import { NextResponse } from 'next/server';
import fs from 'fs';
import path from 'path';

const leasesFilePath = '/var/lib/dhcp/dhcpd.leases';

function parseLeases(fileContent) {
    const leases = [];
    const leaseBlocks = fileContent.split('lease ');

    leaseBlocks.shift(); // Remove the first empty block

    leaseBlocks.forEach((block) => {
        const lease = {};
        const lines = block.split('\n');
        lease.ip = lines[0].trim();

        lines.forEach((line) => {
            line = line.trim();
            if (line.startsWith('starts')) {
                lease.start = line.split(' ')[2] + ' ' + line.split(' ')[3];
            } else if (line.startsWith('ends')) {
                lease.end = line.split(' ')[2] + ' ' + line.split(' ')[3];
            } else if (line.startsWith('binding state')) {
                lease.state = line.split(' ')[2];
            } else if (line.startsWith('hardware ethernet')) {
                lease.mac = line.split(' ')[2].replace(';', '');
            } else if (line.startsWith('client-hostname')) {
                lease.hostname = line.split(' ')[1].replace(';', '').replace(/"/g, '');
            }
        });

        leases.push(lease);
    });

    return leases;
}

export async function GET() {
    try {
        const fileContent = fs.readFileSync(leasesFilePath, 'utf8');
        const leases = parseLeases(fileContent);
        return NextResponse.json({ leases });
    } catch (error) {
        return NextResponse.json({ error: 'Failed to read DHCP leases file' }, { status: 500 });
    }
}