import express from 'express'
import path from 'path'
import bodyParser from 'body-parser'
import * as fs from 'fs'
import { fileURLToPath } from 'url'

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)
const startup = false

const writeFile = (path, content) =>
  new Promise((resolve, reject) => {
    fs.writeFile(path, content, err => {
      if (err) {
        reject(err)
      } else {
        resolve()
      }
    })
  })

const getFilePath = (lang) => path.join(__dirname, '../src/lang', `${lang}.ts`) 
const writeLang = (name, lang) => {
  const path = getFilePath(name)
  const content = `export default ${JSON.stringify(lang)}`
  return writeFile(
    path,
    content
  )
}

export async function createServer(port) {
  if (startup) {
    return
  }

  const app = express()
  app.use('/dev', bodyParser.json())
  app.use('/dev', bodyParser.urlencoded({ extended: false }))

  app.post('/dev/langs', async function (req, res) {
    const langs = req.body
    const handlers = Object.entries(langs).map(([name, lang]) =>
      writeLang(name, lang)
    )
    Promise.all(handlers)
      .then(() => res.json({ ok: true }))
      .catch(() => res.json({ ok: false }))
  })
  app.listen(port)
  console.log('语言编辑已开启')
}