import { Includeable } from 'sequelize'
import { Response } from 'express'

import path from 'path'
import fs from 'fs'
import { errors } from '../../errors'
import { config } from '../../config'
import { logger } from '../../logger'
import { Note , User } from '../../models'

export module NoteUtils {
  export function findNoteOrCreate(req, res, callback: (note: any) => void, include?: Includeable[]) {
    const id = req.params.noteId || req.params.shortid
    Note.parseNoteId(id, function (err, _id) {
      if (err) {
        logger.error(err)
        return errors.errorInternalError(res)
      }
      Note.findOne({
        where: {
          id: _id
        }
      }).then(function (note) {
        if (!note) {
          return newNote(req, res, null)
        }
        if (!checkViewPermission(req, note)) {
          return errors.errorForbidden(res)
        } else {
          return callback(note)
        }
      }).catch(function (err) {
        logger.error(err)
        return errors.errorInternalError(res)
      })
    })
  }

  export function checkViewPermission (req: any, note: any) {
    if (note.permission === 'private') {
      return req.isAuthenticated() && note.ownerId === req.user.id
    } else if (note.permission === 'limited' || note.permission === 'protected') {
      return req.isAuthenticated()
    } else {
      return true
    }
  }

  export function newNote (req: any, res: Response, body: string | null) {
    let owner = null
    const noteId = req.params.noteId ? req.params.noteId : null
    if (req.isAuthenticated()) {
      owner = req.user.id
    } else if (!config.allowAnonymous) {
      return errors.errorForbidden(res)
    }
    if (config.allowFreeURL && noteId && !config.forbiddenNoteIDs.includes(noteId)) {
      req.alias = noteId
    } else if (noteId) {
      return req.method === 'POST' ? errors.errorForbidden(res) : errors.errorNotFound(res)
    }
    Note.create({
      ownerId: owner,
      alias: req.alias ? req.alias : null,
      content: body
    }).then(function (note) {
      return res.redirect(config.serverURL + '/' + (note.alias ? note.alias : Note.encodeNoteId(note.id)))
    }).catch(function (err) {
      logger.error(err)
      return errors.errorInternalError(res)
    })
  }

  export function getPublishData (req: any, res: Response, note: any, callback: (data: any) => void) {
    const body = note.content
    const extracted = Note.extractMeta(body)
    const markdown = extracted.markdown
    const meta = Note.parseMeta(extracted.meta)
    const createtime = note.createdAt
    const updatetime = note.lastchangeAt
    let title = Note.decodeTitle(note.title)
    title = Note.generateWebTitle(meta.title || title)
    const ogdata = Note.parseOpengraph(meta, title)
    const data = {
      title: title,
      description: meta.description || (markdown ? Note.generateDescription(markdown) : null),
      viewcount: note.viewcount,
      createtime: createtime,
      updatetime: updatetime,
      body: markdown,
      theme: meta.slideOptions && isRevealTheme(meta.slideOptions.theme),
      meta: JSON.stringify(extracted.meta),
      owner: note.owner ? note.owner.id : null,
      ownerprofile: note.owner ? User.getProfile(note.owner) : null,
      lastchangeuser: note.lastchangeuser ? note.lastchangeuser.id : null,
      lastchangeuserprofile: note.lastchangeuser ? User.getProfile(note.lastchangeuser) : null,
      robots: meta.robots || false, // default allow robots
      GA: meta.GA,
      disqus: meta.disqus,
      cspNonce: res.locals.nonce,
      dnt: req.headers.dnt,
      opengraph: ogdata
    }
    callback(data)
  }

  function isRevealTheme (theme: string) {
    if (fs.existsSync(path.join(__dirname, '..', '..', '..', 'public', 'build', 'reveal.js', 'css', 'theme', theme + '.css'))) {
      return theme
    }
    return undefined
  }
}