import { readFile } from 'fs/promises';
import nunjucks from 'nunjucks';
import { env } from './env.js';

nunjucks.configure({ autoescape: true });

export async function createVultrInstance(): Promise<any> {
  // Load cloud-init template
  const template = await readFile('./user-data.j2', 'utf-8');

  const hostname = `gitea-runner-${Date.now()}`

  // Render template with the runner token
  const userData = nunjucks.renderString(template, {
    GITEA_RUNNER_REGISTRATION_TOKEN: env.GITEA_RUNNER_REGISTRATION_TOKEN,
    hostname,
  });

  const body = {
    region: 'ord',
    plan: env.VPS_SPEC,
    os_id: 2284, // Ubuntu 22.04 x64
    user_data: Buffer.from(userData).toString('base64'),
    label: hostname,
    hostname,
    sshkey_id: null,
    enable_ipv6: true,
    enable_private_network: true,
  };

  const res = await fetch('https://api.vultr.com/v2/instances', {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${env.VULTR_API_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(body),
  });

  if (!res.ok) {
    const text = await res.text();
    throw new Error(`Failed to create VPS: ${res.status} ${text}`);
  }

  return res.json();
}