index.js

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

morgan.token('body', (request) => request.body);

const app = express();
app.use(cors());
app.use(express.static('build'));
app.use(express.json());

const assignBodyJson = (request, response, next) => {
  request.body = JSON.stringify(request.body);
  next();
};

app.use(assignBodyJson);
app.use(
  morgan(':method :url :status :res[content-length] - :response-time ms :body'),
);

app.get('/api/persons', (request, response, next) => {
  Person.find({})
    .then((result) => {
      response.json(result);
    })
    .catch((error) => next(error));
});

app.use((request, response, next) => {
  request.requestTime = Date.now();
  next();
});

app.get('/info', (request, response, next) => {
  const requestTime = new Date(request.requestTime);
  Person.countDocuments({})
    .then((result) => {
      const responseText = `<div>Phonebook has info for ${result} people</div><br><div>${requestTime}</div>`;
      response.send(responseText);
    })
    .catch((error) => next(error));
});

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

app.put('/api/persons/:id', (request, response, next) => {
  const { name, number } = JSON.parse(request.body);

  Person.findByIdAndUpdate(
    request.params.id,
    { name, number },
    { new: true, runValidators: true, context: 'query' },
  )
    .then((updatetedContact) => {
      if (!updatetedContact) {
        response.status(404).json({ error: '' });
      }
      response.json(updatetedContact);
    })
    .catch((error) => next(error));
});

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

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

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

  contact
    .save()
    .then((savedContact) => {
      response.json(savedContact);
    })
    .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' });
  } if (error.name === 'ValidationError') {
    return response.status(400).json({ error: error.message });
  } if (error.name === 'Invalid phone number') {
    return response.status(400).json({ error: error.message });
  }
  next(error);
};

app.use(errorHandler);

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