Notification Example

---

🚀 Features

✅ Add, Edit & Delete Transactions — manage income, expense, and transfer records easily.
✅ Category-based Expense Visualization — view detailed category charts using PieChart (MPAndroidChart).
✅ Room Database Integration — ensures offline access and fast local storage.
✅ Smart Notifications (via WorkManager):

• ⚠️ Balance below ₹100 alert
• 💸 Monthly expense exceeds ₹2000
• 🧾 Every ₹5000 spending threshold
• 💳 Expense exceeds income warning
• 🕒 No transactions added today reminder
  ✅ Modern UI — fully built with Jetpack Compose and Material 3.
  ✅ Dark/Light Theme Support (optional for UI extension).

---

🧠 Architecture Overview

The app follows the MVVM (Model–View–ViewModel) architecture pattern, ensuring a clean separation of concerns and improved testability.

🏗️ Layers Breakdown

1️⃣ Model Layer

• Contains data classes such as Transaction.
• Uses Room Database (AppDatabase, TransactionDao) for local persistence.
• The Repository (TransactionRepository) handles data access logic and provides a single source of truth for ViewModels.

2️⃣ ViewModel Layer

• TransactionViewModel acts as a bridge between UI and data layers.
• Uses Kotlin Coroutines and StateFlow for real-time data updates.
• Handles business logic like calculating balance, filtering transactions, and triggering notifications.

3️⃣ View (UI) Layer

• Built with Jetpack Compose for a modern declarative UI.
• Screens:
  • 🏠 HomeScreen — Displays current balance, income, and recent transactions.
  • ➕ AddTransactionScreen — Allows users to add or edit transactions with category and payment mode selection.
  • 📊 AnalysisScreen — Shows monthly spending insights with pie charts and category-wise analysis.

⚙️ Supporting Components

• WorkManager: Schedules daily background tasks for notification alerts.
• NotificationHelper: Manages Android notification channels and triggers budget alerts.
• Material3 Components: Provides a consistent, modern design system.

---

🧩 This architecture ensures:

• Clean and scalable codebase.
• Reactive and real-time UI updates.
• Easy maintainability and testing.