server.js

'use strict'

const express = require('express')
const bodyParser = require('body-parser')
const compression = require('compression')
const app = express()
app.use(compression())

// disallow http headers
app.disable('x-powered-by')

// app.use(minify())
app.use(express.static('./'))


const nunjucks = require('nunjucks')
nunjucks.configure('views', {
  autoescape: true,
  express: app,
  watch: true
})


app.use(bodyParser.urlencoded({ extended: true }))


const couch = require('./lib/couch.js')
const generate = require('./lib/generators.js')
const checker = require('./lib/checker.js')
const gallery = require('./lib/gallery.js')
// const test = require('./lib/tests.js')
// const draw = require('./lib/draw.js')
// const trans = require('./lib/transformations.js')
// const cmd = require('./lib/haskell.js')
// cmd.ls()



// START THE SERVER
app.listen(3001, () => {
	console.log('Magic Squares Version 3.2.2')
	console.log('Running on http://localhost:3001')
})



async function setupSource(n) {
  const result = await generate.source(n)
  await couch.populateDBSource(result, n)
}
async function setupSuzuki(n) {
  const result = await generate.sourceSuzuki(n)
  await couch.populateDBSourceSuzuki(result, n)
}
async function initialiseSources() {
  const orders = [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,24,25,26,27,28,30,32]
  const forLoop = async _ => { 
    for (let i=0; i < orders.length; i++) {
      await setupSource(orders[i])
    } 
  }
  forLoop()
}

// initialiseSources()
// setupSource(256)
// setupSource(4)
// setupSuzuki(4)



// couch.statusReport()
// test.couchDB()




// ROUTES
app.get('/', (req, res) => { res.render('home.njk') })
app.post('/', async (req, res) => { 
  // const theme = req.body
  // if(!theme.overlap) theme.overlap = 'false'
  // await couch.insertTheme(theme)
  res.render('home.njk')
})

app.get('/research', (req, res) => { res.render('research.njk') })
app.post('/research', async (req, res) => { 
  // const theme = req.body
  // if(!theme.overlap) theme.overlap = 'false'
  // await couch.insertTheme(theme)
  res.render('research.njk')
})

app.get('/gallery', (req, res) => { 
  res.render('gallery.njk', { files: gallery.getFiles() })
})

app.get('/about', (req, res) => { res.render('about.njk') })

app.get('/contribute', (req, res) => { res.render('contribute.njk') })
app.post('/contribute', async (req, res) => {
  const result = await checker.magic( req.body.manualInput )
  // console.log(result)
  // TODO add to cache
  res.render('contribute.njk', { result: result } )
})



// DATA API

// n = [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
// s = ['arrays','arc','altarc','quadvertex','quadline','numbers','unique','straight','circles','blocks','tetromino']
// o = [0,200,400,600, etc]

// TODO add http://localhost to cors ?
// NEW - Add CORS headers - see https://enable-cors.org/server_expressjs.html
app.use( (req, res, next) => {
  res.header('Access-Control-Allow-Origin', 'https://magic.fania.eu')
  res.header('Access-Control-Allow-Headers', 
             'Origin, X-Requested-With, Content-Type, Accept, ETag')
  // res.header('Access-Control-Expose-Headers', 'ETag')
  next()
})


// order matters

// app.get('/data/:n(\\d+)/:s([a-z])/:o(\\d+)', async (req, res) => {
app.get('/data/:n/:s/:o', async (req, res) => {
  const order = req.params.n
  const style = req.params.s
  const offset = req.params.o
  // console.log(order,style,offset)
  // const data = await couch.viewDB(order, 'filters', style, offset)
  // const source = await couch.viewSourceDB(order,offset)
  const source = await couch.viewSourceDB(order,style,offset)
  const data = await generate.svgData(source,order,style)
  res.send( data )
})
app.get('/data/suzuki', async (req, res) => {
  // console.log(order,style,offset)
  const source = await couch.viewDB('suzuki','straight',0)
  const data = await generate.svgData(source,4,'straight')
  res.send( data )
})
app.get('/data/themes', async (req, res) => {
  const data = await couch.viewAllDB('themes')
  res.send( data )
})
const data = {}
app.get('/data/curated', async (req, res) => {
  // const currentCounter = await couch.viewCuratedCounterDB()
  const increaseCounter = await couch.updateCuratedCounterDB()
  data['counter'] = increaseCounter.counter
  res.send( data )
  // console.log('increaseCounter',increaseCounter.counter)
})
app.get('/data/orders', async (req, res) => {
  const data = await couch.getAllOrders()
  res.send( data )
})
app.get('/data/flags/:f', async (req, res) => {
  const filter = req.params.f
  const source = await couch.viewFilterDB(filter)
  // console.log(source[0])
  // const data = await generate.svgData(source,4,"quadvertex")
  const data = await generate.svgData(source,4,"straight")
  res.send( data )
})

// app.get('/data/lengths', async (req, res) => {
//   // const data = await couch.getAllOrders()
//   // res.send( data )
// })