From fba6ccb6692bf1d7753addc762e403a79fecb30e Mon Sep 17 00:00:00 2001
From: Mikita <mikit.sazan@gmail.com>
Date: Thu, 7 Nov 2024 23:46:09 +0300
Subject: [PATCH] feat: progression game

---
 bin/brain-progression.js     |  6 ++++++
 package.json                 |  3 ++-
 src/games/index.js           |  1 +
 src/games/progressionGame.js | 27 +++++++++++++++++++++++++++
 4 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100755 bin/brain-progression.js
 create mode 100644 src/games/progressionGame.js

diff --git a/bin/brain-progression.js b/bin/brain-progression.js
new file mode 100755
index 0000000..446e036
--- /dev/null
+++ b/bin/brain-progression.js
@@ -0,0 +1,6 @@
+#!/usr/bin/env node
+
+import brainGames from './brain-games.js';
+import { progressionGame } from '../src/games/index.js';
+
+brainGames.startGame(progressionGame, 'What number is missing in the progression?');
diff --git a/package.json b/package.json
index a51d8fd..deaaf97 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,8 @@
     "brain-games": "bin/brain-games.js",
     "brain-even": "bin/brain-even.js",
     "brain-calc": "bin/brain-calc.js",
-    "brain-gcd": "bin/brain-gcd.js"
+    "brain-gcd": "bin/brain-gcd.js",
+    "brain-progression": "bin/brain-progression.js"
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
diff --git a/src/games/index.js b/src/games/index.js
index 6146732..2bb54dc 100644
--- a/src/games/index.js
+++ b/src/games/index.js
@@ -1,3 +1,4 @@
 export { default as evenGame } from './evenGame.js';
 export { default as calcGame } from './calcGame.js';
 export { default as gcdGame } from './gcdGame.js';
+export { default as progressionGame } from './progressionGame.js';
diff --git a/src/games/progressionGame.js b/src/games/progressionGame.js
new file mode 100644
index 0000000..56ba3d4
--- /dev/null
+++ b/src/games/progressionGame.js
@@ -0,0 +1,27 @@
+import { askQuestion, getAnswer, getResponseAfterRound } from '../cli.js';
+
+export default () => {
+  const start = Math.round(Math.random() * 30);
+  const step = Math.round(Math.random() * 20);
+  const length = 10;
+
+  const progression = Array(length).fill(start).map((value, index) => start + index * step);
+  const targetIndex = Math.floor(Math.random() * length);
+  const copyProgression = [...progression];
+
+  copyProgression[targetIndex] = '..';
+
+  const questionText = copyProgression.join(' ');
+
+  askQuestion(questionText);
+
+  const userAnswer = getAnswer('Your answer: ');
+  const rightAnswer = progression[targetIndex];
+
+  const isUserRight = Number(userAnswer) === rightAnswer;
+  const resultString = getResponseAfterRound(isUserRight, userAnswer, rightAnswer);
+
+  console.log(resultString);
+
+  return isUserRight;
+};