feat: add data generation logic and history file class

backend/utils/random.js

@@ -0,0 +1,33 @@
+/**
+ * Generates a random integer between min and max (inclusive)
+ * @param {number} min
+ * @param {number} max
+ * @returns {number}
+ */
+export function randomInt(min, max) {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+/**
+ * Generates a random number based on previous number, and provided range
+ * Also taking into account global provided min and max values
+ * @param {number} previousNumber
+ * @param {number} range (0 - 1)
+ * @param {number} min
+ * @param {number} max
+ * @returns {number}
+ */
+export function randomInRange(previousNumber, range, min, max) {
+  // Decides on min max range for the next number
+  // based on range, and previous number
+  const integerRange = previousNumber * range; // +- 0.3 -> 30%
+  // Calculate min, and check if its less that global min (eg. 0)
+  let newMin = previousNumber - integerRange;
+  if (newMin < min) newMin = min; // sets to global min, for example 0
+
+  // calculate max, and check if number is above the global set max (eg. 100)
+  let newMax = previousNumber + integerRange;
+  if (newMax > max) newMax = max; // sets to global max, for example 100
+
+  return Math.floor(randomInt(newMin, newMax));
+}