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var queries = require('geopipes-elasticsearch-backend').queries,
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sort = require('../query/sort'),
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adminFields = require('../helper/adminFields').availableFields,
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addressWeights = require('../helper/address_weights');
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function generate( params ){
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var centroid = null;
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if ( params.lat && params.lon ){
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centroid = {
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lat: params.lat,
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lon: params.lon
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};
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}
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var query = queries.distance( centroid, { size: params.size } );
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var input = params.input;
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if (params.bbox) {
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query = queries.bbox ( centroid, { size: params.size, bbox: params.bbox } );
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}
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query.query.filtered.query = {
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'bool': {
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'must': [],
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'should': []
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}
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};
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if (params.parsed_input) {
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addParsedMatch(query, input, params.parsed_input);
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// update input
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if (params.parsed_input.number && params.parsed_input.street) {
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input = params.parsed_input.number + ' ' + params.parsed_input.street;
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} else if (params.parsed_input.admin_parts) {
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input = params.parsed_input.name;
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}
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}
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// add search condition to distance query
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query.query.filtered.query.bool.must.push({
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'match': {
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'name.default': input
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}
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});
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// add phrase matching query
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// note: this is required for shingle/phrase matching
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query.query.filtered.query.bool.should.push({
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'match': {
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'phrase.default': input
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}
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});
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query.sort = query.sort.concat( sort( params ) );
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return query;
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}
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function addParsedMatch(query, defaultInput, parsedInput) {
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query.query.filtered.query.bool.should = [];
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// copy expected admin fields so we can remove them as we parse the address
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var unmatchedAdminFields = adminFields.slice();
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// address
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// number, street, postalcode
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addMatch(query, unmatchedAdminFields, 'address.number', parsedInput.number, addressWeights.number);
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addMatch(query, unmatchedAdminFields, 'address.street', parsedInput.street, addressWeights.street);
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addMatch(query, unmatchedAdminFields, 'address.zip', parsedInput.postalcode, addressWeights.zip);
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// city
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// admin2, locality, local_admin, neighborhood
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addMatch(query, unmatchedAdminFields, 'admin2', parsedInput.admin2, addressWeights.admin2);
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// state
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// admin1, admin1_abbr
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addMatch(query, unmatchedAdminFields, 'admin1_abbr', parsedInput.state, addressWeights.admin1_abbr);
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// country
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// admin0, alpha3
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addMatch(query, unmatchedAdminFields, 'alpha3', parsedInput.country, addressWeights.alpha3);
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var inputRegions = parsedInput.regions ? parsedInput.regions.join(' ') : undefined;
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// if no address was identified and input suggests some admin info in it
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if (unmatchedAdminFields.length > 0 && inputRegions !== defaultInput) {
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unmatchedAdminFields.forEach(function (key) {
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if (parsedInput.admin_parts) {
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addMatch(query, [], key, parsedInput.admin_parts);
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}
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else {
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addMatch(query, [], key, inputRegions);
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}
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});
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}
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}
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function addMatch(query, unmatched, key, value, boost) { // jshint ignore:line
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if (typeof value === 'undefined') {
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return;
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}
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var match = {};
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if (boost) {
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match[key] = {
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query: value,
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boost: boost
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};
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}
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else {
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match[key] = value;
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}
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query.query.filtered.query.bool.should.push({ 'match': match });
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var index = unmatched.indexOf(key);
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if (index !== -1) {
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unmatched.splice(index, 1);
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}
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}
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module.exports = generate;
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