import sqlite3 from 'sqlite3';
import { open, Database } from 'sqlite';

let db: Database | null = null;

export async function getDb() {
  if (db) return db;

  // Enable verbose mode for debugging
  sqlite3.verbose();

  const dbPath = process.env.DB_PATH || './dashboard.db';

  db = await open({
    filename: dbPath,
    driver: sqlite3.Database
  });

  await db.exec(`
    CREATE TABLE IF NOT EXISTS uptime_logs (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      service_name TEXT NOT NULL,
      url TEXT NOT NULL,
      status TEXT NOT NULL,
      latency INTEGER,
      timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
    );

    CREATE TABLE IF NOT EXISTS visitors (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      ip_hash TEXT,
      city TEXT,
      country TEXT,
      lat REAL,
      lon REAL,
      timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
    );

    CREATE TABLE IF NOT EXISTS monitored_services (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      name TEXT NOT NULL UNIQUE,
      url TEXT NOT NULL,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
    );

    CREATE INDEX IF NOT EXISTS idx_uptime_logs_service_timestamp
      ON uptime_logs(service_name, timestamp);
  `);

  return db;
}