<!DOCTYPE html>
<meta charset="utf-8">
<title>SVGTextContentElement.getRotationOfChar</title>
<link rel="help" href="https://svgwg.org/svg2-draft/text.html#__svg__SVGTextContentElement__getRotationOfChar">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg id="container" width="800" height="300"></svg>
<script>
function createSVGElement(localPart, attributes, textOrElement) {
  const element = document.createElementNS('http://www.w3.org/2000/svg', localPart);
  for (let name in attributes) {
    element.setAttribute(name, attributes[name]);
  }
  if (typeof(textOrElement) == 'string')
    element.textContent = textOrElement;
  else if (textOrElement instanceof Element)
    element.appendChild(textOrElement);
  else if (textOrElement !== undefined)
    throw new TypeError('The third argument should be a string or an Element');
  return element;
}

function normalize(rotation) {
  return rotation - 360 * Math.floor(rotation / 360);
}

function normalizedRotation(element, index) {
  return normalize(element.getRotationOfChar(index));
}

const container = document.querySelector('#container');
['horizontal-tb', 'vertical-rl', 'vertical-lr', 'sideways-rl', 'sideways-lr'].forEach(mode => {
  const isHorizontal = mode == 'horizontal-tb';
  const isVertical = mode == 'vertical-rl' || mode == 'vertical-lr';
  const sidewaysDelta = 90 * ((mode == 'sideways-rl') - (mode == 'sideways-lr'));
  container.style.writingMode = mode;

  test(() => {
    container.style.textOrientation = 'mixed';
    const element = container.appendChild(createSVGElement('text', {}, '  M月X'));
    assert_equals(element.getRotationOfChar(0), isVertical ? 90 : sidewaysDelta, 'M');
    assert_equals(element.getRotationOfChar(1), sidewaysDelta, '月');
    assert_equals(element.getRotationOfChar(2), isVertical ? 90 : sidewaysDelta, 'X');
  }, `'text-orientation: mixed' - ${mode}`);

  test(() => {
    container.style.textOrientation = 'upright';
    const element = container.appendChild(createSVGElement('text', {}, 'T火'));
    assert_equals(element.getRotationOfChar(0), sidewaysDelta, 'T');
    assert_equals(element.getRotationOfChar(1), sidewaysDelta, '火');
  }, `'text-orientation: upright' - ${mode}`);

  test(() => {
    container.style.textOrientation = 'sideways';
    const element = container.appendChild(createSVGElement('text', {}, 'W水'));
    assert_equals(element.getRotationOfChar(0), isVertical ? 90 : sidewaysDelta, 'W');
    assert_equals(element.getRotationOfChar(1), isVertical ? 90 : sidewaysDelta, '水');
  }, `'text-orientation: sideways' - ${mode}`);

  test(() => {
    container.style.textOrientation = 'mixed';
    const element = container.appendChild(
        createSVGElement('text', {rotate: '0 180.5 360 365 -10'}, 't木cde'));
    const shift = isHorizontal ? 0 : 90 * (mode == 'sideways-rl' || isVertical) + 270 * (mode == 'sideways-lr');
    assert_equals(normalizedRotation(element, 0), 0 + shift, 't');
    assert_equals(normalizedRotation(element, 1), 180.5 + sidewaysDelta, '木');
    assert_equals(normalizedRotation(element, 2), 0 + shift, 'c');
    assert_equals(normalizedRotation(element, 3), 5 + shift, 'd');
    assert_equals(normalizedRotation(element, 4), normalize(350 + shift), 'e');
  }, `Rotation attribute - ${mode}`);

  test(() => {
    container.style.textOrientation = 'mixed';
    container.appendChild(createSVGElement('path', {id: 'path1', d: 'M 40 40 L 200 200'}));
    const element = container.appendChild(
        createSVGElement('text', {rotate: '0 0 25'},
            createSVGElement('textPath', {href: '#path1'}, 'F金r')));
    const shift = (mode == 'sideways-lr') ? 180 : 0;
    assert_equals(normalizedRotation(element, 0), 45 + shift, 'F');
    assert_equals(normalizedRotation(element, 1), isVertical ? 315 : 45 + shift, '金');
    assert_equals(normalizedRotation(element, 2), 45 + 25 + shift, 'r');
  }, `<textPath> - ${mode}`);
});
</script>
