Customer discount with prefill discount in sales.

bookie/src/app/settings/settings.service.ts

@@ -0,0 +1,31 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs/internal/Observable';
+import { catchError, map } from 'rxjs/operators';
+
+import { ErrorLoggerService } from '../core/error-logger.service';
+
+const serviceName = 'SettingsService';
+
+@Injectable({ providedIn: 'root' })
+export class SettingsService {
+  constructor(private http: HttpClient, private log: ErrorLoggerService) {}
+
+  getPrefillCustomerDiscount(): Observable<boolean> {
+    const url = '/api/settings/prefill-customer-discount';
+    return this.http.get<{ value: boolean }>(url).pipe(
+      map((x) => x.value),
+      catchError(this.log.handleError(serviceName, 'getPrefillCustomerDiscount')),
+    ) as Observable<boolean>;
+  }
+
+  setPrefillCustomerDiscount(value: boolean): Observable<boolean> {
+    const url = '/api/settings/prefill-customer-discount';
+    return this.http
+      .post<{ value: boolean }>(url, { value: value })
+      .pipe(
+        map((x) => x.value),
+        catchError(this.log.handleError(serviceName, 'setPrefillCustomerDiscount')),
+      ) as Observable<boolean>;
+  }
+}