// ==UserScript==
// @name         academyFIVE::AddSelectBox
// @namespace    dakp/academyfive
// @version      2026.04.006
// @description  Füge Selectbox für Kohorten/Planungsgruppen hinzu
// @author       Dims Akpan
// @match        https://a5.fhdw-hannover.de/*
// @match        https://a5.fhdw.de/*
// @match        https://fhdw.academyfive-preview.net/*
// @match        https://fhdw-hannover.academyfive-preview.net/*
// @grant        none
// @icon         https://www.academyfive.com/typo3conf/ext/sitepackage/Resources/Public/build/assets/images/favicon-academyfive.ico
// ==/UserScript==

(function() {
    'use strict';

    const LOG = '[A5-SelectBox]';

    // ─── Gemeinsame Hilfsfunktionen ───────────────────────────────────────────

    function insertSelectButtons(selectSelector) {
        const select = document.querySelector(selectSelector);
        if (!select) {
            console.log(LOG, 'select nicht gefunden:', selectSelector);
            return false;
        }

        const dropdownContainer = select.closest('.btn-group.bootstrap-select');
        if (!dropdownContainer) {
            console.log(LOG, 'closest(.btn-group.bootstrap-select) nicht gefunden');
            return false;
        }

        const searchBox = dropdownContainer.querySelector('.bs-searchbox');
        if (!searchBox) {
            console.log(LOG, '.bs-searchbox nicht gefunden im Container');
            return false;
        }

        if (searchBox.nextElementSibling?.classList.contains('bs-actionsbox')) {
            console.log(LOG, 'Buttons bereits vorhanden, überspringe');
            return true;
        }

        const actionsBox = document.createElement('div');
        actionsBox.className = 'bs-actionsbox';
        actionsBox.innerHTML = `
            <div class="btn-group btn-group-sm btn-block">
                <button type="button" class="actions-btn bs-select-all btn btn-default">Alles auswählen</button>
                <button type="button" class="actions-btn bs-deselect-all btn btn-default">Nichts auswählen</button>
            </div>
        `;

        searchBox.insertAdjacentElement('afterend', actionsBox);
        console.log(LOG, 'Buttons erfolgreich eingefügt für:', selectSelector);
        return true;
    }

    function waitAndInsert(tryFn) {
        console.log(LOG, 'waitAndInsert gestartet | readyState:', document.readyState, '| URL:', window.location.href);

        if (tryFn()) return;

        console.log(LOG, 'Erster Versuch fehlgeschlagen, starte Observer + Polling');

        const observer = new MutationObserver(() => {
            if (tryFn()) {
                console.log(LOG, 'Observer: Buttons eingefügt, Observer beendet');
                observer.disconnect();
            }
        });

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

        let attempts = 0;
        const poll = setInterval(() => {
            attempts++;
            if (tryFn()) {
                console.log(LOG, 'Polling: Buttons eingefügt nach', attempts, 'Versuchen');
                clearInterval(poll);
            } else if (attempts >= 50) {
                console.log(LOG, 'Polling: Timeout nach 50 Versuchen');
                clearInterval(poll);
                observer.disconnect();
            }
        }, 100);
    }

    // ─── /course/list ─────────────────────────────────────────────────────────

    function courseList_tryInsert() {
        return insertSelectButtons('select[name="planningGroupIds[]"]');
    }

    function courseList_init() {
        waitAndInsert(courseList_tryInsert);
    }

    // ─── /course/planning-group/list ──────────────────────────────────────────

    function planningGroupList_tryInsert() {
        return insertSelectButtons('select[name="cohort-ids[]"]');
    }

    function planningGroupList_init() {
        waitAndInsert(planningGroupList_tryInsert);
    }

    // ─── Routing ──────────────────────────────────────────────────────────────

    function init() {
        const url = window.location.href;
        console.log(LOG, 'init() | URL:', url);

        if (url.includes('/course/planning-group/list')) {
            planningGroupList_init();
        } else if (url.includes('/course/list')) {
            courseList_init();
        } else {
            console.log(LOG, 'URL passt zu keiner bekannten Seite, Script inaktiv');
        }
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();