From de78893aec1d5a4a0ae84610f2f01f78e9455f18 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Fri, 29 May 2020 17:16:33 -0700
Subject: [PATCH] Add new game.js with a new parent class Game

This new parent is now extended by our two game classes: Empires and
TicTacToe. There's not yet any real functionality in the Game class
yet, (just storage of the name of the engine). But this will give us a
place to lodge some common functionality as we aim to reduce code
duplication.
---
 empires.js   | 10 +++++++---
 game.js      |  8 ++++++++
 tictactoe.js |  8 ++++++--
 3 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100644 game.js

diff --git a/empires.js b/empires.js
index 7907ce0..749f26e 100644
--- a/empires.js
+++ b/empires.js
@@ -1,4 +1,7 @@
 const express = require("express");
+const Game = require("./game.js");
+
+const engine_name = "empires";
 
 const router = express.Router();
 
@@ -30,8 +33,9 @@ function shuffle(a) {
   }
 }
 
-class Game {
+class Empires extends Game {
   constructor() {
+    super(engine_name);
     this._spectators = [];
     this.next_spectator_id = 1;
     this._players = [];
@@ -387,5 +391,5 @@ router.get('/players', (request, response) => {
 router.get('/events', handle_events);
 
 exports.router = router;
-exports.name = "empires";
-exports.Game = Game;
+exports.name = engine_name;
+exports.Game = Empires;
diff --git a/game.js b/game.js
new file mode 100644
index 0000000..028c039
--- /dev/null
+++ b/game.js
@@ -0,0 +1,8 @@
+/* Base class providing common code for game engine implementations. */
+class Game {
+  constructor(name) {
+    this.name = name;
+  }
+}
+
+module.exports = Game;
diff --git a/tictactoe.js b/tictactoe.js
index a38cea0..5b8729e 100644
--- a/tictactoe.js
+++ b/tictactoe.js
@@ -1,9 +1,13 @@
 const express = require("express");
+const Game = require("./game.js");
+
+const engine_name = "tictactoe";
 
 const router = express.Router();
 
-class TicTacToe {
+class TicTacToe extends Game {
   constructor() {
+    super(engine_name);
     this.moves = [];
     this.board = Array(9).fill(null);
     this.clients = [];
@@ -100,5 +104,5 @@ router.get('/events', (request, response) => {
 });
 
 exports.router = router;
-exports.name = "tictactoe";
+exports.name = engine_name;
 exports.Game = TicTacToe;
-- 
2.43.0