/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import {assert} from '@open-wc/testing';
import '../../../test/common-test-setup';
import {createElementDiff, formatText, createTabWrapper} from './gr-diff-utils';

const LINE_BREAK_HTML = '<span class="gr-diff br"></span>';

suite('gr-diff-utils tests', () => {
  test('createElementDiff classStr applies all classes', () => {
    const node = createElementDiff('div', 'test classes');
    assert.isTrue(node.classList.contains('gr-diff'));
    assert.isTrue(node.classList.contains('test'));
    assert.isTrue(node.classList.contains('classes'));
  });

  test('formatText newlines 1', () => {
    let text = 'abcdef';

    assert.equal(
      formatText(text, 'NONE', 4, 10, '').firstElementChild?.innerHTML,
      text
    );
    text = 'a'.repeat(20);
    assert.equal(
      formatText(text, 'NONE', 4, 10, '').firstElementChild?.innerHTML,
      'a'.repeat(10) + LINE_BREAK_HTML + 'a'.repeat(10)
    );
  });

  test('formatText newlines 2', () => {
    const text = '<span class="thumbsup">👍</span>';
    assert.equal(
      formatText(text, 'NONE', 4, 10, '').firstElementChild?.innerHTML,
      '&lt;span clas' +
        LINE_BREAK_HTML +
        's="thumbsu' +
        LINE_BREAK_HTML +
        'p"&gt;👍&lt;/span' +
        LINE_BREAK_HTML +
        '&gt;'
    );
  });

  test('formatText newlines 3', () => {
    const text = '01234\t56789';
    assert.equal(
      formatText(text, 'NONE', 4, 10, '').firstElementChild?.innerHTML,
      '01234' + createTabWrapper(3).outerHTML + '56' + LINE_BREAK_HTML + '789'
    );
  });

  test('formatText newlines 4', () => {
    const text = '👍'.repeat(58);
    assert.equal(
      formatText(text, 'NONE', 4, 20, '').firstElementChild?.innerHTML,
      '👍'.repeat(20) +
        LINE_BREAK_HTML +
        '👍'.repeat(20) +
        LINE_BREAK_HTML +
        '👍'.repeat(18)
    );
  });

  test('tab wrapper style', () => {
    const pattern = new RegExp(
      '^<span class="gr-diff tab" ' +
        'style="((?:-moz-)?tab-size: (\\d+);.?)+">\\t<\\/span>$'
    );

    for (const size of [1, 3, 8, 55]) {
      const html = createTabWrapper(size).outerHTML;
      assert.match(html, pattern);
      assert.equal(html.match(pattern)?.[2], size.toString());
    }
  });

  test('tab wrapper insertion', () => {
    const html = 'abc\tdef';
    const tabSize = 8;
    const wrapper = createTabWrapper(tabSize - 3);
    assert.ok(wrapper);
    assert.equal(wrapper.innerText, '\t');
    assert.equal(
      formatText(html, 'NONE', tabSize, Infinity, '').firstElementChild
        ?.innerHTML,
      'abc' + wrapper.outerHTML + 'def'
    );
  });

  test('escaping HTML', () => {
    let input = '<script>alert("XSS");<' + '/script>';
    let expected = '&lt;script&gt;alert("XSS");&lt;/script&gt;';

    let result = formatText(input, 'NONE', 1, Number.POSITIVE_INFINITY, '')
      .firstElementChild?.innerHTML;
    assert.equal(result, expected);

    input = '& < > " \' / `';
    expected = '&amp; &lt; &gt; " \' / `';
    result = formatText(input, 'NONE', 1, Number.POSITIVE_INFINITY, '')
      .firstElementChild?.innerHTML;
    assert.equal(result, expected);
  });

  test('text length with tabs and unicode', () => {
    function expectTextLength(text: string, tabSize: number, expected: number) {
      // Formatting to |expected| columns should not introduce line breaks.
      const result = formatText(text, 'NONE', tabSize, expected, '')
        .firstElementChild!;
      assert.isNotOk(
        result.querySelector('.contentText > .br'),
        '  Expected the result of: \n' +
          `      _formatText(${text}', 'NONE',  ${tabSize}, ${expected})\n` +
          '  to not contain a br. But the actual result HTML was:\n' +
          `      '${result.innerHTML}'\nwhereupon`
      );

      // Increasing the line limit should produce the same markup.
      assert.equal(
        formatText(text, 'NONE', tabSize, Infinity, '').firstElementChild
          ?.innerHTML,
        result.innerHTML
      );
      assert.equal(
        formatText(text, 'NONE', tabSize, expected + 1, '').firstElementChild
          ?.innerHTML,
        result.innerHTML
      );

      // Decreasing the line limit should introduce line breaks.
      if (expected > 0) {
        const tooSmall = formatText(text, 'NONE', tabSize, expected - 1, '')
          .firstElementChild!;
        assert.isOk(
          tooSmall.querySelector('.contentText .br'),
          '  Expected the result of: \n' +
            `      _formatText(${text}', ${tabSize}, ${expected - 1})\n` +
            '  to contain a br. But the actual result HTML was:\n' +
            `      '${tooSmall.innerHTML}'\nwhereupon`
        );
      }
    }
    expectTextLength('12345', 4, 5);
    expectTextLength('\t\t12', 4, 10);
    expectTextLength('abc💢123', 4, 7);
    expectTextLength('abc\t', 8, 8);
    expectTextLength('abc\t\t', 10, 20);
    expectTextLength('', 10, 0);
    // 17 Thai combining chars.
    expectTextLength('ก้้้้้้้้้้้้้้้้', 4, 17);
    expectTextLength('abc\tde', 10, 12);
    expectTextLength('abc\tde\t', 10, 20);
    expectTextLength('\t\t\t\t\t', 20, 100);
  });
});