const fs = require('fs')
const http = require('http')
const path = require('path')

const port = Number(process.env.PORT || 8888)
const host = process.env.HOST || '127.0.0.1'
const root = path.resolve(__dirname, '..', 'dist')

const contentTypes = {
  '.css': 'text/css;charset=utf-8',
  '.html': 'text/html;charset=utf-8',
  '.js': 'text/javascript;charset=utf-8',
  '.jpg': 'image/jpeg',
  '.jpeg': 'image/jpeg',
  '.png': 'image/png',
  '.svg': 'image/svg+xml',
  '.ttf': 'font/ttf',
  '.webp': 'image/webp',
  '.woff': 'font/woff',
  '.woff2': 'font/woff2',
}

function sendFile(file, response) {
  fs.readFile(file, (error, data) => {
    if (error) {
      response.writeHead(404)
      response.end('Not found')
      return
    }

    response.writeHead(200, {
      'Content-Type': contentTypes[path.extname(file)] || 'application/octet-stream',
    })
    response.end(data)
  })
}

http.createServer((request, response) => {
  const cleanUrl = decodeURIComponent(request.url.split('?')[0])
  let file = path.join(root, cleanUrl === '/' ? 'index.html' : cleanUrl)

  if (!file.startsWith(root)) {
    response.writeHead(403)
    response.end('Forbidden')
    return
  }

  fs.stat(file, (error, stats) => {
    if (error || !stats.isFile()) {
      file = path.join(root, 'index.html')
    }
    sendFile(file, response)
  })
}).listen(port, host, () => {
  console.log(`萧康云医 preview http://${host}:${port}/`)
})