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

const dbPath = path.resolve(__dirname, 'eventy.db');
const db = new Database(dbPath);

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

function initDb() {
  const schema = `
    CREATE TABLE IF NOT EXISTS events (
      id TEXT PRIMARY KEY,
      name TEXT NOT NULL,
      description TEXT,
      start_date TEXT NOT NULL,
      end_date TEXT NOT NULL,
      created_at TEXT DEFAULT (datetime('now'))
    );

    CREATE TABLE IF NOT EXISTS participants (
      id TEXT PRIMARY KEY,
      event_id TEXT NOT NULL,
      name TEXT NOT NULL,
      created_at TEXT DEFAULT (datetime('now')),
      FOREIGN KEY (event_id) REFERENCES events(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS votes (
      id TEXT PRIMARY KEY,
      participant_id TEXT NOT NULL,
      date TEXT NOT NULL,
      status TEXT CHECK(status IN ('available', 'unavailable', 'maybe')) NOT NULL,
      FOREIGN KEY (participant_id) REFERENCES participants(id) ON DELETE CASCADE,
      UNIQUE(participant_id, date)
    );

    CREATE TABLE IF NOT EXISTS event_dates (
      event_id TEXT NOT NULL,
      date TEXT NOT NULL,
      PRIMARY KEY (event_id, date),
      FOREIGN KEY (event_id) REFERENCES events(id) ON DELETE CASCADE
    );
  `;
  db.exec(schema);
  console.log('Database initialized');
}

module.exports = {
  db,
  initDb
};