// ==UserScript==
// @name         NSFW Board Remover & 4chan AMOLED Black
// @namespace    https://github.com/deactivated0
// @version      4.2
// @description  AMOLED dark mode with full black footer navigation, black buttons, and automated NSFW redirection.
// @author       deactivated0
// @match        https://*.4chan.org/*
// @match        https://*.4channel.org/*
// @run-at       document-start
// @grant        none
// @updateURL    https://raw.githubusercontent.com/deactivated0/4chan-amoled-black/main/4chan.user.js
// @downloadURL  https://raw.githubusercontent.com/deactivated0/4chan-amoled-black/main/4chan.user.js
// ==/UserScript==

(function () {
    'use strict';

    const BLOCKED_BOARDS = new Set([
        "b", "r9k", "pol", "bant", "soc", "s4s", "s", "hc",
        "hm", "h", "e", "u", "d", "y", "t", "hr", "gif", "aco"
    ]);

    function currentBoard() {
        const m = location.pathname.match(/^\/([^/]+)/);
        return m ? m[1] : "";
    }

    // 1. Immediate Redirection Check
    if (BLOCKED_BOARDS.has(currentBoard())) {
        window.location.replace("https://www.4chan.org/");
        return;
    }

    // 2. Optimized Consolidated AMOLED & Black Footer CSS
    const themeCSS = `
        :root {
            --bg: #000000;
            --bg2: #050505;
            --bg3: #0a0a0a;
            --text: #ffffff;
            --text2: #cfcfcf;
            --border: #202020;
            --quote: #789922;
            --highlight: #101010;
        }

        html, body, #doc, #hd, #bd, #ft {
            background: var(--bg) !important;
            background-color: var(--bg) !important;
            color: var(--text) !important;
            color-scheme: dark !important;
        }

        * {
            scrollbar-color: #444 #000;
            border-color: var(--border) !important;
        }

        ::-webkit-scrollbar { width: 12px; height: 12px; }
        ::-webkit-scrollbar-track { background: #000; }
        ::-webkit-scrollbar-thumb { background: #444; border-radius: 8px; }

        body, div, section, article, main, aside, header, footer, nav,
        form, fieldset, table, tr, td, th {
            color: var(--text) !important;
        }

        a, a:link, .boardlink, .boardlink:link, .boardlink:visited,
        .quotelink, a.quotelink, a[href^="#p"], .subject, .name {
            color: #ffffff !important;
        }

        a:visited { color: #d0d0d0 !important; }
        a:hover, .boardlink:hover, .quotelink:hover, a.quotelink:hover {
            color: #ffffff !important;
            text-decoration: underline !important;
        }

        /* Footer Container and List Item Background Fix */
        #ft, #ft ul, #ft ul li, #ft li, #ft .fill {
            background: #000000 !important;
            background-color: #000000 !important;
            border-color: var(--border) !important;
            box-shadow: none !important;
        }

        /* Footer Link Buttons */
        #ft ul li a {
            background: #000000 !important;
            color: #ffffff !important;
            border: 1px solid var(--border) !important;
            padding: 4px 10px !important;
            border-radius: 4px !important;
            text-decoration: none !important;
            display: inline-block !important;
            transition: background 0.2s, border-color 0.2s !important;
        }

        #ft ul li a:hover {
            background: #111111 !important;
            border-color: #444444 !important;
            text-decoration: none !important;
        }

        input, textarea, select, button {
            background: var(--bg3) !important;
            color: var(--text) !important;
            border: 1px solid var(--border) !important;
            box-shadow: none !important;
        }

        input::placeholder, textarea::placeholder { color: #888 !important; }
        hr { border-color: var(--border) !important; }
        img, video, canvas, svg, #logo-fp, #logo-fp a, #logo-fp img { background: transparent !important; }

        #announce, #boards, #popular-threads, #site-stats, .box-outer,
        .box-inner, .boxbar, .boxcontent, .column, .stat-cell, .c-thread,
        .c-board, .c-teaser {
            background: var(--bg) !important;
            color: var(--text) !important;
            border-color: var(--border) !important;
            box-shadow: none !important;
        }

        .box-outer, .box-inner, .c-thread { border: 1px solid var(--border) !important; }
        .boxbar { background: var(--bg2) !important; border-bottom: 1px solid var(--border) !important; }
        .boxbar h2, .boxbar h3, #filter-btn, #opts-btn, .c-board, .c-teaser,
        .stat-cell, #copyright, #ft, #ft a { color: #fff !important; }
        .c-thread { padding: 6px !important; }

        .post, .reply, .postContainer, .thread, .postInfo, .postMessage,
        .summary, .catalog-thread, .catalog-container, .box, .extButton,
        .replyhl, .menu, .dialog, .UIPanel, .backlink, .replyPreview,
        .modal, .popup, .dropdown, .postbtn, .fileText, .fileInfo, .board,
        .boardHeader, .boardList, .boardSection, .threadList, .catalogCell {
            background: var(--bg2) !important;
            color: var(--text) !important;
            border-color: var(--border) !important;
            box-shadow: none !important;
        }

        .highlight, .reply.highlight, .reply:target { background: var(--highlight) !important; }
        .quote { color: var(--quote) !important; font-weight: 500 !important; }
        .quotelink, a.quotelink, a[href^="#p"], .subject { font-weight: 700 !important; }
        .deadlink { color: #666666 !important; }

        .posteruid, .capcode {
            background: #111 !important;
            color: #fff !important;
            border-radius: 3px !important;
            padding: 0 3px !important;
        }

        .linkname, .intro, .postNum, .posttime, .dateTime, .posterhead { color: var(--text2) !important; }
        .sage, .sage a { color: #8a8a8a !important; }
        .spoiler { background: #222 !important; color: #222 !important; }
        .spoiler:hover { color: #fff !important; }
    `;

    function injectStyle(css) {
        const style = document.createElement('style');
        style.textContent = css;
        (document.head || document.documentElement).appendChild(style);
    }

    injectStyle(themeCSS);

    // 3. Optimized DOM Cleaning Functions
    function cleanDOM() {
        document.querySelectorAll("a[href]").forEach(a => {
            try {
                const url = new URL(a.href, location.origin);
                const board = url.pathname.split("/").filter(Boolean)[0];

                if (BLOCKED_BOARDS.has(board)) {
                    const parent = a.parentNode;
                    if (parent && parent.classList.contains("boardList")) {
                        let next = a.nextSibling;
                        if (next && next.nodeType === Node.TEXT_NODE && next.textContent.includes("/")) {
                            next.textContent = next.textContent.replace(/^\s*\/|^\s*\]/, "");
                        }
                    }
                    a.remove();
                }
            } catch {}
        });

        document.querySelectorAll("option").forEach(opt => {
            const value = opt.value.replace(/^\/|\/$/g, "");
            if (BLOCKED_BOARDS.has(value)) opt.remove();
        });

        if (location.hostname.startsWith("www.")) {
            document.querySelectorAll(".column").forEach(col => {
                const headings = col.querySelectorAll("h3");
                headings.forEach(h => {
                    const title = h.textContent.trim();
                    if (title === "Misc." || title === "Adult") col.remove();
                });
            });
        }

        document.querySelectorAll(".c-thread").forEach(thread => {
            const a = thread.querySelector("a[href]");
            if (!a) return;
            try {
                const url = new URL(a.href, location.origin);
                const board = url.pathname.split("/").filter(Boolean)[0];
                if (BLOCKED_BOARDS.has(board)) thread.remove();
            } catch {}
        });
    }

    // 4. Performance-Optimized Execution Loops
    if (document.readyState === "loading") {
        document.addEventListener("DOMContentLoaded", cleanDOM);
    } else {
        cleanDOM();
    }

    let isScheduled = false;
    const observer = new MutationObserver(() => {
        if (!isScheduled) {
            isScheduled = true;
            requestAnimationFrame(() => {
                cleanDOM();
                isScheduled = false;
            });
        }
    });

    observer.observe(document.documentElement, {
        childList: true,
        subtree: true
    });

    // Navigation Interception Clicks
    document.addEventListener("click", e => {
        const a = e.target.closest("a");
        if (!a) return;

        try {
            const url = new URL(a.href, location.origin);
            const board = url.pathname.split("/").filter(Boolean)[0];

            if (BLOCKED_BOARDS.has(board)) {
                e.preventDefault();
                e.stopImmediatePropagation();
                window.location.replace("https://www.4chan.org/");
            }
        } catch {}
    }, true);

})();