import $ from 'cafy';
import define from '../../define';
import { Hashtags } from '@/models/index';

export const meta = {
	tags: ['hashtags'],

	requireCredential: false as const,

	params: {
		limit: {
			validator: $.optional.num.range(1, 100),
			default: 10,
		},

		query: {
			validator: $.str,
		},

		offset: {
			validator: $.optional.num.min(0),
			default: 0,
		}
	},

	res: {
		type: 'array' as const,
		optional: false as const, nullable: false as const,
		items: {
			type: 'string' as const,
			optional: false as const, nullable: false as const,
		}
	},
};

export default define(meta, async (ps) => {
	const hashtags = await Hashtags.createQueryBuilder('tag')
		.where('tag.name like :q', { q: ps.query.toLowerCase() + '%' })
		.orderBy('tag.count', 'DESC')
		.groupBy('tag.id')
		.take(ps.limit!)
		.skip(ps.offset)
		.getMany();

	return hashtags.map(tag => tag.name);
});
