package org.jabref.gui.preview;

import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Objects;
import java.util.Optional;
import java.util.regex.Pattern;

import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.value.ChangeListener;
import javafx.concurrent.Worker;
import javafx.print.PrinterJob;
import javafx.scene.control.ScrollPane;
import javafx.scene.input.ClipboardContent;
import javafx.scene.web.WebView;

import org.jabref.gui.ClipBoardManager;
import org.jabref.gui.DialogService;
import org.jabref.gui.Globals;
import org.jabref.gui.StateManager;
import org.jabref.gui.desktop.JabRefDesktop;
import org.jabref.gui.theme.ThemeManager;
import org.jabref.gui.util.BackgroundTask;
import org.jabref.gui.util.TaskExecutor;
import org.jabref.logic.l10n.Localization;
import org.jabref.logic.layout.format.Number;
import org.jabref.logic.preview.PreviewLayout;
import org.jabref.logic.search.SearchQuery;
import org.jabref.logic.util.WebViewStore;
import org.jabref.model.database.BibDatabaseContext;
import org.jabref.model.entry.BibEntry;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.events.EventTarget;
import org.w3c.dom.html.HTMLAnchorElement;

/**
 * Displays an BibEntry using the given layout format.
 */
public class PreviewViewer extends ScrollPane implements InvalidationListener {

    private static final Logger LOGGER = LoggerFactory.getLogger(PreviewViewer.class);

    // https://stackoverflow.com/questions/5669448/get-selected-texts-html-in-div/5670825#5670825
    private static final String JS_GET_SELECTION_HTML_SCRIPT = """
                                                                   function getSelectionHtml() {
                                                                   var html = "";
                                                                   if (typeof window.getSelection != "undefined") {
                                                                       var sel = window.getSelection();
                                                                       if (sel.rangeCount) {
                                                                           var container = document.createElement("div");
                                                                           for (var i = 0, len = sel.rangeCount; i < len; ++i) {
                                                                               container.appendChild(sel.getRangeAt(i).cloneContents());
                                                                           }
                                                                           html = container.innerHTML;
                                                                       }
                                                                   } else if (typeof document.selection != "undefined") {
                                                                       if (document.selection.type == "Text") {
                                                                           html = document.selection.createRange().htmlText;
                                                                       }
                                                                   }
                                                                   return html;
                                                                   }
                                                               getSelectionHtml();
                                                               """;
    private static final String JS_HIGHLIGHT_FUNCTION =
            """
                    <head>
                       <meta charset="UTF-8">
                       <style>
                           mark{
                               background: orange;
                               color: black;
                           }
                       </style>
                       <script type="text/javascript">
                    /*!***************************************************
                    * mark.js v9.0.0
                    * https://markjs.io/
                    * Copyright (c) 2014–2018, Julian Kühnel
                    * Released under the MIT license https://git.io/vwTVl
                    *****************************************************/

                    !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.Mark=t()}(this,function(){"use strict";function e(t){return(e="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(t)}function t(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function n(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}function r(e,t,r){return t&&n(e.prototype,t),r&&n(e,r),e}function o(){return(o=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e}).apply(this,arguments)}var i=

                    /* */

                    function(){function e(n){var r=!(arguments.length>1&&void 0!==arguments[1])||arguments[1],o=arguments.length>2&&void 0!==arguments[2]?arguments[2]:[],i=arguments.length>3&&void 0!==arguments[3]?arguments[3]:5e3;t(this,e),this.ctx=n,this.iframes=r,this.exclude=o,this.iframesTimeout=i}return r(e,[{key:"getContexts",value:function(){var e=[];return(void 0!==this.ctx&&this.ctx?NodeList.prototype.isPrototypeOf(this.ctx)?Array.prototype.slice.call(this.ctx):Array.isArray(this.ctx)?this.ctx:"string"==typeof this.ctx?Array.prototype.slice.call(document.querySelectorAll(this.ctx)):[this.ctx]:[]).forEach(function(t){var n=e.filter(function(e){return e.contains(t)}).length>0;-1!==e.indexOf(t)||n||e.push(t)}),e}},{key:"getIframeContents",value:function(e,t){var n,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:function(){};try{var o=e.contentWindow;if(n=o.document,!o||!n)throw new Error("iframe inaccessible")}catch(e){r()}n&&t(n)}},{key:"isIframeBlank",value:function(e){var t="about:blank",n=e.getAttribute("src").trim();return e.contentWindow.location.href===t&&n!==t&&n}},{key:"observeIframeLoad",value:function(e,t,n){var r=this,o=!1,i=null,a=function a(){if(!o){o=!0,clearTimeout(i);try{r.isIframeBlank(e)||(e.removeEventListener("load",a),r.getIframeContents(e,t,n))}catch(e){n()}}};e.addEventListener("load",a),i=setTimeout(a,this.iframesTimeout)}},{key:"onIframeReady",value:function(e,t,n){try{"complete"===e.contentWindow.document.readyState?this.isIframeBlank(e)?this.observeIframeLoad(e,t,n):this.getIframeContents(e,t,n):this.observeIframeLoad(e,t,n)}catch(e){n()}}},{key:"waitForIframes",value:function(e,t){var n=this,r=0;this.forEachIframe(e,function(){return!0},function(e){r++,n.waitForIframes(e.querySelector("html"),function(){--r||t()})},function(e){e||t()})}},{key:"forEachIframe",value:function(t,n,r){var o=this,i=arguments.length>3&&void 0!==arguments[3]?arguments[3]:function(){},a=t.querySelectorAll("iframe"),s=a.length,c=0;a=Array.prototype.slice.call(a);var u=function(){--s<=0&&i(c)};s||u(),a.forEach(function(t){e.matches(t,o.exclude)?u():o.onIframeReady(t,function(e){n(t)&&(c++,r(e)),u()},u)})}},{key:"createIterator",value:function(e,t,n){return document.createNodeIterator(e,t,n,!1)}},{key:"createInstanceOnIframe",value:function(t){return new e(t.querySelector("html"),this.iframes)}},{key:"compareNodeIframe",value:function(e,t,n){if(e.compareDocumentPosition(n)&Node.DOCUMENT_POSITION_PRECEDING){if(null===t)return!0;if(t.compareDocumentPosition(n)&Node.DOCUMENT_POSITION_FOLLOWING)return!0}return!1}},{key:"getIteratorNode",value:function(e){var t=e.previousNode();return{prevNode:t,node:null===t?e.nextNode():e.nextNode()&&e.nextNode()}}},{key:"checkIframeFilter",value:function(e,t,n,r){var o=!1,i=!1;return r.forEach(function(e,t){e.val===n&&(o=t,i=e.handled)}),this.compareNodeIframe(e,t,n)?(!1!==o||i?!1===o||i||(r[o].handled=!0):r.push({val:n,handled:!0}),!0):(!1===o&&r.push({val:n,handled:!1}),!1)}},{key:"handleOpenIframes",value:function(e,t,n,r){var o=this;e.forEach(function(e){e.handled||o.getIframeContents(e.val,function(e){o.createInstanceOnIframe(e).forEachNode(t,n,r)})})}},{key:"iterateThroughNodes",value:function(e,t,n,r,o){for(var i,a,s,c=this,u=this.createIterator(t,e,r),l=[],h=[];s=void 0,s=c.getIteratorNode(u),a=s.prevNode,i=s.node;)this.iframes&&this.forEachIframe(t,function(e){return c.checkIframeFilter(i,a,e,l)},function(t){c.createInstanceOnIframe(t).forEachNode(e,function(e){return h.push(e)},r)}),h.push(i);h.forEach(function(e){n(e)}),this.iframes&&this.handleOpenIframes(l,e,n,r),o()}},{key:"forEachNode",value:function(e,t,n){var r=this,o=arguments.length>3&&void 0!==arguments[3]?arguments[3]:function(){},i=this.getContexts(),a=i.length;a||o(),i.forEach(function(i){var s=function(){r.iterateThroughNodes(e,i,t,n,function(){--a<=0&&o()})};r.iframes?r.waitForIframes(i,s):s()})}}],[{key:"matches",value:function(e,t){var n="string"==typeof t?[t]:t,r=e.matches||e.matchesSelector||e.msMatchesSelector||e.mozMatchesSelector||e.oMatchesSelector||e.webkitMatchesSelector;if(r){var o=!1;return n.every(function(t){return!r.call(e,t)||(o=!0,!1)}),o}return!1}}]),e}(),a=

                    /* */

                    function(){function e(n){t(this,e),this.opt=o({},{diacritics:!0,synonyms:{},accuracy:"partially",caseSensitive:!1,ignoreJoiners:!1,ignorePunctuation:[],wildcards:"disabled"},n)}return r(e,[{key:"create",value:function(e){return"disabled"!==this.opt.wildcards&&(e=this.setupWildcardsRegExp(e)),e=this.escapeStr(e),Object.keys(this.opt.synonyms).length&&(e=this.createSynonymsRegExp(e)),(this.opt.ignoreJoiners||this.opt.ignorePunctuation.length)&&(e=this.setupIgnoreJoinersRegExp(e)),this.opt.diacritics&&(e=this.createDiacriticsRegExp(e)),e=this.createMergedBlanksRegExp(e),(this.opt.ignoreJoiners||this.opt.ignorePunctuation.length)&&(e=this.createJoinersRegExp(e)),"disabled"!==this.opt.wildcards&&(e=this.createWildcardsRegExp(e)),e=this.createAccuracyRegExp(e),new RegExp(e,"gm".concat(this.opt.caseSensitive?"":"i"))}},{key:"sortByLength",value:function(e){return e.sort(function(e,t){return e.length===t.length?e>t?1:-1:t.length-e.length})}},{key:"escapeStr",value:function(e){return e.replace(/[\\-\\[\\]\\/\\{\\}\\(\\)\\*\\+\\?\\.\\\\\\^\\$\\|]/g,"\\\\$&")}},{key:"createSynonymsRegExp",value:function(e){var t=this,n=this.opt.synonyms,r=this.opt.caseSensitive?"":"i",o=this.opt.ignoreJoiners||this.opt.ignorePunctuation.length?"\\0":"";for(var i in n)if(n.hasOwnProperty(i)){var a=Array.isArray(n[i])?n[i]:[n[i]];a.unshift(i),(a=this.sortByLength(a).map(function(e){return"disabled"!==t.opt.wildcards&&(e=t.setupWildcardsRegExp(e)),e=t.escapeStr(e)}).filter(function(e){return""!==e})).length>1&&(e=e.replace(new RegExp("(".concat(a.map(function(e){return t.escapeStr(e)}).join("|"),")"),"gm".concat(r)),o+"(".concat(a.map(function(e){return t.processSynonyms(e)}).join("|"),")")+o))}return e}},{key:"processSynonyms",value:function(e){return(this.opt.ignoreJoiners||this.opt.ignorePunctuation.length)&&(e=this.setupIgnoreJoinersRegExp(e)),e}},{key:"setupWildcardsRegExp",value:function(e){return(e=e.replace(/(?:\\\\)*\\?/g,function(e){return"\\\\"===e.charAt(0)?"?":"\u0001"})).replace(/(?:\\\\)*\\*/g,function(e){return"\\\\"===e.charAt(0)?"*":"\u0002"})}},{key:"createWildcardsRegExp",value:function(e){var t="withSpaces"===this.opt.wildcards;return e.replace(/\\u0001/g,t?"[\\\\S\\\\s]?":"\\\\S?").replace(/\\u0002/g,t?"[\\\\S\\\\s]*?":"\\\\S*")}},{key:"setupIgnoreJoinersRegExp",value:function(e){return e.replace(/[^(|)\\\\]/g,function(e,t,n){var r=n.charAt(t+1);return/[(|)\\\\]/.test(r)||""===r?e:e+"\\0"})}},{key:"createJoinersRegExp",value:function(e){var t=[],n=this.opt.ignorePunctuation;return Array.isArray(n)&&n.length&&t.push(this.escapeStr(n.join(""))),this.opt.ignoreJoiners&&t.push("\\\\u00ad\\\\u200b\\\\u200c\\\\u200d"),t.length?e.split(/\\u0000+/).join("[".concat(t.join(""),"]*")):e}},{key:"createDiacriticsRegExp",value:function(e){var t=this.opt.caseSensitive?"":"i",n=this.opt.caseSensitive?["aàáảãạăằắẳẵặâầấẩẫậäåāą","AÀÁẢÃẠĂẰẮẲẴẶÂẦẤẨẪẬÄÅĀĄ","cçćč","CÇĆČ","dđď","DĐĎ","eèéẻẽẹêềếểễệëěēę","EÈÉẺẼẸÊỀẾỂỄỆËĚĒĘ","iìíỉĩịîïī","IÌÍỈĨỊÎÏĪ","lł","LŁ","nñňń","NÑŇŃ","oòóỏõọôồốổỗộơởỡớờợöøō","OÒÓỎÕỌÔỒỐỔỖỘƠỞỠỚỜỢÖØŌ","rř","RŘ","sšśșş","SŠŚȘŞ","tťțţ","TŤȚŢ","uùúủũụưừứửữựûüůū","UÙÚỦŨỤƯỪỨỬỮỰÛÜŮŪ","yýỳỷỹỵÿ","YÝỲỶỸỴŸ","zžżź","ZŽŻŹ"]:["aàáảãạăằắẳẵặâầấẩẫậäåāąAÀÁẢÃẠĂẰẮẲẴẶÂẦẤẨẪẬÄÅĀĄ","cçćčCÇĆČ","dđďDĐĎ","eèéẻẽẹêềếểễệëěēęEÈÉẺẼẸÊỀẾỂỄỆËĚĒĘ","iìíỉĩịîïīIÌÍỈĨỊÎÏĪ","lłLŁ","nñňńNÑŇŃ","oòóỏõọôồốổỗộơởỡớờợöøōOÒÓỎÕỌÔỒỐỔỖỘƠỞỠỚỜỢÖØŌ","rřRŘ","sšśșşSŠŚȘŞ","tťțţTŤȚŢ","uùúủũụưừứửữựûüůūUÙÚỦŨỤƯỪỨỬỮỰÛÜŮŪ","yýỳỷỹỵÿYÝỲỶỸỴŸ","zžżźZŽŻŹ"],r=[];return e.split("").forEach(function(o){n.every(function(n){if(-1!==n.indexOf(o)){if(r.indexOf(n)>-1)return!1;e=e.replace(new RegExp("[".concat(n,"]"),"gm".concat(t)),"[".concat(n,"]")),r.push(n)}return!0})}),e}},{key:"createMergedBlanksRegExp",value:function(e){return e.replace(/[\\s]+/gim,"[\\\\s]+")}},{key:"createAccuracyRegExp",value:function(e){var t=this,n=this.opt.accuracy,r="string"==typeof n?n:n.value,o="string"==typeof n?[]:n.limiters,i="";switch(o.forEach(function(e){i+="|".concat(t.escapeStr(e))}),r){case"partially":default:return"()(".concat(e,")");case"complementary":return i="\\\\s"+(i||this.escapeStr("!\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~¡¿")),"()([^".concat(i,"]*").concat(e,"[^").concat(i,"]*)");case"exactly":return"(^|\\\\s".concat(i,")(").concat(e,")(?=$|\\\\s").concat(i,")")}}}]),e}(),s=

                    /* */

                    function(){function n(e){t(this,n),this.ctx=e,this.ie=!1;var r=window.navigator.userAgent;(r.indexOf("MSIE")>-1||r.indexOf("Trident")>-1)&&(this.ie=!0)}return r(n,[{key:"log",value:function(t){var n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:"debug",r=this.opt.log;this.opt.debug&&"object"===e(r)&&"function"==typeof r[n]&&r[n]("mark.js: ".concat(t))}},{key:"getSeparatedKeywords",value:function(e){var t=this,n=[];return e.forEach(function(e){t.opt.separateWordSearch?e.split(" ").forEach(function(e){e.trim()&&-1===n.indexOf(e)&&n.push(e)}):e.trim()&&-1===n.indexOf(e)&&n.push(e)}),{keywords:n.sort(function(e,t){return t.length-e.length}),length:n.length}}},{key:"isNumeric",value:function(e){return Number(parseFloat(e))==e}},{key:"checkRanges",value:function(e){var t=this;if(!Array.isArray(e)||"[object Object]"!==Object.prototype.toString.call(e[0]))return this.log("markRanges() will only accept an array of objects"),this.opt.noMatch(e),[];var n=[],r=0;return e.sort(function(e,t){return e.start-t.start}).forEach(function(e){var o=t.callNoMatchOnInvalidRanges(e,r),i=o.start,a=o.end;o.valid&&(e.start=i,e.length=a-i,n.push(e),r=a)}),n}},{key:"callNoMatchOnInvalidRanges",value:function(e,t){var n,r,o=!1;return e&&void 0!==e.start?(r=(n=parseInt(e.start,10))+parseInt(e.length,10),this.isNumeric(e.start)&&this.isNumeric(e.length)&&r-t>0&&r-n>0?o=!0:(this.log("Ignoring invalid or overlapping range: "+"".concat(JSON.stringify(e))),this.opt.noMatch(e))):(this.log("Ignoring invalid range: ".concat(JSON.stringify(e))),this.opt.noMatch(e)),{start:n,end:r,valid:o}}},{key:"checkWhitespaceRanges",value:function(e,t,n){var r,o=!0,i=n.length,a=t-i,s=parseInt(e.start,10)-a;return(r=(s=s>i?i:s)+parseInt(e.length,10))>i&&(r=i,this.log("End range automatically set to the max value of ".concat(i))),s<0||r-s<0||s>i||r>i?(o=!1,this.log("Invalid range: ".concat(JSON.stringify(e))),this.opt.noMatch(e)):""===n.substring(s,r).replace(/\\s+/g,"")&&(o=!1,this.log("Skipping whitespace only range: "+JSON.stringify(e)),this.opt.noMatch(e)),{start:s,end:r,valid:o}}},{key:"getTextNodes",value:function(e){var t=this,n="",r=[];this.iterator.forEachNode(NodeFilter.SHOW_TEXT,function(e){r.push({start:n.length,end:(n+=e.textContent).length,node:e})},function(e){return t.matchesExclude(e.parentNode)?NodeFilter.FILTER_REJECT:NodeFilter.FILTER_ACCEPT},function(){e({value:n,nodes:r})})}},{key:"matchesExclude",value:function(e){return i.matches(e,this.opt.exclude.concat(["script","style","title","head","html"]))}},{key:"wrapRangeInTextNode",value:function(e,t,n){var r=this.opt.element?this.opt.element:"mark",o=e.splitText(t),i=o.splitText(n-t),a=document.createElement(r);return a.setAttribute("data-markjs","true"),this.opt.className&&a.setAttribute("class",this.opt.className),a.textContent=o.textContent,o.parentNode.replaceChild(a,o),i}},{key:"wrapRangeInMappedTextNode",value:function(e,t,n,r,o){var i=this;e.nodes.every(function(a,s){var c=e.nodes[s+1];if(void 0===c||c.start>t){if(!r(a.node))return!1;var u=t-a.start,l=(n>a.end?a.end:n)-a.start,h=e.value.substr(0,a.start),f=e.value.substr(l+a.start);if(a.node=i.wrapRangeInTextNode(a.node,u,l),e.value=h+f,e.nodes.forEach(function(t,n){n>=s&&(e.nodes[n].start>0&&n!==s&&(e.nodes[n].start-=l),e.nodes[n].end-=l)}),n-=l,o(a.node.previousSibling,a.start),!(n>a.end))return!1;t=a.end}return!0})}},{key:"wrapGroups",value:function(e,t,n,r){return r((e=this.wrapRangeInTextNode(e,t,t+n)).previousSibling),e}},{key:"separateGroups",value:function(e,t,n,r,o){for(var i=t.length,a=1;a<i;a++){var s=e.textContent.indexOf(t[a]);t[a]&&s>-1&&r(t[a],e)&&(e=this.wrapGroups(e,s,t[a].length,o))}return e}},{key:"wrapMatches",value:function(e,t,n,r,o){var i=this,a=0===t?0:t+1;this.getTextNodes(function(t){t.nodes.forEach(function(t){var o;for(t=t.node;null!==(o=e.exec(t.textContent))&&""!==o[a];){if(i.opt.separateGroups)t=i.separateGroups(t,o,a,n,r);else{if(!n(o[a],t))continue;var s=o.index;if(0!==a)for(var c=1;c<a;c++)s+=o[c].length;t=i.wrapGroups(t,s,o[a].length,r)}e.lastIndex=0}}),o()})}},{key:"wrapMatchesAcrossElements",value:function(e,t,n,r,o){var i=this,a=0===t?0:t+1;this.getTextNodes(function(t){for(var s;null!==(s=e.exec(t.value))&&""!==s[a];){var c=s.index;if(0!==a)for(var u=1;u<a;u++)c+=s[u].length;var l=c+s[a].length;i.wrapRangeInMappedTextNode(t,c,l,function(e){return n(s[a],e)},function(t,n){e.lastIndex=n,r(t)})}o()})}},{key:"wrapRangeFromIndex",value:function(e,t,n,r){var o=this;this.getTextNodes(function(i){var a=i.value.length;e.forEach(function(e,r){var s=o.checkWhitespaceRanges(e,a,i.value),c=s.start,u=s.end;s.valid&&o.wrapRangeInMappedTextNode(i,c,u,function(n){return t(n,e,i.value.substring(c,u),r)},function(t){n(t,e)})}),r()})}},{key:"unwrapMatches",value:function(e){for(var t=e.parentNode,n=document.createDocumentFragment();e.firstChild;)n.appendChild(e.removeChild(e.firstChild));t.replaceChild(n,e),this.ie?this.normalizeTextNode(t):t.normalize()}},{key:"normalizeTextNode",value:function(e){if(e){if(3===e.nodeType)for(;e.nextSibling&&3===e.nextSibling.nodeType;)e.nodeValue+=e.nextSibling.nodeValue,e.parentNode.removeChild(e.nextSibling);else this.normalizeTextNode(e.firstChild);this.normalizeTextNode(e.nextSibling)}}},{key:"markRegExp",value:function(e,t){var n=this;this.opt=t,this.log('Searching with expression "'.concat(e,'"'));var r=0,o="wrapMatches";this.opt.acrossElements&&(o="wrapMatchesAcrossElements"),this[o](e,this.opt.ignoreGroups,function(e,t){return n.opt.filter(t,e,r)},function(e){r++,n.opt.each(e)},function(){0===r&&n.opt.noMatch(e),n.opt.done(r)})}},{key:"mark",value:function(e,t){var n=this;this.opt=t;var r=0,o="wrapMatches",i=this.getSeparatedKeywords("string"==typeof e?[e]:e),s=i.keywords,c=i.length;this.opt.acrossElements&&(o="wrapMatchesAcrossElements"),0===c?this.opt.done(r):function e(t){var i=new a(n.opt).create(t),u=0;n.log('Searching with expression "'.concat(i,'"')),n[o](i,1,function(e,o){return n.opt.filter(o,t,r,u)},function(e){u++,r++,n.opt.each(e)},function(){0===u&&n.opt.noMatch(t),s[c-1]===t?n.opt.done(r):e(s[s.indexOf(t)+1])})}(s[0])}},{key:"markRanges",value:function(e,t){var n=this;this.opt=t;var r=0,o=this.checkRanges(e);o&&o.length?(this.log("Starting to mark with the following ranges: "+JSON.stringify(o)),this.wrapRangeFromIndex(o,function(e,t,r,o){return n.opt.filter(e,t,r,o)},function(e,t){r++,n.opt.each(e,t)},function(){n.opt.done(r)})):this.opt.done(r)}},{key:"unmark",value:function(e){var t=this;this.opt=e;var n=this.opt.element?this.opt.element:"*";n+="[data-markjs]",this.opt.className&&(n+=".".concat(this.opt.className)),this.log('Removal selector "'.concat(n,'"')),this.iterator.forEachNode(NodeFilter.SHOW_ELEMENT,function(e){t.unwrapMatches(e)},function(e){var r=i.matches(e,n),o=t.matchesExclude(e);return!r||o?NodeFilter.FILTER_REJECT:NodeFilter.FILTER_ACCEPT},this.opt.done)}},{key:"opt",set:function(e){this._opt=o({},{element:"",className:"",exclude:[],iframes:!1,iframesTimeout:5e3,separateWordSearch:!0,acrossElements:!1,ignoreGroups:0,each:function(){},noMatch:function(){},filter:function(){return!0},done:function(){},debug:!1,log:window.console},e)},get:function(){return this._opt}},{key:"iterator",get:function(){return new i(this.ctx,this.opt.iframes,this.opt.exclude,this.opt.iframesTimeout)}}]),n}();return function(e){var t=this,n=new s(e);return this.mark=function(e,r){return n.mark(e,r),t},this.markRegExp=function(e,r){return n.markRegExp(e,r),t},this.markRanges=function(e,r){return n.markRanges(e,r),t},this.unmark=function(e){return n.unmark(e),t},this}});

                       </script>

                    </head>""";
    // This is a string format, and it takes a variable name as an argument to pass to the markInstance.markRegExp() Javascript method.
    private static final String JS_MARK_REG_EXP_CALLBACK =
            """
            {done: function(){
                markInstance.markRegExp(%s);}
            }""";

    // This is a string format, and it takes a variable name as an argument to pass to the markInstance.unmark() Javascript method.
    private static final String JS_UNMARK_WITH_CALLBACK =
            """
            var markInstance = new Mark(document.getElementById("content"));
            markInstance.unmark(%s);""";
    private static final Pattern UNESCAPED_FORWARD_SLASH = Pattern.compile("(?<!\\\\)/");

    private final ClipBoardManager clipBoardManager;
    private final DialogService dialogService;

    private final TaskExecutor taskExecutor = Globals.TASK_EXECUTOR;
    private final WebView previewView;
    private PreviewLayout layout;

    /**
     * The entry currently shown
     */
    private Optional<BibEntry> entry = Optional.empty();
    private Optional<Pattern> searchHighlightPattern = Optional.empty();

    private final BibDatabaseContext database;
    private boolean registered;

    private final ChangeListener<Optional<SearchQuery>> listener = (queryObservable, queryOldValue, queryNewValue) -> {
        searchHighlightPattern = queryNewValue.flatMap(SearchQuery::getJavaScriptPatternForWords);
        highlightSearchPattern();
    };

    /**
     * @param database Used for resolving strings and pdf directories for links.
     */
    public PreviewViewer(BibDatabaseContext database,
                         DialogService dialogService,
                         StateManager stateManager,
                         ThemeManager themeManager) {
        this.database = Objects.requireNonNull(database);
        this.dialogService = dialogService;
        this.clipBoardManager = Globals.getClipboardManager();

        setFitToHeight(true);
        setFitToWidth(true);
        previewView = WebViewStore.get();
        setContent(previewView);
        previewView.setContextMenuEnabled(false);

        previewView.getEngine().getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> {

            if (newValue != Worker.State.SUCCEEDED) {
                return;
            }
            if (!registered) {
                stateManager.activeSearchQueryProperty().addListener(listener);
                registered = true;
            }
            highlightSearchPattern();

            // https://stackoverflow.com/questions/15555510/javafx-stop-opening-url-in-webview-open-in-browser-instead
            NodeList anchorList = previewView.getEngine().getDocument().getElementsByTagName("a");
            for (int i = 0; i < anchorList.getLength(); i++) {
                Node node = anchorList.item(i);
                EventTarget eventTarget = (EventTarget) node;
                eventTarget.addEventListener("click", evt -> {
                    EventTarget target = evt.getCurrentTarget();
                    HTMLAnchorElement anchorElement = (HTMLAnchorElement) target;
                    String href = anchorElement.getHref();
                    if (href != null) {
                        try {
                            JabRefDesktop.openBrowser(href);
                        } catch (MalformedURLException exception) {
                            LOGGER.error("Invalid URL", exception);
                        } catch (IOException exception) {
                            LOGGER.error("Invalid URL Input", exception);
                        }
                    }
                    evt.preventDefault();
                }, false);
            }
        });

        themeManager.installCss(previewView.getEngine());
    }

    private void highlightSearchPattern() {
        String callbackForUnmark = "";
        if (searchHighlightPattern.isPresent()) {
            String javaScriptRegex = createJavaScriptRegex(searchHighlightPattern.get());
            callbackForUnmark = String.format(JS_MARK_REG_EXP_CALLBACK, javaScriptRegex);
        }
        String unmarkInstance = String.format(JS_UNMARK_WITH_CALLBACK, callbackForUnmark);
        previewView.getEngine().executeScript(unmarkInstance);
    }

    /**
     * Returns the String representation of a JavaScript regex object. The method does not take into account differences between the regex implementations in Java and JavaScript.
     *
     * @param regex Java regex to print as a JavaScript regex
     * @return JavaScript regex object
     */
    private static String createJavaScriptRegex(Pattern regex) {
        String pattern = regex.pattern();
        // Create a JavaScript regular expression literal (https://ecma-international.org/ecma-262/10.0/index.html#sec-literals-regular-expression-literals)
        // Forward slashes are reserved to delimit the regular expression body. Hence, they must be escaped.
        pattern = UNESCAPED_FORWARD_SLASH.matcher(pattern).replaceAll("\\\\/");
        return "/" + pattern + "/gmi";
    }

    public void setLayout(PreviewLayout newLayout) {
        // Change listeners might set the layout to null while the update method is executing, therefore we need to prevent this here
        if (newLayout == null) {
            return;
        }
        layout = newLayout;
        update();
    }

    public void setEntry(BibEntry newEntry) {
        // Remove update listener for old entry
        entry.ifPresent(oldEntry -> {
            for (Observable observable : oldEntry.getObservables()) {
                observable.removeListener(this);
            }
        });

        entry = Optional.of(newEntry);

        // Register for changes
        for (Observable observable : newEntry.getObservables()) {
            observable.addListener(this);
        }
        update();
    }

    private void update() {
        if (entry.isEmpty() || (layout == null)) {
            // Make sure that the preview panel is not completely white, especially with dark theme on
            setPreviewText("");
            return;
        }

        Number.serialExportNumber = 1; // Set entry number in case that is included in the preview layout.

        BackgroundTask
                .wrap(() -> layout.generatePreview(entry.get(), database))
                .onRunning(() -> setPreviewText("<i>" + Localization.lang("Processing %0", Localization.lang("Citation Style")) + ": " + layout.getDisplayName() + " ..." + "</i>"))
                .onSuccess(this::setPreviewText)
                .onFailure(exception -> {
                    LOGGER.error("Error while generating citation style", exception);
                    setPreviewText(Localization.lang("Error while generating citation style"));
                })
                .executeWith(taskExecutor);
    }

    private void setPreviewText(String text) {
        String myText = String.format("""
                <html>
                    %s
                    <body id="previewBody">
                        <div id="content"> %s </div>
                    </body>
                </html>
                """, JS_HIGHLIGHT_FUNCTION, text);
        previewView.getEngine().setJavaScriptEnabled(true);
        previewView.getEngine().loadContent(myText);

        this.setHvalue(0);
    }

    public void print() {
        PrinterJob job = PrinterJob.createPrinterJob();
        boolean proceed = dialogService.showPrintDialog(job);
        if (!proceed) {
            return;
        }

        BackgroundTask
                .wrap(() -> {
                    job.getJobSettings().setJobName(entry.flatMap(BibEntry::getCitationKey).orElse("NO ENTRY"));
                    previewView.getEngine().print(job);
                    job.endJob();
                })
                .onFailure(exception -> dialogService.showErrorDialogAndWait(Localization.lang("Could not print preview"), exception))
                .executeWith(taskExecutor);
    }

    public void copyPreviewToClipBoard() {
        Document document = previewView.getEngine().getDocument();

        ClipboardContent content = new ClipboardContent();
        content.putString(document.getElementById("content").getTextContent());
        content.putHtml((String) previewView.getEngine().executeScript("document.documentElement.outerHTML"));

        clipBoardManager.setContent(content);
    }

    public void copySelectionToClipBoard() {
        ClipboardContent content = new ClipboardContent();
        content.putString(getSelectionTextContent());
        content.putHtml(getSelectionHtmlContent());

        clipBoardManager.setContent(content);
    }

    @Override
    public void invalidated(Observable observable) {
        update();
    }

    public String getSelectionTextContent() {
        return (String) previewView.getEngine().executeScript("window.getSelection().toString()");
    }

    public String getSelectionHtmlContent() {
        return (String) previewView.getEngine().executeScript(JS_GET_SELECTION_HTML_SCRIPT);
    }
}
