Feature: Open bill using bill number

bookie/src/app/sales/bill-number/bill-number.component.ts

@@ -0,0 +1,54 @@
+import { Component, Inject, OnInit } from '@angular/core';
+import { FormBuilder, FormGroup } from '@angular/forms';
+import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
+
+@Component({
+  selector: 'app-bill-number',
+  templateUrl: './bill-number.component.html',
+  styleUrls: ['./bill-number.component.css'],
+})
+export class BillNumberComponent implements OnInit {
+  form: FormGroup;
+
+  constructor(public dialogRef: MatDialogRef<BillNumberComponent>, private fb: FormBuilder) {
+    // Create form
+    this.form = this.fb.group({
+      billType: '',
+      billNumber: '',
+    });
+  }
+
+  ngOnInit() {
+    this.form.setValue({
+      billType: '1',
+      billNumber: '',
+    });
+  }
+
+  accept(): void {
+    const formValue = this.form.value;
+    const billNumber = parseInt(formValue.billNumber.replace('-', ''), 10);
+    if (isNaN(billNumber)) {
+      this.dialogRef.close(undefined);
+    } else {
+      let billId: string;
+      switch (formValue.billType) {
+        case '0': // KOT
+          billId = 'K-' + billNumber;
+          break;
+        case '1': // Regular Bill
+          billId = Math.floor(billNumber / 10000) + '-' + (billNumber % 10000);
+          break;
+        case '4': // Staff
+          billId = 'ST-' + billNumber;
+          break;
+        case '2': // No Charge
+          billId = 'NC-' + billNumber;
+          break;
+        default:
+          throw new Error('Unknown Bill Type');
+      }
+      this.dialogRef.close(billId);
+    }
+  }
+}