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var GeoJSON = require('geojson'),
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extent = require('geojson-extent'),
outputGenerator = require('./outputGenerator');
// Properties to be copied when details=true
var DETAILS_PROPS = [
'alpha3',
'admin0',
'admin1',
'admin1_abbr',
'admin2',
'local_admin',
'locality',
'neighborhood',
'category',
'address'
];
function search( docs, params ){
var details = params ? params.details : {};
details = details === true || details === 1;
// flatten & expand data for geojson conversion
var geodata = docs.map( function( doc ) {
// something went very wrong
if( !doc || !doc.hasOwnProperty( 'center_point' ) ) {
return warning();
}
var output = {};
// provide metadata to consumer
output.id = doc._id;
output.layer = doc._type;
// map center_point
output.lat = parseFloat( doc.center_point.lat );
output.lng = parseFloat( doc.center_point.lon );
if (details) {
// map name
if( !doc.name || !doc.name.default ) { return warning(); }
output.name = doc.name.default;
copyProperties( doc, DETAILS_PROPS, output );
}
// generate region-specific text string
output.text = outputGenerator( doc );
return output;
// filter-out invalid entries
}).filter( function( doc ){
return doc;
});
// convert to geojson
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var geojson = GeoJSON.parse( geodata, { Point: ['lat', 'lng'] });
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// bounding box calculations
// @note: extent() sometimes throws Errors for unusual data
// eg: https://github.com/pelias/pelias/issues/84
try {
var bbox = extent( geojson );
if( !!bbox ){
geojson.bbox = bbox;
}
} catch( e ){
console.error( 'bbox error', e.message, e.stack );
console.error( 'geojson', JSON.stringify( geojson, null, 2 ) );
}
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return geojson;
}
/**
* Copy specified properties from source to dest.
* Ignore missing properties.
*
* @param {object} source
* @param {[]} props
* @param {object} dest
*/
function copyProperties( source, props, dest ) {
props.forEach( function ( prop ) {
if ( source.hasOwnProperty( prop ) ) {
dest[prop] = source[prop];
}
});
}
/**
* emit a warning if the doc format is invalid
*
* @note: if you see this error, fix it ASAP!
*/
function warning( doc ) {
console.error( 'error: invalid doc', __filename, doc );
return false; // remove offending doc from results
}
module.exports.search = search;