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

const dataDir = process.env.DATA_DIR || path.join(__dirname, 'data');
if (!fs.existsSync(dataDir)) {
  fs.mkdirSync(dataDir, { recursive: true });
}

const db = new Database(path.join(dataDir, 'sudoku.db'));
db.pragma('journal_mode = WAL');
db.pragma('foreign_keys = ON');

db.exec(`
  CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    pseudo TEXT NOT NULL UNIQUE,
    email TEXT NOT NULL UNIQUE,
    password_hash TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
  );

  CREATE TABLE IF NOT EXISTS games (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    difficulty TEXT NOT NULL,
    time_seconds INTEGER NOT NULL,
    mistakes INTEGER NOT NULL DEFAULT 0,
    won INTEGER NOT NULL DEFAULT 0,
    points INTEGER NOT NULL DEFAULT 0,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
  );

  CREATE INDEX IF NOT EXISTS idx_games_user ON games(user_id);
  CREATE INDEX IF NOT EXISTS idx_games_diff ON games(difficulty, won, time_seconds);
`);

module.exports = db;