import knex from './knex.js';
import redis from './redis.js';
import initLogger from './logger.js';

const logger = initLogger();

function curateTag(tag, context) {
	return {
		id: tag.id,
		name: tag.name,
		slug: tag.slug,
		priority: tag.priority,
		...context.append?.[tag.id],
	};
}

export async function fetchTagsById(tagIds, options = {}) {
	const [tags] = await Promise.all([
		knex('tags')
			.whereIn('tags.id', tagIds)
			.modify((builder) => {
				if (options.order) {
					builder.orderBy(...options.order);
				}
			}),
	]);

	if (options.order) {
		return tags.map((tagEntry) => curateTag(tagEntry, { append: options.append }));
	}

	const curatedTags = tagIds.map((tagId) => {
		const tag = tags.find((tagEntry) => tagEntry.id === tagId);

		if (!tag) {
			console.warn(`Can't match tag ${tagId}`);
			return null;
		}

		return curateTag(tag, { append: options.append });
	}).filter(Boolean);

	return curatedTags;
}

export async function cacheTagIds() {
	const tags = await knex('tags')
		.select('id', 'slug')
		.whereNull('alias_for')
		.whereNotNull('slug');

	await redis.del('traxxx:tags:id_by_slug');
	await redis.hSet('traxxx:tags:id_by_slug', tags.map((tag) => [tag.slug, tag.id]));

	logger.info('Cached tags IDs by slug');
}