import { Database } from 'bun:sqlite';

export const db = new Database('tasks.db');

export function initializeDatabase() {
  db.exec(`
    CREATE TABLE IF NOT EXISTS tasks (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      description TEXT NOT NULL,
      created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
      due_date TIMESTAMP NULL,
      completed BOOLEAN DEFAULT FALSE,
      completed_at TIMESTAMP NULL,
      group_id TEXT NULL,
      created_by TEXT NOT NULL,
      FOREIGN KEY (created_by) REFERENCES users(id)
    );
    
    CREATE TABLE IF NOT EXISTS task_assignments (
      task_id INTEGER NOT NULL,
      user_id TEXT NOT NULL,
      assigned_by TEXT NOT NULL,
      assigned_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
      PRIMARY KEY (task_id, user_id),
      FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE
    );
    
    CREATE TABLE IF NOT EXISTS users (
      id TEXT PRIMARY KEY, -- WhatsApp user ID (normalized phone number without +)
      first_seen TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
      last_seen TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    );
    
    CREATE TABLE IF NOT EXISTS groups (
      id TEXT PRIMARY KEY,
      community_id TEXT NOT NULL,
      name TEXT,
      last_verified TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
      active BOOLEAN DEFAULT TRUE
    );
  `);
}