improvement: duedate added for shipped cases. cases and tasks ui and ux updated accordingly.

backend/src/common/lab-case-due-date.ts

@@ -0,0 +1,42 @@
+import { LabTaskStatus } from '@prisma/client';
+
+/** Parse YYYY-MM-DD (or ISO) into UTC midnight for that calendar day. */
+export function parseDueDateInput(value?: string | null): Date | null {
+  if (value === undefined || value === null || value === '') {
+    return null;
+  }
+  const trimmed = value.trim();
+  if (!trimmed) return null;
+
+  const dateOnly = /^\d{4}-\d{2}-\d{2}$/.test(trimmed);
+  const parsed = dateOnly ? new Date(`${trimmed}T00:00:00.000Z`) : new Date(trimmed);
+  if (Number.isNaN(parsed.getTime())) {
+    throw new Error('Invalid due date');
+  }
+  if (dateOnly) {
+    return parsed;
+  }
+  const normalized = new Date(parsed);
+  normalized.setUTCHours(0, 0, 0, 0);
+  return normalized;
+}
+
+export function startOfUtcDay(date = new Date()): Date {
+  const d = new Date(date);
+  d.setUTCHours(0, 0, 0, 0);
+  return d;
+}
+
+export function isLabCaseOverdue(
+  dueDate: Date | null | undefined,
+  tasks: Array<{ status: LabTaskStatus }>,
+): boolean {
+  if (!dueDate) return false;
+  const hasInProgress = tasks.some((task) => task.status === LabTaskStatus.IN_PROGRESS);
+  if (!hasInProgress) return false;
+  return dueDate < startOfUtcDay();
+}
+
+export function isLabCaseFullyCompleted(tasks: Array<{ status: LabTaskStatus }>): boolean {
+  return tasks.length > 0 && tasks.every((task) => task.status === LabTaskStatus.COMPLETED);
+}