Create scramble generator

apps/cubescramble/cube-scramble.js

@@ -1,7 +1,66 @@
-g.clear();
 
-function appStart() {
-  E.showMessage("Loading...");
-}
+// Scramble code from: https://raw.githubusercontent.com/bjcarlson42/blog-post-sample-code/master/Rubik's%20Cube%20JavaScript%20Scrambler/part_two.js
+const makeScramble = () => {
+  const options = ["F", "F2", "F'", "R", "R2", "R'", "U", "U2", "U'", "B", "B2", "B'", "L", "L2", "L'", "D", "D2", "D'"];
+  const numOptions = [0, 1, 2, 3, 4, 5]; // 0 = F, 1 = R, 2 = U, 3 = B, 4 = L, 5 = D
+  const scrambleMoves = [];
+  let bad = true;
 
-appStart();
+  while (bad) {
+      let scramble = [];
+      for (let i = 0; i < 20; i++) {
+          scramble.push(numOptions[getRandomInt(6)]);
+      }
+      // check if moves directly next to each other involve the same letter
+      for (let i = 0; i < 20 - 1; i++) {
+          if (scramble[i] == scramble[i + 1]) {
+              bad = true;
+              break;
+          } else {
+              bad = false;
+          }
+      }
+  }
+  // switch numbers to letters
+  let move;
+  for (let i = 0; i < 20; i++) {
+      switch (scramble[i]) {
+          case 0:
+              move = options[getRandomInt(3)]; // 0,1,2
+              scrambleMoves.push(move);
+              break;
+          case 1:
+              move = options[getRandomIntBetween(3, 6)]; // 3,4,5
+              scrambleMoves.push(move);
+              break;
+          case 2:
+              move = options[getRandomIntBetween(6, 9)]; // 6,7,8
+              scrambleMoves.push(move);
+              break;
+          case 3:
+              move = options[getRandomIntBetween(9, 12)]; // 9,10,11
+              scrambleMoves.push(move);
+              break;
+          case 4:
+              move = options[getRandomIntBetween(12, 15)]; // 12,13,14
+              scrambleMoves.push(move);
+              break;
+          case 5:
+              move = options[getRandomIntBetween(15, 18)]; // 15,16,17
+              scrambleMoves.push(move);
+              break;
+      }
+  }
+  return scrambleMoves;
+};
+
+const getRandomInt = max => Math.floor(Math.random() * Math.floor(max)); // returns up to max - 1
+
+const getRandomIntBetween = (min, max) => Math.floor(Math.random() * (max - min) + min);
+
+const presentScramble = () => {
+  g.clear();
+  E.showMessage(makeScramble().join(" "));
+};
+
+presentScramble();