feat: added features, refactored code, updated readme

game.ts

@@ -1,6 +1,7 @@
 // Game logic for morse code practice
 
 import { textToMorse, compareMorse, normalizeMorse } from "./morse.ts";
+import wordsArray from "an-array-of-english-words" with { type: "json" };
 
 export type GameMode =
   | "letters"
@@ -38,45 +39,34 @@ const NUMBERS = "0123456789".split("");
 const PUNCTUATION = ".,?!-/()@".split("");
 const ALPHANUMERIC = [...LETTERS, ...NUMBERS];
 const FULL_SET = [...LETTERS, ...NUMBERS, ...PUNCTUATION];
-const WORDS = [
-  "HELLO",
-  "WORLD",
-  "CODE",
-  "TIME",
-  "GAME",
-  "TEST",
-  "PLAY",
-  "FAST",
-  "SLOW",
-  "HELP",
-  "GOOD",
-  "BEST",
-  "NICE",
-  "COOL",
-  "MORSE",
-  "SIGNAL",
-  "RADIO",
-  "SEND",
-  "MESSAGE",
-  "QUICK",
-  "LEARN",
-  "PRACTICE",
-  "SKILL",
-  "MASTER",
-  "EXPERT",
-];
-const PHRASES = [
-  "HELLO WORLD",
-  "GOOD MORNING",
-  "HOW ARE YOU",
-  "THANK YOU",
-  "SEE YOU SOON",
-  "HAVE A NICE DAY",
-  "MORSE CODE",
-  "QUICK BROWN FOX",
-  "THE END",
-  "WELL DONE",
-];
+
+// Filter words for morse code practice (3-8 letters, common words)
+const ALL_WORDS = wordsArray
+  .filter((word: string) => {
+    const upper = word.toUpperCase();
+    return (
+      word.length >= 3 && word.length <= 8 && /^[A-Z]+$/.test(upper) // Only letters, no special chars
+    );
+  })
+  .map((word: string) => word.toUpperCase());
+
+// Randomly select a subset for variety
+const WORDS = ALL_WORDS.sort(() => Math.random() - 0.5).slice(0, 500);
+
+/**
+ * Generate a random phrase from word combinations
+ */
+function generatePhrase(): string {
+  const phraseLength = Math.floor(Math.random() * 3) + 2; // 2-4 words
+  const selectedWords: string[] = [];
+
+  for (let i = 0; i < phraseLength; i++) {
+    const word = WORDS[Math.floor(Math.random() * WORDS.length)];
+    selectedWords.push(word);
+  }
+
+  return selectedWords.join(" ");
+}
 
 /**
  * Get a random challenge based on game mode
@@ -92,7 +82,7 @@ export function getChallenge(mode: GameMode): string {
     case "words":
       return WORDS[Math.floor(Math.random() * WORDS.length)];
     case "phrases":
-      return PHRASES[Math.floor(Math.random() * PHRASES.length)];
+      return generatePhrase();
   }
 }