import passport from 'passport'
import createError from 'http-errors'
import autobind from 'autobind-decorator'

@autobind
export class WorkItemRoutes {
  constructor(container) {
    const app = container.app

    this.log = container.log
    this.db = container.db
    this.mq = container.mq
    this.ws = container.ws

    app.route('/workitems')
      .get(passport.authenticate('bearer', { session: false }), this.listWorkItems)
      .post(passport.authenticate('bearer', { session: false }), this.createWorkItem)
      .put(passport.authenticate('bearer', { session: false }), this.updateWorkItem)

    app.route('/workitems/:_id([a-f0-9]{24})')
      .get(passport.authenticate('bearer', { session: false }), this.getWorkItem)
      .delete(passport.authenticate('bearer', { session: false }), this.deleteWorkItem)
  }

  listWorkItems(req, res, next) {
    const WorkItem = this.db.WorkItem
    let limit = req.params.limit || 20
    let skip = req.params.skip || 0
    let partial = !!req.params.partial
    let branch = req.params.branch
    let query = {}

    if (branch) {
      query.branch = branch
    }

    WorkItem.count({}).then((total) => {
      let workItems = []
      let cursor = WorkItem.find(query).limit(limit).skip(skip).cursor().map((doc) => {
        return doc.toClient(partial)
      })

      cursor.on('data', (doc) => {
        workItems.push(doc)
      })
      cursor.on('end', () => {
        res.json({
          total: total,
          offset: skip,
          count: workItems.length,
          items: workItems
        })
      })
      cursor.on('error', (err) => {
        next(createError.InternalServerError(err.message))
      })
    }).catch((err) => {
      next(createError.InternalServerError(err.message))
    })
  }

  createWorkItem(req, res, next) {
    const role = req.user.role

    // If user's role is not Executive or Administrator, return an error
    if (role !== 'executive' && role !== 'administrator') {
      return next(new createError.Forbidden())
    }

    // Create a new WorkItem template then assign it to a value in the req.body
    const WorkItem = this.db.WorkItem
    let workItem = new WorkItem(req.body)

    // Save the workItem (with promise) - If it doesnt, catch and throw error
    workItem.save().then((newWorkItem) => {
      res.json(newWorkItem.toClient())
    }).catch((err) => {
      next(createError.InternalServerError(err.message))
    })
  }

  updateWorkItem(req, res, next) {
    const role = req.user.role

    // If user's role is not Executive or Administrator, return an error
    if (role !== 'executive' && role !== 'administrator') {
      return new createError.Forbidden()
    }

    // Do this here because Mongoose will add it automatically otherwise
    if (!req.body._id) {
      return next(createError.BadRequest('No _id given in body'))
    }

    let WorkItem = this.db.WorkItem
    let workItemUpdates = null

    try {
      workItemUpdates = new WorkItem(req.body)
    } catch (err) {
      return next(createError.BadRequest('Invalid data'))
    }

    WorkItem.findById(workItemUpdates._id).then((foundWorkItem) => {
      if (!foundWorkItem) {
        return next(createError.NotFound(`WorkItem with _id ${_id} was not found`))
      }
      foundWorkItem.merge(workItemUpdates)
      return foundWorkItem.save()
    }).then((savedWorkItem) => {
      res.json(savedWorkItem.toClient())
    }).catch((err) => {
      next(createError.InternalServerError(err.message))
    })
  }

  getWorkItem(req, res, next) {
    const WorkItem = this.db.WorkItem
    const _id = req.params._id

    WorkItem.findById(_id).then((workItem) => {
      if (!workItem) {
        return next(createError.NotFound(`WorkItem with _id ${_id} not found`))
      }

      res.json(workItem.toClient())
    }).catch((err) => {
      next(createError.InternalServerError(err.message))
    })
  }

  deleteWorkItem(req, res, next) {
    const role = req.user.role

    // If user's role is not Executive or Administrator, return an error
    if (role !== 'executive' && role !== 'administrator') {
      return new createError.Forbidden()
    }

    const WorkItem = this.db.WorkItem
    const _id = req.params._id

    WorkItem.remove({ _id }).then((workItem) => {
      if (!workItem) {
        return next(createError.NotFound(`WorkItem with _id ${_id} not found`))
      }

      res.json({})
    }).catch((err) => {
      next(createError.InternalServerError(err.message))
    })
  }
}