import { GetArgs } from '@seed/graphql/Request';

const DEFAULT_LIMIT = 100;
const DEFAULT_OFFSET = 0;

export interface QueryPagination {
    limit: number;
    skip: number;
    sort?: {
        [k: string]: 1 | -1;
    };
}

export const parsePaginationOptions = (obj?: GetArgs): QueryPagination => {
    const limit = obj ? (obj.limit ? obj.limit : DEFAULT_LIMIT) : DEFAULT_LIMIT;
    const skip = obj ? (obj.skip ? obj.skip : DEFAULT_OFFSET) : DEFAULT_OFFSET;

    if (obj && obj.sort) {
        const sort = {};
        const sortArray = ('' + obj.sort).split(',');
        for (let index = 0; index < sortArray.length; index++) {
            const sortTmp = ('' + obj.sort).split(' ');
            if (sortTmp[1].toLowerCase() === 'asc') (sort as any)[sortTmp[0]] = 1;
            if (sortTmp[1].toLowerCase() === 'desc') (sort as any)[sortTmp[0]] = -1;
        }
        return { limit, skip, sort };
    }
    return { limit, skip };
};