Feature: Tax Regimes are added so that different bills with different series can be printed for Different regimes such as VAT and GST

Chore: Model relationships updated to make them simpler
Chore: Bill printing majorly refactored for it

Due to the sheer depth of the changes. There can be showstoppers. Please test it carefully

bookie/src/app/settings/settings.component.ts

@@ -1,7 +1,8 @@
 import { Component, OnInit } from '@angular/core';
-import { UntypedFormBuilder, UntypedFormGroup } from '@angular/forms';
+import { FormControl, FormGroup } from '@angular/forms';
 import { MatDialog } from '@angular/material/dialog';
 import { ActivatedRoute, Router } from '@angular/router';
+import * as moment from 'moment';
 
 import { environment } from '../../environments/environment';
 import { AuthService } from '../auth/auth.service';
@@ -16,19 +17,28 @@ import { SettingsService } from './settings.service';
 })
 export class SettingsComponent implements OnInit {
   prefillCustomerDiscount = true;
-
   version: string;
+  maintenanceForm: FormGroup<{
+    startDate: FormControl<Date>;
+    finishDate: FormControl<Date>;
+  }>;
+
+  beerFile: File | null = null;
+  saleFile: File | null = null;
 
   constructor(
     private route: ActivatedRoute,
     private router: Router,
-    private fb: UntypedFormBuilder,
     private dialog: MatDialog,
     private toaster: ToasterService,
     public auth: AuthService,
     private ser: SettingsService,
   ) {
     this.version = environment.version;
+    this.maintenanceForm = new FormGroup({
+      startDate: new FormControl(new Date(), { nonNullable: true }),
+      finishDate: new FormControl(new Date(), { nonNullable: true }),
+    });
   }
 
   ngOnInit() {
@@ -46,4 +56,31 @@ export class SettingsComponent implements OnInit {
       this.prefillCustomerDiscount = x;
     });
   }
+
+  detectBeer(event: Event) {
+    this.beerFile = ((event.target as HTMLInputElement).files as FileList)[0];
+  }
+
+  detectSale(event: Event) {
+    this.saleFile = ((event.target as HTMLInputElement).files as FileList)[0];
+  }
+
+  runMaintenance() {
+    const formModel = this.maintenanceForm.value;
+    const startDate = moment(formModel.startDate).format('DD-MMM-YYYY');
+    const finishDate = moment(formModel.finishDate).format('DD-MMM-YYYY');
+
+    if (!this.beerFile || !this.saleFile) {
+      this.toaster.show('Danger', 'Please choose both files first!');
+      return;
+    }
+    this.ser.runMaintenance(startDate, finishDate, this.beerFile, this.saleFile).subscribe(
+      () => {
+        this.toaster.show('Success', 'Maintenance done');
+      },
+      (error) => {
+        this.toaster.show('Danger', error);
+      },
+    );
+  }
 }

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

@@ -26,4 +26,20 @@ export class SettingsService {
       catchError(this.log.handleError(serviceName, 'setPrefillCustomerDiscount')),
     ) as Observable<boolean>;
   }
+
+  runMaintenance(
+    startDate: string,
+    finishDate: string,
+    beerFile: File,
+    saleFile: File,
+  ): Observable<boolean> {
+    const options = { params: new HttpParams().set('s', startDate).set('f', finishDate) };
+    const url = '/api/maintenance';
+    const fd = new FormData();
+    fd.append('beer_file', beerFile);
+    fd.append('sale_file', saleFile);
+    return this.http
+      .post<boolean>(url, fd, options)
+      .pipe(catchError(this.log.handleError(serviceName, 'runMaintenance'))) as Observable<boolean>;
+  }
 }