/**
 * SQLite 数据层（§4.1）
 * 表：settings / ignored_packages / logs
 */
import Database from 'better-sqlite3'
import fs from 'node:fs'
import path from 'node:path'
import { fileURLToPath } from 'node:url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
// 数据目录：环境变量 DATA_DIR 可覆盖（Docker 挂载 manager-data）
const DATA_DIR = process.env.DATA_DIR || path.join(__dirname, 'data')
fs.mkdirSync(DATA_DIR, { recursive: true })

const db = new Database(path.join(DATA_DIR, 'manager.db'))
db.pragma('journal_mode = WAL')

db.exec(`
CREATE TABLE IF NOT EXISTS settings (
  key   TEXT PRIMARY KEY,
  value TEXT
);
CREATE TABLE IF NOT EXISTS ignored_packages (
  pkg_name   TEXT PRIMARY KEY,
  ignored_at DATETIME DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS logs (
  id               INTEGER PRIMARY KEY AUTOINCREMENT,
  action           TEXT DEFAULT 'clean',
  pkg_name         TEXT,
  deleted_versions TEXT,
  deleted_count    INTEGER,
  freed_space      TEXT,
  created_at       DATETIME DEFAULT CURRENT_TIMESTAMP
);
`)

// 旧库迁移：早期 logs 表无 action 列，运行时补齐（忽略/取消忽略等操作依赖该列区分类型）
const logCols = db.prepare('PRAGMA table_info(logs)').all().map(c => c.name)
if (!logCols.includes('action')) {
  db.exec("ALTER TABLE logs ADD COLUMN action TEXT DEFAULT 'clean'")
}

// —— settings ——
export function getSetting(key, def = null) {
  const row = db.prepare('SELECT value FROM settings WHERE key = ?').get(key)
  return row ? row.value : def
}

export function setSetting(key, value) {
  db.prepare(
    'INSERT INTO settings (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value = excluded.value',
  ).run(key, String(value))
}

// —— ignored ——
export function getIgnored() {
  return db.prepare('SELECT pkg_name FROM ignored_packages ORDER BY ignored_at DESC').all().map(r => r.pkg_name)
}

export function getIgnoredRows() {
  return db.prepare('SELECT pkg_name, ignored_at FROM ignored_packages ORDER BY ignored_at DESC').all()
}

export function isIgnored(pkgName) {
  return !!db.prepare('SELECT 1 FROM ignored_packages WHERE pkg_name = ?').get(pkgName)
}

export function addIgnored(pkgName) {
  db.prepare(
    'INSERT INTO ignored_packages (pkg_name) VALUES (?) ON CONFLICT(pkg_name) DO NOTHING',
  ).run(pkgName)
}

export function removeIgnored(pkgName) {
  db.prepare('DELETE FROM ignored_packages WHERE pkg_name = ?').run(pkgName)
}

// —— logs ——
export function addLog({ action = 'clean', pkgName, deletedVersions = null, deletedCount = 0, freedSpace = null }) {
  const info = db.prepare(
    'INSERT INTO logs (action, pkg_name, deleted_versions, deleted_count, freed_space) VALUES (?, ?, ?, ?, ?)',
  ).run(action, pkgName, deletedVersions, deletedCount, freedSpace)
  return info.lastInsertRowid
}

export function getLogs(limit = 50) {
  return db.prepare(
    'SELECT * FROM logs ORDER BY id DESC LIMIT ?',
  ).all(limit)
}

export default db