// ── Channel color palette ──────────────────────────────────────
const CH_COLORS = [
    { bg: 'rgba(13,202,240,.12)',  border: '#0dcaf0', text: '#0dcaf0'  }, // 0 cyan
    { bg: 'rgba(25,135,84,.12)',   border: '#198754', text: '#198754'  }, // 1 green
    { bg: 'rgba(255,193,7,.12)',   border: '#ffc107', text: '#d9a406'  }, // 2 yellow
    { bg: 'rgba(220,53,69,.12)',   border: '#dc3545', text: '#dc3545'  }, // 3 red
    { bg: 'rgba(102,16,242,.12)',  border: '#6610f2', text: '#6610f2'  }, // 4 indigo
    { bg: 'rgba(13,110,253,.12)',  border: '#0d6efd', text: '#0d6efd'  }, // 5 blue
    { bg: 'rgba(32,201,151,.12)',  border: '#20c997', text: '#20c997'  }, // 6 teal
    { bg: 'rgba(253,126,20,.12)',  border: '#fd7e14', text: '#fd7e14'  }, // 7 orange
];

function chColor(chIdx) {
    return CH_COLORS[chIdx % CH_COLORS.length] || CH_COLORS[0];
}

// ── State ──────────────────────────────────────────────────────
let nodes = {};
let channels = {};
let myNodeId = null;
let ws;
let msgChannelFilter = 'all';
let messages = [];

initPage({ onAuth: (user) => {
    if (!user) {
        document.getElementById('loginNotice').classList.remove('d-none');
    } else {
        document.getElementById('messagesView').classList.remove('d-none');
        connectWebSocket();
    }
}});

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

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

    ws.onclose = () => {
        document.getElementById('statusDot').classList.remove('connected');
        document.getElementById('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(n => { nodes[n.node_id] = n; });
                break;
            case 'node_update':
                nodes[msg.data.node_id] = msg.data;
                break;
            case 'channels':
                channels = msg.data;
                renderFilterBar();
                break;
            case 'my_node_id':
                myNodeId = msg.data;
                break;
            case 'initial_messages':
                messages = [];
                document.getElementById('messagesList').innerHTML = '';
                msg.data.reverse().forEach(m => addMessage(m));
                break;
            case 'new_message':
                addMessage(msg.data);
                break;
        }
    };
}

// ── Message rendering ─────────────────────────────────────────
function addMessage(msg) {
    messages.push(msg);
    if (messages.length > 300) messages.shift();

    const isSent = myNodeId && msg.from_node === myNodeId;
    const chIdx = msg.channel != null ? msg.channel : 0;
    const chName = channels[chIdx] != null ? channels[chIdx] : `Ch ${chIdx}`;
    const time = msg.timestamp ? new Date(msg.timestamp * 1000).toLocaleString('de-DE', {
        day: '2-digit', month: '2-digit', hour: '2-digit', minute: '2-digit'
    }) : '';
    const fromNode = nodes[msg.from_node];
    const fromName = isSent ? 'Bot' : ((fromNode && fromNode.long_name) ? fromNode.long_name : (msg.from_node || '?'));
    const fromId   = isSent ? '' : msg.from_node || '';
    const col = chColor(chIdx);

    const item = document.createElement('div');
    item.className = 'msg-full-item' + (isSent ? ' msg-full-sent' : '');
    item.dataset.channel = String(chIdx);

    if (msgChannelFilter !== 'all' && String(chIdx) !== msgChannelFilter) {
        item.classList.add('d-none');
    }

    if (isSent) {
        // Sent: right-aligned, green
        item.innerHTML = `
        <div class="msg-full-row msg-full-row-sent">
            <div class="msg-full-meta text-end">
                <small class="text-body-secondary">${time}</small>
                <span class="msg-ch-badge" style="background:${col.bg};border-color:${col.border};color:${col.text}">${escapeHtml(chName)}</span>
                <span class="fw-medium msg-full-name"><i class="bi bi-send-fill me-1" style="font-size:.7rem"></i>${escapeHtml(fromName)}</span>
            </div>
            <div class="msg-full-bubble msg-full-bubble-sent">${escapeHtml(msg.payload || '')}</div>
        </div>`;
    } else {
        // Received: left-aligned, channel colored
        item.innerHTML = `
        <div class="msg-full-row">
            <div class="msg-full-icon" style="background:${col.bg};border-color:${col.border}">
                <i class="bi bi-person-fill" style="color:${col.text};font-size:.85rem"></i>
            </div>
            <div class="msg-full-body">
                <div class="msg-full-meta">
                    <span class="fw-medium msg-full-name">${escapeHtml(fromName)}</span>
                    ${fromId ? `<span class="text-body-secondary ms-1" style="font-size:.7rem">${escapeHtml(fromId)}</span>` : ''}
                    <span class="msg-ch-badge" style="background:${col.bg};border-color:${col.border};color:${col.text}">${escapeHtml(chName)}</span>
                    <small class="text-body-secondary ms-auto">${time}</small>
                </div>
                <div class="msg-full-bubble" style="border-left-color:${col.border}">${escapeHtml(msg.payload || '')}</div>
            </div>
        </div>`;
    }

    const list = document.getElementById('messagesList');
    list.prepend(item);
    updateCount();
}

function updateCount() {
    const visible = document.getElementById('messagesList').querySelectorAll('.msg-full-item:not(.d-none)').length;
    document.getElementById('msgCount').textContent = visible;
}

// ── Channel filter bar ────────────────────────────────────────
function renderFilterBar() {
    const bar = document.getElementById('msgFilterBar');
    const sorted = Object.entries(channels).sort((a, b) => parseInt(a[0]) - parseInt(b[0]));
    const mkBtn = (ch, label, col) => {
        const active = ch === msgChannelFilter;
        const colStyle = col ? `background:${active ? col.border : 'transparent'};border-color:${col.border};color:${active ? '#fff' : col.text}` : '';
        const cls = col ? '' : (active ? 'btn-secondary' : 'btn-outline-secondary');
        return `<button class="btn btn-sm ${cls} py-0 px-2" data-ch="${escapeHtml(ch)}" style="font-size:.7rem;${colStyle}">${escapeHtml(label)}</button>`;
    };
    bar.innerHTML =
        mkBtn('all', 'Alle', null) +
        sorted.map(([idx, name]) => mkBtn(String(idx), name, chColor(parseInt(idx)))).join('');
    bar.onclick = (e) => {
        const btn = e.target.closest('button[data-ch]');
        if (!btn) return;
        msgChannelFilter = btn.dataset.ch;
        renderFilterBar();
        applyFilter();
    };
}

function applyFilter() {
    document.getElementById('messagesList').querySelectorAll('.msg-full-item').forEach(item => {
        const vis = msgChannelFilter === 'all' || item.dataset.channel === msgChannelFilter;
        item.classList.toggle('d-none', !vis);
    });
    updateCount();
}

// Clear button
document.getElementById('msgClearBtn').addEventListener('click', () => {
    messages = [];
    document.getElementById('messagesList').innerHTML = '';
    updateCount();
});