Add initial departure board table 'skeleton', very basic at present

src/lib/utils/time.ts

@@ -1,4 +1,7 @@
 import type { ApiTrainsTrainDetails } from '@owlboard/owlboard-ts';
+
+export const estClass = (act: any, est: any) => (!act && est ? 'est' : 'act');
+
 /**
  * Converts ISO/JSON time to UK-formatted HH:MM string, with optional (default off) seconds
  * Ensures Europe/London timezone irrespective of browser timezone.
@@ -49,21 +52,40 @@ export function formatUkDateTime(
 		.replace(',', '');
 }
 
+/**
+ * Specific type that can handle the TrainDetails.ServiceLocation and the ApiStationsBoard.BoardService types for delay calculation
+ */
+interface DelayInput {
+    // Board types
+    sta?: string | null; std?: string | null; 
+    eta?: string | null; etd?: string | null;
+    ata?: string | null; atd?: string | null;
+    
+    // Journey types
+    pta?: string | null; ptd?: string | null; 
+    wta?: string | null; wtd?: string | null;
+    atp?: string | null; wtp?: string | null;
+	etp?: string | null;
+}
+
 /**
  * Calculates a 'delay' value, in the formats:
  * RT, 1E, 7L, etc.
- * @param 'Schedule Location' object
+ * @param 'Schedule Location' or 'Board Service' object
  * @returns Delay string for departure boards
  */
-export function calculateDelay(loc: ApiTrainsTrainDetails.ServiceLocation): {
+export function calculateDelay(loc: DelayInput): {
 	val: string;
 	type: string;
 } {
 	const pairs = [
-		{ actual: loc.atd, sched: loc.ptd ?? loc.wtd },
-		{ actual: loc.ata, sched: loc.pta ?? loc.wta },
-		{ actual: loc.atp, sched: loc.wtp }
-	];
+        // Departure check (Board: atd/etd vs std | Journey: atd vs ptd/wtd)
+        { actual: loc.atd || loc.etd, sched: loc.std || loc.ptd || loc.wtd },
+        // Arrival check (Board: ata/eta vs sta | Journey: ata vs pta/wta)
+        { actual: loc.ata || loc.eta, sched: loc.sta || loc.pta || loc.wta },
+        // Passing check
+        { actual: loc.atp || loc.etp, sched: loc.wtp }
+    ];
 
 	const match = pairs.find((p) => p.actual && p.sched);