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

// 确保数据目录存在
const dataDir = '/app/data';
if (!fs.existsSync(dataDir)) {
  fs.mkdirSync(dataDir, { recursive: true });
}

const dbPath = path.join(dataDir, 'xiaocai.db');
const db = new Database(dbPath);


// 启用 WAL 模式提升并发
db.pragma('journal_mode = WAL');

// 创建表
db.exec(`
  CREATE TABLE IF NOT EXISTS users (
    username TEXT PRIMARY KEY,
    password TEXT NOT NULL,
    is_admin INTEGER DEFAULT 0
  );

  CREATE TABLE IF NOT EXISTS rooms (
    id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    created_by TEXT NOT NULL,
    white_list TEXT DEFAULT '',  -- 逗号分隔用户名，空表示所有人
    created_at TEXT DEFAULT (datetime('now','localtime'))
  );

  CREATE TABLE IF NOT EXISTS messages (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    room_id TEXT NOT NULL,
    user TEXT NOT NULL,
    text TEXT,
    attachments TEXT,  -- JSON array of file paths
    timestamp TEXT DEFAULT (datetime('now','localtime')),
    FOREIGN KEY(room_id) REFERENCES rooms(id)
  );

  CREATE TABLE IF NOT EXISTS purchases (
    id TEXT PRIMARY KEY,
    room_id TEXT NOT NULL,
    item TEXT,
    amount REAL,
    method TEXT,
    status TEXT DEFAULT '待处理',
    applicant TEXT,
    created_at TEXT DEFAULT (datetime('now','localtime')),
    updated_at TEXT DEFAULT (datetime('now','localtime')),
    ai_notes TEXT,
    FOREIGN KEY(room_id) REFERENCES rooms(id)
  );

  CREATE TABLE IF NOT EXISTS purchase_history (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    purchase_id TEXT NOT NULL,
    action TEXT NOT NULL,
    user TEXT NOT NULL,
    timestamp TEXT DEFAULT (datetime('now','localtime')),
    attachments TEXT,
    FOREIGN KEY(purchase_id) REFERENCES purchases(id)
  );

  CREATE TABLE IF NOT EXISTS purchase_attachments (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    purchase_id TEXT NOT NULL,
    file_path TEXT NOT NULL,
    uploaded_by TEXT NOT NULL,
    timestamp TEXT DEFAULT (datetime('now','localtime')),
    FOREIGN KEY(purchase_id) REFERENCES purchases(id)
  );
`);

module.exports = db;