Feature: Added the customer module to list / edit customers. This is needed to add the customer discount functionality

bookie/src/app/customers/customer-detail/customer-detail.component.css

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+.example-card {
+  max-width: 400px;
+}

bookie/src/app/customers/customer-detail/customer-detail.component.html

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+<div fxLayout="row" fxFlex="50%" fxLayoutAlign="space-around center" class="example-card">
+  <mat-card fxFlex>
+    <mat-card-title-group>
+      <mat-card-title>Customer</mat-card-title>
+    </mat-card-title-group>
+    <mat-card-content>
+      <form [formGroup]="form" fxLayout="column">
+        <div
+          fxLayout="row"
+          fxLayoutAlign="space-around start"
+          fxLayout.lt-md="column"
+          fxLayoutGap="20px"
+          fxLayoutGap.lt-md="0px"
+        >
+          <mat-form-field fxFlex>
+            <mat-label>Name</mat-label>
+            <input matInput #nameElement placeholder="Name" formControlName="name" />
+          </mat-form-field>
+        </div>
+        <div
+          fxLayout="row"
+          fxLayoutAlign="space-around start"
+          fxLayout.lt-md="column"
+          fxLayoutGap="20px"
+          fxLayoutGap.lt-md="0px"
+        >
+          <mat-form-field fxFlex>
+            <mat-label>Phone</mat-label>
+            <input matInput placeholder="Phone" formControlName="phone" />
+          </mat-form-field>
+        </div>
+        <div
+          fxLayout="row"
+          fxLayoutAlign="space-around start"
+          fxLayout.lt-md="column"
+          fxLayoutGap="20px"
+          fxLayoutGap.lt-md="0px"
+        >
+          <mat-form-field fxFlex>
+            <mat-label>Address</mat-label>
+            <input matInput placeholder="Address" formControlName="address" />
+          </mat-form-field>
+        </div>
+      </form>
+    </mat-card-content>
+    <mat-card-actions>
+      <button mat-raised-button color="primary" (click)="save()">Save</button>
+      <button mat-raised-button color="warn" (click)="confirmDelete()">Delete</button>
+    </mat-card-actions>
+  </mat-card>
+</div>

bookie/src/app/customers/customer-detail/customer-detail.component.spec.ts

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+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
+
+import { CustomerDetailComponent } from './customer-detail.component';
+
+describe('CustomerDetailComponent', () => {
+  let component: CustomerDetailComponent;
+  let fixture: ComponentFixture<CustomerDetailComponent>;
+
+  beforeEach(
+    waitForAsync(() => {
+      TestBed.configureTestingModule({
+        declarations: [CustomerDetailComponent],
+      }).compileComponents();
+    }),
+  );
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(CustomerDetailComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

bookie/src/app/customers/customer-detail/customer-detail.component.ts

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+import { AfterViewInit, Component, ElementRef, OnInit, ViewChild } from '@angular/core';
+import { AbstractControl, FormArray, FormBuilder, FormGroup } from '@angular/forms';
+import { MatDialog } from '@angular/material/dialog';
+import { ActivatedRoute, Router } from '@angular/router';
+
+import { Customer } from '../../core/customer';
+import { ToasterService } from '../../core/toaster.service';
+import { ConfirmDialogComponent } from '../../shared/confirm-dialog/confirm-dialog.component';
+import { CustomerService } from '../customer.service';
+
+@Component({
+  selector: 'app-customer-detail',
+  templateUrl: './customer-detail.component.html',
+  styleUrls: ['./customer-detail.component.css'],
+})
+export class CustomerDetailComponent implements OnInit, AfterViewInit {
+  @ViewChild('nameElement', { static: true }) nameElement?: ElementRef;
+  form: FormGroup;
+  item: Customer = new Customer();
+  hide: boolean;
+
+  constructor(
+    private route: ActivatedRoute,
+    private router: Router,
+    private fb: FormBuilder,
+    private toaster: ToasterService,
+    private dialog: MatDialog,
+    private ser: CustomerService,
+  ) {
+    this.hide = true;
+    // Create form
+    this.form = this.fb.group({
+      name: '',
+      phone: '',
+      address: '',
+    });
+  }
+
+  ngOnInit() {
+    this.route.data.subscribe((value) => {
+      const data = value as { item: Customer };
+      this.showItem(data.item);
+    });
+  }
+
+  showItem(item: Customer) {
+    this.item = item;
+    (this.form.get('name') as AbstractControl).setValue(item.name);
+    (this.form.get('phone') as AbstractControl).setValue(item.phone);
+    (this.form.get('address') as AbstractControl).setValue(item.address);
+  }
+
+  ngAfterViewInit() {
+    setTimeout(() => {
+      if (this.nameElement !== undefined) {
+        this.nameElement.nativeElement.focus();
+      }
+    }, 0);
+  }
+
+  save() {
+    this.ser.saveOrUpdate(this.getItem()).subscribe(
+      () => {
+        this.toaster.show('Success', '');
+        this.router.navigateByUrl('/customers');
+      },
+      (error) => {
+        this.toaster.show('Error', error);
+      },
+    );
+  }
+
+  delete() {
+    this.ser.delete(this.item.id as string).subscribe(
+      () => {
+        this.toaster.show('Success', '');
+        this.router.navigateByUrl('/customers');
+      },
+      (error) => {
+        this.toaster.show('Error', error);
+      },
+    );
+  }
+
+  confirmDelete(): void {
+    const dialogRef = this.dialog.open(ConfirmDialogComponent, {
+      width: '250px',
+      data: { title: 'Delete Customer?', content: 'Are you sure? This cannot be undone.' },
+    });
+
+    dialogRef.afterClosed().subscribe((result: boolean) => {
+      if (result) {
+        this.delete();
+      }
+    });
+  }
+
+  getItem(): Customer {
+    const formModel = this.form.value;
+    this.item.name = formModel.name;
+    this.item.phone = formModel.phone;
+    this.item.address = formModel.address;
+    return this.item;
+  }
+}