import { expect, fixture, html } from '@open-wc/testing';
import sinon from 'sinon';

import '../lion-accordion.js';

const basicAccordion = html`
  <lion-accordion>
    <h2 slot="invoker"><button>invoker 1</button></h2>
    <div slot="content">content 1</div>
    <h2 slot="invoker"><button>invoker 2</button></h2>
    <div slot="content">content 2</div>
    <h2 slot="invoker"><button>invoker 3</button></h2>
    <div slot="content">content 3</div>
  </lion-accordion>
`;

describe('<lion-accordion>', () => {
  describe('Accordion', () => {
    it('sets expanded to [] by default', async () => {
      const el = await fixture(basicAccordion);
      expect(el.expanded).to.deep.equal([]);
    });

    it('can programmatically set expanded', async () => {
      const el = await fixture(html`
        <lion-accordion .expanded=${[1]}>
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
        </lion-accordion>
      `);
      expect(el.expanded).to.deep.equal([1]);
      expect(
        Array.from(el.children).find(
          child => child.slot === 'invoker' && child.hasAttribute('expanded'),
        ).textContent,
      ).to.equal('invoker 2');

      el.expanded = [0];
      expect(
        Array.from(el.children).find(
          child => child.slot === 'invoker' && child.hasAttribute('expanded'),
        ).textContent,
      ).to.equal('invoker 1');
    });

    it('has [expanded] on current expanded invoker which serves as styling hook', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      el.expanded = [0];
      expect(invokers[0]).to.have.attribute('expanded');
      expect(invokers[1]).to.not.have.attribute('expanded');

      el.expanded = [1];
      expect(invokers[0]).to.not.have.attribute('expanded');
      expect(invokers[1]).to.have.attribute('expanded');
    });

    it('has [expanded] on current expanded invoker first child which serves as styling hook', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      el.expanded = [0];
      expect(invokers[0].firstElementChild).to.have.attribute('expanded');
      expect(invokers[1].firstElementChild).to.not.have.attribute('expanded');

      el.expanded = [1];
      expect(invokers[0].firstElementChild).to.not.have.attribute('expanded');
      expect(invokers[1].firstElementChild).to.have.attribute('expanded');
    });

    it('sends event "expanded-changed" for every expanded state change', async () => {
      const el = await fixture(basicAccordion);
      const spy = sinon.spy();
      el.addEventListener('expanded-changed', spy);
      el.expanded = [1];
      expect(spy).to.have.been.calledOnce;
    });

    it('throws warning if unequal amount of invokers and contents', async () => {
      const spy = sinon.spy(console, 'warn');
      await fixture(html`
        <lion-accordion>
          <h2 slot="invoker"><button>invoker</button></h2>
          <div slot="content">content 1</div>
          <div slot="content">content 2</div>
        </lion-accordion>
      `);
      expect(spy.callCount).to.equal(1);
      console.warn.restore();
    });
  });

  describe('Accordion navigation', () => {
    it('sets focusedIndex to null by default', async () => {
      const el = await fixture(basicAccordion);
      expect(el.focusedIndex).to.be.null;
    });

    it('can programmatically set focusedIndex', async () => {
      const el = await fixture(html`
        <lion-accordion .focusedIndex=${1}>
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
        </lion-accordion>
      `);
      expect(el.focusedIndex).to.equal(1);
      expect(
        Array.from(el.children).find(
          child => child.slot === 'invoker' && child.firstElementChild.hasAttribute('focused'),
        ).textContent,
      ).to.equal('invoker 2');

      el.focusedIndex = 0;
      expect(
        Array.from(el.children).find(
          child => child.slot === 'invoker' && child.firstElementChild.hasAttribute('focused'),
        ).textContent,
      ).to.equal('invoker 1');
    });

    it('has [focused] on current focused invoker first child which serves as styling hook', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      el.focusedIndex = [0];
      expect(invokers[0]).to.not.have.attribute('focused');
      expect(invokers[1]).to.not.have.attribute('focused');
      expect(invokers[0].firstElementChild).to.have.attribute('focused');
      expect(invokers[1].firstElementChild).to.not.have.attribute('focused');

      el.focusedIndex = [1];
      expect(invokers[0]).to.not.have.attribute('focused');
      expect(invokers[1]).to.not.have.attribute('focused');
      expect(invokers[0].firstElementChild).to.not.have.attribute('focused');
      expect(invokers[1].firstElementChild).to.have.attribute('focused');
    });

    it('sends event "focused-changed" for every focused state change', async () => {
      const el = await fixture(basicAccordion);
      const spy = sinon.spy();
      el.addEventListener('focused-changed', spy);
      el.focusedIndex = 1;
      expect(spy).to.have.been.calledOnce;
    });
  });

  describe('Accordion Contents (slot=content)', () => {
    it('are visible when corresponding invoker is expanded', async () => {
      const el = await fixture(basicAccordion);
      const contents = el.querySelectorAll('[slot=content]');
      el.expanded = [0];
      expect(contents[0]).to.be.visible;
      expect(contents[1]).to.be.not.visible;

      el.expanded = [1];
      expect(contents[0]).to.be.not.visible;
      expect(contents[1]).to.be.visible;
    });

    it.skip('have a DOM structure that allows them to be animated ', async () => {});
  });

  /**
   * We will immediately switch content as all our content comes from light dom.
   *
   * See Note at https://www.w3.org/TR/wai-aria-practices/#keyboard-interaction-19
   * > It is recommended that invokers activate automatically when they receive focus as long as their
   * > associated invoker contents are displayed without noticeable latency. This typically requires invoker
   * > content content to be preloaded.
   */
  describe('User interaction', () => {
    it('opens a invoker on click', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[1].firstElementChild.dispatchEvent(new Event('click'));
      expect(el.expanded).to.deep.equal([1]);
    });

    it('selects a invoker on click', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[1].firstElementChild.dispatchEvent(new Event('click'));
      expect(el.focusedIndex).to.equal(1);
    });

    it.skip('opens/close invoker on [enter] and [space]', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[0].firstElementChild.dispatchEvent(new KeyboardEvent('keyup', { key: 'Enter' }));
      expect(el.expanded).to.deep.equal([0]);
      invokers[0].firstElementChild.dispatchEvent(new KeyboardEvent('keyup', { key: ' ' }));
      expect(el.expanded).to.deep.equal([]);
    });

    it('selects next invoker on [arrow-right] and [arrow-down]', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      el.focusedIndex = 0;
      invokers[0].firstElementChild.dispatchEvent(
        new KeyboardEvent('keydown', { key: 'ArrowRight' }),
      );
      expect(el.focusedIndex).to.equal(1);
      invokers[0].firstElementChild.dispatchEvent(
        new KeyboardEvent('keydown', { key: 'ArrowDown' }),
      );
      expect(el.focusedIndex).to.equal(2);
    });

    it('selects previous invoker on [arrow-left] and [arrow-up]', async () => {
      const el = await fixture(html`
        <lion-accordion .focusedIndex=${1}>
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
          <h2 slot="invoker"><button>invoker 3</button></h2>
          <div slot="content">content 3</div>
        </lion-accordion>
      `);
      const invokers = el.querySelectorAll('[slot=invoker]');
      el.focusedIndex = 2;
      invokers[2].firstElementChild.dispatchEvent(
        new KeyboardEvent('keydown', { key: 'ArrowLeft' }),
      );
      expect(el.focusedIndex).to.equal(1);
      invokers[1].firstElementChild.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowUp' }));
      expect(el.focusedIndex).to.equal(0);
    });

    it('selects first invoker on [home]', async () => {
      const el = await fixture(html`
        <lion-accordion .focusedIndex=${1}>
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
        </lion-accordion>
      `);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[1].firstElementChild.dispatchEvent(new KeyboardEvent('keydown', { key: 'Home' }));
      expect(el.focusedIndex).to.equal(0);
    });

    it('selects last invoker on [end]', async () => {
      const el = await fixture(basicAccordion);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[0].firstElementChild.dispatchEvent(new KeyboardEvent('keydown', { key: 'End' }));
      expect(el.focusedIndex).to.equal(2);
    });

    it('stays on last invoker on [arrow-right]', async () => {
      const el = await fixture(html`
        <lion-accordion focusedIndex="2">
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
          <h2 slot="invoker"><button>invoker 3</button></h2>
          <div slot="content">content 3</div>
        </lion-accordion>
      `);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[2].firstElementChild.dispatchEvent(
        new KeyboardEvent('keydown', { key: 'ArrowRight' }),
      );
      expect(el.focusedIndex).to.equal(2);
    });

    it('stays on first invoker on [arrow-left]', async () => {
      const el = await fixture(html`
        <lion-accordion>
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
          <h2 slot="invoker"><button>invoker 3</button></h2>
          <div slot="content">content 3</div>
        </lion-accordion>
      `);
      const invokers = el.querySelectorAll('[slot=invoker]');
      invokers[0].firstElementChild.dispatchEvent(
        new KeyboardEvent('keydown', { key: 'ArrowLeft' }),
      );
      expect(el.focusedIndex).to.equal(null);
    });
  });

  describe('Content distribution', () => {
    it('should work with append children', async () => {
      const el = await fixture(basicAccordion);
      const c = 2;
      const n = el.children.length / 2;
      for (let i = n + 1; i < n + c + 1; i += 1) {
        const invoker = document.createElement('h2');
        const button = document.createElement('button');
        invoker.setAttribute('slot', 'invoker');
        button.innerText = `invoker ${i}`;
        invoker.appendChild(button);
        const content = document.createElement('div');
        content.setAttribute('slot', 'content');
        content.innerText = `content ${i}`;
        el.append(invoker);
        el.append(content);
      }
      el.expanded = [el.children.length / 2 - 1];
      await el.updateComplete;
      expect(
        Array.from(el.children).find(
          child => child.slot === 'invoker' && child.hasAttribute('expanded'),
        ).textContent,
      ).to.equal('invoker 5');
      expect(
        Array.from(el.children).find(
          child => child.slot === 'content' && child.hasAttribute('expanded'),
        ).textContent,
      ).to.equal('content 5');
    });

    it('should add order style property to each invoker and content', async () => {
      const el = await fixture(basicAccordion);
      const c = 2;
      const n = el.children.length / 2;
      for (let i = n + 1; i < n + c + 1; i += 1) {
        const invoker = document.createElement('h2');
        const button = document.createElement('button');
        invoker.setAttribute('slot', 'invoker');
        button.innerText = `invoker ${i}`;
        invoker.appendChild(button);
        const content = document.createElement('div');
        content.setAttribute('slot', 'content');
        content.innerText = `content ${i}`;
        el.append(invoker);
        el.append(content);
      }
      el.expanded = [el.children.length / 2 - 1];
      await el.updateComplete;
      const invokers = el.querySelectorAll('[slot=invoker]');
      const contents = el.querySelectorAll('[slot=content]');
      invokers.forEach((invoker, index) => {
        const content = contents[index];
        expect(invoker.style.getPropertyValue('order')).to.equal(`${index + 1}`);
        expect(content.style.getPropertyValue('order')).to.equal(`${index + 1}`);
      });
    });
  });

  describe('Accessibility', () => {
    it('does not make contents focusable', async () => {
      const el = await fixture(html`
        <lion-accordion>
          <h2 slot="invoker"><button>invoker 1</button></h2>
          <div slot="content">content 1</div>
          <h2 slot="invoker"><button>invoker 2</button></h2>
          <div slot="content">content 2</div>
        </lion-accordion>
      `);
      expect(Array.from(el.children).find(child => child.slot === 'content')).to.not.have.attribute(
        'tabindex',
      );
      expect(Array.from(el.children).find(child => child.slot === 'content')).to.not.have.attribute(
        'tabindex',
      );
    });

    describe('Invokers', () => {
      it('links ids of content items to invoker first child via [aria-controls]', async () => {
        const el = await fixture(html`
          <lion-accordion>
            <h2 id="h1" slot="invoker"><button>invoker 1</button></h2>
            <div id="p1" slot="content">content 1</div>
            <h2 id="h2" slot="invoker"><button>invoker 2</button></h2>
            <div id="p2" slot="content">content 2</div>
          </lion-accordion>
        `);
        const invokers = el.querySelectorAll('[slot=invoker]');
        const contents = el.querySelectorAll('[slot=content]');
        expect(invokers[0].firstElementChild.getAttribute('aria-controls')).to.equal(
          contents[0].id,
        );
        expect(invokers[1].firstElementChild.getAttribute('aria-controls')).to.equal(
          contents[1].id,
        );
      });

      it('adds aria-expanded="false" to invoker when its content is not expanded', async () => {
        const el = await fixture(html`
          <lion-accordion>
            <h2 slot="invoker"><button>invoker</button></h2>
            <div slot="content">content</div>
          </lion-accordion>
        `);
        expect(
          Array.from(el.children).find(child => child.slot === 'invoker').firstElementChild,
        ).to.have.attribute('aria-expanded', 'false');
      });

      it('adds aria-expanded="true" to invoker when its content is expanded', async () => {
        const el = await fixture(html`
          <lion-accordion>
            <h2 slot="invoker"><button>invoker</button></h2>
            <div slot="content">content</div>
          </lion-accordion>
        `);
        el.expanded = [0];
        expect(
          Array.from(el.children).find(child => child.slot === 'invoker').firstElementChild,
        ).to.have.attribute('aria-expanded', 'true');
      });
    });

    describe('Contents', () => {
      it('adds aria-labelledby referring to invoker ids', async () => {
        const el = await fixture(html`
          <lion-accordion>
            <h2 slot="invoker"><button>invoker 1</button></h2>
            <div slot="content">content 1</div>
            <h2 slot="invoker"><button>invoker 2</button></h2>
            <div slot="content">content 2</div>
          </lion-accordion>
        `);
        const contents = el.querySelectorAll('[slot=content]');
        const invokers = el.querySelectorAll('[slot=invoker]');
        expect(contents[0]).to.have.attribute('aria-labelledby', invokers[0].firstElementChild.id);
        expect(contents[1]).to.have.attribute('aria-labelledby', invokers[1].firstElementChild.id);
      });
    });
  });
});