Merge pull request #10 from ilbertt/fix-merch-prizes-randomness

fix merch prizes randomness

src/fortune-wheel-booth-frontend/src/utils/findPrize.ts

@@ -1,6 +1,22 @@
 import { PRIZES } from '../costants';
 
+const getMerchPrizesIndexes = () => {
+  const merchPrizes: number[] = PRIZES.reduce((acc: number[], prize, index) => {
+    if (prize?.option?.includes('merch')) {
+      acc.push(index);
+    }
+    return acc;
+  }, []);
+
+  return merchPrizes;
+};
+
 export const findPrize = (option: string) => {
-  const prize = PRIZES.find((prize, index) => prize.option === option);
-  return prize ? PRIZES.indexOf(prize) : 99; // TODO: Fix this, 99 represents "no prize exists for this option"
+  if (option === 'merch') {
+    const merchPrizesIndexes: number[] = getMerchPrizesIndexes();
+    return merchPrizesIndexes[
+      Math.floor(Math.random() * merchPrizesIndexes.length)
+    ];
+  }
+  return PRIZES.findIndex((prize) => prize.option === option); // Returns the index of the first element in the array where predicate is true, and -1 otherwise.
 };