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# Expense Tracker

A React Native mobile application for tracking personal expenses.

## Prerequisites

- Node.js (v14 or newer)  
- npm or yarn  
- Xcode (for iOS development)  
- Android Studio (for Android development)  
- Expo CLI  

## Installation

1. Install dependencies:  
```bash
npm install
# or
yarn install

2. Create a .env file in the root directory with your Firebase configuration. You can use the .env.example file as a template:

EXPO_PUBLIC_FIREBASE_API_KEY=your_api_key
EXPO_PUBLIC_FIREBASE_AUTH_DOMAIN=your_auth_domain
EXPO_PUBLIC_FIREBASE_PROJECT_ID=your_project_id
EXPO_PUBLIC_FIREBASE_STORAGE_BUCKET=your_storage_bucket
EXPO_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=your_messaging_sender_id
EXPO_PUBLIC_FIREBASE_APP_ID=your_app_id

Firebase Setup

• Make sure you have created Firestore indexes for the following queries to work properly:

  • Collection expenses with indexes on userId (Ascending), date (Descending), and __name__ (Descending)
  • Collection expenses with indexes on category (Ascending), userId (Ascending), date (Descending), and __name__ (Descending)

Running the App

iOS Simulator

npm run ios
# or
yarn ios

Android Emulator

npm run android
# or
yarn android

Development Server

npm start
# or
yarn start

Running on a real device

• For iOS devices, make sure your Apple developer certificates and provisioning profiles are properly configured in Xcode.
• For Android devices, enable USB debugging and connect the device via USB or use wireless debugging.

Project Structure

src/
  ├── components/     # Reusable components
  ├── navigation/     # Navigation configuration
  ├── screens/        # Screen components
  ├── services/       # API and service functions
  ├── store/          # State management
  ├── types/          # TypeScript type definitions
  └── utils/          # Utility functions

Features

• User authentication
• Expense tracking
• Category management
• Expense history
• Profile management

Tech Stack

• React Native with Expo
• TypeScript for type safety
• Firebase Authentication and Firestore
• React Navigation for routing
• React Native Paper for UI components
• Zustand for state management
• Date-fns for date formatting

Known Limitations

• Limited offline support
• No data export functionality
• No multi-language support

Future Improvements

• Add data visualization (charts, graphs)
• Implement budget planning
• Add recurring expenses
• Support for more currencies
• Offline mode with data sync
• Export data to CSV/PDF
• Dark mode support

Contributing