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const dataURItoBlob = (dataURI, type) => {
    const byteString = atob(dataURI.split(',')[1]);
    const ab = new ArrayBuffer(byteString.length);
    const ia = new Uint8Array(ab);
    for (let i = 0; i < byteString.length; i++) {
        ia[i] = byteString.charCodeAt(i);
    }

    return new Blob([ab], {
        type

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function paginate(query = {}, options = {}, callback) {
    const limit = options.limit || 10;
    let page = options.page || 1;

    const countQuery = this.find(query).count();
    return new Promise(resolve => {
        countQuery.exec().then(count => {

            const pages = Math.ceil(count / limit) || 1;

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// Given a number, say prod (for product), we search two Fibonacci numbers F(n) and F(n+1) verifying F(n) * F(n+1) = prod
// My solution to the code wars challenge https://www.codewars.com/kata/5541f58a944b85ce6d00006a/train/javascript

// Not used for this, but here's some code to test if a number is in the Fibonacci sequence.
// const isPerfectSquare = num => {
//   const sq = Math.sqrt(num);
//   return sq * sq === num;
// }
// const isFib = num => {
//   return isPerfectSquare(5 * num * num + 4) || isPerfectSquare(5 * num * num - 4);

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const deepEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b);

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import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';

const ANIMATION_DURATION = 1000;

class BatchDropZone extends React.Component {

  static propTypes = {

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schema.statics = {
    getSingleton: function (cb) {
        this.findOne()
            .sort({ updated: -1 })
            .limit(1)
            .exec((err, model) => {
                if (err) {
                    cb(err, null);
                } else if (!model) {
                    cb(err, new this());

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  if (isEnabled) {
    // Get all the vendors in your crate. The creator of the crate (you) is
    // added as a default vendor.
    const { data: vendors } = await cargo.api.getCrateVendors(CRATE_ID);

    // Map through each vendor and get the token contracts they created.
    const contractResponses = await Promise.all(
      vendors.map(({ vendorId }) => cargo.api.getVendorTokenContracts(vendorId))
    );

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// Get the resale items for our contracts. This method
// takes a list of token contract IDs, not addresses. 
// The IDs are assigned by Cargo and used internally
const { data: resaleItems} = await cargo.api.getContractResaleItems(
  contracts.map(contract => contract.tokenContractId)
);

// Pass our contract data and resale items to a function that will create some markup
// and add it to the page.
displayContractContent(contracts, resaleItems);

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function displayContractContent(contracts, resaleItems) {
  let template = '';
  contracts.forEach(contract => {
    const { name, symbol, tokenAddress, tokenContractId } = contract;
    const currentResaleItems = resaleItems[tokenContractId];

    let tokenMarkup = '';
    currentResaleItems.forEach(token => {
      const { metadata, price } = token;

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const tokenRows = document.querySelector('[data-id="token-rows"]');
const txConfirmation = document.querySelector('[data-id="tx-confirmation"]');

// This listener checks to see if we clicked the buy now button
tokenRows.addEventListener('click', async evt => {
  // If the target is the buy now button
  if (evt.target.dataset.id === 'buy-now') {
    
    // We want to get the resale ID and price we set on the button via
    // data attributes.