import Project from './model'
import mongoose from 'mongoose'
import express from 'express'

export function getHandler (req, res) {
  /** GET handler (request one or more projects) */
  let [ id ] = req.params

  /** check whether an id was specified. */
  if (typeof id !== 'undefined') {
    try {
      id = mongoose.Types.ObjectId(id.substring(1))
    } catch (err) {
      res.status(422)
      res.send(err)
      return
    }
    /** if yes, return the one project */
    Project.findOne({ _id: id }, function (err, project) {
      if (err) {
        res.status(404)
        res.send(err)
        return
      }
      res.json(project)
    })
  } else {
    /** if not, return all projects */
    const { limit, offset } = req.query
    Project.find({}, {
      limit: Math.min(Math.max(parseInt(limit) || 20, 1), 100),
      skip: Math.max(parseInt(offset) || 0, 0)
    }, function (err, projects) {
      if (err) {
        res.status(404)
        res.send(err)
        return
      }
      res.json(projects)
    })
  }
}

export function postHandler (req, res) {
  /** POST handler (insert new projects into database) */
  const project = new Project(req.body)

  project.save(function (err) {
    if (err) {
      res.status(422)
      res.send(err)
      return
    }
    res.send()
  })
}

export function putHandler (req, res) {
  /** PUT handler (update existing project) */
  const id = mongoose.Types.ObjectId(req.params['0'].substring(1))

  Project.findOne({ _id: id }, function (err, project) {
    if (err) {
      res.status(404)
      res.send(err)
    }

    for (let prop in req.body) {
      project[prop] = req.body[prop]
    }

    project.save(function (err) {
      if (err) {
        res.status(422)
        res.send(err)
      }
      res.send()
    })
  })
}

export function deleteHandler (req, res) {
  /** DELETE handler (delete project) */
  const id = mongoose.Types.ObjectId(req.params['0'].substring(1))

  Project.remove({ _id: id }, function (err, project) {
    if (err) {
      res.send(err)
    }
    res.send()
  })
}

const router = express.Router()
router.get(/\/(\w+)?\/?$/, getHandler)
router.post('/', postHandler)
router.put(/\/(\w+)?\/?$/, putHandler)
router.delete('/', deleteHandler)

export default router