/*!
 * (C) Ionic http://ionicframework.com - MIT License
 */
import { proxyCustomElement, HTMLElement, createEvent, h, Build } from '@stencil/core/internal/client';
import { b as getIonMode, c as config } from './ionic-global.js';
import { g as getTimeGivenProgression } from './cubic-bezier.js';
import { m as assert, s as shallowEqualStringMap } from './helpers.js';
import { l as lifecycle, t as transition, s as setPageHidden, d as LIFECYCLE_WILL_UNLOAD, b as LIFECYCLE_WILL_LEAVE, c as LIFECYCLE_DID_LEAVE } from './index3.js';
import { a as attachComponent } from './framework-delegate.js';

const VIEW_STATE_NEW = 1;
const VIEW_STATE_ATTACHED = 2;
const VIEW_STATE_DESTROYED = 3;
// TODO(FW-2832): types
class ViewController {
  constructor(component, params) {
    this.component = component;
    this.params = params;
    this.state = VIEW_STATE_NEW;
  }
  async init(container) {
    this.state = VIEW_STATE_ATTACHED;
    if (!this.element) {
      const component = this.component;
      this.element = await attachComponent(this.delegate, container, component, ['ion-page', 'ion-page-invisible'], this.params);
    }
  }
  /**
   * DOM WRITE
   */
  _destroy() {
    assert(this.state !== VIEW_STATE_DESTROYED, 'view state must be ATTACHED');
    const element = this.element;
    if (element) {
      if (this.delegate) {
        this.delegate.removeViewFromDom(element.parentElement, element);
      }
      else {
        element.remove();
      }
    }
    this.nav = undefined;
    this.state = VIEW_STATE_DESTROYED;
  }
}
const matches = (view, id, params) => {
  if (!view) {
    return false;
  }
  if (view.component !== id) {
    return false;
  }
  return shallowEqualStringMap(view.params, params);
};
const convertToView = (page, params) => {
  if (!page) {
    return null;
  }
  if (page instanceof ViewController) {
    return page;
  }
  return new ViewController(page, params);
};
const convertToViews = (pages) => {
  return pages
    .map((page) => {
    if (page instanceof ViewController) {
      return page;
    }
    if ('component' in page) {
      return convertToView(page.component, page.componentProps === null ? undefined : page.componentProps);
    }
    return convertToView(page, undefined);
  })
    .filter((v) => v !== null);
};

const navCss = ":host{left:0;right:0;top:0;bottom:0;position:absolute;contain:layout size style;overflow:hidden;z-index:0}";

const Nav = /*@__PURE__*/ proxyCustomElement(class extends HTMLElement {
  constructor() {
    super();
    this.__registerHost();
    this.__attachShadow();
    this.ionNavWillLoad = createEvent(this, "ionNavWillLoad", 7);
    this.ionNavWillChange = createEvent(this, "ionNavWillChange", 3);
    this.ionNavDidChange = createEvent(this, "ionNavDidChange", 3);
    this.transInstr = [];
    this.animationEnabled = true;
    this.useRouter = false;
    this.isTransitioning = false;
    this.destroyed = false;
    this.views = [];
    /**
     * If `true`, the nav should animate the transition of components.
     */
    this.animated = true;
  }
  swipeGestureChanged() {
    if (this.gesture) {
      this.gesture.enable(this.swipeGesture === true);
    }
  }
  rootChanged() {
    const isDev = Build.isDev;
    if (this.root !== undefined) {
      if (!this.useRouter) {
        this.setRoot(this.root, this.rootParams);
      }
      else if (isDev) {
        console.warn('<ion-nav> does not support a root attribute when using ion-router.');
      }
    }
  }
  componentWillLoad() {
    this.useRouter = document.querySelector('ion-router') !== null && this.el.closest('[no-router]') === null;
    if (this.swipeGesture === undefined) {
      const mode = getIonMode(this);
      this.swipeGesture = config.getBoolean('swipeBackEnabled', mode === 'ios');
    }
    this.ionNavWillLoad.emit();
  }
  async componentDidLoad() {
    this.rootChanged();
    this.gesture = (await import('./swipe-back.js')).createSwipeBackGesture(this.el, this.canStart.bind(this), this.onStart.bind(this), this.onMove.bind(this), this.onEnd.bind(this));
    this.swipeGestureChanged();
  }
  connectedCallback() {
    this.destroyed = false;
  }
  disconnectedCallback() {
    for (const view of this.views) {
      lifecycle(view.element, LIFECYCLE_WILL_UNLOAD);
      view._destroy();
    }
    // Release swipe back gesture and transition.
    if (this.gesture) {
      this.gesture.destroy();
      this.gesture = undefined;
    }
    this.transInstr.length = 0;
    this.views.length = 0;
    this.destroyed = true;
  }
  /**
   * Push a new component onto the current navigation stack. Pass any additional
   * information along as an object. This additional information is accessible
   * through NavParams.
   *
   * @param component The component to push onto the navigation stack.
   * @param componentProps Any properties of the component.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  push(component, componentProps, opts, done) {
    return this.insert(-1, component, componentProps, opts, done);
  }
  /**
   * Inserts a component into the navigation stack at the specified index.
   * This is useful to add a component at any point in the navigation stack.
   *
   * @param insertIndex The index to insert the component at in the stack.
   * @param component The component to insert into the navigation stack.
   * @param componentProps Any properties of the component.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  insert(insertIndex, component, componentProps, opts, done) {
    return this.insertPages(insertIndex, [{ component, componentProps }], opts, done);
  }
  /**
   * Inserts an array of components into the navigation stack at the specified index.
   * The last component in the array will become instantiated as a view, and animate
   * in to become the active view.
   *
   * @param insertIndex The index to insert the components at in the stack.
   * @param insertComponents The components to insert into the navigation stack.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  insertPages(insertIndex, insertComponents, opts, done) {
    return this.queueTrns({
      insertStart: insertIndex,
      insertViews: insertComponents,
      opts,
    }, done);
  }
  /**
   * Pop a component off of the navigation stack. Navigates back from the current
   * component.
   *
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  pop(opts, done) {
    return this.removeIndex(-1, 1, opts, done);
  }
  /**
   * Pop to a specific index in the navigation stack.
   *
   * @param indexOrViewCtrl The index or view controller to pop to.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  popTo(indexOrViewCtrl, opts, done) {
    const ti = {
      removeStart: -1,
      removeCount: -1,
      opts,
    };
    if (typeof indexOrViewCtrl === 'object' && indexOrViewCtrl.component) {
      ti.removeView = indexOrViewCtrl;
      ti.removeStart = 1;
    }
    else if (typeof indexOrViewCtrl === 'number') {
      ti.removeStart = indexOrViewCtrl + 1;
    }
    return this.queueTrns(ti, done);
  }
  /**
   * Navigate back to the root of the stack, no matter how far back that is.
   *
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  popToRoot(opts, done) {
    return this.removeIndex(1, -1, opts, done);
  }
  /**
   * Removes a component from the navigation stack at the specified index.
   *
   * @param startIndex The number to begin removal at.
   * @param removeCount The number of components to remove.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  removeIndex(startIndex, removeCount = 1, opts, done) {
    return this.queueTrns({
      removeStart: startIndex,
      removeCount,
      opts,
    }, done);
  }
  /**
   * Set the root for the current navigation stack to a component.
   *
   * @param component The component to set as the root of the navigation stack.
   * @param componentProps Any properties of the component.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  setRoot(component, componentProps, opts, done) {
    return this.setPages([{ component, componentProps }], opts, done);
  }
  /**
   * Set the views of the current navigation stack and navigate to the last view.
   * By default animations are disabled, but they can be enabled by passing options
   * to the navigation controller. Navigation parameters can also be passed to the
   * individual pages in the array.
   *
   * @param views The list of views to set as the navigation stack.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  setPages(views, opts, done) {
    opts !== null && opts !== void 0 ? opts : (opts = {});
    // if animation wasn't set to true then default it to NOT animate
    if (opts.animated !== true) {
      opts.animated = false;
    }
    return this.queueTrns({
      insertStart: 0,
      insertViews: views,
      removeStart: 0,
      removeCount: -1,
      opts,
    }, done);
  }
  /**
   * Called by the router to update the view.
   *
   * @param id The component tag.
   * @param params The component params.
   * @param direction A direction hint.
   * @param animation an AnimationBuilder.
   *
   * @return the status.
   * @internal
   */
  setRouteId(id, params, direction, animation) {
    const active = this.getActiveSync();
    if (matches(active, id, params)) {
      return Promise.resolve({
        changed: false,
        element: active.element,
      });
    }
    let resolve;
    const promise = new Promise((r) => (resolve = r));
    let finish;
    const commonOpts = {
      updateURL: false,
      viewIsReady: (enteringEl) => {
        let mark;
        const p = new Promise((r) => (mark = r));
        resolve({
          changed: true,
          element: enteringEl,
          markVisible: async () => {
            mark();
            await finish;
          },
        });
        return p;
      },
    };
    if (direction === 'root') {
      finish = this.setRoot(id, params, commonOpts);
    }
    else {
      // Look for a view matching the target in the view stack.
      const viewController = this.views.find((v) => matches(v, id, params));
      if (viewController) {
        finish = this.popTo(viewController, Object.assign(Object.assign({}, commonOpts), { direction: 'back', animationBuilder: animation }));
      }
      else if (direction === 'forward') {
        finish = this.push(id, params, Object.assign(Object.assign({}, commonOpts), { animationBuilder: animation }));
      }
      else if (direction === 'back') {
        finish = this.setRoot(id, params, Object.assign(Object.assign({}, commonOpts), { direction: 'back', animated: true, animationBuilder: animation }));
      }
    }
    return promise;
  }
  /**
   * Called by <ion-router> to retrieve the current component.
   *
   * @internal
   */
  async getRouteId() {
    const active = this.getActiveSync();
    if (active) {
      return {
        id: active.element.tagName,
        params: active.params,
        element: active.element,
      };
    }
    return undefined;
  }
  /**
   * Get the active view.
   */
  async getActive() {
    return this.getActiveSync();
  }
  /**
   * Get the view at the specified index.
   *
   * @param index The index of the view.
   */
  async getByIndex(index) {
    return this.views[index];
  }
  /**
   * Returns `true` if the current view can go back.
   *
   * @param view The view to check.
   */
  async canGoBack(view) {
    return this.canGoBackSync(view);
  }
  /**
   * Get the previous view.
   *
   * @param view The view to get.
   */
  async getPrevious(view) {
    return this.getPreviousSync(view);
  }
  getLength() {
    return this.views.length;
  }
  getActiveSync() {
    return this.views[this.views.length - 1];
  }
  canGoBackSync(view = this.getActiveSync()) {
    return !!(view && this.getPreviousSync(view));
  }
  getPreviousSync(view = this.getActiveSync()) {
    if (!view) {
      return undefined;
    }
    const views = this.views;
    const index = views.indexOf(view);
    return index > 0 ? views[index - 1] : undefined;
  }
  /**
   * Adds a navigation stack change to the queue and schedules it to run.
   *
   * @returns Whether the transition succeeds.
   */
  async queueTrns(ti, done) {
    var _a, _b;
    if (this.isTransitioning && ((_a = ti.opts) === null || _a === void 0 ? void 0 : _a.skipIfBusy)) {
      return false;
    }
    const promise = new Promise((resolve, reject) => {
      ti.resolve = resolve;
      ti.reject = reject;
    });
    ti.done = done;
    /**
     * If using router, check to see if navigation hooks
     * will allow us to perform this transition. This
     * is required in order for hooks to work with
     * the ion-back-button or swipe to go back.
     */
    if (ti.opts && ti.opts.updateURL !== false && this.useRouter) {
      const router = document.querySelector('ion-router');
      if (router) {
        const canTransition = await router.canTransition();
        if (canTransition === false) {
          return false;
        }
        if (typeof canTransition === 'string') {
          router.push(canTransition, ti.opts.direction || 'back');
          return false;
        }
      }
    }
    // Normalize empty
    if (((_b = ti.insertViews) === null || _b === void 0 ? void 0 : _b.length) === 0) {
      ti.insertViews = undefined;
    }
    // Enqueue transition instruction
    this.transInstr.push(ti);
    // if there isn't a transition already happening
    // then this will kick off this transition
    this.nextTrns();
    return promise;
  }
  success(result, ti) {
    if (this.destroyed) {
      this.fireError('nav controller was destroyed', ti);
      return;
    }
    if (ti.done) {
      ti.done(result.hasCompleted, result.requiresTransition, result.enteringView, result.leavingView, result.direction);
    }
    ti.resolve(result.hasCompleted);
    if (ti.opts.updateURL !== false && this.useRouter) {
      const router = document.querySelector('ion-router');
      if (router) {
        const direction = result.direction === 'back' ? 'back' : 'forward';
        router.navChanged(direction);
      }
    }
  }
  failed(rejectReason, ti) {
    if (this.destroyed) {
      this.fireError('nav controller was destroyed', ti);
      return;
    }
    this.transInstr.length = 0;
    this.fireError(rejectReason, ti);
  }
  fireError(rejectReason, ti) {
    if (ti.done) {
      ti.done(false, false, rejectReason);
    }
    if (ti.reject && !this.destroyed) {
      ti.reject(rejectReason);
    }
    else {
      ti.resolve(false);
    }
  }
  /**
   * Consumes the next transition in the queue.
   *
   * @returns whether the transition is executed.
   */
  nextTrns() {
    // this is the framework's bread 'n butta function
    // only one transition is allowed at any given time
    if (this.isTransitioning) {
      return false;
    }
    // there is no transition happening right now, executes the next instructions.
    const ti = this.transInstr.shift();
    if (!ti) {
      return false;
    }
    this.runTransition(ti);
    return true;
  }
  /** Executes all the transition instruction from the queue. */
  async runTransition(ti) {
    try {
      // set that this nav is actively transitioning
      this.ionNavWillChange.emit();
      this.isTransitioning = true;
      this.prepareTI(ti);
      const leavingView = this.getActiveSync();
      const enteringView = this.getEnteringView(ti, leavingView);
      if (!leavingView && !enteringView) {
        throw new Error('no views in the stack to be removed');
      }
      if (enteringView && enteringView.state === VIEW_STATE_NEW) {
        await enteringView.init(this.el);
      }
      this.postViewInit(enteringView, leavingView, ti);
      // Needs transition?
      const requiresTransition = (ti.enteringRequiresTransition || ti.leavingRequiresTransition) && enteringView !== leavingView;
      if (requiresTransition && ti.opts && leavingView) {
        const isBackDirection = ti.opts.direction === 'back';
        /**
         * If heading back, use the entering page's animation
         * unless otherwise specified by the developer.
         */
        if (isBackDirection) {
          ti.opts.animationBuilder = ti.opts.animationBuilder || (enteringView === null || enteringView === void 0 ? void 0 : enteringView.animationBuilder);
        }
        leavingView.animationBuilder = ti.opts.animationBuilder;
      }
      let result;
      if (requiresTransition) {
        result = await this.transition(enteringView, leavingView, ti);
      }
      else {
        // transition is not required, so we are already done!
        // they're inserting/removing the views somewhere in the middle or
        // beginning, so visually nothing needs to animate/transition
        // resolve immediately because there's no animation that's happening
        result = {
          hasCompleted: true,
          requiresTransition: false,
        };
      }
      this.success(result, ti);
      this.ionNavDidChange.emit();
    }
    catch (rejectReason) {
      this.failed(rejectReason, ti);
    }
    this.isTransitioning = false;
    this.nextTrns();
  }
  prepareTI(ti) {
    var _a, _b;
    var _c;
    const viewsLength = this.views.length;
    (_a = ti.opts) !== null && _a !== void 0 ? _a : (ti.opts = {});
    (_b = (_c = ti.opts).delegate) !== null && _b !== void 0 ? _b : (_c.delegate = this.delegate);
    if (ti.removeView !== undefined) {
      assert(ti.removeStart !== undefined, 'removeView needs removeStart');
      assert(ti.removeCount !== undefined, 'removeView needs removeCount');
      const index = this.views.indexOf(ti.removeView);
      if (index < 0) {
        throw new Error('removeView was not found');
      }
      ti.removeStart += index;
    }
    if (ti.removeStart !== undefined) {
      if (ti.removeStart < 0) {
        ti.removeStart = viewsLength - 1;
      }
      if (ti.removeCount < 0) {
        ti.removeCount = viewsLength - ti.removeStart;
      }
      ti.leavingRequiresTransition = ti.removeCount > 0 && ti.removeStart + ti.removeCount === viewsLength;
    }
    if (ti.insertViews) {
      // allow -1 to be passed in to auto push it on the end
      // and clean up the index if it's larger then the size of the stack
      if (ti.insertStart < 0 || ti.insertStart > viewsLength) {
        ti.insertStart = viewsLength;
      }
      ti.enteringRequiresTransition = ti.insertStart === viewsLength;
    }
    const insertViews = ti.insertViews;
    if (!insertViews) {
      return;
    }
    assert(insertViews.length > 0, 'length can not be zero');
    const viewControllers = convertToViews(insertViews);
    if (viewControllers.length === 0) {
      throw new Error('invalid views to insert');
    }
    // Check all the inserted view are correct
    for (const view of viewControllers) {
      view.delegate = ti.opts.delegate;
      const nav = view.nav;
      if (nav && nav !== this) {
        throw new Error('inserted view was already inserted');
      }
      if (view.state === VIEW_STATE_DESTROYED) {
        throw new Error('inserted view was already destroyed');
      }
    }
    ti.insertViews = viewControllers;
  }
  /**
   * Returns the view that will be entered considering the transition instructions.
   *
   * @param ti The instructions.
   * @param leavingView The view being left or undefined if none.
   *
   * @returns The view that will be entered, undefined if none.
   */
  getEnteringView(ti, leavingView) {
    // The last inserted view will be entered when view are inserted.
    const insertViews = ti.insertViews;
    if (insertViews !== undefined) {
      return insertViews[insertViews.length - 1];
    }
    // When views are deleted, we will enter the last view that is not removed and not the view being left.
    const removeStart = ti.removeStart;
    if (removeStart !== undefined) {
      const views = this.views;
      const removeEnd = removeStart + ti.removeCount;
      for (let i = views.length - 1; i >= 0; i--) {
        const view = views[i];
        if ((i < removeStart || i >= removeEnd) && view !== leavingView) {
          return view;
        }
      }
    }
    return undefined;
  }
  /**
   * Adds and Removes the views from the navigation stack.
   *
   * @param enteringView The view being entered.
   * @param leavingView The view being left.
   * @param ti The instructions.
   */
  postViewInit(enteringView, leavingView, ti) {
    var _a, _b, _c;
    assert(leavingView || enteringView, 'Both leavingView and enteringView are null');
    assert(ti.resolve, 'resolve must be valid');
    assert(ti.reject, 'reject must be valid');
    // Compute the views to remove.
    const opts = ti.opts;
    const { insertViews, removeStart, removeCount } = ti;
    /** Records the view to destroy */
    let destroyQueue;
    // there are views to remove
    if (removeStart !== undefined && removeCount !== undefined) {
      assert(removeStart >= 0, 'removeStart can not be negative');
      assert(removeCount >= 0, 'removeCount can not be negative');
      destroyQueue = [];
      for (let i = removeStart; i < removeStart + removeCount; i++) {
        const view = this.views[i];
        if (view !== undefined && view !== enteringView && view !== leavingView) {
          destroyQueue.push(view);
        }
      }
      // default the direction to "back"
      (_a = opts.direction) !== null && _a !== void 0 ? _a : (opts.direction = 'back');
    }
    const finalNumViews = this.views.length + ((_b = insertViews === null || insertViews === void 0 ? void 0 : insertViews.length) !== null && _b !== void 0 ? _b : 0) - (removeCount !== null && removeCount !== void 0 ? removeCount : 0);
    assert(finalNumViews >= 0, 'final balance can not be negative');
    if (finalNumViews === 0) {
      console.warn(`You can't remove all the pages in the navigation stack. nav.pop() is probably called too many times.`, this, this.el);
      throw new Error('navigation stack needs at least one root page');
    }
    // At this point the transition can not be rejected, any throw should be an error
    // Insert the new views in the stack.
    if (insertViews) {
      // add the views to the
      let insertIndex = ti.insertStart;
      for (const view of insertViews) {
        this.insertViewAt(view, insertIndex);
        insertIndex++;
      }
      if (ti.enteringRequiresTransition) {
        // default to forward if not already set
        (_c = opts.direction) !== null && _c !== void 0 ? _c : (opts.direction = 'forward');
      }
    }
    // if the views to be removed are in the beginning or middle
    // and there is not a view that needs to visually transition out
    // then just destroy them and don't transition anything
    // batch all of lifecycles together
    // let's make sure, callbacks are zoned
    if (destroyQueue && destroyQueue.length > 0) {
      for (const view of destroyQueue) {
        lifecycle(view.element, LIFECYCLE_WILL_LEAVE);
        lifecycle(view.element, LIFECYCLE_DID_LEAVE);
        lifecycle(view.element, LIFECYCLE_WILL_UNLOAD);
      }
      // once all lifecycle events has been delivered, we can safely detroy the views
      for (const view of destroyQueue) {
        this.destroyView(view);
      }
    }
  }
  async transition(enteringView, leavingView, ti) {
    // we should animate (duration > 0) if the pushed page is not the first one (startup)
    // or if it is a portal (modal, actionsheet, etc.)
    const opts = ti.opts;
    const progressCallback = opts.progressAnimation ? (ani) => (this.sbAni = ani) : undefined;
    const mode = getIonMode(this);
    const enteringEl = enteringView.element;
    const leavingEl = leavingView && leavingView.element;
    const animationOpts = Object.assign(Object.assign({ mode, showGoBack: this.canGoBackSync(enteringView), baseEl: this.el, progressCallback, animated: this.animated && config.getBoolean('animated', true), enteringEl,
      leavingEl }, opts), { animationBuilder: opts.animationBuilder || this.animation || config.get('navAnimation') });
    const { hasCompleted } = await transition(animationOpts);
    return this.transitionFinish(hasCompleted, enteringView, leavingView, opts);
  }
  transitionFinish(hasCompleted, enteringView, leavingView, opts) {
    /**
     * If the transition did not complete, the leavingView will still be the active
     * view on the stack. Otherwise unmount all the views after the enteringView.
     */
    const activeView = hasCompleted ? enteringView : leavingView;
    if (activeView) {
      this.unmountInactiveViews(activeView);
    }
    return {
      hasCompleted,
      requiresTransition: true,
      enteringView,
      leavingView,
      direction: opts.direction,
    };
  }
  /**
   * Inserts a view at the specified index.
   *
   * When the view already is in the stack it will be moved to the new position.
   *
   * @param view The view to insert.
   * @param index The index where to insert the view.
   */
  insertViewAt(view, index) {
    const views = this.views;
    const existingIndex = views.indexOf(view);
    if (existingIndex > -1) {
      assert(view.nav === this, 'view is not part of the nav');
      // The view already in the stack, removes it.
      views.splice(existingIndex, 1);
      // and add it back at the requested index.
      views.splice(index, 0, view);
    }
    else {
      assert(!view.nav, 'nav is used');
      // this is a new view to add to the stack
      // create the new entering view
      view.nav = this;
      views.splice(index, 0, view);
    }
  }
  /**
   * Removes a view from the stack.
   *
   * @param view The view to remove.
   */
  removeView(view) {
    assert(view.state === VIEW_STATE_ATTACHED || view.state === VIEW_STATE_DESTROYED, 'view state should be loaded or destroyed');
    const views = this.views;
    const index = views.indexOf(view);
    assert(index > -1, 'view must be part of the stack');
    if (index >= 0) {
      views.splice(index, 1);
    }
  }
  destroyView(view) {
    view._destroy();
    this.removeView(view);
  }
  /**
   * Unmounts all inactive views after the specified active view.
   *
   * DOM WRITE
   *
   * @param activeView The view that is actively visible in the stack. Used to calculate which views to unmount.
   */
  unmountInactiveViews(activeView) {
    // ok, cleanup time!! Destroy all of the views that are
    // INACTIVE and come after the active view
    // only do this if the views exist, though
    if (this.destroyed) {
      return;
    }
    const views = this.views;
    const activeViewIndex = views.indexOf(activeView);
    for (let i = views.length - 1; i >= 0; i--) {
      const view = views[i];
      /**
       * When inserting multiple views via insertPages
       * the last page will be transitioned to, but the
       * others will not be. As a result, a DOM element
       * will only be created for the last page inserted.
       * As a result, it is possible to have views in the
       * stack that do not have `view.element` yet.
       */
      const element = view.element;
      if (element) {
        if (i > activeViewIndex) {
          // this view comes after the active view
          // let's unload it
          lifecycle(element, LIFECYCLE_WILL_UNLOAD);
          this.destroyView(view);
        }
        else if (i < activeViewIndex) {
          // this view comes before the active view
          // and it is not a portal then ensure it is hidden
          setPageHidden(element, true);
        }
      }
    }
  }
  canStart() {
    return (!!this.swipeGesture &&
      !this.isTransitioning &&
      this.transInstr.length === 0 &&
      this.animationEnabled &&
      this.canGoBackSync());
  }
  onStart() {
    this.pop({ direction: 'back', progressAnimation: true });
  }
  onMove(stepValue) {
    if (this.sbAni) {
      this.sbAni.progressStep(stepValue);
    }
  }
  onEnd(shouldComplete, stepValue, dur) {
    if (this.sbAni) {
      this.animationEnabled = false;
      this.sbAni.onFinish(() => {
        this.animationEnabled = true;
      }, { oneTimeCallback: true });
      // Account for rounding errors in JS
      let newStepValue = shouldComplete ? -0.001 : 0.001;
      /**
       * Animation will be reversed here, so need to
       * reverse the easing curve as well
       *
       * Additionally, we need to account for the time relative
       * to the new easing curve, as `stepValue` is going to be given
       * in terms of a linear curve.
       */
      if (!shouldComplete) {
        this.sbAni.easing('cubic-bezier(1, 0, 0.68, 0.28)');
        newStepValue += getTimeGivenProgression([0, 0], [1, 0], [0.68, 0.28], [1, 1], stepValue)[0];
      }
      else {
        newStepValue += getTimeGivenProgression([0, 0], [0.32, 0.72], [0, 1], [1, 1], stepValue)[0];
      }
      this.sbAni.progressEnd(shouldComplete ? 1 : 0, newStepValue, dur);
    }
  }
  render() {
    return h("slot", null);
  }
  get el() { return this; }
  static get watchers() { return {
    "swipeGesture": ["swipeGestureChanged"],
    "root": ["rootChanged"]
  }; }
  static get style() { return navCss; }
}, [1, "ion-nav", {
    "delegate": [16],
    "swipeGesture": [1028, "swipe-gesture"],
    "animated": [4],
    "animation": [16],
    "rootParams": [16],
    "root": [1],
    "push": [64],
    "insert": [64],
    "insertPages": [64],
    "pop": [64],
    "popTo": [64],
    "popToRoot": [64],
    "removeIndex": [64],
    "setRoot": [64],
    "setPages": [64],
    "setRouteId": [64],
    "getRouteId": [64],
    "getActive": [64],
    "getByIndex": [64],
    "canGoBack": [64],
    "getPrevious": [64]
  }]);
function defineCustomElement$1() {
  if (typeof customElements === "undefined") {
    return;
  }
  const components = ["ion-nav"];
  components.forEach(tagName => { switch (tagName) {
    case "ion-nav":
      if (!customElements.get(tagName)) {
        customElements.define(tagName, Nav);
      }
      break;
  } });
}

const IonNav = Nav;
const defineCustomElement = defineCustomElement$1;

export { IonNav, defineCustomElement };