// ==UserScript==
// @name     Google Groups Wiktionary Citation
// @version  1
// @include https://groups.google.com/*
// ==/UserScript==

// Set to true if you wish to only see Usenet results in searches; by default it only highlights them as red
var HIDE_NON_USENET = false;

function displayCitationGroups() {

    var textarea = document.createElement('textarea');
    textarea.setAttribute('rows', 10);
    textarea.setAttribute('cols', 50);

    var button = document.createElement('button');
    var buttonText = document.createTextNode("[minify]");
    button.appendChild(buttonText);
    button.onclick = minify;

    var s = this.closest("section");

    var title = this.closest(".RBM0ic").getElementsByClassName("ThqSJd");
    title = title && title[0].textContent.trim();

    var author = s.getElementsByClassName("s1f8Zd");
    author = author && author[0].textContent.trim();

    var date = s.getElementsByClassName("zX2W9c");
    date = date && date[0].textContent.trim();
    date = date.replace(/\s+\(.*/, "");

    var passage = s.getElementsByClassName("ptW7te");
    passage = passage && passage[0].innerText.replace(/^cite\b/, "").trim().replace(/\n+/g, "<br>");

    var target = window.location.href.replace(/\/m\/.*/, "/");
    target += "m/" + s.getAttribute("data-doc-id");

    var group = target.match(/\/g\/(.*?)\//);
    group = group && group[1]

    var citation = "{{quote-newsgroup|en" +
        (target && ("\n|url=" + target) || "") +
        (title && ("\n|title=" + title) || "") +
        (group && ("\n|group=" + group) || "") +
        (author && ("\n|author=" + author) || "") +
        (date && ("\n|date=" + date) || "") +
        (passage && ("\n|passage=" + passage) || "") +
        "\n}}";
    textarea.value = citation;

    var d = s.getElementsByClassName("ptW7te")[0];
    d.prepend(button);
    d.prepend(textarea);
    return 0;
}

function addButton() {
    var d = document.getElementsByClassName("ptW7te");

    for (var i = 0; i < d.length; i++) {
        if (d[i].getElementsByClassName("wikt-cite").length == 0) {
            d[i].innerHTML = "<button class=\"wikt-cite\">cite</button><br>" + d[i].innerHTML;
            document.getElementsByClassName("wikt-cite")[i].onclick = displayCitationGroups;
        }
    }
}

function removeClass(c) {
    while (document.getElementsByClassName(c).length != 0) {
        var el = document.getElementsByClassName(c)[0];
        var color = window.getComputedStyle(el).getPropertyValue("color");
        el.classList.remove(c);
        el.style.color = color;
    }
}

function highlightUsenet() {
    var elements = document.getElementsByClassName("dkj3H");
    for (var i = 0; i < elements.length; i++) {
        var isUsenet = elements[i].textContent.trim().match(/[a-z0-9-+_]+(\.[a-z0-9-+_]+)+/);
        elements[i].style.color = isUsenet && "red" || "grey";
        if (HIDE_NON_USENET && !isUsenet) {
            elements[i].closest(".cXEmmc").style.display = "none";
        }
    }
}

function minify() {
    var textarea = this.parentNode.getElementsByTagName('textarea')[0];
    textarea.value = textarea.value.replace(/\n/g, "");
}

function misc() {
    removeClass("iBQX0d");
    removeClass("WzoK");
    highlightUsenet();
    addButton();
}

misc();
var observer = new MutationObserver(misc);
observer.observe(document.body, {
    childList: true,
    subtree: true,
    attributes: true,
    characterData: true
});