/* eslint-env qunit */

import {NS} from '../editor/namespaces.js';
import * as utilities from '../editor/utilities.js';
import * as coords from '../editor/coords.js';
import * as recalculate from '../editor/recalculate.js';

// log function
QUnit.log((details) => {
  if (window.console && window.console.log) {
    window.console.log(details.result + ' :: ' + details.message);
  }
});

const root = document.getElementById('root');
const svgroot = document.createElementNS(NS.SVG, 'svg');
svgroot.id = 'svgroot';
root.append(svgroot);
const svg = document.createElementNS(NS.SVG, 'svg');
svgroot.append(svg);

let elemId = 1;

/**
 * Initilize modules to set up the tests.
 * @returns {undefined}
 */
function setUp () {
  utilities.init(
    /**
    * @implements {module:utilities.EditorContext}
    */
    {
      getSVGRoot () { return svg; },
      getDOMDocument () { return null; },
      getDOMContainer () { return null; }
    }
  );
  coords.init(
    /**
    * @implements {module:coords.EditorContext}
    */
    {
      getGridSnapping () { return false; },
      getDrawing () {
        return {
          getNextId () { return String(elemId++); }
        };
      }
    }
  );
  recalculate.init(
    /**
    * @implements {module:recalculate.EditorContext}
    */
    {
      getSVGRoot () { return svg; },
      getStartTransform () { return ''; },
      setStartTransform () { /* */ }
    }
  );
}

let elem;

/**
 * Initialize for tests and set up `rect` element.
 * @returns {undefined}
 */
function setUpRect () {
  setUp();
  elem = document.createElementNS(NS.SVG, 'rect');
  elem.setAttribute('x', '200');
  elem.setAttribute('y', '150');
  elem.setAttribute('width', '250');
  elem.setAttribute('height', '120');
  svg.append(elem);
}

/**
 * Initialize for tests and set up `text` element with `tspan` child.
 * @returns {undefined}
 */
function setUpTextWithTspan () {
  setUp();
  elem = document.createElementNS(NS.SVG, 'text');
  elem.setAttribute('x', '200');
  elem.setAttribute('y', '150');

  const tspan = document.createElementNS(NS.SVG, 'tspan');
  tspan.setAttribute('x', '200');
  tspan.setAttribute('y', '150');

  const theText = document.createTextNode('Foo bar');
  tspan.append(theText);
  elem.append(tspan);
  svg.append(elem);
}

/**
 * Tear down the tests (empty the svg element).
 * @returns {undefined}
 */
function tearDown () {
  while (svg.hasChildNodes()) {
    svg.firstChild.remove();
  }
}

QUnit.test('Test recalculateDimensions() on rect with identity matrix', function (assert) {
  assert.expect(1);

  setUpRect();
  elem.setAttribute('transform', 'matrix(1,0,0,1,0,0)');

  recalculate.recalculateDimensions(elem);

  // Ensure that the identity matrix is swallowed and the element has no
  // transform on it.
  assert.equal(elem.hasAttribute('transform'), false);

  tearDown();
});

QUnit.test('Test recalculateDimensions() on rect with simple translate', function (assert) {
  assert.expect(5);

  setUpRect();
  elem.setAttribute('transform', 'translate(100,50)');

  recalculate.recalculateDimensions(elem);

  assert.equal(elem.hasAttribute('transform'), false);
  assert.equal(elem.getAttribute('x'), '300');
  assert.equal(elem.getAttribute('y'), '200');
  assert.equal(elem.getAttribute('width'), '250');
  assert.equal(elem.getAttribute('height'), '120');
  tearDown();
});

QUnit.test('Test recalculateDimensions() on text w/tspan with simple translate', function (assert) {
  assert.expect(5);

  setUpTextWithTspan();
  elem.setAttribute('transform', 'translate(100,50)');

  recalculate.recalculateDimensions(elem);

  // Ensure that the identity matrix is swallowed and the element has no
  // transform on it.
  assert.equal(elem.hasAttribute('transform'), false);
  assert.equal(elem.getAttribute('x'), '300');
  assert.equal(elem.getAttribute('y'), '200');

  const tspan = elem.firstElementChild;
  assert.equal(tspan.getAttribute('x'), '300');
  assert.equal(tspan.getAttribute('y'), '200');

  tearDown();
});

// TODO: Since recalculateDimensions() and surrounding code is
// probably the largest, most complicated and strange piece of
// code in SVG-edit, we need to write a whole lot of unit tests
// for it here.