import { Capacitor } from '@capacitor/core';
import { App } from '@capacitor/app';

export async function checkForUpdates() {
  if (!Capacitor.isNativePlatform()) {
    console.log('Auto-update skipped (running on web)');
    return;
  }

  function isNewer(current, target) {
    const c = current.replace(/^v/, '').split('.').map(Number);
    const t = target.replace(/^v/, '').split('.').map(Number);

    for (let i = 0; i < 3; i++) {
      if (t[i] > c[i]) return true;
      if (t[i] < c[i]) return false;
    }
    return false;
  }

  try {
    const { CapacitorUpdater } = await import('@capgo/capacitor-updater');

    await CapacitorUpdater.notifyAppReady();

    const GITEA_API_URL = 'https://git.crylia.de/Crylia/zen-kanji/releases/latest';

    const appInfo = await App.getInfo();
    const currentVersion = appInfo.version;

    const response = await fetch(GITEA_API_URL);
    if (!response.ok) return;

    const release = await response.json();
    const latestTag = release.tag_name;

    if (!isNewer(currentVersion, latestTag)) {
      return;
    }

    const asset = release.assets.find((a) => a.name === 'dist.zip');
    if (!asset) return;

    console.log(`Downloading update: ${latestTag}`);

    const version = await CapacitorUpdater.download({
      url: asset.browser_download_url,
      version: latestTag,
    });

    await CapacitorUpdater.set(version);
  } catch (error) {
    console.error('Auto-update failed:', error);
  }
}