index.js

const express = require('express')
const morgan = require('morgan')
const app = express()
const cors = require('cors')
require('dotenv').config()
const Person = require('./models/person.js')

app.use(express.json())
app.use(express.static('build'))
app.use(cors())

morgan.token('body', (req) => JSON.stringify(req.body))
app.use(morgan(':method :url :status :res[content-length] - :response-time ms :body'))

app.get('/', (req, res) => {
  res.send('<h1>Congrats! You\'ve reached the server.</h1>')
})

app.get('/info', (req, res, next) => {
  Person.estimatedDocumentCount()
    .then(number => res.send(`<p>Phone book has info for ${number} people</p><p>${new Date}</p>`))
    .catch(error => next(error))
})

app.get('/api/persons', (req, res) => {
  Person.find({}).then(persons =>
    res.json(persons))
})

app.post('/api/persons', (req, res, next) => {
  const body = req.body

  if (!body.name || !body.number) {
    return res.status(400).json({
      error: 'name or number is missing'
    })
  }

  console.log('adding a person..')
  const person = new Person({
    name: body.name,
    number: body.number
  })

  person.save()
    .then(savedPerson => {
      console.log('person added')
      res.json(savedPerson)
    })
    .catch(err => next(err))
})

app.put('/api/persons/:id', (req, res, next) => {
  console.log('updating a person..')
  const id = req.params.id
  const { number } = req.body

  Person.findByIdAndUpdate(
    id,
    { number: number },
    { new: true , runValidators: true, context: 'query' }
  )
    .then(updatedPerson => res.json(updatedPerson))
    .catch(err => next(err))
})

app.get('/api/persons/:id', (req, res, next) => {
  const id = req.params.id
  Person.findById(id)
    .then(person => res.json(person))
    .catch(error => next(error))
})

app.delete('/api/persons/:id', (req, res, next) => {
  Person.findByIdAndDelete( req.params.id )
    .then(result => {
      if(result) {
        res.statusMessage = 'person successfully deleted'
        res.status(204).end()
      } else {
        res.statusMessage = 'person not found'
        res.status(404).end()
      }
    })
    .catch(error => next(error))
})

const unknownEndpoint = (request, response) => {
  response.status(404).send({ error: 'unknown endpoint' })
}

app.use(unknownEndpoint)

const errorHandler = (error, req, res, next) => {
  console.error(error.message)
  if (error.name === 'CastError') {
    return res.status(400).send({ error: 'malformatted id' })
  } else if (error.name === 'ValidationError') {
    return res.status(400).json({ error: error.message })
  }
  next(error)
}

app.use(errorHandler)

const PORT = process.env.PORT
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`)
})