import { existsSync, readFileSync, writeFileSync } from 'fs';
import { join } from 'path';

export interface SiteMetadata {
  recordCid: string;
  fileCids: Record<string, string>; // path -> blob CID
  lastSync: number; // Unix timestamp
}

const METADATA_FILE = '.wisp-metadata.json';

export function getMetadataPath(siteDir: string): string {
  return join(siteDir, METADATA_FILE);
}

export function loadMetadata(siteDir: string): SiteMetadata | null {
  const path = getMetadataPath(siteDir);
  if (!existsSync(path)) {
    return null;
  }
  try {
    const content = readFileSync(path, 'utf-8');
    return JSON.parse(content) as SiteMetadata;
  } catch {
    return null;
  }
}

export function saveMetadata(siteDir: string, metadata: SiteMetadata): void {
  const path = getMetadataPath(siteDir);
  writeFileSync(path, JSON.stringify(metadata, null, 2));
}