Get the delve tour incrementer changes working and affecting fate as well

module/utils/fates.mjs

@@ -0,0 +1,51 @@
+import { gameTerms } from "../gameTerms.mjs";
+import { Logger } from "./Logger.mjs";
+
+const { FatePath } = gameTerms;
+
+export function isOppositeFates(a, b) {
+	return (a === FatePath.NORTH && b === FatePath.SOUTH)
+		|| (a === FatePath.EAST && b === FatePath.WEST);
+};
+
+export function distanceBetweenFates(start, end) {
+	if (!start || !end) {
+		Logger.error(`Start and End must both have a defined value, given`, {start, end});
+		return undefined;
+	};
+
+	if (start === end) {
+		return 0;
+	};
+
+	if (isOppositeFates(start, end) || isOppositeFates(end, start)) {
+		return 2;
+	};
+
+	let isForward = start === FatePath.SOUTH && end === FatePath.WEST;
+	isForward ||= start === FatePath.NORTH && end === FatePath.EAST;
+	isForward ||= start === FatePath.WEST && end === FatePath.NORTH;
+	isForward ||= start === FatePath.EAST && end === FatePath.SOUTH;
+	if (isForward) {
+		return 1;
+	};
+	return 3;
+};
+
+const fateOrder = [
+	FatePath.WEST, // to make the .find not integer overflow
+	FatePath.NORTH,
+	FatePath.EAST,
+	FatePath.SOUTH,
+	FatePath.WEST,
+];
+
+export function nextFate(fate) {
+	const fateIndex = fateOrder.findIndex(f => f === fate);
+	return fateOrder[fateIndex + 1];
+};
+
+export function previousFate(fate) {
+	const fateIndex = fateOrder.lastIndexOf(fate);
+	return fateOrder[fateIndex - 1];
+};