server.js

const express = require('express')
const app = express()
const MongoClient = require('mongodb').MongoClient
const PORT = 2121
require('dotenv').config()

let db,
    dbConnectionStr = process.env.DB_STRING,
    dbName = 'todo'

MongoClient.connect(dbConnectionStr, { useUnifiedTopology: true})
    .then(client => {
        console.log(`Connected to ${dbName} database`)
        db = client.db(dbName)
    })
    .catch(err =>
        console.error(error))

app.set('view engine', 'ejs')
app.use(express.static('public'))
app.use(express.urlencoded({ extended: true }))
app.use(express.json())


app.get('/', async (req, res) => {
const todoItems = await db.collection('todos').find().toArray()
const itemsLeft = await db.collection('todos').countDocuments(
    {completed: false})
    res.render('index.ejs', {zebra: todoItems, left: itemsLeft})
})

app.post('/createTodo', (req, res) => {
    db.collection('todos').insertOne({todo: req.body.todoItem, completed: false})
    .then(result => {
        console.log('Todo has been added')
        res.redirect('/')
    })
})  

app.put('/markComplete', (req, res) => {
    db.collection('todos').updateOne({todo: req.body.rainbowUnicorn}, {
        $set: {
            completed: true
        }
    })
    .then(result =>
        console.log('Marked Complete'),
        res.json('Marked Complete')

)})

app.put('/undoComplete', (req, res) => {
    db.collection('todos').updateOne({todo: req.body.rainbowUnicorn}, {
        $set: {
            completed: false
        }
    })
    .then(result =>
        console.log('Marked Incomplete'),
        res.json('Marked Incomplete')

)})

app.delete('/deleteTodo', (req, res) => {
    db.collection('todos').deleteOne({todo: req.body.rainbowUnicorn})
    .then(result => {
        console.log('Deleted Todo')
        res.json('Deleted it')
    })
    .catch( err => console.log(err))
})


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