const express = require('express')
const bodyParser = require('body-parser')
const { vueRenderer } = require('@doweb/vuexpress')
const slugify = require('underscore.string/slugify')
const fs = require('fs')

const { Seance } = require ('./seance')

const app = express()
var expressWs = require('express-ws')(app)

// ALlow URLencoded API
app.use(bodyParser.urlencoded({
   extended: false
}))

// Allow JSON API
app.use(bodyParser('json'))

// Enable static files
app.use(express.static('public'))
app.use(express.static('static'))

// Set up VueXpress
let options = {
  views: './views',
  cache: true,
  watch: true,
  metaInfo: {
    title: 'Seance',
    script: [
      { type: 'text/javascript', src: '/app.js' },
    ],
  },
  extractCSS: true,
  cssOutputPath: '/css/styles.css',
  publicPath: 'public',
  compilerConfig: {
      // custom webpack config
  },
  compilerConfigCallback: function(webpackConfig) {
      // change the merged webpackconfig if you like
      return webpackConfig;
  },
  
}

const renderer = vueRenderer(options)
app.use(renderer)

// Views

app.get('/', (req, res) => {
  res.render('index', {
    baseUrl: req.hostname.startsWith('localhost')
      ? req.protocol + '://' + req.headers.host
      : '//' + req.hostname, // auto choose http or https
  })
})

app.post('/fetch', (req, res) => {
  var json
  var post

  try {
    json = JSON.parse(req.body.data)
  } catch (err) {
    console.log(err)
  }

  if (json) {
    post = json.payload.value
    console.log(post)

    // set author
    post.author = post.displayAuthor

    // If the author's not available, get it from somewhere else
    // function courtesy mediumexporter
    let authors = []
    if (json.payload.references && json.payload.references.User) {
      Object.keys(json.payload.references.User).forEach(k => {
        let u = json.payload.references.User[k]
        authors.push({
          name: u.name,
          username: u.username,
          userId: u.userId
        })
      })
      post.authors = authors

      if (!post.author) {
        post.author = authors[0].name
      }
    }

    // set featured image
    if (post.virtuals.previewImage) {
      post.featuredImage = 'https://cdn-images-1.medium.com/max/800/' + post.virtuals.previewImage.imageId
    }

    // set ID
    if (!post.slug) {
      post.slug = slugify(post.title)
    }

    // save to disk
    fs.writeFileSync(`${post.slug}.json`, JSON.stringify(json), 'utf-8')
  }

  // render the final post
  res.render('fetch-medium', {
    post: {
      title: post.title,
      subtitle: post.content.subtitle,
      author: post.author,
      featuredImage: post.featuredImage,
      mediumUrl: post.mediumUrl,
      slug: post.slug,
    }
  })
})

app.get('/fetch', (req, res) => {
  res.redirect(303, '/')
})

app.get('/api', (req, res) => {
  res.json({
    status: 'success',
    message: 'Welcome to the Seance API :)',
  })
})

app.ws('/ws/fetch-medium', (ws, req) => {
  ws.on('message', async(msg) => {

    command = msg.split(' ')
    if (command.length == 3 && command[0] == 'fetch') {
      const postSlug = command[1]
      const password = command[2]

      if (password != process.env.SEANCE_PW) {
        ws.send('error: Something went wrong. Please try again :(')
        return
      }

      const postMetaFile = `${postSlug}.json`

      if (!fs.existsSync(postMetaFile)) {
        ws.send(`error: post ${postSlug} not yet loaded`)
        return
      }

      // Start the Seance session
      seance = new Seance()

      // set up handlers
      seance.on('update', (e) => {
        ws.send(`update: ${e.message}`)
      })

      seance.on('notification', (e) => {
        ws.send(`notification: ${e.message}`)
      })

      seance.on('error', (e) => {
        ws.send(`error: ${e.message}`)
      })

      seance.fetchFromMedium(postMetaFile)
      .then((post) => {
        console.info(`"${post.title}" fetched successfully.`)
        ws.send(`done: ${post.slug}`)
      })
    }

  })

  ws.on('close', () => {
    console.log('socket closed')
  })
})

app.ws('/ws/push-ghost', (ws, req) => {
  ws.on('message', async(msg) => {

    // respond to keepalive
    if (msg == '__ping__') {
      ws.send('__pong__')
      return
    }

    command = msg.split(' ')
    if (command.length == 3 && command[0] == 'push') {
      let postSlug = command[1]

      // check password
      if (command[2] != process.env.SEANCE_PW) {
        ws.send('error: Something went wrong. Please try again :(')
        return
      }

      // Start the Seance session
      seance = new Seance()

      // catch data
      let postId

      // set up handlers
      seance.on('update', (e) => {
        ws.send(`update: ${e.message}`)
      })

      seance.on('notification', (e) => {
        ws.send(`notification: ${e.message}`)
      })

      seance.on('error', (e) => {
        ws.send(`error: ${e.message}`)
      })

      // run seance and wait till it finishes
      let res = await seance.pushToGhost(postSlug)

      console.info(`"${postSlug}" pushed successfully.`)

      // send 'done' message
      let ghostSite = await seance.ghostAdmin.site.read()

      let postEditUrl
      if (!!res.id) postEditUrl = `${ghostSite.url}ghost/#/editor/post/${res.id}`
      if (!!res.slug) postSlug = res.slug
      ws.send(`done: ${postSlug} ${postEditUrl}`)

    } else {
      ws.send('error: Malformed message')
      return
    }

  })

  ws.on('close', () => {
    console.log('socket closed')
  })
})

const port = process.env.PORT || 4000
app.listen(port, () => {
  console.log(`Listening on ${port}`)
})