fetchSuggestions method

Future<List<Suggestion>> fetchSuggestions(String input, { bool includeFullSuggestionDetails = false, required List<AutoCompleteType> types, })

includeFullSuggestionDetails if we should include ALL details that are returned in API suggestions. (This is sent as true when the onInitialSuggestionClick is in use) postalCodeLookup if we should request postal_code type return information instead of address type information.

Implementation

Future<List<Suggestion>> fetchSuggestions(String input,
    {bool includeFullSuggestionDetails = false,
    required List<AutoCompleteType> types}) async {
  /// OK, we need to check the types array..
  String typesString = '';
  for (final type in types) {
    if (type.onlySingleValueAllowed && types.length > 1) {
      throw Exception(
          'If $type is specified then it is the ONLY autocomplete type allowed by Google Places. See https://developers.google.com/maps/documentation/places/web-service/autocomplete#types');
    }
    if (typesString.isNotEmpty) typesString += '|';
    typesString += type.typeString;
  }
  if (types.length > 5) {
    throw Exception(
        'A maximum of 5 autocomplete types are allowed by Google Places. See https://developers.google.com/maps/documentation/places/web-service/autocomplete#types');
  }

  final Map<String, dynamic> parameters = <String, dynamic>{
    'input': input,
    'types': typesString,
    'key': mapsApiKey,
    'sessiontoken': sessionToken
  };

  if (language != null) {
    parameters.addAll(<String, dynamic>{'language': language});
  }
  if (compomentCountry != null) {
    parameters
        .addAll(<String, dynamic>{'components': 'country:$compomentCountry'});
  }

  final Uri request = Uri(
      scheme: 'https',
      host: 'maps.googleapis.com',
      path: '/maps/api/place/autocomplete/json',
      queryParameters: parameters);

  final response = await client.get(request);

  if (response.statusCode == 200) {
    final result = json.decode(response.body);
    if (result['status'] == 'OK') {
      if (debugJson) {
        printJson(result['predictions'],
            title: 'GOOGLE MAP API RETURN VALUE result["predictions"]');
      }

      // compose suggestions in a list
      return result['predictions'].map<Suggestion>((p) {
        if (includeFullSuggestionDetails) {
          // Package everything useful from API json
          final mainText = p['structured_formatting']?['main_text'];
          final secondaryText = p['structured_formatting']?['secondary_text'];
          final terms = p['terms']
              .map<String>((term) => term['value'] as String)
              .toList();
          final types =
              p['types'].map<String>((atype) => atype as String).toList();

          return Suggestion(p['place_id'], p['description'],
              mainText: mainText,
              secondaryText: secondaryText,
              terms: terms,
              types: types);
        } else {
          // just use the simple Suggestion parts we need
          return Suggestion(p['place_id'], p['description']);
        }
      }).toList();
    }
    if (result['status'] == 'ZERO_RESULTS') {
      return [];
    }
    throw Exception(result['error_message']);
  } else {
    throw Exception('Failed to fetch suggestion');
  }
}