index.js

//https://www.youtube.com/watch?v=pKd0Rpw7O48
//http://expressjs.com/en/4x/api.html#req
const express = require('express')
const app = express()

app.use(express.json())
//morgon loging
//express session***rare

//node js package: nodefetch***************imp0
//salesforce api endpoint and how to use them

const courses = [
    {id:1, name: 'course1'},
    {id:2, name: 'course2'},
    {id:3, name: 'course3'},
    {id:4, name: 'course4'},

]
//***********define route
//when have http get request to / apply callback fucntion
app.get('/', (req, res) => {
        res.send('HOME PAGE')
})

//get courses list
app.get('/api/courses', (req, res) => {
    //get the data from database usually
    res.send(courses)
})

//get a course with a given ID if exists
app.get('/api/courses/:id', (req, res) => {
    //get the data from database usually
    let course = courses.find( elem => elem.id === parseInt(req.params.id))//cuz return '1' not 1
    if(!course){ //ressource not found
        res.status(404).send('the course was not found')
    }
    res.send(course)
})
//create new course with POST ===> use  chrome POSTMAN to test the request
app.post('/api/courses',(req,res)=> {
    // input validation 
    if(req.body.name || req.body.length < 3){
        res.status(400).send('the name is required and must be minimum 4 characters')
        return;
    }
    //create new object
    const course = {
    id: courses.length + 1,
    name : req.body.name // must use the express.json as a midleware 
}
//push it in the courses
courses.push(course)
//by principle, show the created object in the body of the reponse to the client
res.send(course)
})

/****
 //**********route parameters
app.get('/api/posts/:year/:month/:day', (req, res) => {
    //get the data from database usually
    res.send(req.params)
})

app.get('/api/posts/:name', (req, res) => {
    //get the data from database usually
    res.send(req.params.name)
})

//********** query params 
app.get('/api/posts/:year/:month', (req, res) => {
    //get the data from database usually
    res.send(req.query)
})
 */


//port assigning 
const port = process.env.PORT || 1000
app.listen(port, ()=>{
    console.log(`im listenign on port ${port}`)
})