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var logger = require( 'pelias-logger' ).get( 'api' );
const _ = require('lodash');
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/**
example response from language web service:
{
"101748479": {
"wofid": 101748479,
"placetype": "locality",
"iso": "DE",
"area": 0.031614,
"lineage": {
"continent_id": 102191581,
"country_id": 85633111,
"county_id": 102063261,
"locality_id": 101748479,
"macrocounty_id": 404227567,
"region_id": 85682571
},
"rowid": 90425,
"names": {
"default": "München",
"eng": "Munich"
}
},
}
**/
function setup(service, should_execute) {
return function controller(req, res, next) {
if (!should_execute(req, res)) {
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return next();
}
const start = Date.now();
service(req, res, (err, translations) => {
// if there's an error, log it and bail
if (err) {
logger.error(err);
return next();
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}
logger.info('language', {
response_time: Date.now() - start,
language: req.clean.lang.iso6391,
controller: 'language', //technically middleware, but this is consistent with other log lines
});
// otherwise, update all the docs with translations
updateDocs(req, res, _.defaultTo(translations, []));
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next();
});
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};
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}
// update documents using a translation map
function updateDocs( req, res, translations ){
// this is the target language we will be translating to
var requestLanguage = req.clean.lang.iso6393;
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// iterate over response documents
res.data.forEach( function( doc, p ){
// skip invalid records
if( !doc || !doc.parent ){ return; }
// iterate over doc.parent.* attributes
for( var attr in doc.parent ){
// match only attributes ending with '_id'
var match = attr.match(/^(.*)_id$/);
if( !match ){ continue; }
// adminKey is the property name without the '_id'
// eg. for 'country_id', adminKey would be 'country'.
var adminKey = match[1];
var adminValues = doc.parent[adminKey];
// skip invalid/empty arrays
if( !Array.isArray( adminValues ) || !adminValues.length ){ continue; }
// iterate over adminValues (it's an array and can have more than one value)
for( var i in adminValues ){
// find the corresponding key from the '_id' Array
var id = doc.parent[attr][i];
if( !id ){ continue; }
// id not found in translation service response
if( !_.has(translations, id)){
logger.debug( `[language] [debug] failed to find translations for ${id}` );
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continue;
}
// requested language is not available
if (_.isEmpty(_.get(translations[id].names, requestLanguage, [] ))) {
logger.debug( `[language] [debug] missing translation ${requestLanguage} ${id}` );
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continue;
}
// translate 'parent.*' property
adminValues[i] = translations[id].names[ requestLanguage ][0];
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// if the record is an admin record we also translate
// the 'name.default' property.
if( adminKey === doc.layer ){
doc.name.default = translations[id].names[ requestLanguage ][0];
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}
}
}
});
}
// boolean function to check if changing the language is required
function isLanguageChangeRequired( req, res ){
return req && res && res.data && res.data.length &&
req.hasOwnProperty('language');
}
module.exports = setup;