<ion-item *ngFor="let stock of stocks | async" class="item item-trns text-center"
    (click)="showOptions(stock, stock.$key)">
      <strong><h2>{{ stock.name }}</h2></strong>
      <p>Date added: {{stock.date}}</p>
      <p>Quantity in stock: {{stock.actualq-stock.sold}}</p>
      <p>Sold: {{stock.sold}}</p>

showOptions(stock, stock.$key)

Quantity in stock: {{stock.actualq-stock.sold}}

addSale(id,saledate,salequantity,buyingprice,sellingprice,sale,profit,saletotal) {
    if(id) {
      this.stocks.update(id, {
        saledate: saledate,
        salequantity: salequantity,
        buyingprice: buyingprice,
        sellingprice: sellingprice,
        sale: true,
        profit: (sellingprice-buyingprice)*salequantity,
        saletotal: (salequantity*sellingprice),

      }).then( newSale => {
            this.toast.show('Data updated', '5000', 'center').subscribe(
              toast => {
                this.navCtrl.pop();
              }
            );
          })
          .catch(e => {
            console.log(e);
            this.toast.show(e, '5000', 'center').subscribe(
              toast => {
                console.log(toast);
              }
            );
          });

addSale(id,saledate,salequantity,buyingprice,sellingprice,sale,profit,saletotal) {
    if(id) {
        this.db.object('stocks/'+id).snapshotChanges().subscribe(action => {
           console.log(action.payload.val());
           let stockInHand = action.payload.val().actualq-action.payload.val().sold;
           //check if salequantity is lessthan or equal to stockInHand
           if(salequantity <= stockInHand){
               //perform update
           }else{
               //toast no stock available
           }
        });
    }
}