import { expect, fixture, html, nextFrame } from '@open-wc/testing';
import sinon from 'sinon';
import { overlays } from '../src/overlays.js';

export function runOverlayMixinSuite({ /* tagString, */ tag, suffix = '' }) {
  describe(`OverlayMixin${suffix}`, () => {
    let el;

    beforeEach(async () => {
      el = await fixture(html`
        <${tag}>
          <div slot="content">content of the overlay</div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);
    });

    it('should not be opened by default', async () => {
      expect(el.opened).to.be.false;
      expect(el._overlayCtrl.isShown).to.be.false;
    });

    it('syncs opened to overlayController', async () => {
      el.opened = true;
      expect(el.opened).to.be.true;
      await nextFrame(); // overlayCtrl show/hide is async
      expect(el._overlayCtrl.isShown).to.be.true;

      el.opened = false;
      expect(el.opened).to.be.false;
      await nextFrame(); // overlayCtrl show/hide is async
      expect(el._overlayCtrl.isShown).to.be.false;
    });

    it('syncs overlayController to opened', async () => {
      expect(el.opened).to.be.false;
      await el._overlayCtrl.show();
      expect(el.opened).to.be.true;

      await el._overlayCtrl.hide();
      expect(el.opened).to.be.false;
    });

    it('should respond to initially and dynamically setting the config', async () => {
      const itEl = await fixture(html`
          <${tag} .config=${{ trapsKeyboardFocus: false, viewportConfig: { placement: 'top' } }}>
            <div slot="content">content of the overlay</div>
            <button slot="invoker">invoker button</button>
          </${tag}>
        `);
      itEl.opened = true;
      await itEl.updateComplete;
      expect(itEl._overlayCtrl.trapsKeyboardFocus).to.be.false;

      itEl.config = { viewportConfig: { placement: 'left' } };
      expect(itEl._overlayCtrl.viewportConfig.placement).to.equal('left');
    });

    it('fires "opened-changed" event on hide', async () => {
      const spy = sinon.spy();
      el = await fixture(html`
        <${tag} @opened-changed="${spy}">
          <div slot="content">content of the overlay</div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);
      expect(spy).not.to.have.been.called;
      await el._overlayCtrl.show();
      expect(spy.callCount).to.equal(1);
      expect(el.opened).to.be.true;
      await el._overlayCtrl.hide();
      expect(spy.callCount).to.equal(2);
      expect(el.opened).to.be.false;
    });

    it('fires "before-closed" event on hide', async () => {
      const beforeSpy = sinon.spy();
      el = await fixture(html`
        <${tag} @before-closed="${beforeSpy}" .opened="${true}">
          <div slot="content">content of the overlay</div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);
      // Wait until it's done opening (handling features is async)
      await nextFrame();
      expect(beforeSpy).not.to.have.been.called;
      await el._overlayCtrl.hide();
      expect(beforeSpy).to.have.been.called;
      expect(el.opened).to.be.false;
    });

    it('fires before-opened" event on show', async () => {
      const beforeSpy = sinon.spy();
      el = await fixture(html`
        <${tag} @before-opened="${beforeSpy}">
          <div slot="content">content of the overlay</div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);
      expect(beforeSpy).not.to.have.been.called;
      await el._overlayCtrl.show();
      expect(beforeSpy).to.have.been.called;
      expect(el.opened).to.be.true;
    });

    it('allows to call `preventDefault()` on "before-opened"/"before-closed" events', async () => {
      function preventer(ev) {
        ev.preventDefault();
      }
      el = await fixture(html`
        <${tag} @before-opened="${preventer}" @before-closed="${preventer}">
          <div slot="content">content of the overlay</div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);
      await el._overlayCtrl.show();
      expect(el.opened).to.be.false;
    });

    it('hides content on "close-overlay" event within the content ', async () => {
      function sendCloseEvent(e) {
        e.target.dispatchEvent(new Event('close-overlay', { bubbles: true }));
      }
      const closeBtn = await fixture(html`
        <button @click=${sendCloseEvent}>
          close
        </button>
      `);

      el = await fixture(html`
        <${tag} opened>
          <div slot="content">
            content of the overlay
            ${closeBtn}
          </div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);
      closeBtn.click();
      expect(el.opened).to.be.false;
    });
  });

  describe(`OverlayMixin${suffix} nested`, () => {
    it('reconstructs the overlay when disconnected and reconnected to DOM (support for nested overlay nodes)', async () => {
      const nestedEl = await fixture(html`
        <${tag}>
          <div slot="content">content of the nested overlay</div>
          <button slot="invoker">invoker nested</button>
        </${tag}>
      `);

      const mainEl = await fixture(html`
        <${tag}>
          <div slot="content">
            open nested overlay:
            ${nestedEl}
          </div>
          <button slot="invoker">invoker button</button>
        </${tag}>
      `);

      if (mainEl._overlayCtrl.placementMode === 'global') {
        // Specifically checking the output in global root node, because the _contentOverlayNode still references
        // the node that was removed in the teardown but hasn't been garbage collected due to reference to it still existing..

        // Find the outlets that are not backdrop outlets
        const outletsInGlobalRootNode = Array.from(overlays.globalRootNode.children).filter(
          child =>
            child.slot === '_overlay-shadow-outlet' &&
            !child.classList.contains('global-overlays__backdrop'),
        );

        // Check the last one, which is the most nested one
        const lastContentNodeInContainer =
          outletsInGlobalRootNode[outletsInGlobalRootNode.length - 1];
        expect(outletsInGlobalRootNode.length).to.equal(2);

        // Check that it indeed has the intended content
        expect(lastContentNodeInContainer.firstElementChild.innerText).to.equal(
          'content of the nested overlay',
        );
        expect(lastContentNodeInContainer.firstElementChild.slot).to.equal('content');
      } else {
        const actualNestedOverlay = mainEl._overlayContentNode.firstElementChild;
        const outletNode = Array.from(actualNestedOverlay.children).find(
          child => child.slot === '_overlay-shadow-outlet',
        );
        const contentNode = Array.from(outletNode.children).find(child => child.slot === 'content');

        expect(contentNode).to.not.be.undefined;
        expect(contentNode.innerText).to.equal('content of the nested overlay');
      }
    });
  });
}