index.js

const express = require('express')
const morgan = require('morgan')
const cors = require('cors')
const app = express()
const Contact = require('./models/contacts')

const PORT = process.env.PORT || 3001

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') {
    const errorMessages = Object.values(error.errors).map((err) => err.message)
    return response.status(400).json({ error: errorMessages.join(' ') }) // Custom error response
  }

  next(error)
}

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

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

app.get('/api/persons', (request, response) => {
  Contact.find({}).then((result) => {
    response.json(result)
  })
})

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

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

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

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

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

  const contact = new Contact({
    name: body.name,
    number: body.number,
  })

  contact
    .save()
    .then((savedContact) => {
      response.json(savedContact)
    })
    .catch((error) => next(error))
})

// New PUT endpoint to handle updates
app.put('/api/persons/:id', (request, response, next) => {
  const body = request.body

  if (!body.name || !body.number) {
    return response.status(400).json({
      error: 'name or number missing',
    })
  }

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

  Contact.findByIdAndUpdate(request.params.id, contact, {
    new: true,
    runValidators: true,
    context: 'query',
  })
    .then((updatedContact) => {
      if (updatedContact) {
        response.json(updatedContact)
      } else {
        response.status(404).end()
      }
    })
    .catch((error) => next(error))
})

app.get('/info', (request, response) => {
  Contact.countDocuments({}).then((count) => {
    const currentDate = new Date()
    response.send(`
        <p>Phonebook has info for ${count} people</p>
        <p>${currentDate}</p>
      `)
  })
})

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

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