import fs from 'fs'
import path from 'path'

let mockData: Record<string, any> = {}

fs.watch(path.resolve(__dirname, '..', 'mock'), update)

async function getMockData(p = path.resolve(__dirname, '..', 'mock')) {
  mockData = {}
  const files = fs.readdirSync(p)
  for (const file of files) {
    const absolutePath = path.join(p, file)
    if (!fs.existsSync(absolutePath)) {
      continue
    }
    const stat = fs.statSync(absolutePath)
    if (stat.isDirectory()) {
      await getMockData(path.join(p, absolutePath))
    } else if (stat.isFile()) {
      try {
        const code = fs.readFileSync(absolutePath).toString()
        const module = eval(code)
        if (!module.enable) {
          return
        }
        const keys = Object.keys(module)
        keys.forEach((key) => {
          mockData[key] = module[key]
        })
      } catch (e) {
        console.log(e)
      }
    }
  }
}

const proxy = {
  '^/api': {
    // @ts-ignore
    bypass: async function (req, res, proxyOptions) {
      res.setHeader('Content-Type', 'application/json;charset=utf-8')
      const { url = '' } = req
      if (!url.startsWith('/api') || !mockData[url]) {
        return res
      }
      const data = mockData[url]
      if (typeof data === 'function') {
        if (data.length) {
          data(req, res)
          return res
        } else {
          res.end(JSON.stringify(data()))
        }
      } else {
        res.end(JSON.stringify(mockData[url]))
      }
      return res
    },
  },
}

async function update() {
  await getMockData()
}

update()
export default proxy