Kalah Game API

Getting stated

Prerequisites

• Java version 8 or higher
• git
• Maven

Get the code:

git clone [email protected]:daiLlew/kalah-api.git

Build the code

mvn clean package

Run the app

java -jar target/kalah-api-1.0-SNAPSHOT.jar

Once the app has started it will be running on http://localhost:8080/games.

How to play

Create a new game:

curl --header "Content-Type: application/json" --request POST http://localhost:8080/games

Returns response:

{
  "id": 1,
  "uri": "http://localhost:8080/games/1"
}

Get the game status:

curl --header "Content-Type: application/json" --request GET http://localhost:8080/games/1/status

Returns response:

{
  "gameId": 1,
  "state": "CREATED",
  "playerTurn": "player-1"
}

If the game has ended the status response will also include details about the winner & points.

Making a move:

curl --header "Content-Type: application/json" --header "Player-Id: player-1" --request PUT http://localhost:8080/games/1/pits/1

Returns response:

{
  "uri": "http://localhost:8080/games/1",
  "id": 1,
  "status": {
    "1": 0,
    "2": 7,
    "3": 7,
    "4": 7,
    "5": 7,
    "6": 7,
    "7": 7,
    "8": 6,
    "9": 6,
    "10": 6,
    "11": 6,
    "12": 6,
    "13": 6,
    "14": 6
  }
}

After each turn use the GET:/game/{id}/status endpoint to determined who's turn it is & the current state of the game.

Note: You must provide the request header Player-Id with value player-1 or player-2. If no header or an invalid header is provided you will get a resopnse similar to:

{
  "timestamp": "2019-08-15T18:49:12.763+0000",
  "status": 400,
  "error": "Bad Request",
  "message": "Missing request header 'Player-Id' for method parameter of type String",
  "path": "/games/1/pits/1"
}

A player can only execute a move successfully on their turn. If you attempt to make a move during the other players turn or you make an invalid move you'll get an error response similar to:

{
  "timestamp": "2019-08-15T18:46:22.430+0000",
  "status": 400,
  "error": "Bad Request",
  "message": "cannot move stone from an empty pit",
  "path": "/games/1/pits/1"
}

Determining the winner

To determined if the game is over and which player won use status endpoint (see previous example).

Debugging

After each move the server log will include a simple representation of the current game state: This can be useful for debugging issues or getting clear idea of the current state of play.

DEBUG

| Game ID   | Current Player | State      |
+           +                +            +
| 1         | ONE            | IN_PROGRESS|
+           +                +            +

Pits:
        (13,6) (12,6) (11,6) (10,6) (9,6)  (8,6)

 (14,6)                                           (7,7)

        (1,0)  (2,7)  (3,7)  (4,7)  (5,7)  (6,7)

The format is ($PIT_ID, $STONE_COUNT) -> (1,0) Pit 1 has 0 stones.