/*
 * (c) Copyright Ascensio System SIA 2010-2024
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation. In accordance with
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at 20A-6 Ernesta Birznieka-Upish
 * street, Riga, Latvia, EU, LV-1050.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
 */

"use strict";

(function(window)
{
	let hyphenator = null;
	function getInstance()
	{
		if (!hyphenator)
			hyphenator = new TextHyphenator();
		
		return hyphenator;
	}
	
	function getWaitingLangCallback(lang, hyphenator)
	{
		return function()
		{
			hyphenator.onLoadLang(lang);
		};
	}
	
	const DEFAULT_LANG = lcid_enUS;
	
	/**
	 * Класс для автоматической расстановки переносов в тексте
	 * @constructor
	 */
	function TextHyphenator()
	{
		this.word     = false;
		this.fontSlot = fontslot_Unknown;
		this.lang     = DEFAULT_LANG;
		this.buffer   = [];
		
		this.hyphenateCaps = true;
		
		this.document     = null;
		this.paragraph    = null;
		this.waitingLangs = {};
	}
	TextHyphenator.hyphenate = function(paragraph)
	{
		let hyphenator = getInstance();
		hyphenator.hyphenateParagraph(paragraph);
	};
	////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	// Private area
	////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	TextHyphenator.prototype.hyphenateParagraph = function(paragraph)
	{
		if (!this.document)
			this.document = paragraph.GetLogicDocument();
		
		this.paragraph = paragraph;
		this.checkHyphenateCaps(paragraph);
		
		let self = this;
		paragraph.CheckRunContent(function(run, startPos, endPos)
		{
			self.hyphenateRun(run, startPos, endPos);
		});
		this.flushWord();
	};
	TextHyphenator.prototype.hyphenateRun = function(run, startPos, endPos)
	{
		for (let pos = startPos; pos < endPos; ++pos)
		{
			let item = run.GetElement(pos);
			if (!item.IsText())
			{
				this.flushWord();
			}
			else if (item.IsNBSP() || item.IsPunctuation())
			{
				this.flushWord();
			}
			else
			{
				if (!this.word)
					this.updateLang(run, item.GetFontSlot(run.Get_CompiledPr(false)));
				
				this.appendToWord(item);
				
				if (item.IsSpaceAfter())
					this.flushWord();
			}
		}
	};
	TextHyphenator.prototype.resetBuffer = function()
	{
		this.buffer.length = 0;
		AscHyphenation.clear();
	};
	TextHyphenator.prototype.updateLang = function(run, fontSlot)
	{
		let textPr = run.Get_CompiledPr(false);
		let lang;
		switch (fontSlot)
		{
			case fontslot_EastAsia:
				lang = textPr.Lang.EastAsia;
				break;
			case fontslot_CS:
				lang = textPr.Lang.Bidi;
				break;
			case fontslot_HAnsi:
			case fontslot_ASCII:
			default:
				lang = textPr.Lang.Val;
				break;
		}
		
		if (textPr.CS)
		{
			lang     = textPr.Lang.Bidi;
			fontSlot = fontslot_CS;
		}
		
		this.lang     = lang;
		this.fontSlot = fontSlot;
	};
	TextHyphenator.prototype.appendToWord = function(textItem)
	{
		this.word = true;
		this.buffer.push(textItem);
		AscHyphenation.addCodePoint(String.fromCodePoint(textItem.GetCodePoint()).toLowerCase().codePointAt(0));
		textItem.SetHyphenAfter(false);
	};
	TextHyphenator.prototype.flushWord = function()
	{
		if (!this.word)
			return;
		
		this.word = false;
		
		if (!this.isHyphenateCaps() && this.isAllCaps())
			return this.resetBuffer();
		
		if (!this.checkLangAvailability())
			return this.resetBuffer();
		
		let result = AscHyphenation.hyphenate();
		for (let i = 0, len = result.length; i < len; ++i)
		{
			let pos = result[i] - 1;
			if (pos < 0 || pos >= this.buffer.length - 1)
				continue;
			
			this.buffer[pos].SetHyphenAfter(true);
		}
		
		this.resetBuffer();
	};
	TextHyphenator.prototype.isAllCaps = function()
	{
		for (let i = 0, len = this.buffer.length; i < len; ++i)
		{
			let char = String.fromCodePoint(this.buffer[i].GetCodePoint());
			if (char.toUpperCase() !== char)
				return false;
		}
		
		return true;
	};
	TextHyphenator.prototype.checkHyphenateCaps = function(paragraph)
	{
		this.hyphenateCaps = true;
		
		let logicDocument = paragraph.GetLogicDocument();
		if (logicDocument && logicDocument.IsDocumentEditor())
			this.hyphenateCaps = logicDocument.GetDocumentSettings().isHyphenateCaps();
	};
	TextHyphenator.prototype.isHyphenateCaps = function()
	{
		return this.hyphenateCaps;
	};
	TextHyphenator.prototype.checkLangAvailability = function()
	{
		if (this.waitingLangs[this.lang])
		{
			this.waitingLangs[this.lang][this.paragraph.GetId()] = this.paragraph;
			return false;
		}
		
		if (AscHyphenation.setLang(this.lang, getWaitingLangCallback(this.lang, this)))
			return true;
		
		if (!this.waitingLangs[this.lang])
			this.waitingLangs[this.lang] = {};
		
		this.waitingLangs[this.lang][this.paragraph.GetId()] = this.paragraph;
		return false;
	};
	TextHyphenator.prototype.onLoadLang = function(lang)
	{
		if (!this.waitingLangs[lang])
			return;
		
		let paragraphs = [];
		for (let paraId in this.waitingLangs[lang])
		{
			this.waitingLangs[lang][paraId].NeedHyphenateText();
			paragraphs.push(this.waitingLangs[lang][paraId]);
		}
		delete this.waitingLangs[lang];
		
		if (this.document)
		{
			let history    = this.document.GetHistory();
			let recalcData = history.getRecalcDataByElements(paragraphs);
			this.document.RecalculateWithParams(recalcData);
			this.document.NeedUpdateTarget = false;
		}
	};
	//--------------------------------------------------------export----------------------------------------------------
	window['AscWord'].TextHyphenator = TextHyphenator;
	
})(window);