import { Request, Response } from 'express'

import { Note, Revision } from '../../models'
import { logger } from '../../logger'
import { config } from '../../config'
import { errors } from '../../errors'
import shortId from 'shortid'
import moment from 'moment'
import querystring from 'querystring'

export function getInfo (req: Request, res: Response, note: Note): void {
  const body = note.content
  const extracted = Note.extractMeta(body)
  const markdown = extracted.markdown
  const meta = Note.parseMeta(extracted.meta)
  const title = Note.decodeTitle(note.title)
  const data = {
    title: meta.title || title,
    description: meta.description || (markdown ? Note.generateDescription(markdown) : null),
    viewcount: note.viewcount,
    createtime: note.createdAt,
    updatetime: note.lastchangeAt
  }
  res.set({
    'Access-Control-Allow-Origin': '*', // allow CORS as API
    'Access-Control-Allow-Headers': 'Range',
    'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
    'Cache-Control': 'private', // only cache by client
    'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
  })
  res.send(data)
}

export function createGist (req: Request, res: Response, note: Note): void {
  const data = {
    // eslint-disable-next-line @typescript-eslint/camelcase
    client_id: config.github.clientID,
    // eslint-disable-next-line @typescript-eslint/camelcase
    redirect_uri: config.serverURL + '/auth/github/callback/' + Note.encodeNoteId(note.id) + '/gist',
    scope: 'gist',
    state: shortId.generate()
  }
  const query = querystring.stringify(data)
  res.redirect('https://github.com/login/oauth/authorize?' + query)
}

export function getRevision (req: Request, res: Response, note: Note): void {
  const actionId = req.params.actionId
  if (actionId) {
    const time = moment(parseInt(actionId))
    if (time.isValid()) {
      Revision.getPatchedNoteRevisionByTime(note, time, function (err, content) {
        if (err) {
          logger.error(err)
          errors.errorInternalError(res)

          return
        }
        if (!content) {
          errors.errorNotFound(res)
          return
        }
        res.set({
          'Access-Control-Allow-Origin': '*', // allow CORS as API
          'Access-Control-Allow-Headers': 'Range',
          'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
          'Cache-Control': 'private', // only cache by client
          'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
        })
        res.send(content)
      })
    } else {
      errors.errorNotFound(res)
    }
  } else {
    Revision.getNoteRevisions(note, function (err, data) {
      if (err) {
        logger.error(err)
        errors.errorInternalError(res)
        return
      }
      const out = {
        revision: data
      }
      res.set({
        'Access-Control-Allow-Origin': '*', // allow CORS as API
        'Access-Control-Allow-Headers': 'Range',
        'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
        'Cache-Control': 'private', // only cache by client
        'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
      })
      res.send(out)
    })
  }
}