import { Assertions, Chain, Logger, Pipeline, RawAssertions } from '@ephox/agar';
import { Fun } from '@ephox/katamari';
import { Hierarchy, Remove, Element, Traverse, Selection, WindowSelection } from '@ephox/sugar';
import SelectionBookmark from 'tinymce/core/selection/SelectionBookmark';
import ViewBlock from '../../module/test/ViewBlock';
import { UnitTest } from '@ephox/bedrock';

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

  const viewBlock = ViewBlock();

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

  const cSetSelection = function (startPath, soffset, finishPath, foffset) {
    return Chain.op(function () {
      const sc = Hierarchy.follow(Element.fromDom(viewBlock.get()), startPath).getOrDie('invalid startPath');
      const fc = Hierarchy.follow(Element.fromDom(viewBlock.get()), finishPath).getOrDie('invalid finishPath');
      const win = Traverse.defaultView(sc);

      WindowSelection.setExact(
        win.dom(), sc, soffset, fc, foffset
      );
    });
  };

  const cGetBookmark = function (rootPath) {
    return Chain.mapper(function () {
      const root = Hierarchy.follow(Element.fromDom(viewBlock.get()), rootPath).getOrDie();
      return SelectionBookmark.getBookmark(root);
    });
  };

  const cValidateBookmark = function (rootPath) {
    return Chain.on(function (input, next, die) {
      const root = Hierarchy.follow(Element.fromDom(viewBlock.get()), rootPath).getOrDie();

      return input.each(function (b) {
        return next(Chain.wrap(SelectionBookmark.validate(root, b)));
      });
    });
  };

  const cAssertNone = Chain.op(function (x) {
    RawAssertions.assertEq('should be none', true, x.isNone());
  });

  const cAssertSome = Chain.op(function (x) {
    RawAssertions.assertEq('should be some', true, x.isSome());
  });

  const cAssertSelection = function (startPath, startOffset, finishPath, finishOffset) {
    return Chain.op(function () {
      const sc = Hierarchy.follow(Element.fromDom(viewBlock.get()), startPath).getOrDie();
      const fc = Hierarchy.follow(Element.fromDom(viewBlock.get()), finishPath).getOrDie();

      const win = Traverse.defaultView(Element.fromDom(viewBlock.get()));

      const sel = WindowSelection.getExact(win.dom()).getOrDie('no selection');

      Assertions.assertDomEq('sc', sc, sel.start());
      Assertions.assertEq('soffset', startOffset, sel.soffset());
      Assertions.assertDomEq('fc', fc, sel.finish());
      Assertions.assertEq('foffset', finishOffset, sel.foffset());
    });
  };

  const cManipulateBookmarkOffsets = function (startPad, finishPad) {
    return Chain.mapper(function (bookmark) {
      return bookmark
        .map(function (bm) {
          return Selection.range(bm.start(), bm.soffset() + startPad, bm.finish(), bm.foffset() + finishPad);
        });
    });
  };

  const cDeleteElement = function (path) {
    return Chain.op(function () {
      Hierarchy.follow(Element.fromDom(viewBlock.get()), path).each(Remove.remove);
    });
  };

  const cAssertBookmark = function (startPath, startOffset, finishPath, finishOffset) {
    return Chain.op(function (input) {
      const sc = Hierarchy.follow(Element.fromDom(viewBlock.get()), startPath).getOrDie();
      const fc = Hierarchy.follow(Element.fromDom(viewBlock.get()), finishPath).getOrDie();

      const bookmarkRng = input.getOrDie('no bookmark!');

      Assertions.assertDomEq('sc', sc, bookmarkRng.start());
      Assertions.assertEq('soffset', startOffset, bookmarkRng.soffset());
      Assertions.assertDomEq('fc', fc, bookmarkRng.finish());
      Assertions.assertEq('foffset', finishOffset, bookmarkRng.foffset());
    });
  };

  const cSetSelectionFromBookmark = Chain.op(function (bookmark) {
    bookmark.each(function (b) {
      const root = Element.fromDom(viewBlock.get());
      const win = Traverse.defaultView(root);

      SelectionBookmark.validate(root, b)
        .each(function (rng) {
          WindowSelection.setExact(win.dom(), rng.start(), rng.soffset(), rng.finish(), rng.foffset());
        });
    });
  });

  viewBlock.attach();
  Pipeline.async({}, [
    Logger.t('attached element returns some', Chain.asStep(viewBlock, [
      cSetHtml('hello'),
      cSetSelection([0], 0, [0], 1),
      cGetBookmark([]),
      cAssertSome,
      cSetSelectionFromBookmark,
      cAssertSelection([0], 0, [0], 1)
    ])),
    Logger.t('foffset too big', Chain.asStep(viewBlock, [
      cSetHtml('hello'),
      cSetSelection([0], 0, [0], 3),
      cGetBookmark([]),
      cManipulateBookmarkOffsets(0, 10),
      cSetSelectionFromBookmark,
      cAssertSelection([0], 0, [0], 5)
    ])),
    Logger.t('soffset too small', Chain.asStep(viewBlock, [
      cSetHtml('hello'),
      cSetSelection([0], 0, [0], 3),
      cGetBookmark([]),
      cManipulateBookmarkOffsets(-2, 5),
      cSetSelectionFromBookmark,
      cAssertSelection([0], 0, [0], 5)
    ])),
    Logger.t('both offsets too small', Chain.asStep(viewBlock, [
      cSetHtml('hello'),
      cSetSelection([0], 0, [0], 3),
      cGetBookmark([]),
      cManipulateBookmarkOffsets(-2, -5),
      cSetSelectionFromBookmark,
      cAssertSelection([0], 0, [0], 0)
    ])),
    Logger.t('both offsets too small', Chain.asStep(viewBlock, [
      cSetHtml('hello'),
      cSetSelection([0], 0, [0], 3),
      cGetBookmark([]),
      cManipulateBookmarkOffsets(6, 6),
      cSetSelectionFromBookmark,
      cAssertSelection([0], 5, [0], 5)
    ])),
    Logger.t('two p tags offsets too big', Chain.asStep(viewBlock, [
      cSetHtml('<p>abc</p><p>123</p>'),
      cSetSelection([0, 0], 0, [1, 0], 1),
      cGetBookmark([]),
      cAssertSome,
      cManipulateBookmarkOffsets(4, 4),
      cSetSelectionFromBookmark,
      cAssertSelection([0, 0], 3, [1, 0], 3)
    ])),
    Logger.t('two p tags, delete one and should be none', Chain.asStep(viewBlock, [
      cSetHtml('<p>abc</p><p>123</p>'),
      cSetSelection([0, 0], 0, [1, 0], 1),
      cGetBookmark([]),
      cAssertSome,
      cDeleteElement([0]),
      cValidateBookmark([]),
      cAssertNone
    ])),
    Logger.t('three p tags, delete middle and should be none', Chain.asStep(viewBlock, [
      cSetHtml('<p>abc</p><p>xyz</p><p>123</p>'),
      cSetSelection([0, 0], 0, [2, 0], 1),
      cGetBookmark([]),
      cAssertSome,
      cDeleteElement([1]),
      cValidateBookmark([]),
      cSetSelectionFromBookmark,
      cAssertSelection([0, 0], 0, [1, 0], 1)
    ])),
    Logger.t('backwards selection should set a non-backwards bookmark, one p tag', Chain.asStep(viewBlock, [
      cSetHtml('<p>hello</p>'),
      cSetSelection([0, 0], 5, [0, 0], 0),
      cGetBookmark([]),
      cAssertSome,
      cValidateBookmark([]),
      cAssertBookmark([0, 0], 0, [0, 0], 5)
    ])),
    Logger.t('backwards selection should set a non-backwards bookmark, two p tags', Chain.asStep(viewBlock, [
      cSetHtml('<p>hello</p><p>world</p>'),
      cSetSelection([1, 0], 3, [0, 0], 2),
      cGetBookmark([]),
      cAssertSome,
      cValidateBookmark([]),
      cAssertBookmark([0, 0], 2, [1, 0], 3)
    ])),
    Logger.t('readRange with with win without getSelection should return Option.none', Chain.asStep({}, [
      Chain.mapper(function () {
        const mockWin = { getSelection: Fun.constant(null) };
        return SelectionBookmark.readRange(mockWin);
      }),
      cAssertNone
    ]))
  ], function () {
    viewBlock.detach();
    success();
  }, failure);
});