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import { uuid, addSeconds, randomInt } from '../utils.js';
import { getRandomReferrer } from '../distributions/referrers.js';
import type { SessionData } from './sessions.js';
export const EVENT_TYPE = {
pageView: 1,
customEvent: 2,
} as const;
export interface PageConfig {
path: string;
title: string;
weight: number;
avgTimeOnPage: number;
}
export interface CustomEventConfig {
name: string;
weight: number;
pages?: string[];
data?: Record<string, string[] | number[]>;
}
export interface JourneyConfig {
pages: string[];
weight: number;
}
export interface EventData {
id: string;
websiteId: string;
sessionId: string;
visitId: string;
eventType: number;
urlPath: string;
urlQuery: string | null;
pageTitle: string | null;
hostname: string;
referrerDomain: string | null;
referrerPath: string | null;
utmSource: string | null;
utmMedium: string | null;
utmCampaign: string | null;
utmContent: string | null;
utmTerm: string | null;
gclid: string | null;
fbclid: string | null;
eventName: string | null;
tag: string | null;
createdAt: Date;
}
export interface EventDataEntry {
id: string;
websiteId: string;
websiteEventId: string;
dataKey: string;
stringValue: string | null;
numberValue: number | null;
dateValue: Date | null;
dataType: number;
createdAt: Date;
}
export interface SiteConfig {
hostname: string;
pages: PageConfig[];
journeys: JourneyConfig[];
customEvents: CustomEventConfig[];
}
function getPageTitle(pages: PageConfig[], path: string): string | null {
const page = pages.find(p => p.path === path);
return page?.title ?? null;
}
function getPageTimeOnPage(pages: PageConfig[], path: string): number {
const page = pages.find(p => p.path === path);
return page?.avgTimeOnPage ?? 30;
}
export function generateEventsForSession(
session: SessionData,
siteConfig: SiteConfig,
journey: string[],
): { events: EventData[]; eventDataEntries: EventDataEntry[] } {
const events: EventData[] = [];
const eventDataEntries: EventDataEntry[] = [];
const visitId = uuid();
let currentTime = session.createdAt;
const referrer = getRandomReferrer();
for (let i = 0; i < journey.length; i++) {
const pagePath = journey[i];
const isFirstPage = i === 0;
const eventId = uuid();
const pageTitle = getPageTitle(siteConfig.pages, pagePath);
events.push({
id: eventId,
websiteId: session.websiteId,
sessionId: session.id,
visitId,
eventType: EVENT_TYPE.pageView,
urlPath: pagePath,
urlQuery: null,
pageTitle,
hostname: siteConfig.hostname,
referrerDomain: isFirstPage ? referrer.domain : null,
referrerPath: isFirstPage ? referrer.path : null,
utmSource: isFirstPage ? referrer.utmSource : null,
utmMedium: isFirstPage ? referrer.utmMedium : null,
utmCampaign: isFirstPage ? referrer.utmCampaign : null,
utmContent: isFirstPage ? referrer.utmContent : null,
utmTerm: isFirstPage ? referrer.utmTerm : null,
gclid: isFirstPage ? referrer.gclid : null,
fbclid: isFirstPage ? referrer.fbclid : null,
eventName: null,
tag: null,
createdAt: currentTime,
});
// Check for custom events on this page
for (const customEvent of siteConfig.customEvents) {
// Check if this event can occur on this page
if (customEvent.pages && !customEvent.pages.includes(pagePath)) {
continue;
}
// Random chance based on weight
if (Math.random() < customEvent.weight) {
currentTime = addSeconds(currentTime, randomInt(2, 15));
const customEventId = uuid();
events.push({
id: customEventId,
websiteId: session.websiteId,
sessionId: session.id,
visitId,
eventType: EVENT_TYPE.customEvent,
urlPath: pagePath,
urlQuery: null,
pageTitle,
hostname: siteConfig.hostname,
referrerDomain: null,
referrerPath: null,
utmSource: null,
utmMedium: null,
utmCampaign: null,
utmContent: null,
utmTerm: null,
gclid: null,
fbclid: null,
eventName: customEvent.name,
tag: null,
createdAt: currentTime,
});
// Generate event data if configured
if (customEvent.data) {
for (const [key, values] of Object.entries(customEvent.data)) {
const value = values[Math.floor(Math.random() * values.length)];
const isNumber = typeof value === 'number';
eventDataEntries.push({
id: uuid(),
websiteId: session.websiteId,
websiteEventId: customEventId,
dataKey: key,
stringValue: isNumber ? null : String(value),
numberValue: isNumber ? value : null,
dateValue: null,
dataType: isNumber ? 2 : 1, // 1 = string, 2 = number
createdAt: currentTime,
});
}
}
}
}
// Time spent on page before navigating
const timeOnPage = getPageTimeOnPage(siteConfig.pages, pagePath);
const variance = Math.floor(timeOnPage * 0.5);
const actualTime = timeOnPage + randomInt(-variance, variance);
currentTime = addSeconds(currentTime, Math.max(5, actualTime));
}
return { events, eventDataEntries };
}
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