export function formatBytes(bytes) {
    if (bytes < 1024) return bytes.toFixed(0) + ' B/s';
    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB/s';
    if (bytes < 1024 * 1024 * 1024) return (bytes / (1024 * 1024)).toFixed(1) + ' MB/s';
    return (bytes / (1024 * 1024 * 1024)).toFixed(1) + ' GB/s';
}

export function formatPackets(pps) {
    if (pps < 1000) return pps.toFixed(0) + ' pps';
    if (pps < 1000000) return (pps / 1000).toFixed(1) + 'K pps';
    return (pps / 1000000).toFixed(1) + 'M pps';
}

export function formatMbps(bytesPerSec) {
    const mbps = (bytesPerSec * 8) / 1000000;
    return Math.round(mbps).toLocaleString() + ' Mbit/s';
}

export function formatPps(pps) {
    return Math.round(pps).toLocaleString() + ' pps';
}

export function formatLinkSpeed(bps) {
    if (!bps) return '?';
    const mbps = bps / 1000000;
    return mbps.toLocaleString() + ' Mbit/s';
}

export function formatUniverse(u, protocol) {
    if (protocol === 'artnet') {
        const net = (u >> 8) & 0x7f;
        const subnet = (u >> 4) & 0x0f;
        const universe = u & 0x0f;
        return net + ':' + subnet + ':' + universe + ' (' + u + ')';
    }
    return String(u);
}

export function formatArtmapAddr(addr) {
    const uniStr = formatUniverse(addr.universe, addr.protocol);
    let result = addr.protocol + ' ' + uniStr;
    if (addr.channel_start && addr.channel_end && !(addr.channel_start === 1 && addr.channel_end === 512)) {
        if (addr.channel_start === addr.channel_end) {
            result += ' ch' + addr.channel_start;
        } else {
            result += ' ch' + addr.channel_start + '-' + addr.channel_end;
        }
    } else if (addr.channel_start && addr.channel_start !== 1) {
        result += ' ch' + addr.channel_start;
    }
    return result;
}

export function escapeHtml(str) {
    if (!str) return '';
    return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}