const Database = require('better-sqlite3');
const path = require('path');

/**
 * Initialize SQLite database with projects schema
 */
function initializeDatabase() {
  // Database file in project root
  const dbPath = path.join(__dirname, '..', 'database.sqlite');

  // Initialize database connection
  const db = new Database(dbPath);

  // Enable WAL mode for better concurrency
  db.pragma('journal_mode = WAL');

  // Create projects table
  db.exec(`
    CREATE TABLE IF NOT EXISTS projects (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      name TEXT NOT NULL UNIQUE,
      description TEXT,
      icon TEXT DEFAULT '📁',
      color TEXT DEFAULT '#4a9eff',
      path TEXT NOT NULL,
      createdAt TEXT NOT NULL,
      lastActivity TEXT NOT NULL,
      deletedAt TEXT NULL
    )
  `);

  // Create index on deletedAt for efficient soft-delete queries
  db.exec(`
    CREATE INDEX IF NOT EXISTS idx_projects_deletedAt ON projects(deletedAt)
  `);

  // Create index on name for efficient name lookups
  db.exec(`
    CREATE INDEX IF NOT EXISTS idx_projects_name ON projects(name)
  `);

  return db;
}

/**
 * Initialize database with requireAuth check
 */
let dbInstance = null;

function getDatabase() {
  if (!dbInstance) {
    try {
      dbInstance = initializeDatabase();
      console.log('Database initialized successfully');
    } catch (error) {
      console.error('Failed to initialize database:', error);
      throw error;
    }
  }
  return dbInstance;
}

// Initialize database immediately
const db = getDatabase();

module.exports = {
  db,
  getDatabase
};