FHIR, API, datamodel

lib/fhir/utils.ts

@@ -0,0 +1,93 @@
+/**
+ * FHIR Utilities
+ * Helper functions for working with FHIR resources
+ */
+
+import type { FHIRReference, FHIROperationOutcome } from './types';
+
+/**
+ * Extract resource ID from FHIR reference string
+ * Example: "Patient/123" -> "123"
+ */
+export function extractIdFromReference(reference?: string): string | null {
+  if (!reference) return null;
+  const parts = reference.split('/');
+  return parts.length === 2 ? parts[1] : null;
+}
+
+/**
+ * Create FHIR reference from resource type and ID
+ * Example: ("Patient", "123") -> "Patient/123"
+ */
+export function createReference(
+  resourceType: string,
+  id: string,
+  display?: string
+): FHIRReference {
+  return {
+    reference: `${resourceType}/${id}`,
+    type: resourceType,
+    display,
+  };
+}
+
+/**
+ * Create FHIR OperationOutcome for errors
+ */
+export function createOperationOutcome(
+  severity: 'fatal' | 'error' | 'warning' | 'information',
+  code: string,
+  diagnostics: string
+): FHIROperationOutcome {
+  return {
+    resourceType: 'OperationOutcome',
+    issue: [
+      {
+        severity,
+        code,
+        diagnostics,
+      },
+    ],
+  };
+}
+
+/**
+ * Validate FHIR resource has required fields
+ */
+export function validateFHIRResource(
+  resource: any,
+  requiredFields: string[]
+): { valid: boolean; errors: string[] } {
+  const errors: string[] = [];
+
+  for (const field of requiredFields) {
+    if (!resource[field]) {
+      errors.push(`Missing required field: ${field}`);
+    }
+  }
+
+  return {
+    valid: errors.length === 0,
+    errors,
+  };
+}
+
+/**
+ * Format date to FHIR date format (YYYY-MM-DD)
+ */
+export function toFHIRDate(date: Date | string): string {
+  if (typeof date === 'string') {
+    return date.split('T')[0];
+  }
+  return date.toISOString().split('T')[0];
+}
+
+/**
+ * Format datetime to FHIR datetime format (ISO 8601)
+ */
+export function toFHIRDateTime(date: Date | string): string {
+  if (typeof date === 'string') {
+    return date;
+  }
+  return date.toISOString();
+}