const nodesTable = document.getElementById('nodesTable');
const messagesList = document.getElementById('messagesList');
const statusDot = document.getElementById('statusDot');
const statusText = document.getElementById('statusText');
const nodeCountBadge = document.getElementById('nodeCountBadge');

let currentUser = null;
let nodes = {};
let channels = {};
let myNodeId = null;
let ws;

// Auth check
fetch('/api/auth/me').then(r => r.ok ? r.json() : null).then(u => {
    currentUser = u;
    updateNavbar();
    updateSidebar();
    updateVisibility();
});

function updateNavbar() {
    if (currentUser) {
        document.getElementById('userName').textContent = currentUser.name;
        document.getElementById('userMenu').classList.remove('d-none');
        document.getElementById('loginBtn').classList.add('d-none');
    } else {
        document.getElementById('userMenu').classList.add('d-none');
        document.getElementById('loginBtn').classList.remove('d-none');
    }
}

function updateSidebar() {
    const isAdmin = currentUser && currentUser.role === 'admin';
    document.querySelectorAll('.sidebar-admin').forEach(el => {
        el.style.display = isAdmin ? '' : 'none';
    });
}

function updateVisibility() {
    const loggedIn = !!currentUser;
    const sendCard = document.getElementById('sendCard');
    const messagesCard = document.getElementById('messagesCard');
    if (loggedIn) {
        sendCard.classList.remove('d-none');
        messagesCard.classList.remove('d-none');
    }
}

function connectWebSocket() {
    const proto = location.protocol === 'https:' ? 'wss:' : 'ws:';
    ws = new WebSocket(`${proto}//${location.host}/ws`);

    ws.onopen = () => {
        statusDot.classList.add('connected');
        statusText.textContent = 'Verbunden';
    };

    ws.onclose = () => {
        statusDot.classList.remove('connected');
        statusText.textContent = 'Getrennt - Reconnect...';
        setTimeout(connectWebSocket, 3000);
    };

    ws.onerror = () => {
        ws.close();
    };

    ws.onmessage = (event) => {
        const msg = JSON.parse(event.data);
        switch (msg.type) {
            case 'initial':
                msg.data.forEach(node => { nodes[node.node_id] = node; });
                renderNodes();
                break;
            case 'node_update':
                nodes[msg.data.node_id] = msg.data;
                renderNodes();
                break;
            case 'initial_messages':
                msg.data.reverse().forEach(m => addMessage(m));
                break;
            case 'channels':
                channels = msg.data;
                populateChannelDropdown();
                break;
            case 'my_node_id':
                myNodeId = msg.data;
                break;
            case 'new_message':
                addMessage(msg.data);
                break;
            case 'stats_update':
                updateStats(msg.data);
                break;
        }
    };
}

function renderNodes() {
    const sorted = Object.values(nodes).sort((a, b) => (b.last_seen || 0) - (a.last_seen || 0));
    nodeCountBadge.textContent = sorted.length;
    nodesTable.innerHTML = sorted.map(node => {
        let name = node.node_id;
        if (node.long_name && node.short_name) {
            name = `${node.long_name} (${node.short_name})`;
        } else if (node.long_name) {
            name = node.long_name;
        } else if (node.short_name) {
            name = node.short_name;
        }
        const hw = node.hw_model || '-';
        const snr = node.snr != null ? `${node.snr.toFixed(1)} dB` : '-';
        const battery = renderBattery(node.battery);
        const hops = node.hop_count != null ? node.hop_count : '-';
        const lastSeen = node.last_seen ? timeAgo(node.last_seen) : '-';
        const onlineClass = isOnline(node.last_seen) ? 'text-success' : '';
        return `<tr>
            <td class="${onlineClass}">${escapeHtml(name)}</td>
            <td class="text-body-secondary">${escapeHtml(hw)}</td>
            <td class="text-end px-1">${snr}</td>
            <td class="px-1">${battery}</td>
            <td class="text-center px-1">${hops}</td>
            <td class="text-end px-1 text-body-secondary">${lastSeen}</td>
        </tr>`;
    }).join('');
}

function renderBattery(level) {
    if (level == null) return '<span class="text-body-secondary">-</span>';
    let iconClass, colorClass;
    if (level > 75) { iconClass = 'bi-battery-full'; colorClass = 'text-success'; }
    else if (level > 50) { iconClass = 'bi-battery-half'; colorClass = 'text-success'; }
    else if (level > 20) { iconClass = 'bi-battery-half'; colorClass = 'text-warning'; }
    else { iconClass = 'bi-battery'; colorClass = 'text-danger'; }
    return `<span class="${colorClass}"><i class="bi ${iconClass} me-1"></i>${level}%</span>`;
}

function addMessage(msg) {
    const item = document.createElement('div');
    const isSent = myNodeId && msg.from_node === myNodeId;
    item.className = 'msg-item' + (isSent ? ' msg-sent' : '');
    const time = msg.timestamp ? new Date(msg.timestamp * 1000).toLocaleTimeString('de-DE') : '';
    const fromNode = nodes[msg.from_node];
    const from = isSent ? 'Bot' : ((fromNode && fromNode.long_name) ? fromNode.long_name : (msg.from_node || '?'));
    const chIdx = msg.channel != null ? msg.channel : '?';
    const chName = channels[chIdx] || `Ch ${chIdx}`;
    const bubbleClass = isSent ? 'msg-bubble msg-bubble-sent' : 'msg-bubble';
    const icon = isSent ? 'bi-send-fill' : 'bi-person-fill';
    item.innerHTML = `
        <div class="d-flex justify-content-between align-items-center mb-1">
            <small class="fw-medium"><i class="bi ${icon} me-1 text-body-secondary"></i>${escapeHtml(from)}</small>
            <small class="text-body-secondary"><span class="badge badge-pill bg-body-secondary me-1">${escapeHtml(chName)}</span>${time}</small>
        </div>
        <div class="${bubbleClass}">${escapeHtml(msg.payload || '')}</div>`;
    messagesList.prepend(item);
    while (messagesList.children.length > 100) {
        messagesList.removeChild(messagesList.lastChild);
    }
}

function updateStats(stats) {
    if (stats.version) {
        document.getElementById('versionLabel').textContent = `v${stats.version}`;
    }
    document.getElementById('statNodes').textContent = stats.total_nodes || 0;
    document.getElementById('statNodes24h').textContent = stats.nodes_24h || 0;
    document.getElementById('statCommands').textContent = stats.total_commands || 0;

    const breakdown = document.getElementById('commandBreakdown');
    const cmds = stats.command_breakdown || {};
    if (Object.keys(cmds).length > 0) {
        breakdown.innerHTML = Object.entries(cmds).map(([cmd, count]) =>
            `<span class="badge bg-primary bg-opacity-75">${escapeHtml(cmd)} <span class="badge bg-light text-dark ms-1">${count}</span></span>`
        ).join('');
    } else {
        breakdown.innerHTML = '<span class="text-body-secondary small">Noch keine Anfragen</span>';
    }
}

function isOnline(lastSeen) {
    if (!lastSeen) return false;
    return (Date.now() / 1000 - lastSeen) < 900; // < 15 min
}

function timeAgo(timestamp) {
    const seconds = Math.floor(Date.now() / 1000 - timestamp);
    if (seconds < 60) return `${seconds}s`;
    if (seconds < 3600) return `${Math.floor(seconds / 60)}m`;
    if (seconds < 86400) return `${Math.floor(seconds / 3600)}h`;
    return `${Math.floor(seconds / 86400)}d`;
}

function escapeHtml(str) {
    const div = document.createElement('div');
    div.textContent = str;
    return div.innerHTML;
}

// Send message
function populateChannelDropdown() {
    const sel = document.getElementById('sendChannel');
    sel.innerHTML = '';
    for (const [idx, name] of Object.entries(channels)) {
        const opt = document.createElement('option');
        opt.value = idx;
        opt.textContent = name;
        sel.appendChild(opt);
    }
}

async function sendMessage() {
    const textEl = document.getElementById('sendText');
    const text = textEl.value.trim();
    if (!text) return;
    const channel = parseInt(document.getElementById('sendChannel').value) || 0;
    const btn = document.getElementById('btnSend');
    btn.disabled = true;
    try {
        await fetch('/api/send', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ text, channel })
        });
        textEl.value = '';
    } catch (e) {
        console.error('Send failed:', e);
    } finally {
        btn.disabled = false;
        textEl.focus();
    }
}

document.getElementById('btnSend').addEventListener('click', sendMessage);
document.getElementById('sendText').addEventListener('keydown', (e) => {
    if (e.key === 'Enter') { e.preventDefault(); sendMessage(); }
});

// Theme toggle
const themeToggle = document.getElementById('themeToggle');
const themeIcon = document.getElementById('themeIcon');

function applyTheme(theme) {
    document.documentElement.setAttribute('data-bs-theme', theme);
    themeIcon.className = theme === 'dark' ? 'bi bi-sun-fill' : 'bi bi-moon-fill';
    localStorage.setItem('theme', theme);
}

// Load saved theme
applyTheme(localStorage.getItem('theme') || 'dark');

themeToggle.addEventListener('click', () => {
    const current = document.documentElement.getAttribute('data-bs-theme');
    applyTheme(current === 'dark' ? 'light' : 'dark');
});

// Sidebar toggle (mobile)
const sidebarToggle = document.getElementById('sidebarToggle');
const sidebar = document.getElementById('sidebar');
const sidebarBackdrop = document.getElementById('sidebarBackdrop');

if (sidebarToggle) {
    sidebarToggle.addEventListener('click', () => sidebar.classList.toggle('open'));
    sidebarBackdrop.addEventListener('click', () => sidebar.classList.remove('open'));
}

connectWebSocket();