import { NextFunction, Request, Response } from 'express'
import { NoteUtils } from './util'
import * as ActionController from './actions'
import { errors } from '../../errors'
import { config } from '../../config'
import { logger } from '../../logger'
import { User, Note } from '../../models'

export module NoteController {
  export function publishNoteActions (req: any, res: Response, next: NextFunction) {
    NoteUtils.findNoteOrCreate(req, res, function (note) {
      const action = req.params.action
      switch (action) {
        case 'download':
          exports.downloadMarkdown(req, res, note)
          break
        case 'edit':
          res.redirect(config.serverURL + '/' + (note.alias ? note.alias : Note.encodeNoteId(note.id)) + '?both')
          break
        default:
          res.redirect(config.serverURL + '/s/' + note.shortid)
          break
      }
    })
  }

  export function showPublishNote (req: any, res: Response, next: NextFunction) {
    const include = [{
      model: User,
      as: 'owner'
    }, {
      model: User,
      as: 'lastchangeuser'
    }]
    NoteUtils.findNoteOrCreate(req, res, function (note) {
      // force to use short id
      const shortid = req.params.shortid
      if ((note.alias && shortid !== note.alias) || (!note.alias && shortid !== note.shortid)) {
        return res.redirect(config.serverURL + '/s/' + (note.alias || note.shortid))
      }
      note.increment('viewcount').then(function (note) {
        if (!note) {
          return errors.errorNotFound(res)
        }
        NoteUtils.getPublishData(req, res, note, (data) => {
          res.set({
            'Cache-Control': 'private' // only cache by client
          })
          return res.render('pretty.ejs', data)
        })
      }).catch(function (err) {
        logger.error(err)
        return errors.errorInternalError(res)
      })
    }, include)
  }

  export function showNote (req: any, res: Response, next: NextFunction) {
    NoteUtils.findNoteOrCreate(req, res, function (note) {
      // force to use note id
      const noteId = req.params.noteId
      const id = Note.encodeNoteId(note.id)
      if ((note.alias && noteId !== note.alias) || (!note.alias && noteId !== id)) {
        return res.redirect(config.serverURL + '/' + (note.alias || id))
      }
      const body = note.content
      const extracted = Note.extractMeta(body)
      const meta = Note.parseMeta(extracted.meta)
      let title = Note.decodeTitle(note.title)
      title = Note.generateWebTitle(meta.title || title)
      const opengraph = Note.parseOpengraph(meta, title)
      res.set({
        'Cache-Control': 'private', // only cache by client
        'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
      })
      return res.render('codimd.ejs', {
        title: title,
        opengraph: opengraph
      })
    })
  }

  export function createFromPOST (req: any, res: Response, next: NextFunction) {
    let body = ''
    if (req.body && req.body.length > config.documentMaxLength) {
      return errors.errorTooLong(res)
    } else if (req.body) {
      body = req.body
    }
    body = body.replace(/[\r]/g, '')
    return NoteUtils.newNote(req, res, body)
  }

  export function doAction (req: any, res: Response, next: NextFunction) {
    const noteId = req.params.noteId
    NoteUtils.findNoteOrCreate(req, res, (note) => {
      const action = req.params.action
      // TODO: Don't switch on action, choose action in Router and use separate functions
      switch (action) {
        case 'publish':
        case 'pretty': // pretty deprecated
          res.redirect(config.serverURL + '/s/' + (note.alias || note.shortid))
          break
        case 'slide':
          res.redirect(config.serverURL + '/p/' + (note.alias || note.shortid))
          break
        case 'download':
          exports.downloadMarkdown(req, res, note)
          break
        case 'info':
          ActionController.getInfo(req, res, note)
          break
        case 'gist':
          ActionController.createGist(req, res, note)
          break
        case 'revision':
          ActionController.getRevision(req, res, note)
          break
        default:
          return res.redirect(config.serverURL + '/' + noteId)
      }
    })
  }

  export function downloadMarkdown (req: Request, res: Response, note: any) {
    const body = note.content
    let filename = Note.decodeTitle(note.title)
    filename = encodeURIComponent(filename)
    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',
      'Content-Type': 'text/markdown; charset=UTF-8',
      'Cache-Control': 'private',
      'Content-disposition': 'attachment; filename=' + filename + '.md',
      'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
    })
    res.send(body)
  }
}