Maps & Geocoding APIs
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// Production Autocomplete Session Token Lifecycle Manager
class LocationAutocompleteManager {
  constructor() {
    this.sessionToken = null;
    this.autocompleteService = new google.maps.places.AutocompleteService();
    this.placesService = new google.maps.places.PlacesService(document.createElement('div'));
    this.renewSessionToken();
  }

  renewSessionToken() {
    // Session token groups keystrokes into a single billing event
    this.sessionToken = new google.maps.places.AutocompleteSessionToken();
  }

  async fetchSuggestions(inputQuery) {
    if (!inputQuery || inputQuery.length < 3) return [];
    
    return new Promise((resolve, reject) => {
      this.autocompleteService.getPlacePredictions({
        input: inputQuery,
        sessionToken: this.sessionToken,
        componentRestrictions: { country: ['us', 'ca'] }
      }, (predictions, status) => {
        if (status === google.maps.places.PlacesServiceStatus.OK) {
          resolve(predictions);
        } else {
          resolve([]);
        }
      });
    });
  }

  async selectPlace(placeId) {
    return new Promise((resolve, reject) => {
      // Passing sessionToken closes the billing cycle into a single SKU
      this.placesService.getDetails({
        placeId: placeId,
        fields: ['formatted_address', 'geometry', 'address_components'],
        sessionToken: this.sessionToken
      }, (place, status) => {
        // Immediately renew token for the next user entry
        this.renewSessionToken();
        if (status === google.maps.places.PlacesServiceStatus.OK) {
          resolve(place);
        } else {
          reject(status);
        }
      });
    });
  }
}

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