116 lines
3.0 KiB
Dart
116 lines
3.0 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 'dart:developer';
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import 'package:anyway/structs/landmark.dart';
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import 'package:flutter/foundation.dart';
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import 'package:geocoding/geocoding.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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class Trip with ChangeNotifier {
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String uuid;
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int totalTime;
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LinkedList<Landmark> landmarks;
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// could be empty as well
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String? errorDescription;
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Future<String> get cityName async {
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List<double>? location = landmarks.firstOrNull?.location;
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if (GeocodingPlatform.instance == null) {
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return '$location';
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} else if (location == null) {
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return 'Unknown';
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} else{
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List<Placemark> placemarks = await placemarkFromCoordinates(location[0], location[1]);
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return placemarks.first.locality ?? 'Unknown';
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}
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}
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Trip({
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this.uuid = 'pending',
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this.totalTime = 0,
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LinkedList<Landmark>? landmarks
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// a trip can be created with no landmarks, but the list should be initialized anyway
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}) : landmarks = landmarks ?? LinkedList<Landmark>();
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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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totalTime: json['total_time'],
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);
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return trip;
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}
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void loadFromJson(Map<String, dynamic> json) {
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uuid = json['uuid'];
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totalTime = json['total_time'];
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notifyListeners();
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}
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void addLandmark(Landmark landmark) {
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landmarks.add(landmark);
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notifyListeners();
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}
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void updateUUID(String newUUID) {
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uuid = newUUID;
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notifyListeners();
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}
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void removeLandmark(Landmark landmark) {
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landmarks.remove(landmark);
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notifyListeners();
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}
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void updateError(String error) {
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errorDescription = error;
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notifyListeners();
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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['first_landmark_uuid'];
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log('Loading trip $uuid with first landmark $firstUUID');
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LinkedList<Landmark> landmarks = readLandmarks(prefs, firstUUID);
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trip.landmarks = landmarks;
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// notifyListeners();
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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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'total_time': totalTime,
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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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log('Saving trip $uuid : $json');
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prefs.setString('trip_$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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LinkedList<Landmark> readLandmarks(SharedPreferences prefs, String? firstUUID) {
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LinkedList<Landmark> landmarks = LinkedList<Landmark>();
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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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return landmarks;
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}
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