/* Flying Pages | (c) gijo-varghese https://github.com/gijo-varghese/flying-pages */
(function(global,factory){global.pprhFlyingPages=factory()}(this,function(){const toPrefetch=new Set();const alreadyPrefetched=new Set();const prefetcher=document.createElement("link");const isSupported=prefetcher.relList&&prefetcher.relList.supports&&prefetcher.relList.supports("prefetch")&&window.IntersectionObserver&&"isIntersecting"in IntersectionObserverEntry.prototype;const isSlowConnection=navigator.connection&&(navigator.connection.saveData||(navigator.connection.effectiveType||"").includes("2g"));var prefetchCount=0;var fp_data;let hoverTimer=null;const prefetch=url=>new Promise((resolve,reject)=>{const link=document.createElement('link');link.rel='prefetch';link.href=url;link.onload=resolve;link.onerror=reject;document.head.appendChild(link);if(fp_data.testing){console.log(link)}});const prefetchWithTimeout=url=>{const timer=setTimeout(()=>stopPrefetching(),5000);prefetch(url).catch(()=>stopPrefetching()).finally(()=>clearTimeout(timer))};function isUrlValid(url){const origin=window.location.origin;const currentPage=origin+document.location.pathname;return!((alreadyPrefetched.has(url)||toPrefetch.has(url))||(prefetchCount>=fp_data.maxPrefetches)||(url.substring(0,origin.length)!==origin)||(currentPage===url))}const addUrlToQueue=(url,processImmediately=false)=>{if(!isUrlValid(url)){return false}for(let i=0;i<fp_data.ignoreKeywords.length;i+=1){let keyword=fp_data.ignoreKeywords[i];if(keyword.length>0&&url.includes(keyword)){return false}else if(keyword.endsWith("*")){let pattern=keyword.split("*")[0];if(url.indexOf(pattern)>=0){let fragment=url.split(pattern)[1];if(""!==fragment){return false}}}}if(processImmediately){prefetchWithTimeout(url);alreadyPrefetched.add(url)}else{toPrefetch.add(url)}prefetchCount+=1;return true};const linksObserver=new IntersectionObserver(entries=>{entries.forEach(entry=>{if(entry.isIntersecting){const url=entry.target.href;addUrlToQueue(url,!fp_data.maxRPS)}})});const startQueue=()=>setInterval(()=>{Array.from(toPrefetch).slice(0,fp_data.maxRPS).forEach(url=>{prefetchWithTimeout(url);alreadyPrefetched.add(url);toPrefetch.delete(url)})},1000);const mouseOverListener=event=>{const elm=event.target.closest("a");if(elm&&elm.href&&!alreadyPrefetched.has(elm.href)){hoverTimer=setTimeout(()=>{addUrlToQueue(elm.href,true)},fp_data.hoverDelay)}};const touchStartListener=event=>{const elm=event.target.closest("a");if(elm&&elm.href&&!alreadyPrefetched.has(elm.href)){addUrlToQueue(elm.href,true)}};const mouseOutListener=event=>{const elm=event.target.closest("a");if(elm&&elm.href&&!alreadyPrefetched.has(elm.href)){clearTimeout(hoverTimer)}};const requestIdleCallback=window.requestIdleCallback||function(cb){const start=Date.now();return setTimeout(function(){cb({didTimeout:false,timeRemaining:function(){return Math.max(0,50-(Date.now()-start))}})},1)};const stopPrefetching=()=>{document.querySelectorAll("a").forEach(e=>linksObserver.unobserve(e));toPrefetch.clear();document.removeEventListener("mouseover",mouseOverListener,true);document.removeEventListener("mouseout",mouseOutListener,true);document.removeEventListener("touchstart",touchStartListener,true)};const listenerOptions={capture:true,passive:true};document.addEventListener("mouseover",mouseOverListener,listenerOptions);document.addEventListener("mouseout",mouseOutListener,listenerOptions);document.addEventListener("touchstart",touchStartListener,listenerOptions);function get_Fp_data(){return{maxRPS:3,delay:0,hoverDelay:50,ignoreKeywords:[],maxPrefetches:10,testing:false}}function init(pprh_fp_data){let ignoreKeywords;if(typeof pprh_fp_data==="undefined"){pprh_fp_data=get_Fp_data()}if(Array.isArray(pprh_fp_data.ignoreKeywords)){ignoreKeywords=pprh_fp_data.ignoreKeywords.map((keyword)=>keyword.replace(/[\s|\\'<>^\\"]/g,''))}fp_data={maxRPS:Number(pprh_fp_data.maxRPS),delay:Number(pprh_fp_data.delay),hoverDelay:Number(pprh_fp_data.hoverDelay),ignoreKeywords:ignoreKeywords,testing:('true'===pprh_fp_data.testing),maxPrefetches:Number(pprh_fp_data.maxPrefetches)};if(!fp_data.testing&&(isSlowConnection||!isSupported)){return}startQueue();requestIdleCallback(()=>setTimeout(()=>document.querySelectorAll("a").forEach(e=>linksObserver.observe(e)),fp_data.delay*1000))}return{AddUrlToQueue:addUrlToQueue,Init:init}}));if(typeof module==="object"){module.exports=this.pprhFlyingPages}else{pprhFlyingPages.Init(pprh_fp_data)}