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index.js
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index.js
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//PACKAGES
var express = require('express')
var bodyParser = require('body-parser')
var fs = require('fs')
var uuid = require('node-uuid')
//VARIABLES
var path = process.argv[1].split('index.js')[0]
var json = {}
var load = function() {
json = JSON.parse(fs.readFileSync(path + 'data.json'))
calculate()
}
var save = function() {
calculate()
fs.writeFileSync(path + 'data.json',JSON.stringify(json))
}
//CLASSES
var Charge = function(date, amount, reason, rate) {
this.id = uuid.v1()
this.reason = reason
this.date = date
this.amount = amount
this.rate = rate
this.log = new Date(Date.now()).toString()
json.charges.push(this)
save()
}
var Payment = function(date, amount) {
this.id = uuid.v1()
this.date = date
this.amount = amount
this.log = new Date(Date.now()).toString()
json.payments.push(this)
save()
}
var Rate = function(date, rate) {
this.id = uuid.v1()
this.date = date
this.rate = rate
this.log = new Date(Date.now()).toString()
json.rates.push(this)
save()
}
//CALCULTIONS
var calculate = function(){
var interest_charges = []
var changes = [].concat(json.charges,json.payments)
dateSort(changes)
var pc = processChanges(changes, json.rates)
var total = pc.total
var interest_charges = pc.interest_charges
var changes = pc.changes
var now = new Date(Date.now())
var completion_date = new Date(2018,8,25)
var last_date = new Date( interest_charges[ interest_charges.length - 1 ].date )
var current_total = total + calcTotalInterest( last_date, now, total )
var y = now.getYear() + 1900
var m = now.getMonth()
var d = now.getDate()
if ( d > 25 ) {
if ( m == 11) {
m = 0; y++
} else {
m++
}
}
var next_date = new Date(y,m,25)
total += calcTotalInterest( last_date, next_date, total )
var next_amount = calcPayment(next_date, last_date, completion_date, total)
var n = ((completion_date.getMonth()-next_date.getMonth())+((completion_date.getYear()-next_date.getYear())*12))+1
var abs_total = ( next_amount * n )
var total_interest = ( abs_total - current_total )
json.changes = changes
json.interest_charges = interest_charges
json.info = {
next_date: next_date.toString(),
next_amount,
abs_total,
current_total,
total_interest,
completion_date: completion_date.toString()
}
}
var processChanges = function(changes, rates) {
var total = changes[0].amount
var interest_charges = []
var payment = 0
for (var j = 1; j < changes.length; j++) {
var c1 = changes[j-1]
var c2 = changes[j]
c1.date = new Date(c1.date)
c2.date = new Date(c2.date)
var rate = getRates( rates, c1.date, c2.date )
if (rate.intermediates.length > 0) {
rate.intermediates = dateSort( rate.intermediates )
for (var i = 0; i < rate.intermediates.length; i++) {
var r = rate.intermediates[i].rate
if ( i == 0 ) {
var d1 = new Date( c1.date )
var d2 = new Date( rate.intermediates[i].date )
payment = calcInterest( r, total, d1, d2 )
interest_charges.push( { amount:payment.amount, date:d2.toString(), rate:rate.rate.rate, days:Math.round(payment.days), from:d1.toString() } )
total += payment.amount
}
if ( i == rate.intermediates.length - 1 ) {
var d1 = new Date( rate.intermediates[i].date )
var d2 = new Date( c2.date )
} else {
var d1 = new Date( rate.intermediates[i].date )
var d2 = new Date( rate.intermediates[i+1].date )
}
payment = calcInterest( r, total, d1, d2 )
interest_charges.push( { amount:payment.amount, date:d2.toString(), rate:r, days:Math.round(payment.days), from:d1.toString() } )
total += payment.amount
}
} else {
payment = calcInterest( rate.rate.rate, total, c1.date, c2.date )
total += payment.amount
interest_charges.push( { amount:payment.amount, date:c2.date.toString(), rate:rate.rate.rate, days:Math.round(payment.days), from:c1.date.toString() } )
}
if (changes[j].reason == undefined) { total -= c2.amount } else { total += c2.amount }
}
return { total, changes, interest_charges }
}
var getRates = function(rates, d1, d2) {
var rd = new Date(1971,1,1)
var res = {
rate:0,
intermediates:[]
}
for (var i = 0; i < rates.length; i++) {
var r = rates[i]
r.date = new Date(r.date)
if (r.date.getTime() <= d2.getTime()) {
if (r.date.getTime() >= d1.getTime()) {
res.intermediates.push(r)
} else if (r.date.getTime() >= rd.getTime() && r.date.getTime() <= d1.getTime()) {
rd = r.date
res.rate = r
}
}
}
return res
}
var dateSort = function(array) {
var sorted = true
var swap = function(arr,i1,i2) {
var tmp = arr[i2]
arr[i2] = arr[i1]
arr[i1] = tmp
}
var pass = function(arr) {
sorted = true;
for (var i = 1; i < arr.length; i++) {
var d1 = new Date(arr[i-1].date)
var d2 = new Date(arr[i].date)
if (d1.getTime() > d2.getTime()) { swap(arr,i-1,i); sorted = false; }
}
if (!sorted) pass(arr);
}
pass(array)
return array
}
var calcTotalInterest = function(d1, d2, total) {
var rate = getRates( dateSort(json.rates), d1, d2 )
var ti = 0
if (rate.intermediates.length > 0) {
rate.intermediates = dateSort(rate.intermediates)
for (var i = 0; i < rate.intermediates.length; i++) {
var r = rate.intermediates[i].rate
if ( i == 0 ) {
var _d1 = new Date( d1 )
var _d2 = new Date( rate.intermediates[i].date )
var t = calcInterest( r, total, _d1, _d2 ).amount
ti += t; total += t;
}
if ( i == rate.intermediates.length - 1 ) {
var _d1 = new Date( rate.intermediates[i].date )
var _d2 = new Date( d2 )
} else {
var _d1 = new Date( rate.intermediates[i].date )
var _d2 = new Date( rate.intermediates[i+1].date )
}
var t = calcInterest( r, total, _d1, _d2 ).amount
ti += t; total += t;
}
} else {
var t = calcInterest( rate.rate.rate, total, d1, d2 ).amount
ti += t; total += t;
}
return ti
}
var calcInterest = function(r, t, d1, d2) {
var d = Math.round((d2.getTime() - d1.getTime()) / ( 1000*3600*24 ))
var l = 365; if (d2.getYear() % 4 == 0) l = 366;
return { amount:Math.round( ( (d/l) * (r/100) * t ) * 100 ) / 100, days: d }
}
var calcPayment = function(next_date, last_date, completion_date, total) {
var p = total + calcTotalInterest( last_date, next_date, total )
var rate = getRates( dateSort(json.rates), next_date, completion_date )
var yr = rate.rate.rate
var max = completion_date.getTime() - next_date.getTime()
if (rate.intermediates.length > 0) {
var tr = 0
for (var i = 0; i < rate.intermediates.length; i++) {
if ( i == 0) {
var d1 = next_date
var d2 = rate.intermediates[i].date
var dr = yr
} else if ( i == rate.intermediates.length-1) {
var d1 = rate.intermediates[i].date
var d2 = completion_date
var dr = rate.intermediates[i].rate
} else {
var d1 = rate.intermediates[i-1].date
var d2 = rate.intermediates[i].date
var dr = rate.intermediates[i-1].rate
}
var diff = d2.getTime() - d1.getTime()
tr += (diff / max) * dr
}
yr = tr
}
var n = ((completion_date.getMonth()-next_date.getMonth())+((completion_date.getYear()-next_date.getYear())*12))+1
var r = ( yr/100 )/12
return p * ( (r * (Math.pow(1+r,n)) ) / ( (Math.pow(1+r,n)) - 1 ) )
}
//SERVER
var app = express()
app.use(express.static('site'))
app.use(bodyParser())
app.use(function(request,response,next) {
var obj = {}
try {
var url = request.url
var params_str = request.url.split('?')
if (params_str.length > 1) {
try {
var params = params_str[1].split('&')
for (var i = 0; i < params.length; i++) {
var param = params[i].split('=')
obj[param[0]] = param[1]
}
request.urlparams = obj
} catch (e) {
console.error(new Error(e).stack)
}
}
} catch (e) {
console.error(new Error(e).stack)
}
request.urlparams = obj
load()
next()
})
app.post('/delete*', function(request,response) {
if (request.urlparams.id == undefined || request.urlparams.tbl == undefined) {
response.status(200).send({ok:false}).end()
} else {
var id = request.urlparams.id
var tbl = request.urlparams.tbl
for (var i = json[tbl].length-1; i >= 0; i--) {
if (json[tbl][i].id == id) {
json[tbl].splice(i,1)
}
}
save()
response.status(200).send({ok:true}).end()
}
})
app.post('/payment*', function(request,response) {
var date = request.body.date
var amount = request.body.amount
new Payment(new Date(date).toString(), amount)
response.status(200).send({ok:true}).end()
})
app.post('/rate*', function(request,response) {
var date = new Date(request.body.date)
var rate = request.body.rate
new Rate(date.toString(), rate)
response.status(200).send({ok:true}).end()
})
app.post('/charge*', function(request,response) {
var date = new Date(request.body.date)
var amount = request.body.amount
var reason = request.body.reason
var rate = 0.00
var rd = new Date(1971,1,1).getTime()
for (var i = 0; i < json.rates.length; i++) {
var d = new Date(json.rates[i].date).getTime()
if (d >= rd && d <= date.getTime()) {
rate = json.rates[i].rate
rd = new Date(json.rates[i].date)
}
}
new Charge(date.toString(), amount, reason, rate)
response.status(200).send({ok:true}).end()
})
app.get('/print*', function(request,response) {
var res = dateSort([].concat(json.interest_charges, json.changes))
response.status(200).send(res).end()
})
app.get('/load*', function(request,response) {
response.status(200).send(json).end()
})
app.listen(8080)