add paginator

lib/pages/package/model/package_model.dart

@@ -1,102 +1,132 @@
 import 'dart:async';
 import 'dart:io';
-import 'package:fcs/data/services/services.dart';
-import 'package:fcs/domain/vo/delivery_address.dart';
-import 'package:fcs/domain/vo/message.dart';
-import 'package:fcs/helpers/pagination.dart';
-import 'package:path/path.dart' as Path;
 
 import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/data/services/services.dart';
 import 'package:fcs/domain/constants.dart';
 import 'package:fcs/domain/entities/package.dart';
 import 'package:fcs/domain/entities/user.dart';
+import 'package:fcs/domain/vo/delivery_address.dart';
+import 'package:fcs/domain/vo/message.dart';
 import 'package:fcs/helpers/firebase_helper.dart';
+import 'package:fcs/helpers/paginator.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
 import 'package:logging/logging.dart';
+import 'package:path/path.dart' as Path;
 
 class PackageModel extends BaseModel {
   final log = Logger('PackageModel');
 
   StreamSubscription<QuerySnapshot> listener;
   StreamSubscription<QuerySnapshot> customerPackageListener;
-  Pagination pagination;
 
-  List<Package> packages = [];
-  List<Package> customerPackages = [];
-  List<Package> deliveredPackages = [];
+  List<Package> get packages =>
+      _selectedIndex == 1 ? _packages : List<Package>.from(_delivered.values);
+  List<Package> get customerPackages => _selectedIndex == 1
+      ? _customerPackages
+      : List<Package>.from(_customerDelivered.values);
 
-  bool endOfDeliveredPackages = false;
+  List<Package> _packages = [];
+  List<Package> _customerPackages = [];
+
+  Paginator _delivered;
+  Paginator _customerDelivered;
   bool isLoading = false;
+  bool isPackagesEnded = false;
+  bool isCustomerPackagesEnded = false;
+  int _selectedIndex = 1;
+  set selectedIndex(int index) {
+    _selectedIndex = index;
+    notifyListeners();
+  }
+
+  get selectedIndex => _selectedIndex;
 
   @override
   void privilegeChanged() {
     super.privilegeChanged();
     _loadPackages();
     _loadCustomerPackages();
+
+    if (_delivered != null) _delivered.close();
+    _delivered = _getDeliveredExample(false);
+    loadMore(isCustomer: false);
+    if (_customerDelivered != null) _customerDelivered.close();
+    _customerDelivered = _getDeliveredExample(false);
+    loadMore(isCustomer: true);
   }
 
   @override
   logout() async {
+    if (_delivered != null) _delivered.close();
+    if (_customerDelivered != null) _customerDelivered.close();
     if (listener != null) await listener.cancel();
     if (customerPackageListener != null) await customerPackageListener.cancel();
-    if (pagination != null) pagination.close();
-    packages = [];
-    customerPackages = [];
-    deliveredPackages = [];
+    _packages = [];
+    _customerPackages = [];
   }
 
-  Future<void> initDeliveredPackages(bool onlyFcs) {
-    if (onlyFcs) {
+  Future<void> loadMore({bool isCustomer}) async {
+    if (selectedIndex == 1)
+      return; // when delivered menu is not selected return
+    var p = isCustomer ? _customerDelivered : _delivered;
+    if (p.ended) return;
+    isLoading = true;
+    notifyListeners();
+    await p.load(onFinished: () {
+      isLoading = false;
+      notifyListeners();
+    });
+  }
+
+  Future<void> refresh({bool isCustomer}) async {
+    if (selectedIndex == 1)
+      return; // when delivered menu is not selected return
+    var p = isCustomer ? _customerDelivered : _delivered;
+    await p.refresh(onFinished: () {
+      notifyListeners();
+    });
+  }
+
+  Paginator _getDelivered(bool isCustomer) {
+    if (!isCustomer) {
       if (user == null ||
           !((user.hasPackages() ||
               user.hasReceiving() ||
-              user.hasProcessing()))) return null;
+              user.hasProcessing()))) throw "No privilege";
     }
-    if (pagination != null) pagination.close();
-    deliveredPackages = [];
-    endOfDeliveredPackages = false;
-    isLoading = false;
-
     var pageQuery = Firestore.instance
         .collection("/$packages_collection")
-        // .collection(
-        //     "/users/8OTfsbVvsUOn1SLxy1OrKk7Y_yNKkVoGalPcIlcHnAY/messages")
-        // .orderBy("date", descending: true);
         .where("is_delivered", isEqualTo: true)
         .where("is_deleted", isEqualTo: false);
-    if (!onlyFcs) {
+    if (isCustomer) {
       pageQuery = pageQuery.where("user_id", isEqualTo: user.id);
     }
     pageQuery = pageQuery.orderBy("current_status_date", descending: true);
-    pagination = new Pagination(pageQuery, rowPerLoad: 20);
-    pagination.stream.listen((doc) {
-      if (doc == null) {
-        endOfDeliveredPackages = true;
-      } else {
-        deliveredPackages.add(Package.fromMap(doc.data, doc.documentID));
-        // var m = Message.fromMap(doc.data, doc.documentID);
-        // deliveredPackages.add(Package(
-        //     id: m.id,
-        //     status: package_delivered_status,
-        //     currentStatus: package_delivered_status,
-        //     currentStatusDate: m.date,
-        //     trackingID: (count++).toString(),
-        //     market: m.message));
-      }
+    var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
+      return Package.fromMap(data, id);
     });
-    return null;
+    return paginator;
   }
 
-  Future<bool> loadMoreDeliveredPackages() {
-    if (pagination != null && !isLoading && !endOfDeliveredPackages) {
-      isLoading = true;
-      notifyListeners();
-      pagination.load().then((value) {
-        isLoading = false;
-        notifyListeners();
-      });
-    }
-    return null;
+  int count = 0;
+  Paginator _getDeliveredExample(bool onlyFcs) {
+    count = 1;
+    var pageQuery = Firestore.instance
+        .collection(
+            "/users/8OTfsbVvsUOn1SLxy1OrKk7Y_yNKkVoGalPcIlcHnAY/messages")
+        .orderBy("date", descending: true);
+    var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
+      var m = Message.fromMap(data, id);
+      return Package(
+          id: m.id,
+          status: package_delivered_status,
+          currentStatus: package_delivered_status,
+          currentStatusDate: m.date,
+          trackingID: (count++).toString(),
+          market: m.message);
+    });
+    return paginator;
   }
 
   Future<void> _loadPackages() async {
@@ -105,7 +135,7 @@ class PackageModel extends BaseModel {
       return;
     String path = "/$packages_collection";
     if (listener != null) listener.cancel();
-    packages = [];
+    _packages = [];
 
     try {
       var q = Firestore.instance
@@ -114,8 +144,8 @@ class PackageModel extends BaseModel {
           .where("is_deleted", isEqualTo: false);
 
       listener = q.snapshots().listen((QuerySnapshot snapshot) {
-        packages.clear();
-        packages = snapshot.documents.map((documentSnapshot) {
+        _packages.clear();
+        _packages = snapshot.documents.map((documentSnapshot) {
           var package = Package.fromMap(
               documentSnapshot.data, documentSnapshot.documentID);
           return package;
@@ -131,7 +161,7 @@ class PackageModel extends BaseModel {
     if (user == null) return;
     String path = "/$packages_collection";
     if (customerPackageListener != null) customerPackageListener.cancel();
-    customerPackages = [];
+    _customerPackages = [];
 
     try {
       var q = Firestore.instance
@@ -141,8 +171,8 @@ class PackageModel extends BaseModel {
           .where("user_id", isEqualTo: user.id);
 
       customerPackageListener = q.snapshots().listen((QuerySnapshot snapshot) {
-        customerPackages.clear();
-        customerPackages = snapshot.documents.map((documentSnapshot) {
+        _customerPackages.clear();
+        _customerPackages = snapshot.documents.map((documentSnapshot) {
           var package = Package.fromMap(
               documentSnapshot.data, documentSnapshot.documentID);
           return package;