index.js

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

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

morgan.token('data', function (request) {
  const result = JSON.stringify(request.body)
  if (result !== '{}') {
    return result
  } else {
    return ''
  }
})

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

/* 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('/api/persons', (request, response) => {
  Person
    .find({})
    .then(persons => {
      response.json(persons.map(person => person.toJSON()))
    })
})

app.get('/info', (request, response) => {
  Person
    .find({})
    .then(persons => {
      const date = new Date()
      response.send(`<p>Phonebook has info for ${persons.length} people</p><p>${date}</p>`)
    })
})

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

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

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

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

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

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

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

  Person.findByIdAndUpdate(request.params.id, person, { new: true })
    .then(updatedPerson => {
      response.json(updatedPerson.toJSON())
    })
    .catch(error => next(error))
})

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

app.use(unknownEndpoint)

const errorHandler = (error, request, response, next) => {
  console.error(error.message)

  if (error.name === 'CastError') {
    return response.status(400).send({ error: 'malformatted id' })
  } else if (error.name === 'ValidationError') {
    return response.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}`)
})