Initial commit

app/Services/BusyWindowService.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\ExternalBusyWindow;
+use Carbon\Carbon;
+
+class BusyWindowService
+{
+    public static function getBusyRanges()
+    {
+        // Fetch current + upcoming busy windows
+        return ExternalBusyWindow::where('ends_at', '>=', now())
+            ->get()
+            ->map(fn($w) => [
+                'start' => Carbon::parse($w->starts_at)->subMinutes(40),
+                'end'   => Carbon::parse($w->ends_at)->addMinutes(40),
+            ]);
+    }
+
+	public static function isInBusyWindow($slotStart, $busyRanges, $slotLengthMinutes = 60)
+	{
+		$slotEnd = (clone $slotStart)->addMinutes($slotLengthMinutes);
+
+		foreach ($busyRanges as $range) {
+			// If the slot overlaps the busy window in any way
+			if ($slotStart < $range['end'] && $slotEnd > $range['start']) {
+				return true;
+			}
+		}
+		return false;
+	}
+}