"use strict";

const pickRandomWeighted = require("pick-random-weighted");
const syncpipe = require("syncpipe");

let columns = {
	color: [ "blue", "black", "brown", "red", "yellow", "gray", "white", "pink", "purple" ],
	size: [ "XS", "S", "M", "L", "XL", "XXL" ],
	country_id: [ 1, 2, 3, 4, 5 ],
	store_id: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ],
	price: [ 2, 5.50, 12, 20, 22.50 ]
};

function shuffle(arrayReference) {
	arrayReference.sort(() => Math.random() - 0.5);
}

function shuffleAllColumns() {
	for (let key of Object.keys(columns)) {
		shuffle(columns[key]);
	}
}

let printColumns = Object.keys(columns);
function printItem(item) {
	console.log(printColumns.map((column) => item[column]).join(";"));
}

console.log(printColumns.join(";"));

for (let i = 0; i < 200; i++) {
	shuffleAllColumns();

	// We do this because we *don't* want an even distribution, to make the data more realistic.
	let weightedColumns = Object.entries(columns).map(([ key, values ]) => {
		return [
			key,
			values.map((value, i) => {
				return [ value, i ];
			})
		];
	});

	for (let i = 0; i < 1000; i++) {
		let data = syncpipe(weightedColumns, [
			(_) => _.map(([ key, values ]) => {
				return [
					key,
					pickRandomWeighted(values)
				];
			}),
			(_) => Object.fromEntries(_)
		]);
		
		printItem(data);
	}
}