// Get CORPUS data from Network Rail and format the data for OwlBoard

// Network Rail Datafeed user and pass must be stored in `/srv/keys/owlboard/keys.config.js`

// FUNCTIONS
//  init()   : Exported: Uses the internal functions to return a clean CORPUS file.
//  get()    : Get the CORPUS data from Network Rail as a gzip file.
//  extract(): Extract the CORPUS JSON file from the GZIP file.
//  clean()  : Cleans the CORPUS data, removing unneccesary keys from the data.

const keys    = require('/srv/keys/owlboard/keys.configs');
const axios   = require('axios');
const zlib    = require('zlib');

async function initCorpus() {
    let gzipData = await getCorpusAgain();
    console.log(gzipData);
}

async function getCorpus() {
    authHead = Buffer.from(`${keys.nr_user}:${keys.nr_pass}`).toString('base64');
    const url = 'https://datafeeds.networkrail.co.uk/ntrod/SupportingFileAuthenticate?type=CORPUS'
    const options = {
        method: 'get',
        timeout: 3000,
        headers: {'Authorization': `Basic ${authHead}`},
        responseType: 'arraybuffer'
    };
    return await axios.get(url, options).then(function (response){console.log(response.data);return response.data;});
}

async function getCorpusAgain() {
    authHead = Buffer.from(`${keys.nr_user}:${keys.nr_pass}`).toString('base64');
    const decomp = zlib.createGunzip();
    const getReq = axios.create({
        method: 'get',
        baseURL: 'https://datafeeds.networkrail.co.uk/ntrod/SupportingFileAuthenticate?type=CORPUS',
        timeout: 3000,
        headers: {'Authorization': `Basic ${authHead}`},
        responseType: 'arraybuffer'
    });

    let download = await getReq().then(function (response){
        return response.data;
    })

    zlib.gunzip(download, function (_err, output){
        let string = output.toString()
        let obj = JSON.parse(string)
        //console.log(obj);
        return obj; // Find out how to get data out of callback -> See pinned tab on laptop2.ws
    })
}

async function init() { // PSUEDOCODE
    var zipData = await get();
    var rawData = extract(zipData);
    var cleanData = clean(rawData)
}

async function get() {

}

async function extract() {

}

async function clean() {

}

module.exports = {
    initCorpus,
    getCorpusAgain,
    getCorpus,
    init
}