import Database from 'better-sqlite3'
import { resolve } from 'path'

// 싱글톤 DB 인스턴스
let db: Database.Database | null = null

export function getDb(): Database.Database {
  if (!db) {
    const dbPath = resolve(process.cwd(), 'database/osolit-monitor.db')
    db = new Database(dbPath)
    db.pragma('journal_mode = WAL')
  }
  return db
}

export function initPubnetTables(): void {
  const db = getDb()

  db.exec(`
    CREATE TABLE IF NOT EXISTS pubnet_targets (
      id          INTEGER PRIMARY KEY AUTOINCREMENT,
      name        TEXT NOT NULL,
      url         TEXT NOT NULL UNIQUE,
      is_active   INTEGER DEFAULT 1,
      sort_order  INTEGER DEFAULT 0,
      created_at  TEXT DEFAULT (datetime('now', 'localtime')),
      updated_at  TEXT DEFAULT (datetime('now', 'localtime'))
    )
  `)

  db.exec(`
    CREATE TABLE IF NOT EXISTS pubnet_logs (
      id              INTEGER PRIMARY KEY AUTOINCREMENT,
      target_id       INTEGER NOT NULL,
      is_success      INTEGER NOT NULL,
      checked_at      TEXT DEFAULT (datetime('now', 'localtime')),
      FOREIGN KEY (target_id) REFERENCES pubnet_targets(id)
    )
  `)

  db.exec(`
    CREATE TABLE IF NOT EXISTS pubnet_status (
      id                  INTEGER PRIMARY KEY CHECK (id = 1),
      current_index       INTEGER DEFAULT 0,
      check_interval      INTEGER DEFAULT 300000,
      is_healthy          INTEGER DEFAULT 1,
      last_target_id      INTEGER,
      last_checked_at     TEXT,
      scheduler_running   INTEGER DEFAULT 0,
      updated_at          TEXT DEFAULT (datetime('now', 'localtime'))
    )
  `)

  const statusExists = db.prepare('SELECT COUNT(*) as cnt FROM pubnet_status').get() as { cnt: number }
  if (statusExists.cnt === 0) {
    db.prepare('INSERT INTO pubnet_status (id) VALUES (1)').run()
  }

  console.log('[DB] pubnet tables initialized')
}

export function initPrivnetTables(): void {
  const db = getDb()

  db.exec(`
    CREATE TABLE IF NOT EXISTS privnet_targets (
      id          INTEGER PRIMARY KEY AUTOINCREMENT,
      name        TEXT NOT NULL,
      url         TEXT NOT NULL UNIQUE,
      is_active   INTEGER DEFAULT 1,
      sort_order  INTEGER DEFAULT 0,
      created_at  TEXT DEFAULT (datetime('now', 'localtime')),
      updated_at  TEXT DEFAULT (datetime('now', 'localtime'))
    )
  `)

  db.exec(`
    CREATE TABLE IF NOT EXISTS privnet_logs (
      id              INTEGER PRIMARY KEY AUTOINCREMENT,
      target_id       INTEGER NOT NULL,
      is_success      INTEGER NOT NULL,
      checked_at      TEXT DEFAULT (datetime('now', 'localtime')),
      FOREIGN KEY (target_id) REFERENCES privnet_targets(id)
    )
  `)

  db.exec(`
    CREATE TABLE IF NOT EXISTS privnet_status (
      id                  INTEGER PRIMARY KEY CHECK (id = 1),
      current_index       INTEGER DEFAULT 0,
      check_interval      INTEGER DEFAULT 300000,
      is_healthy          INTEGER DEFAULT 1,
      last_target_id      INTEGER,
      last_checked_at     TEXT,
      scheduler_running   INTEGER DEFAULT 0,
      updated_at          TEXT DEFAULT (datetime('now', 'localtime'))
    )
  `)

  const statusExists = db.prepare('SELECT COUNT(*) as cnt FROM privnet_status').get() as { cnt: number }
  if (statusExists.cnt === 0) {
    db.prepare('INSERT INTO privnet_status (id) VALUES (1)').run()
  }

  console.log('[DB] privnet tables initialized')
}

export function closeDb(): void {
  if (db) {
    db.close()
    db = null
  }
}