// Loaded by normal Hub pages; dormant when the remote feature is disabled.
(async () => {
    if (/^\/sag\/\d+\/v5\/?$/.test(location.pathname)) return;
    const {api, bootstrap, requestId} = await import('/static/js/remote-api.js');
    try { await bootstrap(); } catch (_) { return; }
    const panel = document.createElement('div');
    panel.style.cssText = 'position:fixed;right:12px;top:74px;z-index:1025;background:var(--bg-card,#fff);border:1px solid #ccd6df;border-radius:8px;padding:6px;display:flex;gap:8px;align-items:center;font-size:12px';
    const link = document.createElement('a'); link.href = '/remote/manage'; link.textContent = 'Fjernbetjening';
    const button = document.createElement('button'); button.className = 'btn btn-sm btn-outline-secondary'; button.textContent = 'Følg i denne fane';
    panel.append(link, button); document.body.append(panel);
    const previousTabId = sessionStorage.getItem('hubRemoteTab');
    const tabId = requestId();
    let following = sessionStorage.getItem('hubRemoteFollow') === 'yes';
    // Browsers copy sessionStorage when duplicating a tab. Detect a living original
    // so a duplicate cannot silently take over its remote connection.
    if (typeof BroadcastChannel !== 'undefined') {
        const channel = new BroadcastChannel('hub-remote-tabs');
        let duplicate = false;
        channel.onmessage = ({data}) => {
            if (data.type === 'probe' && data.previous === tabId) channel.postMessage({type:'occupied',target:data.target});
            if (data.type === 'occupied' && data.target === tabId) duplicate = true;
        };
        if (previousTabId) {
            channel.postMessage({type:'probe',previous:previousTabId,target:tabId});
            await new Promise(resolve => setTimeout(resolve, 150));
            if (duplicate) { following = false; sessionStorage.setItem('hubRemoteFollow', 'no'); }
        }
        window.addEventListener('pagehide', () => channel.close(), {once:true});
    }
    sessionStorage.setItem('hubRemoteTab', tabId);
    let sequence = 0, pending = false;
    let dirty = false;
    document.addEventListener('input', event => { if (event.isTrusted && !panel.contains(event.target)) dirty = true; });
    document.addEventListener('change', event => { if (event.isTrusted && !panel.contains(event.target)) dirty = true; });
    const label = () => { button.textContent = following ? 'Stop med at følge' : 'Følg i denne fane'; };
    async function enable() {
        const result = await api('/follow', {tab_id: tabId, enable: true});
        following = result.following; sequence = result.sequence; sessionStorage.setItem('hubRemoteFollow', following ? 'yes' : 'no'); label();
    }
    button.onclick = async () => {
        if (pending) return;
        pending = true; button.disabled = true;
        try {
            if (following) { await api('/follow', {tab_id: tabId, disable: true}); following = false; sessionStorage.setItem('hubRemoteFollow', 'no'); label(); }
            else await enable();
        } catch (error) { button.title = error.message; }
        finally { pending = false; button.disabled = false; }
    };
    async function poll() {
        if (!following || pending || document.hidden) return;
        pending = true;
        try {
            const result = await api('/follow', {tab_id: tabId, after: sequence});
            following = result.following; sequence = result.sequence; label();
            if (!following) sessionStorage.setItem('hubRemoteFollow', 'no');
            if (result.selection) {
                const path = `/sag/${result.selection.case_id}`;
                if (!location.pathname.match(new RegExp(`^${path}(/|$)`))) {
                    // Keep an in-progress user edit visible before leaving the page.
                    const editing = dirty || ['INPUT', 'TEXTAREA', 'SELECT'].includes(document.activeElement?.tagName);
                    if (!editing || confirm('Fjernbetjeningen har valgt en anden sag. Skift nu?')) location.assign(path);
                }
            }
        } catch (error) { button.title = 'Forbindelse afbrudt · ' + error.message; }
        finally { pending = false; }
    }
    if (following) { try { await enable(); } catch (_) { following = false; } }
    label(); setInterval(poll, 3000);
    document.addEventListener('visibilitychange', () => { if (!document.hidden) poll(); });
})();