/**
 * 数据库初始化 — 建表 + 种子数据
 */
const Database = require('better-sqlite3');
const path = require('path');
require('dotenv').config({ path: path.join(__dirname, '..', '.env') });

const dbPath = path.resolve(__dirname, '..', process.env.DB_PATH || 'db/monitor.sqlite');
const db = new Database(dbPath);

db.pragma('journal_mode = WAL');
db.pragma('foreign_keys = ON');

db.exec(`
  -- ========== 商家 ==========
  CREATE TABLE IF NOT EXISTS merchants (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    name          TEXT    NOT NULL,
    website       TEXT,
    notes         TEXT,
    created_at    TEXT    DEFAULT (datetime('now')),
    updated_at    TEXT    DEFAULT (datetime('now'))
  );

  -- ========== 产品 ==========
  CREATE TABLE IF NOT EXISTS products (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    merchant_id   INTEGER NOT NULL REFERENCES merchants(id) ON DELETE CASCADE,
    name          TEXT    NOT NULL,
    url           TEXT,
    sku           TEXT,
    price         TEXT,
    in_stock      INTEGER DEFAULT 0,   -- 0=未知 1=有货 2=缺货
    last_checked  TEXT,
    notes         TEXT,
    created_at    TEXT    DEFAULT (datetime('now')),
    updated_at    TEXT    DEFAULT (datetime('now'))
  );

  -- ========== Aff 链接 ==========
  CREATE TABLE IF NOT EXISTS aff_links (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    product_id    INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
    platform      TEXT    NOT NULL DEFAULT 'default',  -- e.g. default / telegram / twitter
    url           TEXT    NOT NULL,
    notes         TEXT,
    created_at    TEXT    DEFAULT (datetime('now'))
  );

  -- ========== Telegram 频道配置 ==========
  CREATE TABLE IF NOT EXISTS tg_channels (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    name          TEXT    NOT NULL,
    chat_id       TEXT    NOT NULL,
    enabled       INTEGER DEFAULT 1,
    notes         TEXT,
    created_at    TEXT    DEFAULT (datetime('now'))
  );

  -- ========== 监控任务 ==========
  CREATE TABLE IF NOT EXISTS monitor_tasks (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    product_id    INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
    tg_channel_id INTEGER REFERENCES tg_channels(id) ON DELETE SET NULL,
    cron_expr     TEXT    DEFAULT '*/5 * * * *',
    enabled       INTEGER DEFAULT 1,
    last_run      TEXT,
    created_at    TEXT    DEFAULT (datetime('now'))
  );

  -- ========== 检测记录 ==========
  CREATE TABLE IF NOT EXISTS check_logs (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    task_id       INTEGER NOT NULL REFERENCES monitor_tasks(id) ON DELETE CASCADE,
    product_id    INTEGER NOT NULL,
    status        TEXT    NOT NULL,  -- in_stock / out_of_stock / error
    message       TEXT,
    notified      INTEGER DEFAULT 0,
    created_at    TEXT    DEFAULT (datetime('now'))
  );

  CREATE INDEX IF NOT EXISTS idx_check_logs_task   ON check_logs(task_id);
  CREATE INDEX IF NOT EXISTS idx_check_logs_date   ON check_logs(created_at);
  CREATE INDEX IF NOT EXISTS idx_products_merchant  ON products(merchant_id);
`);

console.log('✅ 数据库初始化完成:', dbPath);

// 种子数据（仅当 merchants 为空时插入）
const count = db.prepare('SELECT count(*) AS c FROM merchants').get().c;
if (count === 0) {
  const insertMerchant = db.prepare('INSERT INTO merchants (name, website, notes) VALUES (?, ?, ?)');
  const insertProduct  = db.prepare('INSERT INTO products (merchant_id, name, url, price) VALUES (?, ?, ?, ?)');
  const insertChannel  = db.prepare('INSERT INTO tg_channels (name, chat_id) VALUES (?, ?)');

  db.transaction(() => {
    insertMerchant.run('示例商家 A', 'https://example-a.com', '这是一个演示商家');
    insertMerchant.run('示例商家 B', 'https://example-b.com', null);
    insertProduct.run(1, 'VPS 套餐 Basic', 'https://example-a.com/vps-basic', '$4.99/mo');
    insertProduct.run(1, 'VPS 套餐 Pro',   'https://example-a.com/vps-pro',   '$9.99/mo');
    insertProduct.run(2, '独服 E3',         'https://example-b.com/dedi-e3',   '€29/mo');
    insertChannel.run('测试频道', '-1001234567890');
  })();

  console.log('🌱 种子数据已插入');
}

db.close();