import type { Meta } from '@nextgenleads/dnc';
import type { Model, FindOptions, Attributes } from 'sequelize/types';

/** Parse provided model and compile pagination data & query mixin */
export function parseGRPCPagination<M extends Model>(
	options: FindOptions<Attributes<M>>,
	params: { count: number; page: number; limit: number; skip?: number }
) {
	const start = params.page * params.limit + (params.skip || 0);
	const end = start + params.limit;
	const pagination: Meta.Query_Pagination = {
		count: params.count,
		pages: Math.ceil(params.count / params.limit),
		next_page: end < params.count,
		prev_page: start > 0,
		// Page is 1-index on submission, we use as 0-index
		current_page: params.page + 1,
		limit: params.limit,
		offset: params.skip,
	};

	if (options.group) throw new Error('Unable to paginate groupings');
	const result = {
		...options,
		offset: start,
		limit: params.limit,
	};

	return { result, pagination };
}