umar482 / slot_machine

Slot Machine

Demo Link

https://slot-machine-softaims.herokuapp.com/

Description

The application is built using latest Rails 7.0 for backend server and React 18 for the front-end application. The database used is pgSQL.

How to run the application

Clone this repo

Running the backend server

Step 1: cd slot-machine Step 2: Run the following commands

• bundle install
• bin/dev

Now the server will be live and accessible from port 3000. [http://localhost:3000]

Testing the backend

Run the below command to run all test cases for the application

• bundle exec rspec

Testing the frontend

Test cases for react are pending for now. If you say so, they can also be added in one day time.

Assumptions

• When a player starts a game/session, they are allocated 10 credits.
• Pulling the machine lever (rolling the slots) costs 1 credit.
• The game screen has 1 row with 3 blocks.
• For player to win the roll, they have to get the same symbol in each block.
• There are 4 possible symbols:
  • cherry (10 credits reward)
  • lemon (20 credits reward)
  • orange (30 credits reward)
  • watermelon (40 credits reward)
• The game (session) state has to be kept on server.
• If the player keeps winning, they can play forever, but there is some probabilty of re-rolling if they keep hitting jackpot.

Server Side

• When a user has less than 40 credits in the game session, their rolls are truly random.
• If a user has between 40 and 60 credits, then the server begins to slightly cheat:
  • For each winning roll, before communicating back to client, the server does one 30% chance roll which decides if server will re-roll the that round.If that roll is true, then server re-rolls and communicates the new result back.
  • If user has above 60 credits, the server acts the same, but in this case the chance of re-rolling the round increases to 60%. If that roll is true, then server re-rolls and communicates the new result back.
• There is a cash-out endpoint will set the session credit to zero and user can't continue after that.

Design decisions

• I have used Redux for global state management of React application.
• Business rules:
  • A session is maintained for a user that keep track of the credit as he plays the game.

Future Enhancements

• We can implement user model by using passwordless gem to keep track of user's credit and session. Right now, the session is being maintained for the user that keep track of the user's credit.
• We can also implement Serializer that can make our response more formated and to send more defined response bake to server. As it is a one page application that's why it is not used at the time, but as the app have the flexibilty to enhance this can be very helpful then.