import ReactDOM from "react-dom";
import JoinUs from "./components/join/join.jsx";
import { ReactGA } from "../js/common";

/**
 * Logic for the Newsletter form that slides down from the top of page
 * when the "Newsletter" button is clicked in the navigation bar.
 *
 */

const elements = {
  primaryNav: `.primary-nav-container`,
  narrowMenuContainer: `.primary-nav-container .narrow-screen-menu-container`,
  wideMenuContainer: `.primary-nav-container .wide-screen-menu-container`,
  buttonMobile: `.primary-nav-container .narrow-screen-menu-container .btn-newsletter`,
  buttonDesktop: `.primary-nav-container .wide-screen-menu-container .btn-newsletter`,
  container: `#nav-newsletter-form-wrapper`,
  joinUs: `#nav-newsletter-form-wrapper .join-us.on-nav`,
  buttonDismiss: `#nav-newsletter-form-wrapper .form-dismiss`,
};

class NavNewsletter {
  constructor() {
    this.visible = false;
    this.form = null;
  }

  isVisible() {
    return this.visible;
  }

  // Reset form
  resetForm() {
    this.form.reset();

    let handleTransitionend = () => {
      elements.container.removeEventListener(
        "transitionend",
        handleTransitionend
      );
      elements.buttonDismiss.textContent = "No thanks";
    };
    elements.container.addEventListener("transitionend", handleTransitionend);
  }

  // For desktop+ version:
  // transition section to its close state,
  // remove the global 'closeFormClickHandler' click event handler
  // and reset the form
  closeDesktopNewsletter(event) {
    const wrapper = elements.container;
    wrapper.classList.remove("expanded");
    elements.buttonDesktop.classList.remove("active");
    // Schedule a "display:none" to happen after the `expanded` animation finishes.
    // See `#nav-newsletter-form-wrapper` transition in ./source/sass/components/primary-nav.scss
    setTimeout(() => {
      if (wrapper.classList.contains("expanded")) return;
      wrapper.classList.add("d-none");
    }, 500);
    // Make sure we don't leak event listeners
    document.removeEventListener("click", this.closeFormClickHandler);
    document.removeEventListener("scroll", this.closeFormClickHandler);
    this.resetForm();
    this.visible = false;
  }

  // For desktop+ version:
  // transition newsletter section to its expanded state
  expandDesktopNewsletter(event) {
    const wrapper = elements.container;
    wrapper.classList.remove("d-none");
    wrapper.style.top = `${elements.primaryNav.offsetHeight}px`;
    wrapper.classList.add("expanded");
    elements.buttonDesktop.classList.add("active");
    document.addEventListener(`click`, this.closeFormClickHandler);
    document.addEventListener(`scroll`, this.closeFormClickHandler, {
      passive: true,
    });
    this.visible = true;
  }

  // For mobile version:
  // transition newsletter section to its close state,
  // remove the global 'closeFormClickHandler' click event handler,
  // and reset the form
  closeMobileNewsletter() {
    const wrapper = elements.container;
    elements.narrowMenuContainer.classList.remove("d-none");
    wrapper.classList.remove("faded-in");
    // Schedule a "display:none" to happen after the `expanded` animation finishes.
    // See `#nav-newsletter-form-wrapper` transition in ./source/sass/components/primary-nav.scss
    setTimeout(() => {
      if (wrapper.classList.contains("expanded")) return;
      wrapper.classList.add("d-none");
    }, 500);
    this.resetForm();
    this.visible = false;
  }

  // For mobile version:
  // transition section to its expanded state
  expandMobileNewsletter() {
    const wrapper = elements.container;
    elements.narrowMenuContainer.classList.add(`d-none`);
    wrapper.classList.remove("d-none");
    wrapper.classList.add("faded-in");
    this.visible = true;
  }

  // For desktop+ version:
  // create click handler to detect clicking event outside of the newsletter section
  closeFormClickHandler(event) {
    // close newsletter section if clicking anywhere outside of the section
    if (
      !elements.container.contains(event.target) &&
      event.target !== elements.container
    ) {
      navNewsletter.closeDesktopNewsletter();
      // Make sure we don't leak event listeners:
      document.removeEventListener("click", this.closeFormClickHandler);
      document.removeEventListener("scroll", this.closeFormClickHandler);
    }
  }

  /**
   * Find and bind all necessary DOM nodes, returning "false" if not all DOM nodes were found.
   */
  checkDomNodes() {
    return Object.keys(elements).every((key) => {
      // if this element already resolved to a DOM node, move on to the next
      let value = elements[key];
      if (typeof value !== "string") return true;

      // find this DOM node, and report on the result (binding it if found for later use)
      let element = document.querySelector(value);
      if (element) elements[key] = element;

      return !!element;
    });
  }

  buttonDesktopClickHandler(event) {
    if (!this.visible) {
      event.stopPropagation();
      this.expandDesktopNewsletter();

      ReactGA.event({
        category: `signup`,
        action: `newsletter tap`,
        label: `newsletter button from header`,
      });
    } else {
      this.closeDesktopNewsletter();
    }
  }

  init(foundationSiteURL) {
    // some DOM nodes do not exist, return
    if (!this.checkDomNodes()) return;

    var props = elements.joinUs.dataset;
    props.apiUrl = `${foundationSiteURL}/api/campaign/signups/${
      props.signupId || 0
    }/`;
    props.isHidden = false;
    this.form = ReactDOM.render(<JoinUs {...props} />, elements.joinUs);

    // For desktop+ version:
    // make 'buttonDesktop' the trigger to open newsletter section
    elements.buttonDesktop.addEventListener(`click`, (event) => {
      this.buttonDesktopClickHandler(event);
    });

    // For mobile version:
    // make 'buttonDismiss' the trigger to close newsletter section
    elements.buttonDismiss.addEventListener("click", () => {
      this.closeMobileNewsletter();
    });

    // For mobile version:
    // make 'buttonMobile' the trigger to show newsletter section
    elements.buttonMobile.addEventListener("click", () => {
      this.expandMobileNewsletter();

      ReactGA.event({
        category: `signup`,
        action: `newsletter tap`,
        label: `newsletter button from header`,
      });
    });
  }
}

const navNewsletter = new NavNewsletter();

export default navNewsletter;