index.js

//This lets me know when I'm using bad programming practices
//So I can correct them
'use strict'

//Libraries I will be using
const Koa = require('koa')
const Router = require('koa-router')
const views = require('koa-views')
const staticDir = require('koa-static')
const bodyParser = require('koa-bodyparser')
const koaBody = require('koa-body')({multipart: true, uploadDir: '.'})
const session = require('koa-session')

//Modules with my functions
const Story = require('./modules/story')
const Ranking = require('./modules/ranking')

const app = new Koa()
const router = new Router()

//Setting up my libraries
app.keys = ['BBCNews']
app.use(staticDir('css'))
app.use(bodyParser())
app.use(session(app))
app.use(views(`${__dirname}/html`, { extension: 'handlebars' }, {map: { handlebars: 'handlebars' }}))

const port = 8080
const database = 'ratings.db'

//Renders Home page
router.get('/', async ctx => {
	try {
		await ctx.render('main')
	} catch(err) {
		console.error(err.message)
		await ctx.render('error', {message: err.message})
	}
})

//Renders all the articles with their JSON data
//:storyNumber becomes a variable that I use to decide which JSON data to retrieve, and which page to send the user to next with the 'next' button
router.get('/story/:storyNumber', async ctx => {
    try {
        const story = await new Story("https://github.coventry.ac.uk/raw/sarkarj/BBC-Data-Copy/master/article-" + ctx.params.storyNumber + ".json", ctx.params.storyNumber)
        const data = await story.giveData()
        const formatted = await story.formatData(data)
        const JSONtitle = formatted[0]
        const JSONheader = formatted[1]
        const JSONbody = formatted[2]
        const nextPage = Number(ctx.params.storyNumber) + 1
        await ctx.render('article', {body: JSONbody, title: JSONtitle, heading: JSONheader, nextpage: nextPage})
    } catch(err) {
        //The error below is the error returned when I try to render a page with JSONdata that doesn't exist
        //This allows the program to work with any number of JSON files, as it will only send the user to the
        //ranking page once all files from the repo have been read, and it fails to load another one.
        if(err.message == 'Unexpected token : in JSON at position 3') await ctx.redirect('/ranking/'+ctx.params.storyNumber)
        else await ctx.render('error', {message: err.message})
    }
})

//Renders the ranking page
router.get('/ranking/:nOfStories', async ctx => {
    try {
        const ranking = await new Ranking(database)
        const sList = await ranking.getNOfStories(ctx.params.nOfStories)
        const NaNcheck = Number(ctx.params.nOfStories)
        if(isNaN(NaNcheck)) throw new Error('Story index should be number')
        await ctx.render('rank', sList)
    } catch(err) {
        await ctx.render('error', {message: err.message})
    }
})

//Called by the ranking page to submit the user's choices to an sql database
router.post('/ranking', koaBody, async ctx => {
    try {
        //rankBody requests the data (as an object) from the dropdown boxes in the ranking page.
        const rankBody = ctx.request.body
        //ranks gets the raw values of the object
        const ranks = Object.values(rankBody)
        const ranking = await new Ranking(database)
        //sends rank to database
        await ranking.rank(ranks)
        //checks rank is recieved by database and logs to terminal
        const confirmation = await ranking.getLastRanking()
        console.log(confirmation)
        await ctx.redirect('./')
    } catch(err) {
        await ctx.render('error', {message: err.message})
    }
})

//Starts the program with the above routes
app.use(router.routes())
module.exports = app.listen(port, async() => console.log(`listening on port ${port}`))