codecombat/server/middleware/patchable.coffee

utils = require '../lib/utils'
errors = require '../commons/errors'
wrap = require 'co-express'
Promise = require 'bluebird'
Patch = require '../models/Patch'
mongoose = require 'mongoose'
database = require '../commons/database'
parse = require '../commons/parse'

module.exports =
  patches: (Model, options={}) -> wrap (req, res) ->
    dbq = Patch.find()
    dbq.limit(parse.getLimitFromReq(req))
    dbq.skip(parse.getSkipFromReq(req))
    dbq.select(parse.getProjectFromReq(req))

    doc = yield database.getDocFromHandle(req, Model, {_id: 1})
    if not doc
      throw new errors.NotFound('Patchable document not found')
      
    query =
      $or: [
        {'target.original': doc.id }
        {'target.original': doc._id }
      ]
    if req.query.status
      query.status = req.query.status
    if req.user and req.query.creator is req.user.id
      query.creator = req.user._id
    
    patches = yield dbq.find(query).sort('-created')
    res.status(200).send(patches)

  joinWatchers: (Model, options={}) -> wrap (req, res) ->
    doc = yield database.getDocFromHandle(req, Model)
    if not doc
      throw new errors.NotFound('Document not found.')
    if not database.hasAccessToDocument(req, doc, 'get')
      throw new errors.Forbidden()
    updateResult = yield doc.update({ $addToSet: { watchers: req.user.get('_id') }})
    if updateResult.nModified
      watchers = doc.get('watchers')
      watchers.push(req.user.get('_id'))
      doc.set('watchers', watchers)
    res.status(200).send(doc)
    
  leaveWatchers: (Model, options={}) -> wrap (req, res) ->
    doc = yield database.getDocFromHandle(req, Model)
    if not doc
      throw new errors.NotFound('Document not found.')
    updateResult = yield doc.update({ $pull: { watchers: req.user.get('_id') }})
    if updateResult.nModified
      watchers = doc.get('watchers')
      watchers = _.filter watchers, (id) -> not id.equals(req.user._id)
      doc.set('watchers', watchers)
    res.status(200).send(doc)