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/**
* Category type in Javascript
* @typedef {Object} Category
* @property {Number} id
* @property {string} name
*/
/**
* Expense Type needed for summary
* @typedef {Object} Expense
* @property {Category} category
* @property {Number} amount
*/
/***
* The main function
*/
async function main() {
const data = await getData()
const root = document.getElementById("root")
// Extract Labels
const labels = uniq(data.map(
({ category }) => category),
({ id }) => id
).sort((a, b) => a.id - b.id)
createGraphs(root, data, labels)
generateTable(root, data, labels)
}
/**
* Crete the Table
* @param {HTMLElement} root
* @param {Expense[]} data
* @param {str[]} labels
*/
function generateTable(root, data, labels) {
const summary = group_cat(data, labels)
const table = document.createElement("table")
table.style.margin = "1rem auto"
root.append(table)
table.createTHead()
table.createTFoot()
const row = table.tHead.insertRow()
row.append(...["Category", "Amount"].map(element => {
const header = document.createElement("th")
header.append(element)
return header
}))
summary.forEach(element => {
const row = table.insertRow()
const link = document.createElement("a")
row.insertCell().append(link)
link.href = `/cat/${element.category.id}`
link.append(element.category.name)
row.insertCell().append(element.amount.toFixed(2))
})
const footer = table.tFoot.insertRow();
[
"Overall",
summary.reduce((partialSum, { amount }) => partialSum + amount, 0).toFixed(2)
].forEach(element => {
footer.insertCell().append(element)
})
}
/**
* Create The Pie Charts
* @param {HTMLElement} root
* @param {Expense[]} data
* @param {str[]} labels
*/
function createGraphs(root, data, labels) {
const graphBar = document.createElement("div")
root.append(graphBar)
graphBar.style.display = "grid"
graphBar.style.gridAutoFlow = "column"
pieChart(graphBar, group_cat(data.filter(({ amount }) => amount < 0), labels), "Inflow")
pieChart(graphBar, group_cat(data.filter(({ amount }) => amount > 0), labels), "Outflow")
}
/**
* Fetches the summary Data
* @returns {Promise<Expense[]>}
*/
async function getData() {
const res = await fetch("/summary.json")
const raw = await res.json()
const data = raw.map(({ amount, category }) => ({ amount, category }))
return data
}
/**
* Group the data by category
* @param {Expense[]} data
* @param {Category[]} labels
* @returns {Expense[]}
*/
function group_cat(data, labels = []) {
return data.reduce((accumulator, { category, amount }) => {
const index = accumulator.find(element => element.category.id == category.id)
if (index !== undefined) {
index.amount += amount
return accumulator
} else {
return [...accumulator, { category, amount }]
}
}, labels.map(category => ({ category, amount: 0 })))
}
/**
* Create a pie chart from the data
* @param {element} root
* @param {any[]} data
* @param {str} title
*/
function pieChart(root, data, title = "") {
const ctx = document.createElement('canvas')
new Chart(ctx, {
type: "pie",
data: {
labels: data.map(({ category }) => category.name),
datasets: [{
data: data.map(({ amount }) => amount)
}]
},
options: {
plugins: {
legend: {
position: 'right',
},
title: {
display: true,
text: title
}
}
}
})
root.append(ctx)
}
/**
* get the unique value in an array
* @param {any[]} arr
* @param {(any) => any} key
* @returns any[]
*/
function uniq(arr, key) {
var seen = new Set()
return arr.filter((item) => {
var k = key(item)
return seen.has(k) ? false : seen.add(k)
})
}
window.onload = main
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