import fetch from 'isomorphic-unfetch'; 
import parseSort from './parseSort'; 
import getUrl from './getUrl'; 
import getJwt from './getJwt'; 

export const $limit = 12; // number of docs per page 
export const select = ['id', 'name', 'updated', 'dir']
  .map((f, i) => ({ [`$select[${i}]`]: f })); 

export const getDocs = async (q, jwt) => {
  const docsRes = await fetch(getUrl('docs', Boolean(jwt)) + q, {
    headers: { Authorization: jwt || getJwt() }
  }).catch(({ message }) => ({ ok: false, error: message })); 
  if(docsRes.ok) {
    const res = await docsRes.json(); 
    const total = res.total || 0; 
    const docs = res.data || []; 
    return { docs, total };
  }
  return { total: 0, docs: [], error: docsRes.message }; 
};

export const buildQ = q => {
  if(!q.$search) delete q.$search; 
  if(!q.$skip) delete q.$skip; 
  else {
    q.$skip = (q.$skip - 1) * $limit; 
  }
  const $sort = parseSort(q.$sort ? q.$sort : 'updated:-1'); 
  delete q.$sort; 
  select.forEach(sel => q = {...q, ...sel}); 
  q = { $limit, ...q };
  let url = Object.keys(q).map(k => `${k}=${encodeURIComponent(q[k])}`).join('&');  
  url = `?${url}&${$sort}`; 
  return url; 
};