const fetch = require("isomorphic-fetch")
const config = require("../config")
const compressQuery = require("graphql-query-compress")

/**
 * Run a GraphQL query against the rpdata backend
 * 
 * @param {string} query The query to run
 * @param {{[x:string]: any}} variables 
 * @param {{operationName:string, token: string, permissions: string[]}} options 
 */
function query(query, variables = {}, options = {}) {  
  return fetch(config.graphqlEndpoint, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Authorization": options.token ? `Bearer ${options.token}` : null,
      "X-Permissions": options.permissions ? options.permissions.join(",") : null,
    },
    body: JSON.stringify({query: query.length > 256 ? compressQuery(query || "") : query, variables, operationName: options.operationName}),
    credentials: "include",
  }).then(res => {
    if (!res.ok) {
      return Promise.reject([{
        message: `HTTP: ${res.statusText}`,
        location: null,
      }])
    }

    return res.json()
  }).then(json => {
    if (json.errors != null && json.errors.length > 0) {
      return Promise.reject(json.errors)
    }

    return json.data
  })
}

module.exports = { query }