// ==UserScript==
// @name         MeFi Neater Bylines
// @namespace    https://github.com/klipspringr/mefi-userscripts
// @version      2025-08-29-a
// @description  MetaFilter: neaten up comment bylines
// @author       Klipspringer
// @supportURL   https://github.com/klipspringr/mefi-userscripts
// @license      MIT
// @match        *://*.metafilter.com/*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @downloadURL  https://raw.githubusercontent.com/klipspringr/mefi-userscripts/main/mefi-replace-quote-label.user.js
// @updateURL    https://raw.githubusercontent.com/klipspringr/mefi-userscripts/main/mefi-replace-quote-label.user.js
// ==/UserScript==

;(async () => {
    "use strict"

    if (
        !/^\/(\d|comments\.mefi)/.test(window.location.pathname) ||
        /rss$/.test(window.location.pathname)
    )
        return

    const KEY_CUSTOM_LABEL = "custom-quote-button-label"
    const SVG_REPLY = `<svg xmlns="http://www.w3.org/2000/svg" hidden style="display:none"><path id="mrql-reply" fill="currentColor" d="M 69.941 48.117 C 72.437 48.117 74.776 47.63 76.959 46.657 C 79.142 45.684 81.043 44.37 82.66 42.715 C 84.279 41.06 85.555 39.134 86.491 36.934 C 87.427 34.735 87.894 32.39 87.894 29.898 C 87.894 27.406 87.427 25.071 86.491 22.891 C 85.555 20.711 84.279 18.803 82.66 17.169 C 81.043 15.532 79.142 14.248 76.959 13.314 C 74.776 12.379 72.437 11.912 69.941 11.912 L 68.071 12.087 L 68.071 0 L 69.941 0 C 74.074 0 77.963 0.779 81.608 2.336 C 85.253 3.892 88.441 6.024 91.169 8.729 C 93.899 11.435 96.053 14.608 97.632 18.249 C 99.211 21.888 100 25.772 100 29.898 C 100 34.025 99.211 37.908 97.632 41.548 C 96.053 45.187 93.899 48.37 91.169 51.095 C 88.441 53.82 85.253 55.972 81.608 57.548 C 77.963 59.125 74.074 59.913 69.941 59.913 L 23.626 59.913 L 44.036 80 L 27.953 80 L 0 53.723 L 27.953 28.028 L 44.036 28.028 L 23.626 48.117 L 69.941 48.117 Z" /></svg>`
    const SVG_USE_REPLY = `<svg xmlns="http://www.w3.org/2000/svg" width="1em" viewBox="0 0 100 100" style="vertical-align:middle"><use href="#mrql-reply" /></svg>`

    const getSetting = async (key, def = "") => {
        const value = await GM_getValue(key, def)
        return String(value)
    }

    const handleEditLabel = async () => {
        const existing = await GM_getValue(KEY_CUSTOM_LABEL, "")
        const edited = prompt(
            "Quote button label (leave blank for reply arrow):",
            String(existing)
        )
        await GM_setValue(KEY_CUSTOM_LABEL, edited || "")
        await modifyQuoteButtons()
    }

    GM_registerMenuCommand("Edit quote button", handleEditLabel)

    const modifyQuoteButtons = async () => {
        const start = performance.now()

        const customLabel = await getSetting(KEY_CUSTOM_LABEL, "")
        const label = customLabel || SVG_USE_REPLY

        const nodes = document.querySelectorAll("a.quotebutton")

        nodes.forEach((node) => {
            // replace quote button content
            node.innerHTML = label

            if (node.hasAttribute("data-mrql-moved")) return

            // move quote button to before flag button
            node.parentNode.parentNode
                .querySelector("span[id^='flag']")
                ?.before(node.parentNode)

            // mark as done so we don't pick this up again
            node.setAttribute("data-mrql-moved", "")
        })

        console.log(
            "mefi-replace-quote-label",
            nodes.length,
            Math.round(performance.now() - start) + "ms"
        )
    }

    document.body.insertAdjacentHTML("beforeend", SVG_REPLY)

    // MefiQuote listens for the "mefi-comments" event, but:
    //    (a) my event listener wasn't picking that up for some reason; and
    //    (b) there could be timing issues as MefiQuote needs to complete its work first
    // hence using MutationObserver instead.
    const newCommentsElement = document.getElementById("newcomments")
    if (newCommentsElement) {
        const observer = new MutationObserver(() => modifyQuoteButtons())
        observer.observe(newCommentsElement, { childList: true })
    }

    modifyQuoteButtons()
})()