index.js

require('dotenv').config()
const express = require('express')
const app = express()
const bodyParser = require('body-parser')
const Person = require('./models/person')
const cors = require('cors')
app.use(express.static('build'))
app.use(bodyParser.json())
// cors is used to allow cross-origin
app.use(cors())

// morgan logging the content of request
const morgan = require('morgan')
morgan.token('content', function (req) { return JSON.stringify(req.body)})
app.use(morgan(':method :url :status :res[content-length] - :response-time ms :content'))

// handling requests to different paths
app.post('/api/persons', (req, res, next) => {
  const body = req.body

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

  person.save()
    .then(savedPerson => {
      res.json(savedPerson.toJSON())
    })
    .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.findByIdAndUpdate(req.params.id, person, { new: true })
    .then(updatedPerson => {
      res.json(updatedPerson.toJSON())
    })
    .catch(error => next(error))
})

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

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

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

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

app.use(unknownEndpoint)

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

  if (error.name === 'CastError' && error.kind === 'ObjectId') {
    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}`)
})