const USER_ALT_PREFIX = 'Alt: ';
const DEFAULT_ALT_PREFIX = 'ALT: ';

export function createGIFDescription(tenorDescription: string, preferredAlt: string = '') {
	const alt = preferredAlt.trim();
	if (alt !== '') {
		return USER_ALT_PREFIX + alt;
	} else {
		return DEFAULT_ALT_PREFIX + tenorDescription;
	}
}

export function parseAltFromGIFDescription(description: string): {
	isPreferred: boolean;
	alt: string;
} {
	if (description.startsWith(USER_ALT_PREFIX)) {
		return {
			isPreferred: true,
			alt: description.replace(USER_ALT_PREFIX, ''),
		};
	} else if (description.startsWith(DEFAULT_ALT_PREFIX)) {
		return {
			isPreferred: false,
			alt: description.replace(DEFAULT_ALT_PREFIX, ''),
		};
	}
	return {
		isPreferred: false,
		alt: description,
	};
}