index.js

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

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

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

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

// let persons = [
//  {
//    "name": "Arto Hellas",
//    "number": "040-123456",
//    "id": 1
//  },
//  {
//    "name": "Ada Lovelace",
//    "number": "39-44-5323523",
//    "id": 2
//  },
//  {
//    "name": "Dan Abramov",
//    "number": "12-43-234345",
//    "id": 3
//  },
//  {
//    "name": "Mary Poppendieck",
//    "number": "39-23-6423122",
//    "id": 4
//  }
// ]

app.get('/', (req, res) => {
  res.send('<h1>Hello World!</h1>')
})

app.get('/info', (req, res, next) => {
  Person.find({})
    .then((people) => {
      res.write(`<p>Phonebook has info for ${people.length} people</p>`)
      res.write(`<p>${new Date()}</p>`)
      res.end()
    })
    .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) => {
  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(() => {
      res.status(204).end()
    })
    .catch((error) => next(error))
})

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

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

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

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

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

  Person
    .findByIdAndUpdate(req.params.id, person, {
      new: true, upsert: true, runValidators: true, context: 'query',
    })
    .then((updatedPerson) => updatedPerson.toJSON())
    .then((updatedAndFormattedPerson) => {
      res.json(updatedAndFormattedPerson)
    })
    .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' })
  }

  if (error.name === 'ValidationError') {
    return res.status(400).json({ error: error.message })
  }

  return next(error)
}

app.use(errorHandler)

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