(() => {
    let ws = null;
    let reconnectTimer = null;

    function normalizeToken(value) {
        const token = String(value || '').trim();
        if (!token) return '';
        if (token.toLowerCase().startsWith('bearer ')) {
            return token.slice(7).trim();
        }
        return token;
    }

    function getCookie(name) {
        const cookie = document.cookie || '';
        const parts = cookie.split(';').map(p => p.trim());
        const match = parts.find(p => p.startsWith(`${name}=`));
        if (!match) return '';
        return decodeURIComponent(match.slice(name.length + 1));
    }

    function getToken() {
        const fromLocal = normalizeToken(localStorage.getItem('access_token'));
        if (fromLocal) return fromLocal;

        const fromSession = normalizeToken(sessionStorage.getItem('access_token'));
        if (fromSession) return fromSession;

        const fromCookie = normalizeToken(getCookie('access_token'));
        return fromCookie;
    }

    function ensureContainer() {
        let container = document.getElementById('telefoni-toast-container');
        if (!container) {
            container = document.createElement('div');
            container.id = 'telefoni-toast-container';
            container.setAttribute('aria-live', 'polite');
            container.setAttribute('aria-atomic', 'true');
            container.style.cssText = `
                position: fixed;
                top: 20px;
                right: 20px;
                z-index: 9999;
                width: 420px;
                max-width: 90%;
            `;
            document.body.appendChild(container);
        }
        return container;
    }

    function escapeHtml(str) {
        return String(str ?? '')
            .replaceAll('&', '&')
            .replaceAll('<', '&lt;')
            .replaceAll('>', '&gt;')
            .replaceAll('"', '&quot;')
            .replaceAll("'", '&#039;');
    }

    function showIncomingCallToast(data) {
        const container = ensureContainer();
        const contact = data.contact || null;
        const number = data.number || '';
        const title = contact?.name ? contact.name : 'Ukendt nummer';
        const company = contact?.company ? contact.company : '';

        const callId = data.call_id;

        const toastEl = document.createElement('div');
        toastEl.className = 'toast align-items-stretch';
        toastEl.setAttribute('role', 'alert');
        toastEl.setAttribute('aria-live', 'assertive');
        toastEl.setAttribute('aria-atomic', 'true');

        const openContactBtn = contact?.id
            ? `<button type="button" class="btn btn-sm btn-outline-secondary" data-action="open-contact">Åbn kontakt</button>`
            : '';

        toastEl.innerHTML = `
            <div class="toast-header">
                <strong class="me-auto"><i class="bi bi-telephone me-2"></i>Opkald</strong>
                <small class="text-muted">${escapeHtml(data.direction === 'outbound' ? 'Udgående' : 'Indgående')}</small>
                <button type="button" class="btn-close ms-2" data-bs-dismiss="toast" aria-label="Close"></button>
            </div>
            <div class="toast-body">
                <div class="fw-bold">${escapeHtml(number)}</div>
                <div>${escapeHtml(title)}</div>
                ${company ? `<div class="text-muted small">${escapeHtml(company)}</div>` : ''}
                <div class="d-flex gap-2 mt-3">
                    ${openContactBtn}
                    <button type="button" class="btn btn-sm btn-primary" data-action="create-case">Opret sag</button>
                </div>
            </div>
        `;

        container.appendChild(toastEl);
        const toast = new bootstrap.Toast(toastEl, { autohide: false });
        toast.show();

        toastEl.addEventListener('hidden.bs.toast', () => toastEl.remove());

        toastEl.addEventListener('click', (e) => {
            const btn = e.target.closest('button[data-action]');
            if (!btn) return;
            const action = btn.getAttribute('data-action');
            if (action === 'open-contact' && contact?.id) {
                window.location.href = `/contacts/${contact.id}`;
            }
            if (action === 'create-case') {
                const qs = new URLSearchParams();
                if (contact?.id) qs.set('contact_id', String(contact.id));
                qs.set('title', `Telefonsamtale – ${number}`);
                qs.set('telefoni_opkald_id', String(callId));
                window.location.href = `/sag/new?${qs.toString()}`;
            }
        });
    }

    function scheduleReconnect() {
        if (reconnectTimer) return;
        reconnectTimer = setTimeout(() => {
            reconnectTimer = null;
            connect();
        }, 5000);
    }

    function connect() {
        if (ws && ws.readyState === WebSocket.OPEN) {
            return;
        }

        const token = getToken();
        if (!token) {
            scheduleReconnect();
            return;
        }

        const proto = window.location.protocol === 'https:' ? 'wss' : 'ws';
        const url = `${proto}://${window.location.host}/api/v1/telefoni/ws?token=${encodeURIComponent(token)}`;
        ws = new WebSocket(url);

        ws.onopen = () => console.log('📞 Telefoni WS connected');
        ws.onclose = (evt) => {
            console.log('📞 Telefoni WS disconnected', evt.code, evt.reason || '');
            scheduleReconnect();
        };
        ws.onerror = () => {
            // onclose handles reconnect
        };
        ws.onmessage = (evt) => {
            try {
                const msg = JSON.parse(evt.data);
                if (msg?.event === 'incoming_call') {
                    showIncomingCallToast(msg.data || {});
                }
            } catch (e) {
                console.warn('Telefoni WS message parse failed', e);
            }
        };
    }

    document.addEventListener('DOMContentLoaded', connect);
    window.addEventListener('focus', connect);
    window.addEventListener('storage', (evt) => {
        if (evt.key === 'access_token') connect();
    });
})();