import http from 'http'
import https from 'https'
import fs from 'iofs'
import { join, resolve, dirname } from 'path'
import { parse } from 'url'
import socket from './ws.js'
import chokidar from 'chokidar'

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 = {}
const CACHE = {} //文件缓存, 用于hmr

export default async 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'

  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)
    }
  }

  const server = (USE_HTTPS ? https : http)
    .createServer(SERVER_OPTIONS)
    .listen(PORT)

  const ws = socket(server)

  let indexPage = Object.keys(conf.pages)
    .map(it => {
      let tmp = it + '.html'
      return `<li><a href="/${tmp}">${tmp}</a></li>`
    })
    .join('')

  let ready = false
  let pagesDir = '',
    currentPage = ''

  server
    .on('request', function (req, res) {
      let pathname = parse(req.url.slice(1)).pathname
      let pageName = '',
        isIndex = false // 是否渲染目录页
      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 {
          if (currentPage) {
            ext = pathname.at(-1).split('.').pop()
            pageName = currentPage
          } else {
            pageName = Object.keys(conf.pages).pop()
            currentPage = pageName
            pagesDir = dirname(conf.pages[pageName].entry)
            ext = 'html'
          }
        }
        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'
        }
      }
      // 修正history路由时的访问
      if (pathname === ext) {
        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,
                CACHE
              })

              res.setHeader('content-type', MIME_TYPES.js)
            }
            break

          case 'scss':
          case 'css':
            {
              let file = join(
                root,
                pathname
                  .replace(/^assets\/css\//, '')
                  .replace(/^assets\/js\//, '')
              )
              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)
      }
    })

    .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
      )
    })

  chokidar
    .watch([root, join(root, '../index.html')])
    .on('all', (act, filePath) => {
      if (ready) {
        let file = filePath.slice(root.length)

        if (act === 'add' || act === 'change') {
          let ext = file.slice(file.lastIndexOf('.') + 1)

          switch (ext) {
            case 'css':
            case 'scss':
              {
                let content = fs.cat(filePath).toString()
                ws.send({ action: 'render', data: { path: file, content } })
              }
              break

            case 'vue':
              {
                // console.log('>>>>', file)
                let content = compileVue(filePath, conf.imports, {
                  IS_MPA,
                  currentPage,
                  root,
                  pagesDir,
                  CACHE
                })
                let tmp = CACHE[filePath]
                // console.log(tmp);
                if (tmp.changed) {
                  console.log('需要刷新了')
                  ws.send({ action: 'reload' })
                } else {
                  ws.send({
                    action: 'render',
                    data: { path: file, content: tmp.css }
                  })
                }
              }
              break

            default:
              ws.send({ action: 'reload' })
              break
          }
        } else if (act === 'unlink' || act === 'unlinkDir') {
          ws.send({ action: 'reload' })
        }
      }
    })
    .on('ready', () => {
      ready = true
    })
}