add structure

lib/model/notification_model.dart

@@ -0,0 +1,74 @@
+import 'dart:async';
+
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/vo/notification.dart';
+
+import 'base_model.dart';
+import 'constants.dart';
+import 'firebase_helper.dart';
+
+class NotificationModel extends BaseModel {
+  int filer=0;
+  List<Notification> notifications = [];
+
+  var filterValues = {1: "po", 2: "do", 3: "buyer"};
+  List<Notification> get notis {
+    return notifications
+        .where((n) => filer == 0 || n.itemType == filterValues[filer])
+        .toList();
+  }
+
+  int unseen = 0;
+
+  void initUser(user) {
+    super.initUser(user);
+    _loadNotifications();
+  }
+
+
+  @override
+  logout() async {
+    notifications = [];
+  }
+
+  Future<void> _loadNotifications() async {
+    Stream<QuerySnapshot> snapshots = Firestore.instance
+        .collection(
+            "/$biz_collection/${setting.okEnergyId}/$user_collection/${user.docID}/$notification_collection")
+        .orderBy("time", descending: true)
+        .limit(50)
+        .snapshots();
+
+    snapshots.listen((snaps) async {
+      notifications.clear();
+      unseen = 0;
+      // snaps.documentChanges.forEach((c) {
+      //   if (c.type == DocumentChangeType.added) {
+      //     FlutterRingtonePlayer.play(
+      //       android: AndroidSounds.notification,
+      //       ios: IosSounds.glass,
+      //     );
+      //   }
+      // });
+      snaps.documents.forEach((d) {
+        var n = Notification.fromMap(d.data, d.documentID);
+        if (!n.seen) unseen++;
+        notifications.add(n);
+      });
+      notifyListeners();
+    });
+  }
+
+  void filter(int filter) {
+    this.filer = filter;
+  }
+
+  Future<void> seen() async {
+    await request("/notification/seen", "POST", token: await getToken());
+  }
+
+  Future<void> seenID(String id) async {
+    await request("/notification/seen/${user.docID}/$id", "POST",
+        token: await getToken());
+  }
+}