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reloadDatabase.mjs
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reloadDatabase.mjs
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import Chance from 'chance';
import fs from 'fs';
// Config values
const dbFileName = "./database.json";
const imageServer = `http://localhost:3008`;
const startingUserId = 1077;
const howManyUsers = 100;
const howManyMenuItems = 20;
const startingOrderId = 20123;
const howManyOldOrders = 200;
const howManyNewOrders = 20;
const startingReservationId = 8573;
const daysToSchedule = 10;
const oneDayInMS = 24 * 60 * 60 * 1000;
const todayInMS = (new Date()).getTime();
const yesterdayInMS = todayInMS - oneDayInMS;
// Utility functions
String.prototype.toTitleCase = function () { return this.charAt(0).toLocaleUpperCase() + this.substring(1) };
const loadFromJSON = (filename) => JSON.parse(fs.readFileSync(filename));
// Setup
const chance = Chance.Chance();
const foodImageFiles = fs.readdirSync('./public/images/food');
const initialMenuItems = loadFromJSON('./initial_data/menuItems.json');
const initialUsers = loadFromJSON('./initial_data/users.json');
const initialOrders = loadFromJSON('./initial_data/orders.json');
const categories = loadFromJSON('./initial_data/categories.json');
const films = loadFromJSON('./initial_data/films.json');
const theaters = loadFromJSON('./initial_data/theaters.json');
const db = {};
// Create some users
db.users = [];
db.users.push(...initialUsers);
for (let i = startingUserId; i <= startingUserId + howManyUsers; i++) {
db.users.push(makeRandomUser(i))
}
// Load categories
db.categories = categories;
// Create menu items
db.menuItems = []
db.menuItems.push(...initialMenuItems);
for (let i = db.menuItems.length + 1; i <= howManyMenuItems; i++) {
db.menuItems.push(makeMenuItem(i));
}
// Create orders
db.orders = [];
db.orders.push(...initialOrders);
for (let order of db.orders) {
if (order.status !== "completed") {
order.orderTime = ((new Date()) - Math.floor(Math.random() * 30 * 60 * 1000)); // Random time in the last 30 minutes
}
}
for (let i = startingOrderId; i < startingOrderId + howManyOldOrders; i++) {
db.orders.push(makeOldOrder(i));
}
for (let i = startingOrderId + howManyOldOrders; i < startingOrderId + howManyOldOrders + howManyNewOrders; i++) {
db.orders.push(makeNewOrder(i));
}
// Create films
db.films = makeFilms(films);
// Create theaters
db.theaters = theaters;
// Create tables and add them to theaters
db.theaters = addTablesToTheaters(db.theaters);
// Create seats
db.theaters = addSeatsToTheaters(db.theaters);
// Create showings
db.showings = makeShowings(db.films, db.theaters);
// Create reservations
db.reservations = makeReservations(db.users, db.theaters, db.showings)
// save database file
fs.writeFileSync(dbFileName, JSON.stringify(db, null, 2))
//////////////////////////////////////////////////////////////
// Functions
//////////////////////////////////////////////////////////////
function makeOrder(id, type) {
// get a random user,
const user = db.users[Math.floor(Math.random() * db.users.length)];
// pick a random number between 1 and 6 for the number of items on the order,
const numberOfMenuItemsOrdered = Math.floor(Math.random() * 6) + 1;
const items = [];
for (let i = 1; i <= numberOfMenuItemsOrdered; i++) {
const menuItem = db.menuItems[Math.floor(Math.random() * db.menuItems.length)];
const item = {
id: i,
itemId: menuItem.id,
price: menuItem.price,
notes: Math.random() > .67 ? chance.sentence() : undefined, // Only occasionally have a note
firstName: chance.first(),
};
items.push(item);
}
const subTotal = items.reduce((prevTotal, currItem) => prevTotal + +currItem.price, 0);
let orderTime;
if (type === "old") {
orderTime = ((new Date()) - Math.floor(Math.random() * 6 * 30 * 24 * 60 * 60 * 1000)); // Random time in the last 6 months
} else {
orderTime = ((new Date()) - Math.floor(Math.random() * 30 * 60 * 1000)); // Random time in the last 30 minutes
}
let order = {
id,
userId: user.id,
orderTime: new Date(orderTime),
pickupTime: new Date(orderTime + Math.floor(Math.random() * 15 * 60 * 1000)), // Randomly up to 15 minutes after order time
area: `Theater ${Math.floor(Math.random() * 6) + 1}`, // Random theater number between 1 and 6
location: `Table ${Math.floor(Math.random() * 50) + 1}`, // Random table number between 1 and 50
tax: +(subTotal * 0.0825).toFixed(2), // 8.25% tax
tip: +(subTotal * 0.20).toFixed(2), // 20% tip
creditCard: { ...user.creditCard, cvv: Math.floor(Math.random() * 900) + 100 }, // Random number between 100&999
items,
status: "completed",
}
// New orders aren't picked up yet.
if (type === "new")
order = { ...order, pickupTime: undefined, status: "new" };
return order;
}
function makeOldOrder(id) {
return makeOrder(id, "old");
}
function makeNewOrder(id) {
return makeOrder(id, "new");
}
function makeMenuItem(id) {
const menuItem = {
id,
name: `${chance.word().toTitleCase()} ${chance.word().toTitleCase()}`,
description: chance.paragraph({ sentences: Math.floor(Math.random() * 3) }),
category: categories[Math.floor(Math.random() * categories.length)],
price: +(Math.random() * 12 + 3).toFixed(2),
imageUrl: `${imageServer}/images/food/${foodImageFiles[Math.floor(Math.random() * foodImageFiles.length)]}`,
available: true,
}
return menuItem;
}
function makeRandomUser(id = 0) {
const gender = chance.gender().toLowerCase();
const first = chance.first({ gender });
const last = chance.last();
const biggestImageNumber = 110;
const randomImageNumber = Math.floor(Math.random() * biggestImageNumber);
const ccType = chance.cc_type();
const expiryMonth = Math.floor(Math.random() * 12) + 1;
const expiryYear = new Date().getFullYear() + Math.floor(Math.random() * 5) + 1;
const card = { PAN: chance.cc({ type: ccType }), expiryMonth, expiryYear };
const person = {
id,
username: `${first.charAt(0).toLowerCase()
}.${last.toLowerCase()}`,
password: "pass",
first,
last,
phone: chance.phone(),
email: `${first.toLowerCase()}.${last.toLowerCase()}@example.com`,
imageUrl: `https://minimaltoolkit.com/images/randomdata/${gender}/${randomImageNumber}.jpg`,
creditCard: card,
adminUser: false,
}
return person;
}
function makeFilms(films) {
return films.map(f => ({ ...f, runtime: getRandomRuntimeBetween(90, 150), release_date: getRecentDate(20) }));
}
function addTablesToTheaters(theaters) {
let id = 1; let rows = 3; let columns = 5;
for (let theater of theaters) {
theater.tables = [];
let table_number = 1;
for (let x = 1; x <= rows; x++) {
for (let y = 1; y <= columns; y++) {
const table = { id: id++, table_number, row: x, column: y };
theater.tables.push(table)
table_number++;
}
}
}
return theaters;
}
function addSeatsToTheaters(theaters) {
// Each table will have 1, 2, or 4 seats.
// Loop through each table and pick one of those numbers
const numbersOfSeatsArray = [1, 2, 4];
let id = 1;
for (let theater of theaters) {
for (let table of theater.tables) {
table.seats = [];
const numberOfSeatsAtThisTable = numbersOfSeatsArray[Math.floor(Math.random() * numbersOfSeatsArray.length)];
for (let seat_number = 1; seat_number <= numberOfSeatsAtThisTable; seat_number++) {
const seat = { id, table_id: table._id, seat_number, price: 10.75 };
table.seats.push(seat); // Add this seat to the table.
id++;
}
}
}
return theaters
}
function makeShowings(films, theaters) {
// Need to have films created and theaters created when this runs: it loops through both of those,
// creating multiple showings of a film in each theater.
const showings = [];
let showingId = 1;
for (let [index, film] of films.entries()) {
// If there's no theater, skip this film. This will happen if we have more films than theaters
if (!theaters[index]) continue;
const theater_id = theaters[index].id
// Create a daily schedule for the next X days
const lastDayInMS = todayInMS + daysToSchedule * oneDayInMS;
for (let day = yesterdayInMS; day <= lastDayInMS; day += oneDayInMS) {
const theDay = new Date(day).setHours(0, 0, 0, 0);
const midnightLocalTime = new Date(day).setHours(23, 59);
//console.log(`Showing Times:`, film.id, randomStartTime, midnightLocalTime)
for (let showing_time = getRandomStartTime(theDay, 11, 14); showing_time < midnightLocalTime; showing_time = getNextStartingTime(showing_time, film.runtime)) {
const showing = { id: showingId++, film_id: film.id, theater_id, showing_time };
showings.push(showing);
}
}
}
return showings;
}
function makeReservations(users, theaters, showings) {
const reservations = [];
let id = startingReservationId;
// Loop through each seat for each showing.
for (let showing of showings) {
// Today's shows should be about 80% filled. Tomorrow's 70%, next day 60%, etc.
const numOfDaysUntilShowing = (showing.showing_time - todayInMS) / oneDayInMS;
const percentFull = (8 - numOfDaysUntilShowing) * 0.1;
const theater = theaters.find(t => t.id === showing.theater_id);
for (let table of theater.tables) {
for (let seat of table.seats) {
const reserved = (Math.random() + percentFull) > 1;
if (reserved) {
// Get a random, but real user
const user = users[Math.floor(Math.random() * users.length)]
const payment_key = getRandomPaymentKey();
const reservation = { id, showing_id: showing.id, seat_id: seat.id, user_id: user.id, payment_key, };
reservations.push(reservation);
id++;
}
}
}
}
return reservations;
}
//////////////////////////////////////////////////////////////
// Utility/Support functions
//////////////////////////////////////////////////////////////
function getRandomPaymentKey() {
return `pk_${Math.random().toString().slice(2, 12)}`;
}
function getRandomRuntimeBetween(min, max) {
return Math.floor(Math.random() * (max - min) + min);
}
function getRecentDate(withinDays) {
const milliseconds = (Math.random() * withinDays) * 24 * 60 * 60 * 1000;
const recentDate = Date.now() - milliseconds;
return new Date(recentDate);
}
// Returns a *UTC* time between the *local* hours passed in.
function getRandomStartTime(date, earliestHour, latestHour) {
let newDate = new Date(date);
//const tzOffsetInMS = newDate.getTimezoneOffset() * 60 * 1000;
const tzOffsetInMS = 0;
const minutes = [0, 15, 30, 45];
const randomHour = Math.floor(Math.random() * (latestHour - earliestHour) + earliestHour);
const randomMinutes = minutes[Math.floor(Math.random() * minutes.length)];
newDate.setHours(randomHour, randomMinutes);
newDate = new Date(newDate.getTime() + tzOffsetInMS);
return newDate;
}
function getNextStartingTime(lastStartingTime, runtimeinMinutes = 90) {
const endTimeInMS = lastStartingTime.getTime() + runtimeinMinutes * 60 * 1000;
const nextStartingTime = new Date(endTimeInMS);
const minutes = nextStartingTime.getMinutes();
if (minutes < 15)
nextStartingTime.setMinutes(15, 0, 0);
else if (minutes < 30)
nextStartingTime.setMinutes(30);
else if (minutes < 45)
nextStartingTime.setMinutes(45);
else {
const hour = nextStartingTime.getHours() + 1;
nextStartingTime.setHours(hour, 0, 0, 0);
}
return nextStartingTime;
}