/*!
 * 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 { Config } from '../Config';
import { Dom } from '../modules/Dom';
import { debounce, setTimeout } from '../modules/helpers/async';
import { offset } from '../modules/helpers/size';
import { ToolbarIcon } from '../modules/toolbar/icon';
import { IBound, IJodit } from '../types';

declare module '../Config' {
	interface Config {
		addNewLine: boolean;
		addNewLineTagsTriggers: string[];
		addNewLineOnDBLClick: boolean;
	}
}

/**
 * Create helper
 * @type {boolean}
 */
Config.prototype.addNewLine = true;

/**
 * On dbl click on empty space of editor it add new P element
 * @type {boolean}
 */
Config.prototype.addNewLineOnDBLClick = true;

/**
 * Whar kind of tags it will be impact
 * @type {string[]}
 */
Config.prototype.addNewLineTagsTriggers = [
	'table',
	'iframe',
	'img',
	'hr',
	'jodit'
];

/**
 * Create helper for adding new paragraph(Jodit.defaultOptions.enter tag) before iframe, table or image
 *
 * @param {Jodit} editor
 */

export function addNewLine(editor: IJodit) {
	if (!editor.options.addNewLine) {
		return;
	}

	const line: HTMLDivElement = editor.create.fromHTML(
		'<div role="button" tabIndex="-1" title="' +
			editor.i18n('Break') +
			'" class="jodit-add-new-line"><span>' +
			ToolbarIcon.getIcon('enter') +
			'</span></div>'
	) as HTMLDivElement;

	const delta = 10;
	const isMatchedTag = new RegExp(
		'^(' + editor.options.addNewLineTagsTriggers.join('|') + ')$',
		'i'
	);

	let timeout: number;
	let hidden: boolean = false;
	let preview: boolean = false;
	let current: HTMLElement | false;

	let lineInFocus: boolean = false;

	const show = () => {
		if (editor.options.readonly || editor.isLocked()) {
			return;
		}

		if (editor.container.classList.contains('jodit_popup_active')) {
			return;
		}

		clearTimeout(timeout);
		line.classList.toggle('jodit-add-new-line_after', !preview);
		line.style.display = 'block';
		line.style.width = editor.editor.clientWidth + 'px';
		hidden = false;
	};

	const hideForce = () => {
		clearTimeout(timeout);
		lineInFocus = false;
		line.style.display = 'none';
		hidden = true;
	};

	const canGetFocus = (elm: Node | null): boolean => {
		return (
			elm !== null &&
			Dom.isBlock(elm, editor.editorWindow) &&
			!/^(img|table|iframe|hr)$/i.test(elm.nodeName)
		);
	};

	const hide = () => {
		if (hidden || lineInFocus) {
			return;
		}
		clearTimeout(timeout);
		timeout = setTimeout(hideForce, 500);
	};

	editor.events
		.on('beforeDestruct', () => {
			Dom.safeRemove(line);
		})
		.on('afterInit', () => {
			editor.container.appendChild(line);
			editor.events
				.on(line, 'mousemove', (e: MouseEvent) => {
					e.stopPropagation();
				})
				.on(line, 'mousedown touchstart', (e: MouseEvent) => {
					const p: HTMLElement = editor.editorDocument.createElement(
						editor.options.enter
					);

					if (preview && current && current.parentNode) {
						current.parentNode.insertBefore(p, current);
					} else {
						editor.editor.appendChild(p);
					}

					editor.selection.setCursorIn(p);

					editor.events.fire('synchro');
					hideForce();
					e.preventDefault();
				});
		})
		.on('afterInit', () => {
			editor.events
				.on(editor.editor, 'scroll', () => {
					hideForce();
				})
				.on(editor.container, 'mouseleave', hide)
				.on(line, 'mouseenter', () => {
					clearTimeout(timeout);
					lineInFocus = true;
				})
				.on(line, 'mouseleave', () => {
					lineInFocus = false;
				})
				.on(editor.editor, 'dblclick', (e: MouseEvent) => {
					if (
						!editor.options.readonly &&
						editor.options.addNewLineOnDBLClick &&
						e.target === editor.editor &&
						editor.selection.isCollapsed()
					) {
						const editorBound: IBound = offset(
							editor.editor,
							editor,
							editor.editorDocument
						);
						const top: number =
							e.pageY - editor.editorWindow.pageYOffset;
						const p: HTMLElement = editor.editorDocument.createElement(
							editor.options.enter
						);

						if (
							Math.abs(top - editorBound.top) <
								Math.abs(
									top - (editorBound.height + editorBound.top)
								) &&
							editor.editor.firstChild
						) {
							editor.editor.insertBefore(
								p,
								editor.editor.firstChild
							);
						} else {
							editor.editor.appendChild(p);
						}

						editor.selection.setCursorIn(p);
						editor.setEditorValue();
						hideForce();
						e.preventDefault();
					}
				})
				.on(
					editor.editor,
					'mousemove',
					debounce((e: MouseEvent) => {
						let currentElement: HTMLElement = editor.editorDocument.elementFromPoint(
							e.pageX - editor.editorWindow.pageXOffset,
							e.pageY - editor.editorWindow.pageYOffset
						) as HTMLElement;

						if (
							currentElement &&
							Dom.isOrContains(line, currentElement)
						) {
							return;
						}

						if (
							!currentElement ||
							!Dom.isOrContains(editor.editor, currentElement)
						) {
							return;
						}

						if (
							!currentElement ||
							!currentElement.nodeName.match(isMatchedTag) ||
							!Dom.isOrContains(editor.editor, currentElement)
						) {
							currentElement = Dom.closest(
								currentElement,
								isMatchedTag,
								editor.editor
							) as HTMLElement;
							if (!currentElement) {
								hide();
								return;
							}
						}

						if (isMatchedTag.test(currentElement.nodeName)) {
							const parentBox: Node | false = Dom.up(
								currentElement,
								node => Dom.isBlock(node, editor.editorWindow),
								editor.editor
							);
							if (parentBox && parentBox !== editor.editor) {
								currentElement = parentBox as HTMLElement;
							}
						}

						const editorBound: IBound = offset(
							editor.editor,
							editor,
							editor.editorDocument
						);
						const position: IBound = offset(
							currentElement as HTMLElement,
							editor,
							editor.editorDocument
						);

						let top: false | number = false;

						if (Math.abs(e.pageY - position.top) < delta) {
							top = position.top;
							if (top - editorBound.top >= 20) {
								top -= 15;
							}
							preview = true;
						}
						if (
							Math.abs(
								e.pageY - (position.top + position.height)
							) < delta
						) {
							top = position.top + position.height;
							if (
								editorBound.top + editorBound.height - top >=
								25
							) {
								top += 15;
							}
							preview = false;
						}

						if (
							top !== false &&
							((preview &&
								!Dom.prev(
									currentElement,
									canGetFocus,
									editor.editor
								)) ||
								(!preview &&
									!Dom.next(
										currentElement,
										canGetFocus,
										editor.editor
									)))
						) {
							line.style.top = top + 'px';
							current = currentElement;
							show();
						} else {
							current = false;
							hide();
						}
					}, editor.defaultTimeout)
				);
		});
}