// ==UserScript==
// @name         Remote Instance Actions
// @namespace    https://hollymcfarland.com
// @version      1.0
// @description  Easily limit a remote instance from your Mastodon instance via the timeline
// @author       monorail
<?php
    foreach ($_GET["instances"] as $instance) {
        echo "// @match        https://*.{$instance}/web/*" . PHP_EOL;
    }
?>
// @grant        GM_openInTab
// @run-at       context-menu
// ==/UserScript==

(function() {
    'use strict';

    // Check whether the domain is already limited on the instance, and open the relevant form if not
    // This is imperfect, it just does a search of limited domains in the admin backend
    // This means it handles substrings weirdly, and interacts weirdly with suspending subdomains
    // But there's an override so it's not so bad
    function checkStatus(domain, callback) {
        let url = `https://${window.location.host}/admin/instances?utf8=%E2%9C%93&limited=1&by_domain=${domain}`;
        let request = new XMLHttpRequest();
        request.open('GET', url);

        request.addEventListener('load', function() {
            if (request.response.includes("You don&#39;t have permission to view this page.")) {
                alert("You are not logged in to an administrator account.");
                return;
            }
            if (request.response.includes("No domains found.") || confirm(`${domain} may already be limited. Continue anyway?`)) {
                callback(domain);
            }
        });

        request.send();
    }

    // Open a new tab to the form for applying moderation actions to the selected domain
    function newBlock(domain) {
        GM_openInTab(`https://${window.location.host}/admin/domain_blocks/new?_domain=${domain}`, false);
    }

    // Clean up the selected domain
    function sanitize(domain) {
        // clear out accidental whitespace
        domain = domain.trim();

        // in case a full link was provided
        domain = domain.replace(/https?:\/\//, "");

        // in case the domain is being copied from a user@domain string
        domain = domain.split("@").slice(-1)[0];

        // in case the domain has a path included
        domain = domain.split("/")[0];

        return domain;
    }

    // Make sure a domain was actually selected
    // This is imperfect, but can be overridden in case of a false negative
    function validate(domain) {
        // For now just check for a domain + tld and no whitespace
        return domain.includes(".") && !domain.match(/\s/);
    }

    let domain = sanitize(document.getSelection().toString());
    if (!domain.trim()) {
        alert("Nothing selected.");
        return;
    }

    if (validate(domain) || confirm(`Are you sure you meant to select "${domain}"?`)) {
        checkStatus(domain, newBlock);
    }
})();