index.js

const express = require('express')
const app = express()
const cors = require('cors')
require('dotenv').config()
const bodyparser = require('body-parser');
const mongoose = require('mongoose');
const { Schema } = mongoose;

mongoose.connect(process.env['CONNECTION'])

const UserSchema = new Schema({
  username: String,
});

const User = mongoose.model("User", UserSchema);

const ExerciseSchema = new Schema({
  user_id: {type: String, required: true },
  description: String,
  duration: Number,
  date: Date,
});

const Exercise = mongoose.model("Exercise", ExerciseSchema);


app.use(bodyparser.urlencoded({extended:true}))
app.use(cors())
app.use(express.static('public'))
app.get('/', (req, res) => {
  res.sendFile(__dirname + '/views/index.html')
});


app.get("/api/users" , async(req,res)=> {
  const users = await User.find({}).select("_id username");

  if (!users) {
    res.send("No users");
  } else {
    res.json(users);
  }

})

app.post("/api/users", async(req, res) => {
  const userObj = new User({
    username: req.body.username
  })

  try{
    const user = await userObj.save()
    console.log(user)
    res.json(user)
  }catch (err){
    console.log(err)
  }

  });


  app.post("/api/users/:_id/exercises", async(req, res) => {
    const id = req.params._id;
    const {description, duration, date } = req.body

    try{
      const user = await User.findById(id);
      if(!user){
        res.send("Could not find user")
      }else{
        const exerciseObj = new Exercise({
          user_id: user._id,
          description,
          duration,
          date: date ? new Date(date) : new Date()
        }) 
        const exercise =  await exerciseObj.save()
        res.json({
          _id: user._id,
          username: user.username,
          description: exercise.description,
          duration: exercise.duration,
          date: new Date(exercise.date).toDateString()
        })
      }
    }catch(err) {
      console.log(err);
      res.send("There was an error saving the exercise")
    }
  })

  app.get("/api/users/:_id/logs", async (req, res) => {
    const { from, to, limit } = req.query;
    const id = req.params._id;
    const user = await User.findById(id);
    if(!user){
      res.send("Could not find user")
      return;
    }
    let dateObj = {}

    if (from) {
      dateObj["$gte"] = new Date(from)
    }
    if (to){
      dateObj["$lte"] = new Date(to)
    }

    let filter = {
      user_id: id
    }
    if (from || to){
      filter.date = dateObj;
    }

    const exercises = await Exercise.find(filter).limit(+limit ?? 500)

    const log = exercises.map(e =>({
      description: e.description,
      duration: e.duration,
      date: e.date.toDateString()
    }))

    res.json({
      username: user.username,
      count: exercises.length,
      _id: user._id,
      log
    })
  });





const listener = app.listen(process.env['PORT'] || 3000, () => {
  console.log('Your app is listening on port ' + listener.address().port)
})