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var logger = require('../src/logger'),
get_layers = require('../helper/layers');
// Build pelias suggest query
function generate( params, query_mixer, fuzziness ){
var CmdGenerator = function(params){
this.params = params;
this.cmd = {
'text': params.input
};
};
CmdGenerator.prototype.get_precision = function() {
var zoom = this.params.zoom;
switch (true) {
case (zoom > 15):
return 5; // zoom: >= 16
case (zoom > 9):
return 4; // zoom: 10-15
case (zoom > 5):
return 3; // zoom: 6-9
case (zoom > 3):
return 2; // zoom: 4-5
default:
return 1; // zoom: 1-3 or when zoom: undefined
}
};
CmdGenerator.prototype.add_suggester = function(name, precision, layers, fuzzy) {
this.cmd[name] = {
'completion' : {
'size' : this.params.size,
'field' : 'suggest',
'context': {
'dataset': this.params.layers || layers,
'location': {
'value': null,
'precision': precision || this.get_precision()
}
},
'fuzzy': {
'fuzziness': fuzzy || fuzziness || 0
}
}
};
if (!isNaN(this.params.lon) && !isNaN(this.params.lat)) {
this.cmd[name].completion.context.location.value = [ this.params.lon, this.params.lat ];
}
};
var cmd = new CmdGenerator(params);
var suggester_index = 0;
if (query_mixer && query_mixer.length) {
query_mixer.forEach(function(item, index){
var expanded_layers = get_layers(item.layers);
if (item.precision && Array.isArray( item.precision ) && item.precision.length ) {
item.precision.forEach(function(precision) {
cmd.add_suggester(suggester_index++, precision, expanded_layers, item.fuzzy);
});
} else {
cmd.add_suggester(suggester_index++, undefined, expanded_layers, item.fuzzy);
}
});
} else {
cmd.add_suggester(suggester_index++);
}
// logger.log( 'cmd', JSON.stringify( cmd.cmd, null, 2 ) );
return cmd.cmd;
}
module.exports = generate;