Add new friends system, and sharing legs support

lib/services/data_service/data_service_friendships.dart

@@ -0,0 +1,282 @@
+part of 'data_service.dart';
+
+extension DataServiceFriendships on DataService {
+  Future<void> fetchFriendships() async {
+    _isFriendshipsLoading = true;
+    try {
+      final json = await api.get('/friendships');
+      List<dynamic>? list;
+      if (json is List) {
+        list = json;
+      } else if (json is Map) {
+        for (final key in ['friendships', 'data', 'items', 'results']) {
+          final value = json[key];
+          if (value is List) {
+            list = value;
+            break;
+          }
+        }
+      }
+      final parsed = list
+          ?.whereType<Map>()
+          .map((e) => Friendship.fromJson(
+                e.map((k, v) => MapEntry(k.toString(), v)),
+              ))
+          .where((f) => f.isAccepted)
+          .toList();
+      _friendships = parsed ?? [];
+    } catch (e) {
+      debugPrint('Failed to fetch friendships: $e');
+      _friendships = [];
+    } finally {
+      _isFriendshipsLoading = false;
+      _notifyAsync();
+    }
+  }
+
+  Future<void> fetchPendingFriendships() async {
+    _isPendingFriendshipsLoading = true;
+    try {
+      final incoming = await _fetchPending('incoming');
+      final outgoing = await _fetchPending('outgoing');
+      _pendingIncoming = incoming;
+      _pendingOutgoing = outgoing;
+    } catch (e) {
+      debugPrint('Failed to fetch pending friendships: $e');
+      _pendingIncoming = [];
+      _pendingOutgoing = [];
+    } finally {
+      _isPendingFriendshipsLoading = false;
+      _notifyAsync();
+    }
+  }
+
+  Future<List<Friendship>> _fetchPending(String direction) async {
+    final json = await api.get('/friendships/pending?direction=$direction');
+    List<dynamic>? list;
+    if (json is List) {
+      list = json;
+    } else if (json is Map) {
+      for (final key in ['friendships', 'data', 'items', 'results']) {
+        final value = json[key];
+        if (value is List) {
+          list = value;
+          break;
+        }
+      }
+    }
+    return list
+            ?.whereType<Map>()
+            .map((e) => Friendship.fromJson(
+                  e.map((k, v) => MapEntry(k.toString(), v)),
+                ))
+            .where((f) => f.isPending)
+            .toList() ??
+        const [];
+  }
+
+  Future<Friendship?> fetchFriendshipById(String friendshipId) async {
+    try {
+      final json = await api.get('/friendships/$friendshipId');
+      if (json is Map) {
+        return Friendship.fromJson(
+          json.map((k, v) => MapEntry(k.toString(), v)),
+        );
+      }
+    } catch (e) {
+      debugPrint('Failed to fetch friendship $friendshipId: $e');
+    }
+    return null;
+  }
+
+  Future<List<UserSummary>> searchUsers(
+    String query, {
+    bool friendsOnly = false,
+  }) async {
+    final encoded = Uri.encodeComponent(query);
+    final json = await api.get(
+      '/users/search?search=$encoded${friendsOnly ? '&friends_only=true' : ''}',
+    );
+    List<dynamic>? list;
+    if (json is List) {
+      list = json;
+    } else if (json is Map) {
+      for (final key in ['users', 'data', 'results', 'items']) {
+        final value = json[key];
+        if (value is List) {
+          list = value;
+          break;
+        }
+      }
+    }
+    if (list == null) return const [];
+    return list
+        .whereType<Map>()
+        .map((e) => UserSummary.fromJson(
+              e.map((k, v) => MapEntry(k.toString(), v)),
+            ))
+        .toList();
+  }
+
+  Future<Friendship> fetchFriendshipStatus(String targetUserId) async {
+    try {
+      final json = await api.get('/friendships/status/$targetUserId');
+      if (json is Map) {
+        return Friendship.fromStatusJson(
+          json.map((k, v) => MapEntry(k.toString(), v)),
+          targetUserId: targetUserId,
+        );
+      }
+    } catch (e) {
+      debugPrint('Failed to fetch friendship status for $targetUserId: $e');
+    }
+    return Friendship(
+      id: null,
+      status: 'none',
+      requesterId: '',
+      addresseeId: targetUserId,
+    );
+  }
+
+  Future<Friendship> requestFriendship(
+    String targetUserId, {
+    UserSummary? targetUser,
+  }) async {
+    final json = await api.post('/friendships/request', {
+      "target_user_id": targetUserId,
+    });
+    final friendship = _parseAndUpsertFriendship(
+      json,
+      fallbackStatus: 'pending',
+      overrideAddressee: targetUser,
+    );
+    _pendingOutgoing = [friendship, ..._pendingOutgoing];
+    _notifyAsync();
+    return friendship;
+  }
+
+  Future<Friendship> acceptFriendship(String friendshipId) async {
+    final json = await api.post('/friendships/$friendshipId/accept', {});
+    final friendship = _parseAndUpsertFriendship(json, fallbackStatus: 'accepted');
+    _pendingIncoming = _pendingIncoming.where((f) => f.id != friendshipId).toList();
+    _notifyAsync();
+    return friendship;
+  }
+
+  Future<Friendship> rejectFriendship(String friendshipId) async {
+    final json = await api.post('/friendships/$friendshipId/reject', {});
+    final friendship = _parseAndUpsertFriendship(json, fallbackStatus: 'declined');
+    _pendingIncoming = _pendingIncoming.where((f) => f.id != friendshipId).toList();
+    _notifyAsync();
+    return friendship;
+  }
+
+  Future<Friendship> cancelFriendship(String friendshipId) async {
+    final json = await api.post('/friendships/$friendshipId/cancel', {});
+    final friendship =
+        _parseAndRemoveFriendship(json, friendshipId, status: 'none');
+    _pendingOutgoing =
+        _pendingOutgoing.where((f) => f.id != friendshipId).toList();
+    _notifyAsync();
+    return friendship;
+  }
+
+  Future<void> deleteFriendship(String friendshipId) async {
+    try {
+      await api.delete('/friendships/$friendshipId');
+    } catch (e) {
+      debugPrint('Failed to delete friendship $friendshipId: $e');
+      rethrow;
+    }
+    _friendships = _friendships.where((f) => f.id != friendshipId).toList();
+    _pendingIncoming =
+        _pendingIncoming.where((f) => f.id != friendshipId).toList();
+    _pendingOutgoing =
+        _pendingOutgoing.where((f) => f.id != friendshipId).toList();
+    _notifyAsync();
+  }
+
+  Future<Friendship> blockUser(String targetUserId) async {
+    final json = await api.post('/friendships/block', {
+      "target_user_id": targetUserId,
+    });
+    final friendship = _parseAndUpsertFriendship(json, fallbackStatus: 'blocked');
+    _pendingIncoming = _pendingIncoming
+        .where((f) => f.addresseeId != targetUserId && f.requesterId != targetUserId)
+        .toList();
+    _pendingOutgoing = _pendingOutgoing
+        .where((f) => f.addresseeId != targetUserId && f.requesterId != targetUserId)
+        .toList();
+    _notifyAsync();
+    return friendship;
+  }
+
+  Friendship _parseAndUpsertFriendship(
+    dynamic json, {
+    String fallbackStatus = 'none',
+    UserSummary? overrideAddressee,
+  }) {
+    Friendship friendship;
+    if (json is Map) {
+      friendship = Friendship.fromJson(
+        json.map((k, v) => MapEntry(k.toString(), v)),
+      );
+    } else {
+      friendship = Friendship(
+        id: null,
+        status: fallbackStatus,
+        requesterId: '',
+        addresseeId: '',
+      );
+    }
+    if (overrideAddressee != null &&
+        (friendship.addressee == null ||
+            friendship.addressee!.userId.isEmpty ||
+            friendship.addressee!.displayName.isEmpty)) {
+      friendship = friendship.copyWith(
+        addressee: overrideAddressee,
+        addresseeId: overrideAddressee.userId,
+      );
+    }
+    _upsertFriendship(friendship);
+    return friendship;
+  }
+
+  Friendship _parseAndRemoveFriendship(
+    dynamic json,
+    String friendshipId, {
+    required String status,
+  }) {
+    Friendship friendship;
+    if (json is Map) {
+      friendship = Friendship.fromJson(
+        json.map((k, v) => MapEntry(k.toString(), v)),
+      );
+    } else {
+      friendship = Friendship(
+        id: friendshipId,
+        status: status,
+        requesterId: '',
+        addresseeId: '',
+      );
+    }
+    _friendships = _friendships.where((f) => f.id != friendshipId).toList();
+    _notifyAsync();
+    return friendship;
+  }
+
+  void _upsertFriendship(Friendship friendship) {
+    if (friendship.id == null || friendship.id!.isEmpty) {
+      _notifyAsync();
+      return;
+    }
+    final idx = _friendships.indexWhere((f) => f.id == friendship.id);
+    if (idx >= 0) {
+      _friendships[idx] = friendship;
+    } else {
+      _friendships = [friendship, ..._friendships];
+    }
+    _friendships = _friendships.where((f) => f.isAccepted).toList();
+    _notifyAsync();
+  }
+}