"use strict";
/* ================= SQLite（node:sqlite 内置驱动，零依赖） ================= */
const { DatabaseSync } = require("node:sqlite");
const path = require("node:path");
const fs = require("node:fs");
const { expandHome } = require("./env");

/* 数据目录不放源码树：默认 ~/.starraid，可用 DATA_DIR 环境变量 / .env 覆盖 */
const DATA_DIR = expandHome(process.env.DATA_DIR || path.join(require("node:os").homedir(), ".starraid"));
fs.mkdirSync(DATA_DIR, { recursive: true });

const db = new DatabaseSync(path.join(DATA_DIR, "starraid.db"));
db.exec("PRAGMA journal_mode=WAL;");
db.exec("PRAGMA foreign_keys=ON;");

db.exec(`
CREATE TABLE IF NOT EXISTS users(
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  username TEXT NOT NULL UNIQUE COLLATE NOCASE,
  email TEXT NOT NULL UNIQUE COLLATE NOCASE,
  pass_hash TEXT NOT NULL,
  created_at INTEGER NOT NULL
);
CREATE TABLE IF NOT EXISTS sessions(
  token TEXT PRIMARY KEY,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  created_at INTEGER NOT NULL,
  expires_at INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_sessions_user ON sessions(user_id);
CREATE TABLE IF NOT EXISTS user_stats(
  user_id INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
  boss_kills INTEGER NOT NULL DEFAULT 0,
  endless_high INTEGER NOT NULL DEFAULT 0,
  runs INTEGER NOT NULL DEFAULT 0,
  updated_at INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE IF NOT EXISTS codex_unlocks(
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  entry_key TEXT NOT NULL,
  unlocked_at INTEGER NOT NULL,
  PRIMARY KEY(user_id, entry_key)
);
CREATE TABLE IF NOT EXISTS runs(
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  mode TEXT NOT NULL,
  diff INTEGER NOT NULL,
  score INTEGER NOT NULL,
  wave INTEGER NOT NULL,
  stage INTEGER NOT NULL,
  time_sec INTEGER NOT NULL,
  boss_kills INTEGER NOT NULL,
  win INTEGER NOT NULL,
  created_at INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_runs_user ON runs(user_id);
CREATE TABLE IF NOT EXISTS player_state(
  user_id INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
  state TEXT NOT NULL,
  updated_at INTEGER NOT NULL
);
`);

/* 定期清理过期 session */
setInterval(() => {
  try { db.prepare("DELETE FROM sessions WHERE expires_at<?").run(Date.now()); } catch (e) { /* 忽略 */ }
}, 3600000).unref();

module.exports = db;