import {Injectable} from '@angular/core';
import { BarcodeScanner } from '@ionic-native/barcode-scanner';
import * as qrcode from 'qrcode-generator';
import { CartsProvider } from '../../services';
import { Cart, CartItem } from '../../classes';




// @Component({
//   selector: 'qqrcode',
//   providers: [ProductProvider, CartsProvider],
//   template: ''
// })
@Injectable()
export class QRProvider {
  // productProvider: ProductProvider;
  //   cartProvider: CartsProvider;
  qrIMage: string;
  constructor(private barcodeScanner: BarcodeScanner  ) { }

  createQRCode(data: string) {
    try {
      let qr: any;
      qr =  qrcode(5, 'M');

      qr.addData(data);
      qr.make();
      return   qr.createImgTag(4 , 2);

    }catch (e) {
      console.error( 'Error generating QR Code:' + e.message);
    }
  }


  ScanCart(userId: string,  cartsProvider: CartsProvider) {
    let data: string;
    this.barcodeScanner.scan()
      .then((result) => {
        if (!result.cancelled) {
      	    // const barcodeData = new BarcodeData(result.text, result.format);
            data = result.text;
            this.parseQRCode(data, userId, cartsProvider);
            console.log(data);
          }
        })
     .catch((err) => {
       alert(err);
     });
  }
  parseQRCode (scannedData: string, userId: string,  cartsProvider: CartsProvider) {

     // split by ?, first element is the storeID and every other elemtn is a product in cart
     const qrCodeValues = scannedData.split('?');
    // retrieve cartId
     let cartId = qrCodeValues[0];

     // retrieve said cart
     cartsProvider.retrieve(cartId).then(
       (cartToPass: Cart) => {
         cartsProvider.retrieveAllCarts().then( (response) => {

         // retrieve array of carts for user !!!! should return single not array
         cartsProvider.retrieveByUserAndStore(cartToPass.tenantId, cartToPass.storeId, userId).then(
           (cartsOfUser: Cart[]) => {
            cartsOfUser = cartsOfUser.filter((cart: Cart) => { return cart.status === 'open'; });
              // if exists add
              if (cartsOfUser.length > 0 ) {
                  this.passCartItems(cartToPass, cartsOfUser[0], cartsProvider);

              // else create and then add
              }else {
                cartsProvider.create(cartToPass.tenantId, cartToPass.getStoreId(), userId).then(
                  (destiNationCart: Cart) => {
                    this.passCartItems(cartToPass, destiNationCart, cartsProvider);
                  }
                );
              }
           }
         );
       }
     );
  });
  }

  passCartItems(source: Cart, destination: Cart, cartsProvider: CartsProvider) {
    source.getCartItems().forEach( (cItem: CartItem) => {
      cartsProvider.addItem(destination.id , cItem);
    });

  }

}