fix: commit all BC sync files missing from repo

src/services/businessCentral.ts

@@ -1,4 +1,5 @@
-const BC_PROXY_URL = '/api/bc-proxy';
+const BC_SYNC_PREVIEW_URL = '/api/bc-sync-preview';
+const BC_SYNC_APPLY_URL = '/api/bc-sync-apply';
 const BC_EXPORT_URL = '/api/bc-export';
 
 export interface BCUpdateResult {
@@ -6,12 +7,60 @@ export interface BCUpdateResult {
   error?: string;
 }
 
+export function isPreviewTokenMismatchError(error?: string): boolean {
+  return Boolean(error && error.toLowerCase().includes('preview token mismatch'));
+}
+
 export interface BCDownloadResult {
   success: boolean;
   error?: string;
   filename?: string;
 }
 
+export interface BCFieldChange {
+  sourceLabel: string;
+  sourceIndex: number | null;
+  targetField: string;
+  before: any;
+  after: any;
+  changed: boolean;
+}
+
+export interface BCSyncPreviewSection {
+  type: 'items' | 'itemUnitsOfMeasure';
+  desired: Record<string, any>;
+  current: Record<string, any> | null;
+  changes: BCFieldChange[];
+  changedFields: string[];
+  writeConfigured: boolean;
+  writeMethod: string | null;
+  writeUrlTemplate: string | null;
+  writeBodyTemplate: string | null;
+  canApply: boolean;
+}
+
+export interface BCSyncPreviewResult {
+  success: boolean;
+  articleNo: string;
+  items: BCSyncPreviewSection;
+  itemUnitsOfMeasure: BCSyncPreviewSection;
+  hasChanges: boolean;
+  previewToken: string;
+  error?: string;
+}
+
+export interface BCSyncApplyResult {
+  success: boolean;
+  articleNo: string;
+  previewToken?: string;
+  preview?: BCSyncPreviewResult;
+  results?: {
+    items: { applied: boolean; reason?: string; url?: string };
+    itemUnitsOfMeasure: { applied: boolean; reason?: string; url?: string };
+  };
+  error?: string;
+}
+
 async function readResponsePayload(res: Response): Promise<{ data: any; rawText: string }> {
   const rawText = await res.text();
   if (!rawText.trim()) {
@@ -27,7 +76,7 @@ async function readResponsePayload(res: Response): Promise<{ data: any; rawText:
 
 export async function updateCpnpNoInBC(articleNo: string, cpnpNo: string): Promise<BCUpdateResult> {
   try {
-    const res = await fetch(BC_PROXY_URL, {
+    const res = await fetch(BC_SYNC_APPLY_URL, {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({ articleNo, cpnpNo }),
@@ -48,6 +97,52 @@ export async function updateCpnpNoInBC(articleNo: string, cpnpNo: string): Promi
   }
 }
 
+export async function previewBusinessCentralSync(headers: string[], row: any[]): Promise<BCSyncPreviewResult> {
+  try {
+    const res = await fetch(BC_SYNC_PREVIEW_URL, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ headers, row }),
+    });
+
+    const { data, rawText } = await readResponsePayload(res);
+    if (!res.ok || !data?.success) {
+      const error =
+        data?.error ||
+        (typeof data === 'string' && data.trim()) ||
+        rawText ||
+        `HTTP ${res.status}`;
+      return { success: false, error } as BCSyncPreviewResult;
+    }
+    return data as BCSyncPreviewResult;
+  } catch (err: any) {
+    return { success: false, error: err.message } as BCSyncPreviewResult;
+  }
+}
+
+export async function applyBusinessCentralSync(headers: string[], row: any[], previewToken?: string): Promise<BCSyncApplyResult> {
+  try {
+    const res = await fetch(BC_SYNC_APPLY_URL, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ headers, row, previewToken }),
+    });
+
+    const { data, rawText } = await readResponsePayload(res);
+    if (!res.ok || !data?.success) {
+      const error =
+        data?.error ||
+        (typeof data === 'string' && data.trim()) ||
+        rawText ||
+        `HTTP ${res.status}`;
+      return { success: false, error } as BCSyncApplyResult;
+    }
+    return data as BCSyncApplyResult;
+  } catch (err: any) {
+    return { success: false, error: err.message } as BCSyncApplyResult;
+  }
+}
+
 function getFilenameFromDisposition(contentDisposition: string | null): string | null {
   if (!contentDisposition) return null;