/**
 * 文件存储工具
 * 将表单数据追加写入 server/storage/ 目录下的 JSON 文件
 */

import { promises as fs } from 'fs'
import { resolve } from 'path'

const STORAGE_DIR = resolve(process.cwd(), 'server/storage')

/**
 * 确保存储目录存在
 */
async function ensureDir() {
  try {
    await fs.mkdir(STORAGE_DIR, { recursive: true })
  } catch {
    // 目录已存在，忽略
  }
}

/**
 * 将记录追加到指定文件
 * @param {string} filename - 不含路径，如 'customize.json'
 * @param {object} record
 */
export async function appendRecord(filename, record) {
  await ensureDir()
  const filepath = resolve(STORAGE_DIR, filename)

  let records = []
  try {
    const raw = await fs.readFile(filepath, 'utf-8')
    records = JSON.parse(raw)
  } catch {
    // 文件不存在或解析失败，从空数组开始
  }

  records.push(record)
  await fs.writeFile(filepath, JSON.stringify(records, null, 2), 'utf-8')
  return record
}

/**
 * 读取所有记录（管理员用）
 * @param {string} filename
 */
export async function readRecords(filename) {
  const filepath = resolve(STORAGE_DIR, filename)
  try {
    const raw = await fs.readFile(filepath, 'utf-8')
    return JSON.parse(raw)
  } catch {
    return []
  }
}