import Database from 'better-sqlite3';
import fs from 'fs';
import path from 'path';

import { log } from '../log.js';

let _db: Database.Database | null = null;

export function getDb(): Database.Database {
  if (!_db) throw new Error('Database not initialized. Call initDb() first.');
  return _db;
}

export function initDb(dbPath: string): Database.Database {
  fs.mkdirSync(path.dirname(dbPath), { recursive: true });
  _db = new Database(dbPath);
  _db.pragma('journal_mode = WAL');
  _db.pragma('foreign_keys = ON');
  log.info('Central DB initialized', { path: dbPath });
  return _db;
}

/** For tests only — creates an in-memory DB and runs migrations. */
export function initTestDb(): Database.Database {
  _db = new Database(':memory:');
  _db.pragma('foreign_keys = ON');
  return _db;
}

export function closeDb(): void {
  _db?.close();
  _db = null;
}