copay-crown/src/pages/integrations/amazon/buy-amazon/buy-amazon.ts

A Secure Crown Wallet

import { Component } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
import { Events, ModalController, NavController, NavParams } from 'ionic-angular';
import * as _ from 'lodash';
import * as moment from 'moment';
import { Logger } from '../../../../providers/logger/logger';

// Pages
import { FinishModalPage } from '../../../finish/finish';
import { FeeWarningPage } from '../../../send/fee-warning/fee-warning';
import { AmazonPage } from '../amazon';

// Provider
import { AmazonProvider } from '../../../../providers/amazon/amazon';
import { BwcErrorProvider } from '../../../../providers/bwc-error/bwc-error';
import { BwcProvider } from '../../../../providers/bwc/bwc';
import { ConfigProvider } from '../../../../providers/config/config';
import { EmailNotificationsProvider } from '../../../../providers/email-notifications/email-notifications';
import { ExternalLinkProvider } from '../../../../providers/external-link/external-link';
import { OnGoingProcessProvider } from "../../../../providers/on-going-process/on-going-process";
import { PopupProvider } from '../../../../providers/popup/popup';
import { ProfileProvider } from '../../../../providers/profile/profile';
import { TxFormatProvider } from '../../../../providers/tx-format/tx-format';
import { WalletProvider } from '../../../../providers/wallet/wallet';

@Component({
  selector: 'page-buy-amazon',
  templateUrl: 'buy-amazon.html',
})
export class BuyAmazonPage {

  private bitcoreCash: any;
  private amount: number;
  private currency: string;
  private createdTx: any;
  private message: string;
  private invoiceId: string;
  private configWallet: any;
  private currencyIsoCode: string;
  private FEE_TOO_HIGH_LIMIT_PER: number;

  public wallet: any;
  public wallets: any;
  public totalAmountStr: string;
  public invoiceFee: number;
  public networkFee: number;
  public totalAmount: number;
  public amazonGiftCard: any;
  public amountUnitStr: string;
  public limitPerDayMessage: string;
  public network: string;
  public walletSelectorTitle: string;

  constructor(
    private amazonProvider: AmazonProvider,
    private bwcErrorProvider: BwcErrorProvider,
    private bwcProvider: BwcProvider,
    private configProvider: ConfigProvider,
    private emailNotificationsProvider: EmailNotificationsProvider,
    private events: Events,
    private externalLinkProvider: ExternalLinkProvider,
    private logger: Logger,
    private modalCtrl: ModalController,
    private navCtrl: NavController,
    private navParams: NavParams,
    private onGoingProcessProvider: OnGoingProcessProvider,
    private popupProvider: PopupProvider,
    private profileProvider: ProfileProvider,
    private txFormatProvider: TxFormatProvider,
    private walletProvider: WalletProvider,
    private translate: TranslateService
  ) {
    this.FEE_TOO_HIGH_LIMIT_PER = 15;
    this.configWallet = this.configProvider.get().wallet;
    this.amazonGiftCard = null;
    this.bitcoreCash = this.bwcProvider.getBitcoreCash();
  }

  ionViewDidLoad() {
    this.logger.info('ionViewDidLoad BuyAmazonPage');
  }

  ionViewWillEnter() {
    this.amount = this.navParams.data.amount;
    this.currency = this.navParams.data.currency;

    let limitPerDay = this.amazonProvider.limitPerDay;

    this.limitPerDayMessage = "Purchase Amount is limited to " + limitPerDay + " " + this.currency + " per day"; // TODO: translate

    if (this.amount > this.amazonProvider.limitPerDay) {
      this.showErrorAndBack(null, this.limitPerDayMessage);
      return;
    }

    this.network = this.amazonProvider.getNetwork();
    this.wallets = this.profileProvider.getWallets({
      onlyComplete: true,
      network: this.network,
      hasFunds: true,
    });
    if (_.isEmpty(this.wallets)) {
      this.showErrorAndBack(null, this.translate.instant('No wallets available'));
      return;
    }
    this.showWallets(); // Show wallet selector
  }

  private checkFeeHigh(amount: number, fee: number) {
    let per = fee / (amount + fee) * 100;

    if (per > this.FEE_TOO_HIGH_LIMIT_PER) {
      let feeWarningModal = this.modalCtrl.create(FeeWarningPage, {}, { showBackdrop: false, enableBackdropDismiss: false });
      feeWarningModal.present();
    }
  }

  public openExternalLink(url: string) {
    this.externalLinkProvider.open(url);
  }

  private _resetValues() {
    this.totalAmountStr = this.invoiceFee = this.networkFee = this.totalAmount = this.wallet = null;
    this.createdTx = this.message = this.invoiceId = null;
  }

  private showErrorAndBack(title: string, msg: any) {
    title = title ? title : this.translate.instant('Error');
    this.logger.error(msg);
    msg = (msg && msg.errors) ? msg.errors[0].message : msg;
    this.popupProvider.ionicAlert(title, msg).then(() => {
      this.navCtrl.pop();
    });
  }

  private showError = function (title: string, msg: any): Promise<any> {
    return new Promise((resolve, reject) => {
      title = title || this.translate.instant('Error');
      this.logger.error(msg);
      msg = (msg && msg.errors) ? msg.errors[0].message : msg;
      this.popupProvider.ionicAlert(title, msg).then(() => {
        return resolve();
      });
    });
  }

  private publishAndSign(wallet: any, txp: any): Promise<any> {
    return new Promise((resolve, reject) => {
      if (!wallet.canSign() && !wallet.isPrivKeyExternal()) {
        let err = this.translate.instant('No signing proposal: No private key');
        this.logger.info(err);
        return reject(err);
      }

      this.walletProvider.publishAndSign(wallet, txp).then((txp: any) => {
        this.onGoingProcessProvider.clear();
        return resolve(txp);
      }).catch((err: any) => {
        this.onGoingProcessProvider.clear();
        return reject(err);
      });
    });
  }

  private satToFiat(coin: string, sat: number): Promise<any> {
    return new Promise((resolve, reject) => {
      this.txFormatProvider.toFiat(coin, sat, this.currencyIsoCode).then((value: string) => {
        return resolve(value);
      });
    });
  }

  private setTotalAmount(wallet: any, amountSat: number, invoiceFeeSat: number, networkFeeSat: number) {
    this.satToFiat(wallet.coin, amountSat).then((a: string) => {
      this.amount = Number(a);

      this.satToFiat(wallet.coin, invoiceFeeSat).then((i: string) => {
        this.invoiceFee = Number(i);

        this.satToFiat(wallet.coin, networkFeeSat).then((n: string) => {
          this.networkFee = Number(n);
          this.totalAmount = this.amount + this.invoiceFee + this.networkFee;
        });
      });
    });
  }

  private isCryptoCurrencySupported(wallet: any, invoice: any) {
    let COIN = wallet.coin.toUpperCase();
    if (!invoice['supportedTransactionCurrencies'][COIN]) return false;
    return invoice['supportedTransactionCurrencies'][COIN].enabled;
  }

  private createInvoice(data: any): Promise<any> {
    return new Promise((resolve, reject) => {
      this.amazonProvider.createBitPayInvoice(data, (err: any, dataInvoice: any) => {
        if (err) {
          let err_title = this.translate.instant('Error creating the invoice');
          let err_msg;
          if (err && err.message && err.message.match(/suspended/i)) {
            err_title = this.translate.instant('Service not available');
            err_msg = this.translate.instant('Amazon.com is not available at this moment. Please try back later.');
          } else if (err && err.message) {
            err_msg = err.message;
          } else {
            err_msg = this.translate.instant('Could not access to Amazon.com');
          };

          return reject({
            title: err_title,
            message: err_msg
          });
        }

        let accessKey = dataInvoice ? dataInvoice.accessKey : null;

        if (!accessKey) {
          return reject({
            message: this.translate.instant('No access key defined')
          });
        }

        this.amazonProvider.getBitPayInvoice(dataInvoice.invoiceId, (err: any, invoice: any) => {
          if (err) {
            return reject({
              message: this.translate.instant('Could not get the invoice')
            });
          }

          return resolve({ invoice, accessKey });
        });
      });
    });
  }

  private createTx(wallet: any, invoice: any, message: string): Promise<any> {
    let COIN = wallet.coin.toUpperCase();
    return new Promise((resolve, reject) => {
      let payProUrl = (invoice && invoice.paymentCodes) ? invoice.paymentCodes[COIN].BIP73 : null;

      if (!payProUrl) {
        return reject({
          title: this.translate.instant('Error in Payment Protocol'),
          message: this.translate.instant('Invalid URL')
        });
      }

      let outputs = [];
      let toAddress = invoice.addresses[COIN];
      let amountSat = invoice.paymentTotals[COIN];

      outputs.push({
        'toAddress': toAddress,
        'amount': amountSat,
        'message': message
      });

      let txp = {
        toAddress,
        amount: amountSat,
        outputs,
        message,
        payProUrl,
        excludeUnconfirmedUtxos: this.configWallet.spendUnconfirmed ? false : true,
        feeLevel: this.configWallet.settings.feeLevel ? this.configWallet.settings.feeLevel : 'normal'
      };

      txp['origToAddress'] = txp.toAddress;

      if (wallet.coin && wallet.coin == 'bch') {
        // Use legacy address
        txp.toAddress = this.bitcoreCash.Address(txp.toAddress).toString();
        txp.outputs[0].toAddress = txp.toAddress;
      }

      this.walletProvider.createTx(wallet, txp).then((ctxp: any) => {
        return resolve(ctxp);
      }).catch((err: any) => {
        return reject({
          title: this.translate.instant('Could not create transaction'),
          message: this.bwcErrorProvider.msg(err)
        });
      });
    });
  }

  private checkTransaction = _.throttle((count: number, dataSrc: any) => {
    this.amazonProvider.createGiftCard(dataSrc, (err, giftCard) => {
      this.logger.debug("creating gift card " + count);
      if (err) {
        giftCard = giftCard || {};
        giftCard['status'] = 'FAILURE';
      }

      let now = moment().unix() * 1000;

      let newData = giftCard;
      newData.invoiceId = dataSrc.invoiceId;
      newData.accessKey = dataSrc.accessKey;
      newData.invoiceUrl = dataSrc.invoiceUrl;
      newData.amount = dataSrc.amount;
      newData.date = dataSrc.invoiceTime || now;
      newData.uuid = dataSrc.uuid;

      if (newData.status == 'expired') {
        this.amazonProvider.savePendingGiftCard(newData, {
          remove: true
        }, (err: any) => {
          this.logger.error(err);
          this.onGoingProcessProvider.clear();
          this.showError(null, this.translate.instant('Gift card expired'));
        });
        return;
      }

      if (giftCard.status == 'PENDING' && count < 3) {
        this.logger.debug("Waiting for payment confirmation");
        this.amazonProvider.savePendingGiftCard(newData, null, (err: any) => {
          this.logger.debug("Saving gift card with status: " + newData.status);
        });
        this.checkTransaction(count + 1, dataSrc);
        return;
      }

      this.amazonProvider.savePendingGiftCard(newData, null, (err: any) => {
        this.onGoingProcessProvider.clear();
        this.logger.debug("Saved new gift card with status: " + newData.status);
        this.amazonGiftCard = newData;
        this.openFinishModal();
      });
    });
  }, 15000, {
      'leading': true
    });

  private initialize(wallet: any): void {
    let COIN = wallet.coin.toUpperCase();
    let email = this.emailNotificationsProvider.getEmailIfEnabled();
    let parsedAmount = this.txFormatProvider.parseAmount(wallet.coin, this.amount, this.currency);
    this.currencyIsoCode = parsedAmount.currency;
    this.amountUnitStr = parsedAmount.amountUnitStr;
    let dataSrc = {
      amount: parsedAmount.amount,
      currency: parsedAmount.currency,
      uuid: wallet.id,
      email,
      buyerSelectedTransactionCurrency: COIN
    };
    this.onGoingProcessProvider.set('loadingTxInfo');

    this.createInvoice(dataSrc).then((data: any) => {
      let invoice = data.invoice;
      let accessKey = data.accessKey;

      if (!this.isCryptoCurrencySupported(wallet, invoice)) {
        this.onGoingProcessProvider.clear();
        let msg = this.translate.instant('Purchases with this cryptocurrency is not enabled');
        this.showErrorAndBack(null, msg);
        return;
      }

      // Sometimes API does not return this element;
      invoice['minerFees'][COIN]['totalFee'] = invoice.minerFees[COIN].totalFee || 0;
      let invoiceFeeSat = invoice.minerFees[COIN].totalFee;

      this.message = this.amountUnitStr + " for Amazon.com Gift Card"; // TODO: translate

      this.createTx(wallet, invoice, this.message).then((ctxp: any) => {
        this.onGoingProcessProvider.clear();


        // Save in memory
        this.createdTx = ctxp;
        this.invoiceId = invoice.id;

        this.createdTx.giftData = {
          currency: dataSrc.currency,
          amount: dataSrc.amount,
          uuid: dataSrc.uuid,
          accessKey,
          invoiceId: invoice.id,
          invoiceUrl: invoice.url,
          invoiceTime: invoice.invoiceTime
        };
        this.totalAmountStr = this.txFormatProvider.formatAmountStr(wallet.coin, ctxp.amount);

        // Warn: fee too high
        this.checkFeeHigh(Number(parsedAmount.amountSat), Number(invoiceFeeSat) + Number(ctxp.fee));

        this.setTotalAmount(wallet, parsedAmount.amountSat, invoiceFeeSat, ctxp.fee);
      }).catch((err: any) => {
        this.onGoingProcessProvider.clear();
        this._resetValues();
        this.showError(err.title, err.message);
        return;
      });
    }).catch((err: any) => {
      this.onGoingProcessProvider.clear();
      this.showErrorAndBack(err.title, err.message);
      return;
    });
  }

  public buyConfirm() {
    if (!this.createdTx) {
      this.showError(null, this.translate.instant('Transaction has not been created'));
      return;
    }
    let title = this.translate.instant('Confirm');
    let okText = this.translate.instant('OK');
    let cancelText = this.translate.instant('Cancel');
    this.popupProvider.ionicConfirm(title, this.message, okText, cancelText).then((ok) => {
      if (!ok) {
        return;
      }

      this.publishAndSign(this.wallet, this.createdTx).then((txSent) => {
        this.onGoingProcessProvider.set('buyingGiftCard');
        this.checkTransaction(1, this.createdTx.giftData);
      }).catch((err: any) => {
        this._resetValues();
        this.showError(this.translate.instant('Could not send transaction'), err);
        return;
      });
    });
  }

  public onWalletSelect(wallet: any): void {
    this.wallet = wallet;
    this.initialize(wallet);
  }

  public showWallets(): void {
    let id = this.wallet ? this.wallet.credentials.walletId : null;
    this.events.publish('showWalletsSelectorEvent', this.wallets, id, 'Buy from');
    this.events.subscribe('selectWalletEvent', (wallet: any) => {
      if (!_.isEmpty(wallet)) this.onWalletSelect(wallet);
      this.events.unsubscribe('selectWalletEvent');
    });
  }

  private openFinishModal(): void {
    let finishComment: string;
    let cssClass: string;
    if (this.amazonGiftCard.status == 'FAILURE') {
      finishComment = 'Your purchase could not be completed';
      cssClass = 'danger';
    }
    if (this.amazonGiftCard.status == 'PENDING') {
      finishComment = 'Your purchase was added to the list of pending';
      cssClass = 'warning';
    }
    if (this.amazonGiftCard.status == 'SUCCESS') {
      finishComment = 'Bought ' + this.amountUnitStr;
    }
    if (this.amazonGiftCard.status == 'SUCCESS') {
      finishComment = 'Gift card generated and ready to use.';
    }
    let finishText = '';
    let modal = this.modalCtrl.create(FinishModalPage, { finishText, finishComment, cssClass }, { showBackdrop: true, enableBackdropDismiss: false });
    modal.present();
    modal.onDidDismiss(() => {
      this.navCtrl.popToRoot({ animate: false });
      this.navCtrl.push(AmazonPage, { invoiceId: this.invoiceId });
    });
  }

}