import { getInstances, updateInstance, getConfig, setConfig } from './db.js';

const TAILSCALE_API = 'https://api.tailscale.com/api/v2';

let _interval = null;

export async function runTailscaleSync() {
  const apiKey  = getConfig('tailscale_api_key');
  const tailnet = getConfig('tailscale_tailnet');
  if (!apiKey || !tailnet) throw new Error('Tailscale not configured');

  const res = await fetch(
    `${TAILSCALE_API}/tailnet/${encodeURIComponent(tailnet)}/devices`,
    { headers: { Authorization: `Bearer ${apiKey}` } }
  );
  if (!res.ok) throw new Error(`Tailscale API ${res.status}`);

  const { devices } = await res.json();

  // hostname -> first 100.x.x.x address
  const tsMap = new Map(
    devices.map(d => [d.hostname, (d.addresses ?? []).find(a => a.startsWith('100.')) ?? ''])
  );

  const instances = getInstances();
  let updated = 0;

  for (const inst of instances) {
    const tsIp   = tsMap.get(inst.name);   // undefined = not in Tailscale
    const matched = tsIp !== undefined;

    const newTailscale = matched ? 1 : (inst.tailscale === 1 ? 0 : inst.tailscale);
    const newIp        = matched ? tsIp : (inst.tailscale === 1 ? '' : inst.tailscale_ip);

    if (newTailscale !== inst.tailscale || newIp !== inst.tailscale_ip) {
      // Strip db-generated columns — node:sqlite rejects unknown named parameters
      const { id: _id, created_at: _ca, updated_at: _ua, ...instData } = inst;
      updateInstance(inst.vmid, { ...instData, tailscale: newTailscale, tailscale_ip: newIp });
      updated++;
    }
  }

  return { updated, total: instances.length };
}

export function restartJobs() {
  if (_interval) { clearInterval(_interval); _interval = null; }
  if (getConfig('tailscale_enabled') !== '1') return;

  const mins = parseInt(getConfig('tailscale_poll_minutes', '15'), 10);
  const ms   = Math.max(1, Number.isFinite(mins) ? mins : 15) * 60_000;

  _interval = setInterval(async () => {
    try {
      const r = await runTailscaleSync();
      setConfig('tailscale_last_run_at', new Date().toISOString());
      setConfig('tailscale_last_result', `ok: ${r.updated} updated of ${r.total}`);
    } catch (e) {
      setConfig('tailscale_last_run_at', new Date().toISOString());
      setConfig('tailscale_last_result', `error: ${e.message}`);
    }
  }, ms);
}