import { Assertions, Chain, GeneralSteps, Logger, Pipeline } from '@ephox/agar';
import { Hierarchy, Element } from '@ephox/sugar';
import CaretPosition from 'tinymce/core/caret/CaretPosition';
import DeleteUtils from 'tinymce/core/delete/DeleteUtils';
import ViewBlock from '../../module/test/ViewBlock';
import { UnitTest } from '@ephox/bedrock';

UnitTest.asynctest('browser.tinymce.core.delete.DeleteUtilsTest', function () {
  const success = arguments[arguments.length - 2];
  const failure = arguments[arguments.length - 1];
  const viewBlock = ViewBlock();

  const cSetHtml = function (html) {
    return Chain.op(function () {
      viewBlock.update(html);
    });
  };

  const cGetParentTextBlock = function (elementPath) {
    return Chain.mapper(function (viewBlock) {
      const element = Hierarchy.follow(Element.fromDom(viewBlock.get()), elementPath).getOrDie();
      return DeleteUtils.getParentBlock(Element.fromDom(viewBlock.get()), element);
    });
  };

  const cAssertBlock = function (elementPath) {
    return Chain.op(function (actualBlock) {
      const expectedBlock = Hierarchy.follow(Element.fromDom(viewBlock.get()), elementPath).getOrDie();
      Assertions.assertDomEq('Should be the expected block element', expectedBlock, actualBlock.getOrDie());
    });
  };

  const cWillDeleteLastPositionInElement = function (forward, caretPath, caretOffset, elementPath) {
    return Chain.mapper(function (actualBlock) {
      const element = Hierarchy.follow(Element.fromDom(viewBlock.get()), elementPath).getOrDie();
      const caretNode = Hierarchy.follow(Element.fromDom(viewBlock.get()), caretPath).getOrDie();

      return DeleteUtils.willDeleteLastPositionInElement(forward, CaretPosition(caretNode.dom(), caretOffset), element.dom());
    });
  };

  const cAssertNone = Chain.op(function (actualBlock) {
    Assertions.assertEq('Should be the none but got some', true, actualBlock.isNone());
  });

  viewBlock.attach();
  Pipeline.async({}, [
    Logger.t('getParentTextBlock', GeneralSteps.sequence([
      Logger.t('Should be the paragraph block', Chain.asStep(viewBlock, [
        cSetHtml('<p>a</p>'),
        cGetParentTextBlock([0, 0]),
        cAssertBlock([0])
      ])),
      Logger.t('Should be the paragraph block inside the div', Chain.asStep(viewBlock, [
        cSetHtml('<div><p>a</p></div>'),
        cGetParentTextBlock([0, 0, 0]),
        cAssertBlock([0, 0])
      ])),
      Logger.t('Should be none in inline elements', Chain.asStep(viewBlock, [
        cSetHtml('<span>a</span>'),
        cGetParentTextBlock([0, 0]),
        cAssertNone
      ])),
      Logger.t('Should be none text nodes', Chain.asStep(viewBlock, [
        cSetHtml('a'),
        cGetParentTextBlock([0]),
        cAssertNone
      ])),
      Logger.t('Should be none on root element', Chain.asStep(viewBlock, [
        cSetHtml(''),
        cGetParentTextBlock([]),
        cAssertNone
      ])),
      Logger.t('Will delete last position', GeneralSteps.sequence([
        Logger.t('Should delete element since caret is before last character', Chain.asStep(viewBlock, [
          cSetHtml('<p>a</p>'),
          cWillDeleteLastPositionInElement(true, [0, 0], 0, [0]),
          Assertions.cAssertEq('Should be true', true)
        ])),
        Logger.t('Should delete element since caret is after last character', Chain.asStep(viewBlock, [
          cSetHtml('<p>a</p>'),
          cWillDeleteLastPositionInElement(false, [0, 0], 1, [0]),
          Assertions.cAssertEq('Should be true', true)
        ])),
        Logger.t('Should not delete element since caret is after last character', Chain.asStep(viewBlock, [
          cSetHtml('<p>a</p>'),
          cWillDeleteLastPositionInElement(true, [0, 0], 1, [0]),
          Assertions.cAssertEq('Should be false', false)
        ])),
        Logger.t('Should not delete element since caret is before last character', Chain.asStep(viewBlock, [
          cSetHtml('<p>a</p>'),
          cWillDeleteLastPositionInElement(false, [0, 0], 0, [0]),
          Assertions.cAssertEq('Should be false', false)
        ])),
        Logger.t('Should not delete element since caret is not before last character', Chain.asStep(viewBlock, [
          cSetHtml('<p>ab</p>'),
          cWillDeleteLastPositionInElement(true, [0, 0], 1, [0]),
          Assertions.cAssertEq('Should be false', false)
        ])),
        Logger.t('Should not delete element since caret is not after last character', Chain.asStep(viewBlock, [
          cSetHtml('<p>ab</p>'),
          cWillDeleteLastPositionInElement(false, [0, 0], 1, [0]),
          Assertions.cAssertEq('Should be false', false)
        ])),
        Logger.t('Should delete element since the element is empty', Chain.asStep(viewBlock, [
          cSetHtml('<p></p>'),
          cWillDeleteLastPositionInElement(true, [0], 0, [0]),
          Assertions.cAssertEq('Should be false', true)
        ])),
        Logger.t('Should delete element since the element is empty', Chain.asStep(viewBlock, [
          cSetHtml('<p></p>'),
          cWillDeleteLastPositionInElement(false, [0], 0, [0]),
          Assertions.cAssertEq('Should be false', true)
        ]))
      ]))
    ]))
  ], function () {
    viewBlock.detach();
    success();
  }, failure);
});