import { find, findAll, render } from '@ember/test-helpers';
import { module, test } from 'qunit';
import { setupRenderingTest } from 'ember-qunit';
import hbs from 'htmlbars-inline-precompile';
import flat from 'flat';

const { flatten } = flat;

module('Integration | Component | attributes table', function(hooks) {
  setupRenderingTest(hooks);

  const commonAttributes = {
    key: 'value',
    nested: {
      props: 'are',
      supported: 'just',
      fine: null,
    },
    so: {
      are: {
        deeply: {
          nested: 'properties',
          like: 'these ones',
        },
      },
    },
  };

  test('should render a row for each key/value pair in a deep object', async function(assert) {
    this.set('attributes', commonAttributes);
    await render(hbs`<AttributesTable @attributes={{attributes}} />`);

    const rowsCount = Object.keys(flatten(commonAttributes)).length;
    assert.equal(
      this.element.querySelectorAll('[data-test-attributes-section] [data-test-value]').length,
      rowsCount,
      `Table has ${rowsCount} rows with values`
    );
  });

  test('should render the full path of key/value pair from the root of the object', async function(assert) {
    this.set('attributes', commonAttributes);
    await render(hbs`<AttributesTable @attributes={{attributes}} />`);

    assert.equal(find('[data-test-key]').textContent.trim(), 'key', 'Row renders the key');
    assert.equal(find('[data-test-value]').textContent.trim(), 'value', 'Row renders the value');

    const deepRow = findAll('[data-test-attributes-section]')[8];
    assert.equal(
      deepRow.querySelector('[data-test-key]').textContent.trim(),
      'so.are.deeply.nested',
      'Complex row renders the full path to the key'
    );
    assert.equal(
      deepRow.querySelector('[data-test-prefix]').textContent.trim(),
      'so.are.deeply.',
      'The prefix is faded to put emphasis on the attribute'
    );
    assert.equal(deepRow.querySelector('[data-test-value]').textContent.trim(), 'properties');
  });

  test('should render a row for key/value pairs even when the value is another object', async function(assert) {
    this.set('attributes', commonAttributes);
    await render(hbs`<AttributesTable @attributes={{attributes}} />`);

    const countOfParentRows = countOfParentKeys(commonAttributes);
    assert.equal(
      findAll('[data-test-heading]').length,
      countOfParentRows,
      'Each key for a nested object gets a row with no value'
    );
  });

  function countOfParentKeys(obj) {
    return Object.keys(obj).reduce((count, key) => {
      const value = obj[key];
      return isObject(value) ? count + 1 + countOfParentKeys(value) : count;
    }, 0);
  }

  function isObject(value) {
    return !Array.isArray(value) && value != null && typeof value === 'object';
  }
});