import BaseComponent from 'bootstrap/js/src/base-component.js';
import EventHandler from 'bootstrap/js/src/dom/event-handler';
import SelectorEngine from 'bootstrap/js/src/dom/selector-engine';
import Manipulator from 'bootstrap/js/src/dom/manipulator';
import onDocumentScroll from './util/on-document-scroll.js';
import NavBarCollapsible from './navbar-collapsible.js';
import { documentScrollTo } from './util/tween.js';

const NAME = 'navscroll';
//const DATA_KEY = 'bs.navscroll'
//const EVENT_KEY = `.${DATA_KEY}`
//const DATA_API_KEY = '.data-api'

//const EVENT_SCROLL = `scroll${EVENT_KEY}`

const CLASS_NAME_ACTIVE = 'active';

const SELECTOR_NAVSCROLL = '[data-bs-navscroll]'; //'.it-navscroll-wrapper'
const SELECTOR_LIST = 'ul.link-list';
//const SELECTOR_ITEM = '.nav-item'
const SELECTOR_LINK_CONTAINER = 'li.nav-link, li.nav-item';
const SELECTOR_LINK = 'a.nav-link';
const SELECTOR_LINK_ACTIVE = `${SELECTOR_LINK}.${CLASS_NAME_ACTIVE}`;
const SELECTOR_LINK_CLICKABLE = `${SELECTOR_LINK}[href^="#"]`;
const SELECTOR_CONTAINER = '.it-page-sections-container';
const SELECTOR_PAGE_SECTION = '.it-page-section';
const SELECTOR_TOGGLER = '.custom-navbar-toggler';
const SELECTOR_TOGGLER_ICON = '.it-list';
const SELECTOR_COLLAPSIBLE = '.navbar-collapsable';
const SELECTOR_PROGRESS_BAR = '.it-navscroll-progressbar';

const Default = {
  scrollPadding: 10,
  duration: 800,
  easing: 'easeInOutSine',
};
class NavScroll extends BaseComponent {
  constructor(element, config) {
    super(element);

    this._config = this._getConfig(config);

    this._togglerElement = SelectorEngine.findOne(SELECTOR_TOGGLER, this._element);
    this._sectionContainer = SelectorEngine.findOne(SELECTOR_CONTAINER);
    this._collapsible = this._getCollapsible();
    this._isCollapseOpened = false;
    this._callbackQueue = [];
    this._scrollCb = null;

    this._bindEvents();
  }
  // Getters

  static get NAME() {
    return NAME
  }

  // Public
  setScrollPadding(scrollPadding) {
    this._config.scrollPadding = scrollPadding;
  }

  dispose() {
    //EventHandler.off(window, EVENT_SCROLL, this._onScroll)
    if (this._scrollCb) {
      this._scrollCb.dispose();
    }

    super.dispose();
  }

  // Private
  _getConfig(config) {
    config = {
      ...Default,
      ...Manipulator.getDataAttributes(this._element),
      ...(typeof config === 'object' ? config : {}),
    };
    return config
  }

  _bindEvents() {
    //EventHandler.on(window, EVENT_SCROLL, this._onScroll)

    this._scrollCb = onDocumentScroll(() => this._onScroll());

    if (this._collapsible) {
      EventHandler.on(this._collapsible._element, 'shown.bs.navbarcollapsible', () => this._onCollapseOpened());
      EventHandler.on(this._collapsible._element, 'hidden.bs.navbarcollapsible', () => this._onCollapseClosed());
    }

    SelectorEngine.find(SELECTOR_LINK_CLICKABLE, this._element).forEach((link) => {
      link.addEventListener('click', () => {
        const scrollHash = () => this._scrollToHash(link.hash);
        if (this._isCollapseOpened) {
          this._callbackQueue.push(scrollHash);
          this._collapsible.hide();
        } else {
          scrollHash();
        }
      });
    });

    EventHandler.on(window, 'load', () => {
      //if page is already scrolled
      setTimeout(() => this._onScroll(), 150);
    });
  }

  _onCollapseOpened() {
    this._isCollapseOpened = true;
  }
  _onCollapseClosed() {
    while (this._callbackQueue.length > 0) {
      const cb = this._callbackQueue.shift();
      if (typeof cb === 'function') {
        cb();
      }
    }
    this._isCollapseOpened = false;
  }

  _getParentLinks(element) {
    const parents = [];
    let parentContainer = element.closest(SELECTOR_LIST);
    let parentContainerPrev = null;
    let exit = false;
    while (parentContainer && !exit) {
      const parentLinkContainer = parentContainer.closest(SELECTOR_LINK_CONTAINER);
      if (parentLinkContainer) {
        const link = parentLinkContainer.querySelector(SELECTOR_LINK);
        if (link) {
          parents.push(link);
        }
      }
      parentContainerPrev = parentContainer;
      parentContainer = (parentContainer.parentElement || parentContainer).closest(SELECTOR_LIST); //avoid self select of closest
      if (parentContainer === parentContainerPrev) {
        exit = true;
      }
    }
    return parents
  }

  _decorateToggler(text) {
    if (this._togglerElement) {
      const icon = SelectorEngine.findOne(SELECTOR_TOGGLER_ICON, this._togglerElement);
      this._togglerElement.innerText = '';
      this._togglerElement.textContent = '';
      this._togglerElement.append(icon);
      this._togglerElement.append(text);
    }
  }

  _scrollToHash(hash) {
    const target = SelectorEngine.findOne(hash, this._sectionContainer);
    if (target) {
      documentScrollTo(target.offsetTop - this._getScrollPadding(), {
        duration: this._config.duration,
        easing: this._config.easing,
        /*complete: () => {
        },*/
      });

      if (history.pushState) {
        history.pushState(null, null, hash);
      } else {
        location.hash = hash;
      }
    }
  }

  _updateProgress(content) {
    if (!content) {
      return
    }
    const progressBars = SelectorEngine.find(SELECTOR_PROGRESS_BAR);
    if (progressBars) {
      const offset = Math.abs(content.getBoundingClientRect().top);
      const height = content.getBoundingClientRect().height;
      const scrollAmount = (offset / height) * 100;
      const scrollValue = Math.min(100, Math.max(0, scrollAmount));

      progressBars.forEach((progressBar) => {
        if (content.getBoundingClientRect().top <= 0) {
          progressBar.style.width = scrollValue + '%';
          progressBar.setAttribute('aria-valuenow', scrollValue);
        } else {
          progressBar.style.width = 0 + '%';
          progressBar.setAttribute('aria-valuenow', 0);
        }
      });
    }
  }

  _onScroll() {
    const sectionsContainerTop = this._sectionContainer ? this._sectionContainer.offsetTop : 0;
    if (typeof document === 'undefined') {
      return
    }
    const scrollDistance = document.scrollingElement.scrollTop - sectionsContainerTop;

    const navItems = SelectorEngine.find(SELECTOR_LINK, this._element);

    const scrollPadding = this._getScrollPadding();

    SelectorEngine.find(SELECTOR_PAGE_SECTION).forEach((pageSec, idx) => {
      if (pageSec.offsetTop - sectionsContainerTop <= scrollDistance + scrollPadding) {
        SelectorEngine.find(SELECTOR_LINK_ACTIVE, this._element).forEach((link) => {
          link.classList.remove(CLASS_NAME_ACTIVE);
        });
        if (idx < navItems.length) {
          const currActive = navItems[idx];
          this._getParentLinks(currActive).forEach((parentLink) => {
            parentLink.classList.add(CLASS_NAME_ACTIVE);
          });
          currActive.classList.add(CLASS_NAME_ACTIVE);
          this._decorateToggler(currActive.innerText);
        }
      }
    });
    this._updateProgress(this._sectionContainer);
  }

  _getCollapsible() {
    const coll = SelectorEngine.findOne(SELECTOR_COLLAPSIBLE, this._element);
    if (coll) {
      return NavBarCollapsible.getOrCreateInstance(coll)
    }
    return null
  }

  _getScrollPadding() {
    if (typeof this._config.scrollPadding === 'function') {
      return this._config.scrollPadding()
    }
    return this._config.scrollPadding
  }
}

/**
 * ------------------------------------------------------------------------
 * Data Api implementation
 * ------------------------------------------------------------------------
 */

const navs = SelectorEngine.find(SELECTOR_NAVSCROLL);
navs.map((nav) => {
  NavScroll.getOrCreateInstance(nav);
});

export { NavScroll as default };
//# sourceMappingURL=navscroll.js.map
