/*!
 * Jodit Editor (https://xdsoft.net/jodit/)
 * Licensed under GNU General Public License version 2 or later or a commercial license or MIT;
 * For GPL see LICENSE-GPL.txt in the project root for license information.
 * For MIT see LICENSE-MIT.txt in the project root for license information.
 * For commercial licenses see https://xdsoft.net/jodit/commercial/
 * Copyright (c) 2013-2019 Valeriy Chupurnov. All rights reserved. https://xdsoft.net
 */

import * as consts from '../constants';
import {
	INVISIBLE_SPACE,
	INVISIBLE_SPACE_REG_EXP_END,
	INVISIBLE_SPACE_REG_EXP_START
} from '../constants';

import { HTMLTagNames, IDictionary, IJodit, markerInfo } from '../types';
import { Dom } from './Dom';
import { css } from './helpers/css';
import { normalizeNode, normilizeCSSValue } from './helpers/normalize';
import { $$ } from './helpers/selector';
import { isPlainObject } from './helpers/checker';
import { each } from './helpers/each';
import { trim } from './helpers/string';

type WindowSelection = Selection | null;

export class Select {
	constructor(readonly jodit: IJodit) {
	}

	/**
	 * Throw Error exception if parameter is not Node
	 * @param node
	 */
	private errorNode(node: unknown) {
		if (!Dom.isNode(node, this.win)) {
			throw new Error('Parameter node must be instance of Node');
		}
	}

	/**
	 * Return current work place - for Jodit is Editor
	 */
	get area(): HTMLElement {
		return this.jodit.editor;
	}

	/**
	 * Editor Window - it can be different for iframe mode
	 */
	get win(): Window {
		return this.jodit.editorWindow;
	}

	/**
	 * Current jodit editor doc
	 */
	get doc(): Document {
		return this.jodit.editorDocument;
	}

	/**
	 * Return current selection object
	 */
	get sel(): WindowSelection {
		return this.win.getSelection();
	}

	/**
	 * Return first selected range or create new
	 */
	get range(): Range {
		const sel = this.sel;

		return sel && sel.rangeCount ? sel.getRangeAt(0) : this.createRange();
	}

	/**
	 * Return current selection object
	 */
	createRange(): Range {
		return this.doc.createRange();
	}

	/**
	 * Remove all selected content
	 */
	remove() {
		const
			sel = this.sel,
			current: false | Node = this.current();

		if (sel && current) {
			for (let i = 0; i < sel.rangeCount; i += 1) {
				sel.getRangeAt(i).deleteContents();
				sel.getRangeAt(i).collapse(true);
			}
		}
	}

	/**
	 * Insert the cursor toWYSIWYG any point x, y
	 *
	 * @method insertAtPoint
	 * @param {int} x Coordinate by horizontal
	 * @param {int} y Coordinate by vertical
	 * @return boolean Something went wrong
	 */
	insertCursorAtPoint(x: number, y: number): boolean {
		this.removeMarkers();

		try {
			let rng: Range = this.createRange();

			if ((this.doc as any).caretPositionFromPoint) {
				const caret: CaretPosition = (this
					.doc as any).caretPositionFromPoint(x, y);
				rng.setStart(caret.offsetNode, caret.offset);
			} else if (this.doc.caretRangeFromPoint) {
				const caret: Range = this.doc.caretRangeFromPoint(x, y);
				rng.setStart(caret.startContainer, caret.startOffset);
			}

			if (rng) {
				rng.collapse(true);
				const sel = this.sel;

				if (sel) {
					sel.removeAllRanges();
					sel.addRange(rng);
				}
			} else if (
				typeof (this.doc as any).body.createTextRange !== 'undefined'
			) {
				const range: any = (this.doc as any).body.createTextRange();
				range.moveToPoint(x, y);
				const endRange: any = range.duplicate();
				endRange.moveToPoint(x, y);
				range.setEndPoint('EndToEnd', endRange);
				range.select();
			}

			return true;
		} catch {
		}

		return false;
	}

	/**
	 * Define element is selection helper
	 * @param elm
	 */
	isMarker = (elm: Node): boolean =>
		Dom.isNode(elm, this.win) &&
		elm.nodeType === Node.ELEMENT_NODE &&
		elm.nodeName === 'SPAN' &&
		(elm as Element).hasAttribute('data-' + consts.MARKER_CLASS);

	/**
	 * Remove all markers
	 */
	removeMarkers() {
		$$('span[data-' + consts.MARKER_CLASS + ']', this.area).forEach(
			Dom.safeRemove
		);
	}

	/**
	 * Create marker element
	 *
	 * @param atStart
	 * @param range
	 */
	marker(atStart = false, range?: Range): HTMLSpanElement {
		let newRange: Range | null = null;

		if (range) {
			newRange = range.cloneRange();
			newRange.collapse(atStart);
		}

		const marker: HTMLSpanElement = this.jodit.create.inside.span();

		marker.id =
			consts.MARKER_CLASS +
			'_' +
			+new Date() +
			'_' +
			('' + Math.random()).slice(2);

		marker.style.lineHeight = '0';
		marker.style.display = 'none';

		marker.setAttribute(
			'data-' + consts.MARKER_CLASS,
			atStart ? 'start' : 'end'
		);

		marker.appendChild(
			this.jodit.create.inside.text(consts.INVISIBLE_SPACE)
		);

		if (newRange) {
			if (
				Dom.isOrContains(
					this.area,
					atStart ? newRange.startContainer : newRange.endContainer
				)
			) {
				newRange.insertNode(marker);
			}
		}

		return marker;
	}

	/**
	 * Restores user selections using marker invisible elements in the DOM.
	 *
	 * @param {markerInfo[]|null} selectionInfo
	 */
	restore(selectionInfo: markerInfo[] | null = []) {
		if (Array.isArray(selectionInfo)) {
			const sel = this.sel;
			sel && sel.removeAllRanges();

			selectionInfo.forEach((selection: markerInfo) => {
				const
					range = this.createRange(),
					end = this.area.querySelector(
						'#' + selection.endId
					) as HTMLElement,
					start = this.area.querySelector(
						'#' + selection.startId
					) as HTMLElement;

				if (!start) {
					return;
				}

				if (selection.collapsed || !end) {
					const previousNode: Node | null = start.previousSibling;

					if (
						previousNode &&
						previousNode.nodeType === Node.TEXT_NODE
					) {
						range.setStart(
							previousNode,
							previousNode.nodeValue
								? previousNode.nodeValue.length
								: 0
						);
					} else {
						range.setStartBefore(start);
					}

					Dom.safeRemove(start);

					range.collapse(true);
				} else {
					range.setStartAfter(start);
					Dom.safeRemove(start);

					range.setEndBefore(end);
					Dom.safeRemove(end);
				}

				sel && sel.addRange(range);
			});
		}
	}

	/**
	 * Saves selections using marker invisible elements in the DOM.
	 *
	 * @return markerInfo[]
	 */
	save(): markerInfo[] {
		const sel = this.sel;

		if (!sel || !sel.rangeCount) {
			return [];
		}

		const info: markerInfo[] = [],
			length: number = sel.rangeCount,
			ranges: Range[] = [];

		let i: number, start: HTMLSpanElement, end: HTMLSpanElement;

		for (i = 0; i < length; i += 1) {
			ranges[i] = sel.getRangeAt(i);
			if (ranges[i].collapsed) {
				start = this.marker(true, ranges[i]);

				info[i] = {
					startId: start.id,
					collapsed: true,
					startMarker: start.outerHTML
				};
			} else {
				start = this.marker(true, ranges[i]);
				end = this.marker(false, ranges[i]);
				info[i] = {
					startId: start.id,
					endId: end.id,
					collapsed: false,
					startMarker: start.outerHTML,
					endMarker: end.outerHTML
				};
			}
		}

		sel.removeAllRanges();

		for (i = length - 1; i >= 0; --i) {
			const startElm: HTMLElement | null = this.doc.getElementById(
				info[i].startId
			);

			if (startElm) {
				if (info[i].collapsed) {
					ranges[i].setStartAfter(startElm);
					ranges[i].collapse(true);
				} else {
					ranges[i].setStartBefore(startElm);
					if (info[i].endId) {
						const endElm: HTMLElement | null = this.doc.getElementById(
							info[i].endId as string
						);
						if (endElm) {
							ranges[i].setEndAfter(endElm);
						}
					}
				}
			}

			try {
				sel.addRange(ranges[i].cloneRange());
			} catch {
			}
		}

		return info;
	}

	/**
	 * Set focus in editor
	 */
	focus = (): boolean => {
		if (!this.isFocused()) {
			if (this.jodit.iframe) {
				if (this.doc.readyState == 'complete') {
					this.jodit.iframe.focus();
				}
			}

			this.win.focus();
			this.area.focus();

			const
				sel = this.sel,
				range = this.createRange();

			if (sel && (!sel.rangeCount || !this.current())) {
				range.setStart(this.area, 0);
				range.collapse(true);
				sel.removeAllRanges();
				sel.addRange(range);
			}

			return true;
		}

		return false;
	};

	/**
	 * Checks whether the current selection is something or just set the cursor is
	 *
	 * @return boolean true Selection does't have content
	 */
	isCollapsed(): boolean {
		const sel = this.sel;

		for (let r: number = 0; sel && r < sel.rangeCount; r += 1) {
			if (!sel.getRangeAt(r).collapsed) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Checks whether the editor currently in focus
	 *
	 * @return boolean
	 */
	isFocused(): boolean {
		return (
			this.doc.hasFocus &&
			this.doc.hasFocus() &&
			this.area === this.doc.activeElement
		);
	}

	/**
	 * Returns the current element under the cursor inside editor
	 *
	 * @return false|Node The element under the cursor or false if undefined or not in editor
	 */
	current(checkChild: boolean = true): false | Node {
		if (this.jodit.getRealMode() === consts.MODE_WYSIWYG) {
			const sel = this.sel;

			if (sel && sel.rangeCount > 0) {
				const range = sel.getRangeAt(0);

				let
					node: Node | null = range.startContainer,
					rightMode: boolean = false;

				const child = (nd: Node): Node | null =>
					rightMode ? nd.lastChild : nd.firstChild;

				if (node.nodeType !== Node.TEXT_NODE) {
					node = range.startContainer.childNodes[range.startOffset];

					if (!node) {
						node =
							range.startContainer.childNodes[
							range.startOffset - 1
								];
						rightMode = true;
					}

					if (
						node &&
						sel.isCollapsed &&
						node.nodeType !== Node.TEXT_NODE
					) {
						// test Current method - Cursor in the left of some SPAN
						if (
							!rightMode &&
							node.previousSibling &&
							node.previousSibling.nodeType === Node.TEXT_NODE
						) {
							node = node.previousSibling;
						} else if (checkChild) {
							let current: Node | null = child(node);
							while (current) {
								if (
									current &&
									current.nodeType === Node.TEXT_NODE
								) {
									node = current;
									break;
								}
								current = child(current);
							}
						}
					}

					if (
						node &&
						!sel.isCollapsed &&
						node.nodeType !== Node.TEXT_NODE
					) {
						let leftChild: Node | null = node,
							rightChild: Node | null = node;

						do {
							leftChild = leftChild.firstChild;
							rightChild = rightChild.lastChild;
						} while (
							leftChild &&
							rightChild &&
							leftChild.nodeType !== Node.TEXT_NODE
							);

						if (
							leftChild === rightChild &&
							leftChild &&
							leftChild.nodeType === Node.TEXT_NODE
						) {
							node = leftChild;
						}
					}
				}

				// check - cursor inside editor
				if (node && Dom.isOrContains(this.area, node)) {
					return node;
				}
			}
		}

		return false;
	}

	/**
	 * Insert element in editor
	 *
	 * @param {Node} node
	 * @param {Boolean} [insertCursorAfter=true] After insert, cursor will move after element
	 * @param {Boolean} [fireChange=true] After insert, editor fire change event. You can prevent this behavior
	 */
	insertNode(
		node: Node,
		insertCursorAfter = true,
		fireChange: boolean = true
	) {
		this.errorNode(node);

		this.focus();

		const sel = this.sel;

		if (!this.isCollapsed()) {
			this.jodit.execCommand('Delete');
		}

		if (sel && sel.rangeCount) {
			const range = sel.getRangeAt(0);

			if (Dom.isOrContains(this.area, range.commonAncestorContainer)) {
				range.deleteContents();
				range.insertNode(node);
			} else {
				this.area.appendChild(node);
			}

		} else {
			this.area.appendChild(node);
		}

		if (insertCursorAfter) {
			this.setCursorAfter(node);
		}

		if (fireChange && this.jodit.events) {
			this.jodit.events.fire('synchro');
		}

		if (this.jodit.events) {
			this.jodit.events.fire('afterInsertNode', node);
		}
	}

	/**
	 * Inserts in the current cursor position some HTML snippet
	 *
	 * @param  {string} html HTML The text toWYSIWYG be inserted into the document
	 * @example
	 * ```javascript
	 * parent.selection.insertHTML('<img src="image.png"/>');
	 * ```
	 */
	insertHTML(html: number | string | Node) {
		if (html === '') {
			return;
		}

		const
			node = this.jodit.create.inside.div(),
			fragment = this.jodit.create.inside.fragment();

		let lastChild: Node | null, lastEditorElement: Node | null;

		if (!this.isFocused() && this.jodit.isEditorMode()) {
			this.focus();
		}

		if (!Dom.isNode(html, this.win)) {
			node.innerHTML = html.toString();
		} else {
			node.appendChild(html);
		}

		if (
			!this.jodit.isEditorMode() &&
			this.jodit.events.fire('insertHTML', node.innerHTML) === false
		) {
			return;
		}

		lastChild = node.lastChild;

		if (!lastChild) {
			return;
		}

		while (node.firstChild) {
			lastChild = node.firstChild;
			fragment.appendChild(node.firstChild);
		}

		this.insertNode(fragment, false);

		if (lastChild) {
			this.setCursorAfter(lastChild);
		} else {
			this.setCursorIn(fragment);
		}

		lastEditorElement = this.area.lastChild;

		while (
			lastEditorElement &&
			lastEditorElement.nodeType === Node.TEXT_NODE &&
			lastEditorElement.previousSibling &&
			lastEditorElement.nodeValue &&
			/^\s*$/.test(lastEditorElement.nodeValue)
			) {
			lastEditorElement = lastEditorElement.previousSibling;
		}

		if (lastChild) {
			if (
				lastEditorElement &&
				lastChild === lastEditorElement &&
				lastChild.nodeType === Node.ELEMENT_NODE
			) {
				this.area.appendChild(this.jodit.create.inside.element('br'));
			}
			this.setCursorAfter(lastChild);
		}
	}

	/**
	 * Insert image in editor
	 *
	 * @param  {string|HTMLImageElement} url URL for image, or HTMLImageElement
	 * @param  {string} [styles] If specified, it will be applied <code>$(image).css(styles)</code>
	 * @param { number | string | null } defaultWidth
	 *
	 * @fired afterInsertImage
	 */
	insertImage(
		url: string | HTMLImageElement,
		styles: IDictionary<string> | null,
		defaultWidth: number | string | null
	) {
		const image: HTMLImageElement =
			typeof url === 'string'
				? this.jodit.create.inside.element('img')
				: url;

		if (typeof url === 'string') {
			image.setAttribute('src', url);
		}

		if (defaultWidth !== null) {
			let dw: string = defaultWidth.toString();
			if (
				dw &&
				'auto' !== dw &&
				String(dw).indexOf('px') < 0 &&
				String(dw).indexOf('%') < 0
			) {
				dw += 'px';
			}

			css(image, 'width', dw);
		}

		if (styles && typeof styles === 'object') {
			css(image, styles);
		}

		const onload = () => {
			if (
				image.naturalHeight < image.offsetHeight ||
				image.naturalWidth < image.offsetWidth
			) {
				image.style.width = '';
				image.style.height = '';
			}
			image.removeEventListener('load', onload);
		};

		image.addEventListener('load', onload);

		if (image.complete) {
			onload();
		}

		const result = this.insertNode(image);

		/**
		 * Triggered after image was inserted {@link Selection~insertImage|insertImage}. This method can executed from
		 * {@link FileBrowser|FileBrowser} or {@link Uploader|Uploader}
		 * @event afterInsertImage
		 * @param {HTMLImageElement} image
		 * @example
		 * ```javascript
		 * var editor = new Jodit("#redactor");
		 * editor.events.on('afterInsertImage', function (image) {
		 *     image.className = 'bloghead4';
		 * });
		 * ```
		 */
		this.jodit.events.fire('afterInsertImage', image);

		return result;
	}

	eachSelection = (callback: (current: Node) => void) => {
		const sel = this.sel;

		if (sel && sel.rangeCount) {
			const range = sel.getRangeAt(0);

			const
				nodes: Node[] = [],
				startOffset: number = range.startOffset,
				length: number = this.area.childNodes.length,
				start: Node =
					range.startContainer === this.area
						? this.area.childNodes[
							startOffset < length ? startOffset : length - 1
							]
						: range.startContainer,
				end: Node =
					range.endContainer === this.area
						? this.area.childNodes[range.endOffset - 1]
						: range.endContainer;

			Dom.find(
				start,
				(node: Node | null) => {
					if (
						node &&
						node !== this.area &&
						!Dom.isEmptyTextNode(node) &&
						!this.isMarker(node as HTMLElement)
					) {
						nodes.push(node);
					}

					// checks parentElement as well because partial selections are not equal to entire element
					return node === end || (node && node.contains(end));
				},
				this.area,
				true,
				'nextSibling',
				false
			);

			const forEvery = (current: Node): void => {
				if (current.nodeName.match(/^(UL|OL)$/)) {
					return Array.from(current.childNodes).forEach(forEvery);
				}

				if (current.nodeName === 'LI') {
					if (current.firstChild) {
						current = current.firstChild;
					} else {
						const currentB = this.jodit.create.inside.text(
							INVISIBLE_SPACE
						);
						current.appendChild(currentB);
						current = currentB;
					}
				}

				callback(current);
			};

			if (nodes.length === 0 && Dom.isEmptyTextNode(start)) {
				nodes.push(start);
			}

			nodes.forEach(forEvery);
		}
	};

	/**
	 * Set cursor after the node
	 *
	 * @param {Node} node
	 * @return {Node} fake invisible textnode. After insert it can be removed
	 */
	setCursorAfter(
		node: Node | HTMLElement | HTMLTableElement | HTMLTableCellElement
	): Text | false {
		this.errorNode(node);

		if (
			!Dom.up(
				node,
				(elm: Node | null) =>
					elm === this.area || (elm && elm.parentNode === this.area),
				this.area
			)
		) {
			throw new Error('Node element must be in editor');
		}

		const range = this.createRange();
		let fakeNode: Text | false = false;

		if (node.nodeType !== Node.TEXT_NODE) {
			fakeNode = this.doc.createTextNode(consts.INVISIBLE_SPACE);
			range.setStartAfter(node);
			range.insertNode(fakeNode);
			range.selectNode(fakeNode);
		} else {
			range.setEnd(
				node,
				node.nodeValue !== null ? node.nodeValue.length : 0
			);
		}

		range.collapse(false);

		this.selectRange(range);

		return fakeNode;
	}

	/**
	 * Checks if the cursor is at the end(start) block
	 *
	 * @param  {boolean} start=false true - check whether the cursor is at the start block
	 * @param {HTMLElement} parentBlock - Find in this
	 *
	 * @return {boolean | null} true - the cursor is at the end(start) block, null - cursor somewhere outside
	 */
	cursorInTheEdge(start: boolean, parentBlock: HTMLElement): boolean | null {
		const
			sel = this.sel,
			range: Range | null =
				sel && sel.rangeCount ? sel.getRangeAt(0) : null;

		if (!range) {
			return null;
		}

		const container = start ? range.startContainer : range.endContainer,
			sibling = (node: Node): Node | false => {
				return start
					? Dom.prev(node, elm => !!elm, parentBlock)
					: Dom.next(node, elm => !!elm, parentBlock);
			},
			checkSiblings = (next: Node | false): false | void => {
				while (next) {
					next = sibling(next);
					if (
						next &&
						!Dom.isEmptyTextNode(next) &&
						next.nodeName !== 'BR'
					) {
						return false;
					}
				}
			};

		if (container.nodeType === Node.TEXT_NODE) {
			const value: string = container.nodeValue || '';
			if (
				start &&
				range.startOffset >
				value.length -
				value.replace(INVISIBLE_SPACE_REG_EXP_START, '').length
			) {
				return false;
			}
			if (
				!start &&
				range.startOffset <
				value.replace(INVISIBLE_SPACE_REG_EXP_END, '').length
			) {
				return false;
			}

			if (checkSiblings(container) === false) {
				return false;
			}
		}

		const current: Node | false = this.current(false);
		if (!current || !Dom.isOrContains(parentBlock, current, true)) {
			return null;
		}

		if (!start && range.startContainer.childNodes[range.startOffset]) {
			if (current && !Dom.isEmptyTextNode(current)) {
				return false;
			}
		}

		return checkSiblings(current) !== false;
	}

	/**
	 * Set cursor before the node
	 *
	 * @param {Node} node
	 * @return {Text} fake invisible textnode. After insert it can be removed
	 */
	setCursorBefore(
		node: Node | HTMLElement | HTMLTableElement | HTMLTableCellElement
	): Text | false {
		this.errorNode(node);

		if (
			!Dom.up(
				node,
				(elm: Node | null) =>
					elm === this.area || (elm && elm.parentNode === this.area),
				this.area
			)
		) {
			throw new Error('Node element must be in editor');
		}

		const range = this.createRange();
		let fakeNode: Text | false = false;

		if (node.nodeType !== Node.TEXT_NODE) {
			fakeNode = this.doc.createTextNode(consts.INVISIBLE_SPACE);
			range.setStartBefore(node);
			range.collapse(true);
			range.insertNode(fakeNode);
			range.selectNode(fakeNode);
		} else {
			range.setStart(
				node,
				node.nodeValue !== null ? node.nodeValue.length : 0
			);
		}

		range.collapse(true);
		this.selectRange(range);

		return fakeNode;
	}

	/**
	 * Set cursor in the node
	 *
	 * @param {Node} node
	 * @param {boolean} [inStart=false] set cursor in start of element
	 */
	setCursorIn(node: Node, inStart: boolean = false) {
		this.errorNode(node);

		if (
			!Dom.up(
				node,
				(elm: Node | null) =>
					elm === this.area || (elm && elm.parentNode === this.area),
				this.area
			)
		) {
			throw new Error('Node element must be in editor');
		}

		const range = this.createRange();

		let start: Node | null = node,
			last: Node = node;

		do {
			if (start.nodeType === Node.TEXT_NODE) {
				break;
			}
			last = start;
			start = inStart ? start.firstChild : start.lastChild;
		} while (start);

		if (!start) {
			const fakeNode: Text = this.doc.createTextNode(
				consts.INVISIBLE_SPACE
			);
			if (!/^(img|br|input)$/i.test(last.nodeName)) {
				last.appendChild(fakeNode);
				last = fakeNode;
			} else {
				start = last;
			}
		}

		range.selectNodeContents(start || last);
		range.collapse(inStart);

		this.selectRange(range);

		return last;
	}

	/**
	 * Set range selection
	 *
	 * @param range
	 *
	 * @fires changeSelection
	 */
	selectRange(range: Range) {
		const sel = this.sel;

		if (sel) {
			sel.removeAllRanges();
			sel.addRange(range);
		}

		/**
		 * Fired after change selection
		 *
		 * @event changeSelection
		 */
		this.jodit.events.fire('changeSelection');
	}

	/**
	 * Select node
	 *
	 * @param {Node} node
	 * @param {boolean} [inward=false] select all inside
	 */
	select(
		node: Node | HTMLElement | HTMLTableElement | HTMLTableCellElement,
		inward = false
	) {
		this.errorNode(node);

		if (
			!Dom.up(
				node,
				(elm: Node | null) =>
					elm === this.area || (elm && elm.parentNode === this.area),
				this.area
			)
		) {
			throw new Error('Node element must be in editor');
		}

		const range = this.createRange();

		range[inward ? 'selectNodeContents' : 'selectNode'](node);

		this.selectRange(range);
	}

	/**
	 * Return current selected HTML
	 */
	getHTML(): string {
		const sel = this.sel;

		if (sel && sel.rangeCount > 0) {
			const range = sel.getRangeAt(0);
			const clonedSelection = range.cloneContents();
			const div = this.jodit.create.inside.div();

			div.appendChild(clonedSelection);

			return div.innerHTML;
		}

		return '';
	}

	/**
	 * Apply some css rules for all selections. It method wraps selections in nodeName tag.
	 *
	 * @param {object} cssRules
	 * @param {string} nodeName
	 * @param {object} options
	 */
	applyCSS(
		cssRules: IDictionary<string | number | undefined>,
		nodeName: HTMLTagNames = 'span',
		options?:
			| ((jodit: IJodit, elm: HTMLElement) => boolean)
			| IDictionary<string | string[]>
			| IDictionary<(editor: IJodit, elm: HTMLElement) => boolean>
	) {
		const
			WRAP = 1,
			UNWRAP = 0,
			defaultTag = 'SPAN',
			FONT = 'FONT';

		let mode: number;

		const findNextCondition = (elm: Node | null): boolean =>
			elm !== null &&
			!Dom.isEmptyTextNode(elm) &&
			!this.isMarker(elm as HTMLElement);

		const checkCssRulesFor = (elm: HTMLElement): boolean => {
			return (
				elm.nodeName !== FONT &&
				elm.nodeType === Node.ELEMENT_NODE &&
				((isPlainObject(options) &&
					each(
						options as IDictionary<string[]>,
						(cssPropertyKey, cssPropertyValues) => {
							const value = css(
								elm,
								cssPropertyKey,
								undefined,
								true
							);

							return (
								value !== null &&
								value !== '' &&
								cssPropertyValues.indexOf(
									value.toString().toLowerCase()
								) !== -1
							);
						}
					)) ||
					(typeof options === 'function' && options(this.jodit, elm)))
			);
		};

		const isSuitElement = (elm: Node | null): boolean | null => {
			if (!elm) {
				return false;
			}

			const reg: RegExp = new RegExp('^' + elm.nodeName + '$', 'i');

			return (
				(reg.test(nodeName) ||
					!!(options && checkCssRulesFor(elm as HTMLElement))) &&
				findNextCondition(elm)
			);
		};

		const toggleStyles = (elm: HTMLElement) => {
			if (isSuitElement(elm)) {
				// toggle CSS rules
				if (elm.nodeName === defaultTag && cssRules) {
					// TODO need check == and ===
					Object.keys(cssRules).forEach((rule: string) => {
						if (
							mode === UNWRAP ||
							css(elm, rule) ===
							normilizeCSSValue(rule, cssRules[
								rule
								] as string)
						) {
							css(elm, rule, '');
							if (mode === undefined) {
								mode = UNWRAP;
							}
						} else {
							css(elm, rule, cssRules[rule]);
							if (mode === undefined) {
								mode = WRAP;
							}
						}
					});
				}

				if (
					!Dom.isBlock(elm, this.win) &&
					(!elm.getAttribute('style') || elm.nodeName !== defaultTag)
				) {
					// toggle `<strong>test</strong>` toWYSIWYG `test`, and
					// `<span style="">test</span>` toWYSIWYG `test`
					Dom.unwrap(elm);

					if (mode === undefined) {
						mode = UNWRAP;
					}
				}
			}
		};

		if (!this.isCollapsed()) {
			const selInfo: markerInfo[] = this.save();
			normalizeNode(this.area.firstChild); // FF fix for test "commandsTest - Exec command "bold"
			// for some text that contains a few STRONG elements, should unwrap all of these"

			// fix issue https://github.com/xdan/jodit/issues/65
			$$('*[style*=font-size]', this.area).forEach((elm: HTMLElement) => {
				elm.style &&
				elm.style.fontSize &&
				elm.setAttribute(
					'data-font-size',
					elm.style.fontSize.toString()
				);
			});

			this.doc.execCommand('fontsize', false, '7');

			$$('*[data-font-size]', this.area).forEach((elm: HTMLElement) => {
				if (elm.style && elm.getAttribute('data-font-size')) {
					elm.style.fontSize = elm.getAttribute('data-font-size');
					elm.removeAttribute('data-font-size');
				}
			});

			$$('font[size="7"]', this.area).forEach((font: HTMLElement) => {
				if (
					!Dom.next(
						font,
						findNextCondition,
						font.parentNode as HTMLElement
					) &&
					!Dom.prev(
						font,
						findNextCondition,
						font.parentNode as HTMLElement
					) &&
					isSuitElement(font.parentNode as HTMLElement) &&
					font.parentNode !== this.area &&
					(!Dom.isBlock(font.parentNode, this.win) ||
						consts.IS_BLOCK.test(nodeName))
				) {
					toggleStyles(font.parentNode as HTMLElement);
				} else if (
					font.firstChild &&
					!Dom.next(
						font.firstChild,
						findNextCondition,
						font as HTMLElement
					) &&
					!Dom.prev(
						font.firstChild,
						findNextCondition,
						font as HTMLElement
					) &&
					isSuitElement(font.firstChild as HTMLElement)
				) {
					toggleStyles(font.firstChild as HTMLElement);
				} else if (Dom.closest(font, isSuitElement, this.area)) {
					const
						leftRange = this.createRange(),
						wrapper = Dom.closest(
							font,
							isSuitElement,
							this.area
						) as HTMLElement;

					leftRange.setStartBefore(wrapper);
					leftRange.setEndBefore(font);

					const leftFragment: DocumentFragment = leftRange.extractContents();

					if (
						(!leftFragment.textContent ||
							!trim(leftFragment.textContent).length) &&
						leftFragment.firstChild
					) {
						Dom.unwrap(leftFragment.firstChild);
					}

					if (wrapper.parentNode) {
						wrapper.parentNode.insertBefore(leftFragment, wrapper);
					}

					leftRange.setStartAfter(font);
					leftRange.setEndAfter(wrapper);
					const rightFragment = leftRange.extractContents();

					// case then marker can be inside fragnment
					if (
						(!rightFragment.textContent ||
							!trim(rightFragment.textContent).length) &&
						rightFragment.firstChild
					) {
						Dom.unwrap(rightFragment.firstChild);
					}

					Dom.after(wrapper, rightFragment);

					toggleStyles(wrapper);
				} else {
					// unwrap all suit elements inside
					const needUnwrap: Node[] = [];
					let firstElementSuit: boolean | undefined;

					if (font.firstChild) {
						Dom.find(
							font.firstChild,
							(elm: Node | null) => {
								if (elm && isSuitElement(elm as HTMLElement)) {
									if (firstElementSuit === undefined) {
										firstElementSuit = true;
									}
									needUnwrap.push(elm);
								} else {
									if (firstElementSuit === undefined) {
										firstElementSuit = false;
									}
								}
								return false;
							},
							font,
							true
						);
					}

					needUnwrap.forEach(Dom.unwrap);

					if (!firstElementSuit) {
						if (mode === undefined) {
							mode = WRAP;
						}
						if (mode === WRAP) {
							css(
								Dom.replace(
									font,
									nodeName,
									false,
									false,
									this.doc
								),
								cssRules &&
								nodeName.toUpperCase() === defaultTag
									? cssRules
									: {}
							);
						}
					}
				}

				if (font.parentNode) {
					Dom.unwrap(font);
				}
			});

			this.restore(selInfo);
		} else {
			let clearStyle: boolean = false;

			if (
				this.current() &&
				Dom.closest(this.current() as Node, nodeName, this.area)
			) {
				clearStyle = true;
				const closest: Node = Dom.closest(
					this.current() as Node,
					nodeName,
					this.area
				) as Node;
				if (closest) {
					this.setCursorAfter(closest);
				}
			}

			if (nodeName.toUpperCase() === defaultTag || !clearStyle) {
				const node: Node = this.jodit.create.inside.element(nodeName);
				node.appendChild(
					this.jodit.create.inside.text(consts.INVISIBLE_SPACE)
				);

				this.insertNode(node, false, false);

				if (nodeName.toUpperCase() === defaultTag && cssRules) {
					css(node as HTMLElement, cssRules);
				}

				this.setCursorIn(node);
			}
		}
	}
}