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LC Random Bookmark Picker

Randomly picks a bookmark from your LC bookmark page. Just press the 'Random' button.

// ==UserScript==
// @name         LC Random Bookmark Picker
// @namespace    1330126-edexal
// @license      Unlicense
// @version      1.1.2
// @description  Randomly picks a bookmark from your LC bookmark page. Just press the 'Random' button.
// @author       Edexal
// @match        *://lewdcorner.com/account/bookmarks*
// @icon         https://external-content.duckduckgo.com/ip3/lewdcorner.com.ico
// @grant        none
// ==/UserScript==
(() => {
    const BOOKMARK_QUERY = 'bmpos';
    //Apply custom styles in a style tag
    function applyCSS(css) {
        let styleEl = document.querySelector("style");
        if (styleEl === null) {
            styleEl = document.createElement('style');
        }
        styleEl.appendChild(document.createTextNode(css));
        document.head.appendChild(styleEl);
    }

    //CSS styles
    let stylesCSS = (`
		#randbtn{
			color:yellow;
			border: 1px solid #343638;

		}
		#randbtn:hover{
			cursor: pointer;
			opacity: 0.7;
		}
		#randbtn:active{
			background-color: #ec5555;
		}
		#chosen{
			color: yellow;
			text-shadow: #cc0000 1px 0 8px;
      display:inherit !important;
		}
    #randContainer{
      margin-top:20px;
    }
	`);

    function getRandIntInc(min, max) {
        //Inclusive random number generator
        return Math.floor(Math.random() * (max - min + 1) ) + min;
    }

    function highlightBookmarkChoice(){
        if(!location.search.includes(BOOKMARK_QUERY)) {
            return;
        }
        let newURL = location.href.substring(0,
                                             location.search.includes('&'+BOOKMARK_QUERY) !== -1 ? location.href.indexOf('&'+BOOKMARK_QUERY) : location.href.indexOf(BOOKMARK_QUERY));// removes '&bmpos'  or 'bmpos' from URL
        history.replaceState({},"",newURL); //Change the URL to one w/o 'bmpos' query param

        let bookmarkListEl = document.querySelector("ol.listPlain");

        let randBookmarkPos = getRandIntInc(0,bookmarkListEl.children.length - 1);// Pick a random bookmark position (usually 0-19, total 20)
        let chosenBookmarkEl = bookmarkListEl.children[randBookmarkPos];
        chosenBookmarkEl.id = "chosen";
        chosenBookmarkEl.scrollIntoView(false); //scroll selected bookmark into view from the bottom of the page
    }
    highlightBookmarkChoice();

    let randBtn = document.createElement('button');
    //Prepare button attributes
    randBtn.setAttribute("name","random");
    randBtn.setAttribute("type","button");
    randBtn.id = "randbtn";
    //F95zone style classes
    randBtn.classList.add("pageNav-jump","pageNav-jump--next");

    //Prepare button text
    let randTxt = document.createTextNode('Random');
    randBtn.appendChild(randTxt);

    //Pick bookmark from a selection of all pages
    function pickRandomBookmark(){
        let pagination = document.querySelector("ul.pageNav-main");//Select pagination
        let lastPageNum = pagination.children[pagination.children.length-1].children[0].textContent;//Get the last page number of the pagination
        let randPageChoiceNum = getRandIntInc(1,Number(lastPageNum));//Pick a random page number
        let curURL = new URL(location.href);//Get the current URL
        curURL.searchParams.set("page",randPageChoiceNum);//Customize URL to point to the randomly chosen page number

        //Customize URL to add bookmark query parameter
        curURL.searchParams.set("bmpos",1);

        //Go To randomly chosen bookmark page
        location.replace(curURL.toString());
    }

    //Pick bookmark on the first page (if 1 page is only available)
    function pickRandBookmarkOne() {
        let curURL = new URL(location.href);//Get the current URL
        curURL.searchParams.set("page",1);//Customize URL to point to the randomly chosen page number

        //Customize URL to add bookmark query parameter
        curURL.searchParams.set("bmpos",1);

        //Go To randomly chosen bookmark page
        location.replace(curURL.toString());
    }

    //Add button to F95
    let entirePaginationEl = document.querySelector("nav > div.pageNav");
    //Checks if there is only a single page of bookmarks or more
    if(!!entirePaginationEl){
        // > 1
      let isPageNavVisible = window.getComputedStyle(document.querySelector(".pageNavWrapper--mixed .pageNav")).getPropertyValue("display") === "none";
      if(isPageNavVisible){
        //Mobile Pagination (w/ arrows)
          let randContainerEl = document.createElement("div");
          randContainerEl.id = "randContainer";
          randContainerEl.appendChild(randBtn);
          let pageArrowsEl = document.querySelector(".block-outer--after");
          pageArrowsEl.appendChild(randContainerEl);
      }else{
        //Desktop Pagination
        entirePaginationEl.appendChild(randBtn);
      }
      randBtn.addEventListener("click", pickRandomBookmark);

    }else{
        // == 1
        document.querySelector("#top > div.p-body").append(randBtn);
        randBtn.addEventListener("click", pickRandBookmarkOne);
		stylesCSS = stylesCSS + `
		#randbtn {
			position:relative;
			left: 50%;
			width:150px;
			height:40px;
			font-size: 16px;
			border: 1pt inset navajowhite;
			box-shadow: 0 1px 5px #988787;
			border-radius: 50px;
		}
		`;
    }
    applyCSS(stylesCSS);

})();