1 files changed, 47 insertions, 0 deletions
diff --git a/sdnr/wt/odlux/apps/helpApp/src/services/helpService.ts b/sdnr/wt/odlux/apps/helpApp/src/services/helpService.ts
new file mode 100644
index 000000000..480cdd04e
--- /dev/null
+++ b/sdnr/wt/odlux/apps/helpApp/src/services/helpService.ts
@@ -0,0 +1,47 @@
+import { requestRest } from '../../../../framework/src/services/restService';
+import { TocTreeNode, TocNodeCollection } from '../models/tocNode';
+
+class HelpService {
+
+  private tocNodeCollection: TocTreeNode[] | null = null;
+  private documents: { [path: string]: string | null } = {};
+
+  public async getDocument(path: string): Promise<string | null> {
+    // check if the result is allready in the cache
+    if (this.documents[path]) return Promise.resolve(this.documents[path]);
+    
+    // request the document
+    const result = await requestRest<string>(`/help/${ path }`.replace(/\/{2,}/i, '/'));
+    if (result) {
+      this.documents[path] = result;
+    }
+    return this.documents[path] || null;
+  }
+
+  public async getTableOfContents(): Promise<TocTreeNode[] | null> {
+    // check if the result is allready in the cache
+    if (this.tocNodeCollection) return Promise.resolve(this.tocNodeCollection);
+
+    // request the table of contents
+    const result = await requestRest<TocNodeCollection>('/help/?meta');
+    if (result !== false) {
+      const mapNodesCollection = (col: TocNodeCollection): TocTreeNode[] => {
+        return Object.keys(col).reduce <TocTreeNode[]>((acc, key) => {
+          const current = col[key];
+          acc.push({
+            label: current.label,
+            uri: current.versions.current.path,
+            nodes: current.nodes && mapNodesCollection(current.nodes) || undefined
+          });
+          return acc;
+        }, []);
+      }
+
+      this.tocNodeCollection = result && mapNodesCollection(result);
+    }
+    return this.tocNodeCollection  || null;
+  }
+}
+
+export const helpService = new HelpService();
+export default helpService;
+\ No newline at end of file