'use strict';

const _ = require('lodash');
const DATUM = 'WGE';
const external = require('../service/external');


function converter( req, res, next) {
    if(_.find(req.query, (val, key) => val === 'mgrs')){
        if(req.query.from === 'mgrs' && req.query.to === 'decdeg'){
            try{
                external.geotrans(req.query.q).then(function(gtResult){
                    if(typeof gtResult === 'string' && gtResult.indexOf('ERROR') > -1){
                        res.send(gtResult);
                        throw gtResult;
                    }
                    else{
                        res.send(addQueryProperties(gtResult, req.query));
                    }
                }).catch(function(error){
                    res.send({'error':error});
                });
            }
            catch(error){
                res.send({'error': error});
            }
        }
    }
}

function addQueryProperties (geojson, query){
    geojson.properties.from = query.from;
    geojson.properties.to = query.to;
    return geojson;
}

module.exports = converter;