// Mirror of web/service/panel.go isNewerVersion: parse a vMAJOR.MINOR.PATCH tag
// (or this fork's own "vMAJOR.MINOR.PATCH-awg.N" release tag, see
// internal/config/version) and report whether `latest` is ahead of `current`.
// When either side isn't a recognized tag, fall back to a normalized string
// inequality — the same heuristic the Go side uses so the node "update
// available" badge agrees with what the server would decide.
const VERSION_PARTS_PATTERN = /^v?(\d+)\.(\d+)\.(\d+)(?:-awg\.(\d+))?$/;

function parseVersionParts(version: string): [number, number, number, number] | null {
  const match = VERSION_PARTS_PATTERN.exec(version.trim());
  if (!match) return null;
  return [Number(match[1]), Number(match[2]), Number(match[3]), Number(match[4] || 0)];
}

// Format a panel version for display. Dev builds report a "dev+<commit>"
// identity (see config.GetPanelVersion); show those — and any other
// non-numeric label — verbatim. Semantic versions get a single normalized "v"
// prefix, so a raw "v3.4.0" tag and a bare "3.4.0" both render as "v3.4.0"
// instead of doubling up to "vv3.4.0".
export function formatPanelVersion(version: string | undefined | null): string {
  const v = (version || '').trim();
  if (!v) return '';
  const normalized = v.replace(/^v/i, '');
  return /^\d/.test(normalized) ? `v${normalized}` : v;
}

export function isPanelUpdateAvailable(latest: string, current: string): boolean {
  if (!latest || !current) return false;
  const a = parseVersionParts(latest);
  const b = parseVersionParts(current);
  if (!a || !b) {
    return latest.trim().replace(/^v/, '') !== current.trim().replace(/^v/, '');
  }
  for (let i = 0; i < 4; i++) {
    if (a[i] > b[i]) return true;
    if (a[i] < b[i]) return false;
  }
  return false;
}