(() => {
    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 recentCases = data.recent_cases || [];
        const lastCall = data.last_call;

        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>`
            : '';

        // Build recent cases HTML
        let casesHtml = '';
        if (recentCases.length > 0) {
            casesHtml = '<div class="mt-2 mb-2"><small class="text-muted fw-semibold">Åbne sager:</small>';
            recentCases.forEach(c => {
                casesHtml += `<div class="small"><a href="/sag/${c.id}" class="text-decoration-none" target="_blank">${escapeHtml(c.titel)}</a></div>`;
            });
            casesHtml += '</div>';
        }

        // Build last call HTML
        let lastCallHtml = '';
        if (lastCall) {
            // lastCall can be either a date string (legacy) or an object with started_at and bruger_navn
            const callDate = lastCall.started_at ? lastCall.started_at : lastCall;
            const lastCallDate = new Date(callDate);
            const now = new Date();
            const diffMs = now - lastCallDate;
            const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
            
            let timeAgo = '';
            if (diffDays === 0) {
                timeAgo = 'I dag';
            } else if (diffDays === 1) {
                timeAgo = 'I går';
            } else if (diffDays < 7) {
                timeAgo = `${diffDays} dage siden`;
            } else {
                timeAgo = lastCallDate.toLocaleDateString('da-DK');
            }
            
            const brugerInfo = lastCall.bruger_navn ? ` (${escapeHtml(lastCall.bruger_navn)})` : '';
            
            // Format duration
            let durationInfo = '';
            if (lastCall.duration_sec) {
                const mins = Math.floor(lastCall.duration_sec / 60);
                const secs = lastCall.duration_sec % 60;
                if (mins > 0) {
                    durationInfo = ` - ${mins}m ${secs}s`;
                } else {
                    durationInfo = ` - ${secs}s`;
                }
            }
            
            lastCallHtml = `<div class="small text-muted mt-2"><i class="bi bi-clock-history me-1"></i>Sidst snakket: ${timeAgo}${brugerInfo}${durationInfo}</div>`;
        }

        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>` : ''}
                ${lastCallHtml}
                ${casesHtml}
                <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>
                    <button type="button" class="btn btn-sm btn-outline-primary" data-action="link-case">Link sag</button>
                </div>
            </div>
        `;

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

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

        async function patchCallCase(caseId) {
            const parsedCaseId = Number(caseId);
            if (!Number.isInteger(parsedCaseId) || parsedCaseId <= 0) {
                throw new Error('Ugyldigt sag-ID');
            }
            if (!Number.isInteger(Number(callId)) || Number(callId) <= 0) {
                throw new Error('Mangler call_id');
            }

            const res = await fetch(`/api/v1/telefoni/calls/${Number(callId)}`, {
                method: 'PATCH',
                headers: { 'Content-Type': 'application/json' },
                credentials: 'include',
                body: JSON.stringify({ sag_id: parsedCaseId })
            });

            if (!res.ok) {
                const t = await res.text();
                throw new Error(t || `HTTP ${res.status}`);
            }
            return parsedCaseId;
        }

        toastEl.addEventListener('click', async (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));
                if (contact?.company_id) qs.set('customer_id', String(contact.company_id));
                qs.set('title', `Telefonsamtale – ${number}`);
                qs.set('telefoni_opkald_id', String(callId));
                window.location.href = `/sag/new?${qs.toString()}`;
            }
            if (action === 'link-case') {
                const answer = window.prompt('Indtast eksisterende sag-ID, som opkaldet skal linkes til:');
                if (answer === null) return;
                const caseId = Number(String(answer).trim());
                if (!Number.isInteger(caseId) || caseId <= 0) {
                    window.alert('Ugyldigt sag-ID');
                    return;
                }

                btn.disabled = true;
                const originalText = btn.textContent;
                btn.textContent = 'Gemmer...';
                try {
                    const linkedCaseId = await patchCallCase(caseId);
                    window.location.href = `/sag/${linkedCaseId}/v3`;
                } catch (err) {
                    window.alert(`Kunne ikke linke sag: ${err?.message || 'ukendt fejl'}`);
                } finally {
                    btn.disabled = false;
                    btn.textContent = originalText;
                }
            }
        });
    }

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

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

        const token = getToken();
        const proto = window.location.protocol === 'https:' ? 'wss' : 'ws';
        // Fallback to cookie-auth websocket when token is HttpOnly and cannot be read by JS.
        const url = token
            ? `${proto}://${window.location.host}/api/v1/telefoni/ws?token=${encodeURIComponent(token)}`
            : `${proto}://${window.location.host}/api/v1/telefoni/ws`;
        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();
    });
})();