80 lines
1.9 KiB
Dart
80 lines
1.9 KiB
Dart
// Represents a collection of landmarks that represent a journey
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// Different instances of a Trip can be saved and loaded by the user
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import 'dart:collection';
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import 'dart:convert';
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import 'package:anyway/structs/landmark.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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class Trip {
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final String uuid;
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final String cityName;
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// TODO: cityName should be inferred from coordinates of the Landmarks
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final int totalTime;
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final LinkedList<Landmark> landmarks;
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// could be empty as well
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Trip({
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required this.uuid,
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required this.cityName,
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required this.landmarks,
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this.totalTime = 0
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});
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factory Trip.fromJson(Map<String, dynamic> json) {
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Trip trip = Trip(
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uuid: json['uuid'],
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cityName: json['city_name'] ?? 'Not communicated',
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landmarks: LinkedList()
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);
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return trip;
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}
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factory Trip.fromPrefs(SharedPreferences prefs, String uuid) {
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String? content = prefs.getString('trip_$uuid');
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Map<String, dynamic> json = jsonDecode(content!);
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Trip trip = Trip.fromJson(json);
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String? firstUUID = json['entry_uuid'];
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readLandmarks(trip.landmarks, prefs, firstUUID);
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return trip;
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}
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Map<String, dynamic> toJson() => {
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'uuid': uuid,
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'city_name': cityName,
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'first_landmark_uuid': landmarks.first.uuid
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};
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void toPrefs(SharedPreferences prefs){
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Map<String, dynamic> json = toJson();
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prefs.setString('trip_$uuid', jsonEncode(json));
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for (Landmark landmark in landmarks) {
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landmarkToPrefs(prefs, landmark, landmark.next);
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}
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}
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}
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// Helper
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readLandmarks(LinkedList<Landmark> landmarks, SharedPreferences prefs, String? firstUUID) {
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while (firstUUID != null) {
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var (head, nextUUID) = getLandmarkFromPrefs(prefs, firstUUID);
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landmarks.add(head);
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firstUUID = nextUUID;
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}
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}
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void removeAllTripsFromPrefs () async {
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SharedPreferences prefs = await SharedPreferences.getInstance();
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prefs.clear();
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}
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