# CPDual

CPDual is a web application for competitive programming duels, allowing users to challenge each other to solve Codeforces problems in real time.

## Features

- User registration and login with Codeforces handle verification
- Challenge system: send, accept, reject, and complete duels
- Automatic problem selection based on user ratings and unsolved problems
- Rating updates after each duel
- Daily update of Codeforces problemset
- JWT-based authentication

## Project Structure

```
.
├── Controller/
├── Routes/
├── config/
├── middleware/
├── model/
├── utils/
├── QuestionDecider/
├── ratingUpdation/
├── index.js
├── package.json
├── .env
```

## Getting Started

### Prerequisites

- Node.js (v16+)
- MongoDB instance (local or cloud)

### Installation

1. Clone the repository:

   ```sh
   git clone <repo-url>
   cd CpDual
   ```

2. Install dependencies:

   ```sh
   npm install
   ```

3. Create a `.env` file in the root directory with the following variables:

   ```
   MONGODB_URI=your_mongodb_connection_string
   ACCESS_TOKEN_SECRET=your_jwt_secret
   SYSTEM_JWT_SECRET=your_system_jwt_secret
   ADMIN_TOKEN=your_admin_token
   NODE_ENV=development
   PORT=3000
   ```

4. Start the server:
   ```sh
   npm start
   ```

## API Endpoints

- `POST /api/dashboard/register` - Register a new user
- `POST /api/dashboard/login` - Login user
- `GET /api/dashboard/info/:handle` - Get user dashboard info
- `POST /api/challenge/send` - Send a challenge
- `POST /api/challenge/accept` - Accept a challenge
- `POST /api/challenge/reject` - Reject a challenge
- `POST /api/challenge/complete` - Complete a challenge

## License

ISC

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For more details, see the source code in [index.js](index.js) and