const fs = require('fs')
const path = require('path')
const React = require('react')
const ReactDOMServer = require('react-dom/server')
const getFileStats = require('./getFileStats')
const IndexPage = require('../components/IndexPage')

const e = React.createElement

function getEntries(dir) {
  return new Promise((resolve, reject) => {
    fs.readdir(dir, function(error, files) {
      if (error) {
        reject(error)
      } else {
        resolve(
          Promise.all(
            files.map(file => getFileStats(path.join(dir, file)))
          ).then(statsArray => {
            return statsArray.map((stats, index) => {
              return { file: files[index], stats }
            })
          })
        )
      }
    })
  })
}

const DOCTYPE = '<!DOCTYPE html>'

function createHTML(props) {
  return DOCTYPE + ReactDOMServer.renderToStaticMarkup(e(IndexPage, props))
}

function getIndexHTML(packageInfo, version, baseDir, dir, callback) {
  getEntries(path.join(baseDir, dir))
    .then(entries => createHTML({ packageInfo, version, dir, entries }))
    .then(html => callback(null, html), callback)
}

module.exports = getIndexHTML