import http from 'http'
import https from 'https'
import fs from 'iofs'
import { join, resolve, dirname } from 'path'
import { parse } from 'url'

import { compileScss, parseJs, compileVue, parseHtml } from './compile-vue.js'

import MIME_TYPES from './mime-tpyes.js'
import { COMMON_HEADERS } from './constants.js'

const noc = Buffer.from('')
const SERVER_OPTIONS = {}

export default function createServer(root = '', conf = {}) {
  const IS_MPA = Object.keys(conf.pages).length > 1
  const PORT = conf.devServer.port || 8080
  const USE_HTTPS = conf.devServer.https
  const DOMAIN = conf.devServer.domain || 'localhost'
  const WEB_SERVER = USE_HTTPS ? https : http
  let indexPage = Object.keys(conf.pages)
    .map(it => {
      let tmp = it + '.html'
      return `<li><a href="/${tmp}">${tmp}</a></li>`
    })
    .join('')

  let pagesDir = '',
    currentPage = ''

  if (USE_HTTPS) {
    Object.assign(SERVER_OPTIONS, conf.devServer.ssl)

    if (!SERVER_OPTIONS.key || !SERVER_OPTIONS.cert) {
      console.error('证书错误: https 证书不能为空!!!\n')
      process.exit(1)
    }
  }

  WEB_SERVER.createServer(SERVER_OPTIONS, function (req, res) {
    let pathname = parse(req.url.slice(1)).pathname
    let pageName = '',
      isIndex = false
    let ext

    if (pathname) {
      pathname = pathname.split('/')

      if (pathname[0].endsWith('.html')) {
        pageName = pathname.shift()

        let tmp = pageName.split('.')

        ext = tmp.pop()
        pageName = tmp.join('.')

        currentPage = pageName
        pagesDir = dirname(conf.pages[pageName].entry)
      } else {
        ext = pathname.at(-1).split('.').pop()
        pageName = currentPage
      }
      pathname = pathname.join('/')
    } else {
      if (IS_MPA) {
        isIndex = true
      } else {
        pageName = Object.keys(conf.pages).pop()
        currentPage = pageName
        pagesDir = dirname(conf.pages[pageName].entry)
        ext = 'html'
      }
    }

    for (let k in COMMON_HEADERS) {
      res.setHeader(k, COMMON_HEADERS[k])
    }

    if (isIndex) {
      res.setHeader('content-type', MIME_TYPES.html)
      res.writeHead(200, 'OK')
      res.end('<ul>' + indexPage + '</ul>')
    } else {
      res.setHeader('accept-ranges', 'bytes')

      let code = ''

      switch (ext) {
        case 'html':
          {
            res.setHeader('content-type', MIME_TYPES.html)

            let page = conf.pages[pageName]
            let entry = fs.cat(page.entry).toString()
            let html = fs.cat(join(process.cwd(), 'index.html')).toString()

            entry = parseJs(entry, conf.imports, { IS_MPA, currentPage })

            code = parseHtml(html, { page, imports: conf.imports, entry })
          }

          break

        case 'vue':
          {
            let rpath = pathname.replace(/^assets\/js\//, '')
            let file

            if (IS_MPA) {
              file = join(pagesDir, rpath)
            } else {
              file = join(root, rpath)
            }
            if (!fs.isfile(file)) {
              file = file.replace(/\.vue$/, '/index.vue')
            }

            // console.log('>>>>', file)
            code = compileVue(file, conf.imports, { IS_MPA, currentPage, root, pagesDir })
            res.setHeader('content-type', MIME_TYPES.js)
          }
          break

        case 'scss':
        case 'css':
          {
            let file = join(root, pathname.replace(/^assets\/css\//, ''))
            code = compileScss(file)
            res.setHeader('content-type', MIME_TYPES.css)
          }
          break

        case 'js':
          {
            pathname = pathname.replace(/^assets\/js\//, '')
            let file
            if (pathname.startsWith(currentPage)) {
              file = join(pagesDir, pathname)
            } else {
              file = join(root, pathname)
            }
            if (fs.isfile(file)) {
              code = fs.cat(file)
            } else {
              file = file.replace(/\.js$/, '/index.js')
              code = fs.cat(file)
            }
            code = parseJs(code + '', conf.imports, { IS_MPA, currentPage })
            res.setHeader('content-type', MIME_TYPES.js)
          }

          break

        case 'png':
        case 'jpg':
        case 'jpeg':
        case 'webp':
        case 'gif':
        case 'svg':
        case 'ico':
        case 'bmp':
          res.setHeader('content-type', MIME_TYPES[ext])
          code = fs.cat(join(root, pathname))
          if (code === null) {
            console.error(pathname, '文件不存在')
            res.writeHead(404, 'Not Found')
            res.end('')
            return
          }
          break

        default:
          res.setHeader('content-type', MIME_TYPES[ext] || MIME_TYPES.html)
          break
      }

      res.setHeader('content-length', Buffer.byteLength(code || noc))
      res.writeHead(200, 'OK')
      res.end(code || noc)
    }
  })
    .listen(PORT)
    .on('error', err => {
      console.log(`${PORT}端口被占用~~~`)
      conf.devServer.port = PORT + 1
      createServer(root, conf)
    })
    .on('listening', _ => {
      console.log('启动成功, 可通过以下地址访问')
      console.log('  本地: %s://%s:%d', USE_HTTPS ? 'https' : 'http', '127.0.0.1', PORT)
      console.log('  外网: %s://%s:%d\n', USE_HTTPS ? 'https' : 'http', DOMAIN, PORT)
    })
}