Lauren Paik NgCola

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.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/balance/balance.service.ts

@@ -5,26 +5,29 @@ import { Observable } from 'rxjs/Observable';
 @Injectable()
 export class BalanceService {
   private balance: number = 0;
+  // subject is our observable
+  // kind of like an event queue-er
+  // .next puts another event in the queue
   private subject: Subject<number> = new Subject<number>();
 
   constructor() { }
-  
+
   private updateSubject(): void {
     this.subject.next(this.balance);
   }
 
-  setBalance(amount): void { 
-  	this.balance = amount; 
+  setBalance(amount): void {
+  	this.balance = amount;
   	this.updateSubject();
   }
-  
-  getBalance(): number { 
-  	return this.balance; 
+
+  getBalance(): number {
+  	return this.balance;
   }
-  
-  addBalance(amount): void { 
+
+  addBalance(amount): void {
   	this.balance += amount;
-  	this.updateSubject(); 
+  	this.updateSubject();
   }
 
   deductBalance(amount): void {

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

@@ -1,4 +1,6 @@
+<!-- currency is an angular type -->
 <p class="display -sm-width">{{ coinBalance? (coinBalance | currency:'USD':true): 'INSERT COIN' }}</p>
+<!-- on click, add cents to the total -->
 <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>

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

@@ -7,16 +7,20 @@ import { BalanceService } from '../balance/balance.service';
   styleUrls: ['./insert-coin.component.scss'],
   providers: []
 })
+
+// tells the class it needs to conform to OnInit
 export class InsertCoinComponent implements OnInit {
   coinBalance = 0;
   constructor(public balanceService: BalanceService) { }
 
+  // whenever a component uses this, the balance gets updated
   ngOnInit() {
   	this.balanceService.onBalanceUpdated((balance) => {
   	  this.coinBalance = balance;
   	});
   }
 
+  // this is what we invoke with the click handlers
   addBalance(amount) {
   	this.balanceService.addBalance(amount);
   }

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

@@ -0,0 +1,7 @@
+<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>
+<button (click)='onDispenseCan(item)'>Buy a Can!</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 +1,43 @@
+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;
+  public selectedItem;
+  constructor(public itemService: ItemService, public balanceService: BalanceService) { }
+
+  ngOnInit() {
+    this.itemService.onItemsRetrieved((items) =>  {
+      this.items = items;
+    })
+  }
+
+  onItemSelected(item) {
+    this.itemService.setSelectedItem(item);
+  }
+
+  onDispenseCan(item) {
+    let balance = this.balanceService.getBalance()
+    let can = this.itemService.getSelectedItem()
+    if (!this.itemService.hasRemaining()){
+      alert('no more cans!');
+    }
+    else if (this.itemService.hasSufficientBalance(balance)) {
+      this.itemService.dispenseItem(() => {
+        this.balanceService.deductBalance(can.cost)
+        const remainingBalance = this.balanceService.getBalance()
+        alert('here is your change: ' + remainingBalance)
+        this.balanceService.setBalance(0)
+      });
+    }
+    else {
+      alert('not enough funds');
+    };
+  }
+}