/*
 * (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";
(
	/**
	 * @param {Window} window
	 * @param {undefined} undefined
	 */
	function (window, undefined) {


		/*
		 * Import
		 * -----------------------------------------------------------------------------
		 */
		var asc = window["Asc"];
		var asc_lastindexof = asc.lastIndexOf;

		function CharOffset(left, top, height, line) {
			this.left = left;
			this.top = top;
			this.height = height;
			this.lineIndex = line;
		}

		/**
		 * CellTextRender
		 * -----------------------------------------------------------------------------
		 * @param {DrawingContext} drawingCtx  Context for drawing on
		 *
		 * @constructor
		 * @memberOf Asc
		 * @extends {AscCommonExcel.StringRender}
		 */
		function CellTextRender(drawingCtx) {
			AscCommonExcel.StringRender.apply(this, arguments);

			/** @type RegExp */
			this.reWordBegining = new XRegExp("[^\\p{L}\\p{N}\\'][\\p{L}\\p{N}]", "i");

			return this;
		}

		CellTextRender.prototype = Object.create(AscCommonExcel.StringRender.prototype);
		CellTextRender.prototype.constructor = CellTextRender;
		CellTextRender.prototype.getLinesCount = function () {
			return this.lines.length;
		};

		CellTextRender.prototype.getLineInfo = function (index) {
			return this.lines.length > 0 && index >= 0 && index < this.lines.length ? this.lines[index] : null;
		};

		CellTextRender.prototype.calcLineOffset = function (index) {
			if (index < 0) {
				index = 0;
			}
			if (index > this.lines.length) {
				index = this.lines.length;
			}

			var zoom = this.drawingCtx.getZoom();
			for (var i = 0, h = 0, l = this.lines; i < index; ++i) {
				h += Asc.round(l[i].th * zoom);
			}
			return h;
		};
		
		CellTextRender.prototype.getPrevChar = function (pos, skipCombined) {
			if (pos <= 0)
				return 0;
			else if (pos > this.chars.length)
				return this.chars.length;
			
			--pos;
			
			// By default we skip combined chars
			if (false === skipCombined)
				return pos;
			
			while (pos > 0 && this._isCombinedChar(pos)) {
				--pos;
			}
			
			return pos;
		};

		CellTextRender.prototype.getNextChar = function (pos) {
			
			if (pos >= this.chars.length)
				return this.chars.length;
			else if (pos < 0)
				return 0;
			
			++pos;
			while (pos < this.chars.length && this._isCombinedChar(pos)) {
				++pos;
			}
			
			return pos;
		};

		CellTextRender.prototype.getPrevWord = function (pos) {
			//TODO регулярку не меняю, перегоняю в строку
			let s = AscCommonExcel.convertUnicodeToSimpleString(this.chars);
			let i = asc_lastindexof(s.slice(0, pos), this.reWordBegining);
			return i >= 0 ? i + 1 : 0;
		};

		CellTextRender.prototype.getNextWord = function (pos) {
			//TODO регулярку не меняю, перегоняю в строку
			let s = AscCommonExcel.convertUnicodeToSimpleString(this.chars);
			let i = s.slice(pos).search(this.reWordBegining);
			return i >= 0 ? pos + (i + 1) : this.getEndOfLine(pos);
		};

		CellTextRender.prototype.getBeginOfLine = function (pos) {
			pos = pos < 0 ? 0 : Math.min(pos, this.chars.length);

			for (var l = this.lines, i = 0; i < l.length; ++i) {
				if (pos >= l[i].beg && pos <= l[i].end) {
					return l[i].beg;
				}
			}

			// pos - в конце текста
			var lastLine = l.length - 1;
			var lastChar = this.chars.length - 1;
			return this.charWidths[lastChar] !== 0 ? l[lastLine].beg : pos;
		};

		CellTextRender.prototype.getEndOfLine = function (pos) {
			pos = pos < 0 ? 0 : Math.min(pos, this.chars.length);

			var l = this.lines;
			var lastLine = l.length - 1;
			for (var i = 0; i < lastLine; ++i) {
				if (pos >= l[i].beg && pos <= l[i].end) {
					return l[i].end;
				}
			}

			// pos - на последней линии
			var lastChar = this.chars.length - 1;
			return pos > lastChar ? pos : lastChar + (this.charWidths[lastChar] !== 0 ? 1 : 0);
		};

		CellTextRender.prototype.getBeginOfText = function () {
			return 0;
		};

		CellTextRender.prototype.getEndOfText = function () {
			return this.chars.length;
		};

		CellTextRender.prototype.getPrevLine = function (pos) {
			pos = pos < 0 ? 0 : Math.min(pos, this.chars.length);

			for (var l = this.lines, i = 0; i < l.length; ++i) {
				if (pos >= l[i].beg && pos <= l[i].end) {
					return i <= 0 ? 0 : Math.min(l[i - 1].beg + pos - l[i].beg, l[i - 1].end);
				}
			}

			// pos - в конце текста
			var lastLine = l.length - 1;
			var lastChar = this.chars.length - 1;
			return this.charWidths[lastChar] === 0 || l.length < 2 ?
				(0 > lastLine ? 0 : l[lastLine].beg) :
				lastChar > 0 ? Math.min(l[lastLine - 1].beg + pos - l[lastLine].beg, l[lastLine - 1].end) : 0;
		};

		CellTextRender.prototype.getNextLine = function (pos) {
			pos = pos < 0 ? 0 : Math.min(pos, this.chars.length);

			var l = this.lines;
			var lastLine = l.length - 1;
			for (var i = 0; i < lastLine; ++i) {
				if (pos >= l[i].beg && pos <= l[i].end) {
					return Math.min(l[i + 1].beg + pos - l[i].beg, l[i + 1].end);
				}
			}

			// pos - на последней линии
			return this.chars.length;
		};

		CellTextRender.prototype.getCharInfo = function (pos) {
			for (var p = this.charProps[pos]; (!p || !p.font) && pos > 0; --pos) {
				p = this.charProps[pos - 1];
			}
			return {
				fsz: p.font.FontSize,
				dh: p && p.lm && p.lm.bl2 > 0 ? p.lm.bl2 - p.lm.bl : 0,
				h: p && p.lm ? p.lm.th : 0
			};
		};

		CellTextRender.prototype.charOffset = function (pos, lineIndex, h) {
			var zoom = this.drawingCtx.getZoom();
			var li = this.lines[lineIndex];
			return new CharOffset(li.startX + (pos > 0 ? this._calcCharsWidth(li.beg, pos - 1) : 0), Asc.round(
				h * zoom), Asc.round(li.th * zoom), lineIndex);
		};

		CellTextRender.prototype.calcCharOffset = function (pos, lineIndex) {
			var t = this, l = t.lines, i, h, co;

			if (l.length < 1) {
				return null;
			}

			if (pos < 0) {
				pos = 0;
			}
			if (pos > t.chars.length) {
				pos = t.chars.length;
			}

			for (i = 0, h = 0; i < l.length; ++i) {
				if (pos >= l[i].beg && pos <= l[i].end) {
					//end of line and start of line can have same index
					if (!(lineIndex != null && (pos === l[i].end/* || pos === l[i].beg*/) && lineIndex !== i)) {
						return this.charOffset(pos, i, h);
					}
				}
				if (i !== l.length - 1) {
					h += l[i].th;
				}
			}

			co = this.charOffset(pos, i - 1, h);
			return co;
		};

		CellTextRender.prototype.getCharsCount = function () {
			return this.chars.length;
		};

		CellTextRender.prototype.getChars = function (pos, len) {
			return this.chars.slice(pos, pos + len);
		};

		CellTextRender.prototype.getCharWidth = function (pos) {
			return this.charWidths[pos];
		};
		
		CellTextRender.prototype.getCharPosByXY = function(x, y, topLine, zoom) {
			
			let line = this.getLineByY(y, topLine, zoom);
			if (line < 0) {
				return -1;
			}
			
			let lineInfo = this.getLineInfo(line);
			let _x = lineInfo.startX;
			let dist = Math.abs(x - _x);
			let resultPos = lineInfo.beg;
			
			for (let charPos = lineInfo.beg; charPos <= lineInfo.end; ++charPos) {
				
				if (!this._isCombinedChar(charPos) && dist > Math.abs(x - _x)) {
					dist = Math.abs(x - _x);
					resultPos = charPos;
				}
				
				_x += this.getCharWidth(charPos);
			}
			
			if (Math.abs(x - _x) < dist)
				resultPos = line === this.getLinesCount() - 1 ?  lineInfo.end + 1 : lineInfo.end;
			
			return resultPos;
		};

		CellTextRender.prototype.getCharPosByXY = function(x, y, topLine, zoom) {
			let line = this.getLineByY(y, topLine, zoom);
			if (line < 0) {
				return -1;
			}

			let lineInfo = this.getLineInfo(line);
			let _x = lineInfo.startX;
			let dist = Math.abs(x - _x);
			let resultPos = lineInfo.beg;

			for (let charPos = lineInfo.beg; charPos <= lineInfo.end; ++charPos) {

				if (!this._isCombinedChar(charPos) && dist > Math.abs(x - _x)) {
					dist = Math.abs(x - _x);
					resultPos = charPos;
				}

				_x += this.getCharWidth(charPos);
			}

			if (Math.abs(x - _x) < dist)
				resultPos = line === this.getLinesCount() - 1 ?  lineInfo.end + 1 : lineInfo.end;

			// Если текст обрабатывался как bidi, корректируем позицию
			if (this.bidiProcessed && this.baseDirection === AscFonts.HB_DIRECTION.HB_DIRECTION_RTL) {
				let line = this.getLineByY(y, topLine, zoom);
				if (line >= 0) {
					let lineInfo = this.getLineInfo(line);
					// Для RTL строк логика поиска позиции может быть скорректирована
					// Пока оставляем базовую логику, но это место для дальнейших улучшений
				}
			}

			return resultPos;
		};
		
		CellTextRender.prototype.getLineByY = function(y, topLine, zoom) {
			let lineCount = this.getLinesCount();
			if (lineCount <= 0) {
				return -1;
			}
			
			let lineInfo;
			for (let _y = 0, line = Math.max(topLine, 0); line < lineCount; ++line) {
				lineInfo = this.getLineInfo(line);
				_y += Asc.round(lineInfo.th * zoom);
				if (y <= _y) {
					return line;
				}
			}
			
			return lineCount - 1;
		};
		

		//------------------------------------------------------------export---------------------------------------------------
		window['AscCommonExcel'] = window['AscCommonExcel'] || {};
		window["AscCommonExcel"].CellTextRender = CellTextRender;
	}
)(window);