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var peliasQuery = require('pelias-query'),
defaults = require('./search_defaults'),
textParser = require('./text_parser'),
check = require('check-types'),
geolib = require('geolib');
var placeTypes = require('../helper/placeTypes');
// region_a is also an admin field. addressit tries to detect
// region_a, in which case we use a match query specifically for it.
// but address it doesn't know about all of them so it helps to search
// against this with the other admin parts as a fallback
var adminFields = placeTypes.concat(['region_a']);
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//------------------------------
// general-purpose search query
//------------------------------
var query = new peliasQuery.layout.FilteredBooleanQuery();
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// mandatory matches
query.score( peliasQuery.view.boundary_country, 'must' );
query.score( peliasQuery.view.ngrams, 'must' );
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// scoring boost
query.score( peliasQuery.view.phrase );
query.score( peliasQuery.view.focus( peliasQuery.view.phrase ) );
query.score( peliasQuery.view.popularity( peliasQuery.view.phrase ) );
query.score( peliasQuery.view.population( peliasQuery.view.phrase ) );
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// address components
query.score( peliasQuery.view.address('housenumber') );
query.score( peliasQuery.view.address('street') );
query.score( peliasQuery.view.address('postcode') );
// admin components
// country_a and region_a are left as matches here because the text-analyzer
// can sometimes detect them, in which case a query more specific than a
// multi_match is appropriate.
query.score( peliasQuery.view.admin('country_a') );
query.score( peliasQuery.view.admin('region_a') );
query.score( peliasQuery.view.admin_multi_match(adminFields, 'peliasAdmin') );
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// non-scoring hard filters
query.filter( peliasQuery.view.boundary_circle );
query.filter( peliasQuery.view.boundary_rect );
query.filter( peliasQuery.view.sources );
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// --------------------------------
/**
map request variables to query variables for all inputs
provided by this HTTP request.
**/
function generateQuery( clean ){
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var vs = new peliasQuery.Vars( defaults );
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// input text
vs.var( 'input:name', clean.text );
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// sources
vs.var( 'sources', clean.sources);
// size
if( clean.querySize ) {
vs.var( 'size', clean.querySize );
}
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// focus point
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if( check.number(clean['focus.point.lat']) &&
check.number(clean['focus.point.lon']) ){
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vs.set({
'focus:point:lat': clean['focus.point.lat'],
'focus:point:lon': clean['focus.point.lon']
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});
}
// focus viewport
if( check.number(clean['focus.viewport.min_lat']) &&
check.number(clean['focus.viewport.max_lat']) &&
check.number(clean['focus.viewport.min_lon']) &&
check.number(clean['focus.viewport.max_lon']) ) {
// calculate the centroid from the viewport box
vs.set({
'focus:point:lat': clean['focus.viewport.min_lat'] + ( clean['focus.viewport.max_lat'] - clean['focus.viewport.min_lat'] ) / 2,
'focus:point:lon': clean['focus.viewport.min_lon'] + ( clean['focus.viewport.max_lon'] - clean['focus.viewport.min_lon'] ) / 2
//, 'focus:scale': calculateDiagonalDistance(clean) + 'km'
});
}
// boundary rect
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if( check.number(clean['boundary.rect.min_lat']) &&
check.number(clean['boundary.rect.max_lat']) &&
check.number(clean['boundary.rect.min_lon']) &&
check.number(clean['boundary.rect.max_lon']) ){
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vs.set({
'boundary:rect:top': clean['boundary.rect.max_lat'],
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'boundary:rect:right': clean['boundary.rect.max_lon'],
'boundary:rect:bottom': clean['boundary.rect.min_lat'],
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'boundary:rect:left': clean['boundary.rect.min_lon']
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});
}
// boundary circle
// @todo: change these to the correct request variable names
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if( check.number(clean['boundary.circle.lat']) &&
check.number(clean['boundary.circle.lon']) ){
vs.set({
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'boundary:circle:lat': clean['boundary.circle.lat'],
'boundary:circle:lon': clean['boundary.circle.lon']
});
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if( check.number(clean['boundary.circle.radius']) ){
vs.set({
'boundary:circle:radius': Math.round( clean['boundary.circle.radius'] ) + 'km'
});
}
}
// boundary country
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if( check.string(clean['boundary.country']) ){
vs.set({
'boundary:country': clean['boundary.country']
});
}
// run the address parser
if( clean.parsed_text ){
textParser( clean.parsed_text, vs );
}
return query.render( vs );
}
// return diagonal distance in km, with min=1
function calculateDiagonalDistance(clean) {
var diagonalDistance = geolib.getDistance(
{ latitude: clean['focus.viewport.min_lat'], longitude: clean['focus.viewport.min_lon'] },
{ latitude: clean['focus.viewport.max_lat'], longitude: clean['focus.viewport.max_lon'] },
1000
) / 1000;
return Math.max(diagonalDistance, 1);
}
module.exports = generateQuery;