import { getJobs, getJob, getInstances, updateInstance, createJobRun, completeJobRun } from './db.js';

// ── Handlers ──────────────────────────────────────────────────────────────────

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

async function tailscaleSyncHandler(cfg) {
  const { api_key, tailnet } = cfg;
  if (!api_key || !tailnet) throw new Error('Tailscale not configured — set API key and tailnet');

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

  const { devices } = await res.json();
  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);
    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) {
      const { id: _id, created_at: _ca, updated_at: _ua, ...instData } = inst;
      updateInstance(inst.vmid, { ...instData, tailscale: newTailscale, tailscale_ip: newIp });
      updated++;
    }
  }
  return { summary: `${updated} updated of ${instances.length}` };
}

// ── Registry ──────────────────────────────────────────────────────────────────

const HANDLERS = {
  tailscale_sync: tailscaleSyncHandler,
};

// ── Public API ────────────────────────────────────────────────────────────────

export async function runJob(jobId) {
  const job = getJob(jobId);
  if (!job) throw new Error('Job not found');
  const handler = HANDLERS[job.key];
  if (!handler) throw new Error(`No handler for '${job.key}'`);
  const cfg = JSON.parse(job.config || '{}');
  const runId = createJobRun(jobId);
  try {
    const result = await handler(cfg);
    completeJobRun(runId, 'success', result.summary ?? '');
    return result;
  } catch (e) {
    completeJobRun(runId, 'error', e.message);
    throw e;
  }
}

const _intervals = new Map();

export function restartJobs() {
  for (const iv of _intervals.values()) clearInterval(iv);
  _intervals.clear();
  for (const job of getJobs()) {
    if (!job.enabled) continue;
    const ms = Math.max(1, job.schedule || 15) * 60_000;
    const id = job.id;
    _intervals.set(id, setInterval(() => runJob(id).catch(() => {}), ms));
  }
}