[NOTE]: As of 1 Aug 2024, I have stopped the AWS EC2 instance. This repository will remain available.

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Coin Change Calculator

1. Description

REST API webservice that calculates minimum number of coins needed to make up a target amount. Deployed on AWS EC2.

The inputs are:

• Target amount – amount of money you need to make up to. Target amount must be within the range between 0 and 10,000.00.
• Coin denominations – a list of coin denominations to be used to make up the target amount. Coin denomination must be one of the following values [0.01, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 50, 100, 1000].

It returns a JSON that states the target amount, coin denominations, and the minimum number of coins required to get the target amount e.g., {"targetAmount":"1250.00","coinDenominations":[1000.0,100.0,50.0],"minimumCoins":{"1000.0":1,"100.0":2,"50":1}}.

This repository contains the project files for the frontend (React.js) and backend (Java 17, Spring Boot).

*Disclaimer

The project is not fully fleshed out, and is still lacking the following:

1. Backend Validations
2. Comprehensive Backend Tests
3. Frontend (Mobile) Validations
4. Frontend (Web/Mobile) Tests

2. Building and running the web service locally using project files and Docker Desktop (No IDE Required)

Git Clone

1. In your target directory, run

   git clone git@github.com:zephyrdark/SA58_AlvinLee_Fibonacci.git
   

Full Web-App (Frontend React.js + Backend Spring)

2. Ensure that your Docker Desktop is running.
3. Change directory to /SA58_AlvinLee_Fibonacci/.
4. Build the Wep-App by running:

   docker compose up --build
   

5. The frontend will be available at http://localhost:3000, and it is hardcoded to access its accompanying backend at http://localhost:8080.
6. If you want, you can also use Postman to test the APIs as described in Various Usages.

3. Various Usages

• Test the api via frontend UI at PROTOCOL://IP-ADDRESS:3000/

• Test the api via backend at Postman

  Example POST Request: PROTOCOL://IP-ADDRESS:8080/api/coin-request, HTTP Body, raw, JSON:

  {
      "targetAmount": 1250.0,
      "coinDenominations": [1000.0,100.0,50.0]
  }
  

  Expected POST Response on Status 200 OK:

  {
      "targetAmount": "1250.0",
      "coinDenominations": [
          "1000.0",
          "100.0",
          "50.0"
      ],
      "minimumCoins": {
          "1000.0": 1,
          "100.0": 2,
          "50.0": 1
      }
  }
  

• Access the api via command line

  • Linux:

  curl -H "Accept: application/json" -H "Content-type: application/json" -X POST -d '{"targetAmount": 1250.0,"coinDenominations": [1000.0,100.0,50.0]}' PROTOCOL://IP-ADDRESS:8080/api/coin-request
  

  

• Cloning and building your own project.

4. Deploying your application to the cloud

Consult Docker's getting started docs for more detail on building and pushing.

You will need to make adjustments to the hardcoded IP-ADDRESS used for axios in SA58_AlvinLee_Fibonacci/frontend-react/src/CoinRequest.js's submit().

5. Docker Image

Docker image of this project is automatically build and pushed using GitHub Actions workflow, and is available at https://hub.docker.com/repository/docker/alvinlee24/fibonacci-coins/general.