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 https://github.com/nimiq/qr-creator
 jquery-qrcode v0.14.0 - https://larsjung.de/jquery-qrcode/ */
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// no static class variables because those are not supported on mobile
var LnMePaymentRequestTemplate = `<div id="lnme-wrapper" class="lnme-wrapper">
    <h1 class="lnme-headline"><span class="lnme-memo"><span></h1>
    <h2 class="lnme-headline"><span class="lnme-value"></span> Sats</h2>
    <div class="lnme-qrcode"></div>
    <div class="lnme-details">
      <a href="#" class="lnme-link"><span class="lnme-payment-request"></span></a>
      <div class="lnme-copy">
        <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-copy"><rect x="9" y="9" width="13" height="13" rx="2" ry="2"></rect><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"></path></svg>
      </div>
    </div>
  </div>`;
var LnMePaymentConfirmationTemplate = `<h1 class="lnme-header lnme-confirmation">Payment sent!</h1>`;

class LnMe {

  constructor(options) {
    options = options || {};
    this.script = document.querySelector("[src*='lnme.js']");
    if (options.baseURL) {
      this.baseURL = options.baseURL;
    } else if (this.script && this.script.dataset.lnmeBaseUrl) {
      this.baseURL = this.script.dataset.lnmeBaseUrl;
    } else {
      this.baseURL = `${document.location.protocol}//${document.location.host}`;
    }
    if (options.watchPaymentUrl) {
      this.watchPaymentUrl = options.watchPaymentUrl.bind(this);
    }
    if (options.createInvoiceUrl) {
      this.createInvoiceUrl = options.createInvoiceUrl.bind(this);
    }
    if (options.newAddressUrl) {
      this.newAddressUrl = options.newAddressUrl.bind(this);
    }
    this.value = parseInt(options.value || 0);
    this.memo = options.memo || '';
    this.target = options.target;
    this.loadStylesheet(); // load it early that styles are ready when the popup is opened
  }

  watchPaymentUrl() {
    return `${this.baseURL}/v1/invoice/${this.invoice.payment_hash}`;
  }

  createInvoiceUrl() {
    return `${this.baseURL}/v1/invoices`;
  }

  newAddressUrl() {
    return `${this.baseURL}/v1/newaddress`;
  }

  loadStylesheet() {
    if (document.getElementById('lnme-style')) { return; }
    // get the CSS file from the same source as the JS widget file
    let source = `${this.baseURL}/lnme/lnme.css`;
    let head = document.getElementsByTagName('head')[0];
    let css = document.createElement('link');
    css.id = "lnme-style";
    css.rel = "stylesheet";
    css.type = "text/css";
    css.href = source
    head.appendChild(css);
  }

  watchPayment() {
    if (this.paymentWatcher) { window.clearInterval(this.paymentWatcher) }

    return new Promise((resolve, reject) => {
      this.paymentWatcher = window.setInterval(() => {
        this._fetch(this.watchPaymentUrl())
          .then((invoice) => {
            if (invoice.settled) {
              this.invoice.settled = true;
              this.stopWatchingPayment();
              resolve(this.invoice);
            }
          });
      }, 2000);
    });
  }

  stopWatchingPayment() {
    window.clearInterval(this.paymentWatcher);
    this.paymentWatcher = null;
  }

  payWithWebln() {
    if (!webln.isEnabled) {
      webln.enable().then((weblnResponse) => {
        return webln.sendPayment(this.invoice.payment_request);
      }).catch((e) => {
        return this.showPaymentRequest();
      })
    } else {
      return webln.sendPayment(this.invoice.payment_request);
    }
  }

  populatePaymentRequest() {
    document.querySelectorAll('.lnme-memo').forEach(e => {
      e.innerHTML = this.memo;
    });
    document.querySelectorAll('.lnme-value').forEach(e => {
      e.innerHTML = this.value;
    });
    document.querySelectorAll('.lnme-payment-request').forEach(e => {
      e.innerHTML = this.invoice.payment_request;
    });
    document.querySelectorAll('.lnme-link').forEach(e => {
      e.setAttribute('href', `lightning:${this.invoice.payment_request}`);
    });
    QrCreator.render({ text: this.invoice.payment_request, size: 128}, this.target.querySelector('.lnme-qrcode'));
    this.target.querySelectorAll('.lnme-copy').forEach(element => {
      element.addEventListener('click', (e) => {
        navigator.clipboard.writeText(this.invoice.payment_request).then(() => {
          alert('Copied to clipboad');
        });
      });
    });
  }

  showPaymentRequest() {
    this.render(LnMePaymentRequestTemplate);
    this.populatePaymentRequest()
    return Promise.resolve(); // be compatible to payWithWebln()
  }

  addInvoice() {
    let args = {
      method: 'POST',
      mode: 'cors',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ memo: this.memo, value: this.value })
    };
    return this._fetch(
      this.createInvoiceUrl(),
      args
      ).then((invoice) => {
        this.invoice = invoice;
        return invoice;
      });
  }

  newAddress() {
    let args = {
      method: 'POST',
      mode: 'cors',
      header: { 'Content-Type': 'application/json' }
    };
    return this._fetch(this.newAddressUrl(), args)
      .then(address => {
        this.address = address;
        return address;
      });
  }

  requestPayment() {
    return this.addInvoice().then((invoice) => {
      if (typeof webln !== 'undefined') {
        return this.payWithWebln();
      } else {
        return this.showPaymentRequest();
      }
    });
  }

  request() {
    return this.requestPayment().then(() => {
      this.watchPayment().then((invoice) => {
        this.thanks();
      });
    });
  }

  _fetch(url, args) {
    return fetch(url, args).then((response) => {
      if (response.ok) {
        return response.json();
      } else {
        throw new Error(response);
      }
    });
  }

  closePopup() {
    if (this.popup) {
      this.popup.close();
      this.popup = null;
    }
  }

  render(content) {
    this.closePopup();
    this.popup = new jPopup({
      content: content,
      shouldSetHash: false
    });
    this.target = document.querySelector('.jPopup .content').firstElementChild;

    // When popup is closed, we stop watching the payment.
    document.querySelector('.jCloseBtn').addEventListener('click', (e) => {
      this.stopWatchingPayment();
    });
  }

  thanks() {
    this.target.innerHTML = LnMePaymentConfirmationTemplate;
  }
}
