server.js

require('dotenv').config()
const express = require('express')
const morgan = require('morgan')
const cors = require('cors')

const Person = require('./models/person')

const app = express()

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

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

app.get('/info', (req, res, next) => {
  Person.find({})
    .then(people => {
      const entries = people.length
      const time = new Date().toString()

      res.send(`Phonebook has info for ${entries} people.<br><br>${time}`)
    })
    .catch(error => next(error))
})

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

app.get('/api/persons/:id', (req, res, next) => {
  const id = req.params.id

  Person.findById(id)
    .then(person => {
      if (!person) {
        res.status(404).end()

        return
      }

      res.json(person)
    })
    .catch(error => next(error))
})

app.delete('/api/persons/:id', (req, res, next) => {
  const id = req.params.id

  Person.findByIdAndDelete(id)
    .then(() => {
      res.status(204).end()
    })
    .catch(error => next(error))
})

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

  Person.find({ name: name })
    .then(person => {
      if (person.length > 0) {
        res.status(400).json({ error: 'name must be unique' })

        return
      }

      const newPerson = new Person({
        name,
        number,
      })

      newPerson.save()
        .then(person => {
          res.json(person)
        })
        .catch(error => next(error))
    })
    .catch(error => next(error))
})

app.put('/api/persons/:id', (req, res, next) => {
  const id = req.params.id
  const { name, number } = req.body

  if (!number) {
    res.status(400).json({ error: 'number is missing' })

    return
  }

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

const unknownEndpoint = (req, res) => {
  res.status(404).json({ error: 'unknown endpoint' })
}

const errorHandler = (error, req, res, next) => {
  console.log(error.message)

  if (error.name === 'CastError') {
    return res.status(404).send({ error: 'malformatted id' })
  }
  if (error.name === 'ValidationError') {
    return res.status(400).send({ error: error.message })
  }

  next(error)
}

app.use(unknownEndpoint)
app.use(errorHandler)

const port = process.env.PORT || 3001
app.listen(port, () => {
  console.log(`App listens on port ${port}`)
})