Add stock market tooltip info (#1189)

* Add info to stock market tooltips

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add up and down arrows to expected value

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Co-authored-by: srs42006 <45675882+srs42006@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/Disp/HelperFunctions/CalculateStockNextExpectedValue.js

@@ -0,0 +1,52 @@
+/**
+ * This function calculates a stock's next expected value
+ * @param	{number}	value		        The stock's current value
+ * @param	{number}	delta			    The stock's current delta
+ * @param	{number}	restingValue		The stock's resting value
+ * @param	{number}	mode		        The stock's current mode
+ * @param	{number}	bankLevel		    The bank building level
+ * @param	{number}	dragonBoost		    The current aura multiplier from Supreme Intellect and Reality Bending
+ * @returns	{number}	value + delta       The stock's next expected value
+ */
+export default function CalculateStockNextExpectedValue(
+  pValue,
+  pDelta,
+  restingValue,
+  mode,
+  bankLevel,
+  dragonBoost,
+) {
+  let value = pValue;
+  let delta = pDelta;
+  delta *= 0.97 + 0.01 * dragonBoost;
+  switch (mode) {
+    case 0:
+      delta *= 0.95;
+      break;
+    case 1:
+      delta *= 0.99;
+      delta += 0.02;
+      break;
+    case 2:
+      delta *= 0.99;
+      delta -= 0.02;
+      break;
+    case 3:
+      delta += 0.06;
+      value += 2.5;
+      break;
+    case 4:
+      delta -= 0.06;
+      value -= 2.5;
+      break;
+    default:
+      break;
+  }
+  value += (restingValue - value) * 0.01;
+  if (mode === 3) value -= 0.582;
+  if (mode === 4) value += 0.6;
+  if (value > 100 + (bankLevel - 1) * 3 && delta > 0) delta *= 0.9;
+  if (value < 5) value += (5 - value) * 0.5;
+  if (value < 5 && delta < 0) delta *= 0.95;
+  return Math.max(value + delta, 1);
+}