Implement component to retrieve

db.json

@@ -4,25 +4,25 @@
       "id": 1,
       "name": "Sprite",
       "cost": 0.5,
-      "remaining": 10
+      "remaining": 6
     },
     {
       "id": 2,
       "name": "Coke",
       "cost": 0.5,
-      "remaining": 10
+      "remaining": -7
     },
     {
       "id": 3,
       "name": "Dr. Pepper",
       "cost": 0.75,
-      "remaining": 10
+      "remaining": -22
     },
     {
       "id": 4,
       "name": "Mr Pibbs",
       "cost": 0.5,
-      "remaining": 10
+      "remaining": 8
     }
   ]
 }

src/app/app.component.html

@@ -2,3 +2,4 @@ <h1>
   {{title}}
 </h1>
 <app-insert-coin></app-insert-coin>
+<app-select-item></app-select-item>

src/app/app.component.ts

@@ -1,5 +1,4 @@
 import { Component } from '@angular/core';
-
 @Component({
   selector: 'app-root',
   templateUrl: './app.component.html',

src/app/app.module.ts

@@ -8,11 +8,13 @@ import { InsertCoinComponent } from './insert-coin/insert-coin.component';
 
 import { ItemService } from './item/item.service';
 import { BalanceService } from './balance/balance.service';
+import { SelectItemComponent } from './select-item/select-item.component';
 
 @NgModule({
   declarations: [
     AppComponent,
-    InsertCoinComponent
+    InsertCoinComponent,
+    SelectItemComponent
   ],
   imports: [
     BrowserModule,

src/app/insert-coin/insert-coin.component.html

@@ -2,3 +2,5 @@
 <button class="button -yellow" (click)='addBalance(.05)'>05c</button>
 <button class="button -blue" (click)='addBalance(.10)'>10c</button>
 <button class="button -green" (click)='addBalance(.25)'>25c</button>
+
+<button class="button" (click)='returnCoins()'>Return Coins</button>

src/app/insert-coin/insert-coin.component.ts

@@ -21,4 +21,9 @@ export class InsertCoinComponent implements OnInit {
   	this.balanceService.addBalance(amount);
   }
 
+  returnCoins() {
+    this.balanceService.setBalance(0);
+    alert('Coins returned!')
+  }
+
 }

src/app/select-item/select-item.component.html

@@ -0,0 +1,12 @@
+<p>
+  select-item works!
+</p>
+<ul>
+  <li *ngFor='let item of items'>
+    <input type = 'radio'[value]='item.id'
+    name = 'items-list' (change)='onItemSelected(item)'>{{item.name}}
+    {{item.cost}}
+    {{item.remaining}}
+  </li>
+</ul>
+<button (click)= 'itemDispense(item)'>Dispense</button>

src/app/select-item/select-item.component.spec.ts

@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { SelectItemComponent } from './select-item.component';
+
+describe('SelectItemComponent', () => {
+  let component: SelectItemComponent;
+  let fixture: ComponentFixture<SelectItemComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ SelectItemComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(SelectItemComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/select-item/select-item.component.ts

@@ -0,0 +1,45 @@
+import { Component, OnInit } from '@angular/core';
+import { ItemService } from '../item/item.service';
+import { BalanceService } from '../balance/balance.service';
+
+@Component({
+  selector: 'app-select-item',
+  templateUrl: './select-item.component.html',
+  styleUrls: ['./select-item.component.css']
+})
+export class SelectItemComponent implements OnInit {
+  public items;
+  constructor(public itemService: ItemService, public balanceService: BalanceService) { }
+
+  ngOnInit() {
+    this.itemService.onItemsRetrieved((items) => {
+      this.items = items;
+   })
+  }
+
+  onItemSelected(item) {
+    this.itemService.setSelectedItem(item);
+  }
+
+  itemDispense() {
+    const currentBalance = this.balanceService.getBalance();
+  	if(!this.hasSufficientBalance(currentBalance)) return;
+  	if(!this.hasRemaining()) return;
+  	this.itemService.dispenseItem((item) => {
+	  alert('Enjoy your ' + item.name);
+	  this.balanceService.deductBalance(item.cost);
+  	});
+  }
+
+  hasSufficientBalance(currentBalance) {
+  	const hasBalance = this.itemService.hasSufficientBalance(currentBalance);
+  	if(!hasBalance) alert('Insufficient balance');
+  	return hasBalance;
+  }
+
+  hasRemaining() {
+  	const remaining = this.itemService.hasRemaining();
+  	if(!remaining) alert('No remaining inventory for this item');
+  	return remaining;
+  }
+}