function getUserParticipation()

in support-frontend/assets/helpers/abTests/abtest.ts [479:523]

• 35 lines of code
• 8 McCabe index (conditional complexity)

function getUserParticipation(
	test: Test,
	testId: string,
	mvtId: number,
	country: IsoCountry,
	countryGroupId: CountryGroupId,
	acquisitionDataTests: AcquisitionABTest[] | undefined,
): UserParticipation {
	const { audiences, referrerControlled } = test;

	if (cookie.get('_post_deploy_user')) {
		return NO_PARTICIPATION;
	}

	const audience =
		audiences[country] ??
		audiences[countryGroupId] ??
		audiences.ALL ??
		audiences.CONTRIBUTIONS_ONLY;

	if (!audience) {
		return NO_PARTICIPATION;
	}

	if (referrerControlled) {
		// For referrer controlled tests we have to search through the tests in the acquisition
		// data to find a match. We use the `startsWith` method to support test campaigns all
		// with a common prefix.
		const acquisitionDataTest = acquisitionDataTests?.find(
			(acquisitionDataTest) => acquisitionDataTest.name.startsWith(testId),
		);

		if (!acquisitionDataTest) {
			return NO_PARTICIPATION;
		}

		return referrerControlledActiveParticipation(acquisitionDataTest);
	}

	const testMin: number = MVT_MAX * audience.offset;
	const testMax: number = testMin + MVT_MAX * audience.size;
	return mvtId >= testMin && mvtId < testMax && userInBreakpoint(audience)
		? PARTICIPATING
		: NO_PARTICIPATION;
}