index.js

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

morgan.token('body', function (req) { return JSON.stringify(req.body) })

app.use(express.static('build'))
app.use(express.json())
app.use(morgan(':method :url :status :res[content-length] - :response-time ms :body'))

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

app.get('/api/persons/:id', (req, res, next) => {
  Person.findById(req.params.id)
    .then(person => {
      if (person) {
        res.json(person.toJSON())
      } else {
        res.status(404).end()
      }
    })
    .catch(error => next(error))
})

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

  const person = {
    name: body.name,
    number: body.number,
  }

  Person.findOneAndUpdate({ _id: req.params.id }, person, { new: true, runValidators: true, context: 'query' })
    .then(updatedPerson => {
      if (updatedPerson) {
        res.json(updatedPerson.toJSON())
      } else {
        res.status(404).end()
      }
    })
    .catch(error => next(error))
})

app.delete('/api/persons/:id', (req, res, next) => {
  Person.findByIdAndRemove(req.params.id)
    .then(() => {
      res.status(204).end()
    })
    .catch(error => next(error))
})

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

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

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

  const person = new Person({
    name: body.name,
    number: body.number
  })

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

app.get('/info', (req, res) => {
  Person.find({}).then(persons => {
    res.send(`Phonebook has info for ${persons.length} people<br>
        <br>
        ${new Date().toString()}
            `)
  })
})

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}`)
})