import fs from 'fs';
import path from 'path';

export interface ActivityEntry {
  id: string;
  timestamp: string;
  type: 'post' | 'notebook' | 'infosec' | 'project' | 'link' | 'update' | 'system';
  message: string;
  link?: string;
}

const activityFile = path.join(process.cwd(), 'content', 'activity.json');

export function getActivity(): ActivityEntry[] {
  if (!fs.existsSync(activityFile)) return [];
  const raw = fs.readFileSync(activityFile, 'utf-8');
  return JSON.parse(raw);
}

export function addActivity(entry: Omit<ActivityEntry, 'id' | 'timestamp'>) {
  const entries = getActivity();
  const newEntry: ActivityEntry = {
    id: Date.now().toString(),
    timestamp: new Date().toISOString(),
    ...entry,
  };
  entries.unshift(newEntry);
  fs.writeFileSync(activityFile, JSON.stringify(entries.slice(0, 500), null, 2));
  return newEntry;
}