Fixed bugs, added serialization for documents state

lib/features/home/view/home_page.dart

@@ -1,10 +1,19 @@
+import 'dart:developer';
+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:paperless_api/paperless_api.dart';
 import 'package:paperless_mobile/core/bloc/connectivity_cubit.dart';
 import 'package:paperless_mobile/core/bloc/paperless_server_information_cubit.dart';
+import 'package:paperless_mobile/core/global/constants.dart';
+import 'package:paperless_mobile/core/logic/error_code_localization_mapper.dart';
 import 'package:paperless_mobile/core/repository/label_repository.dart';
 import 'package:paperless_mobile/core/repository/saved_view_repository.dart';
+import 'package:paperless_mobile/features/document_upload/cubit/document_upload_cubit.dart';
+import 'package:paperless_mobile/features/document_upload/view/document_upload_preparation_page.dart';
 import 'package:paperless_mobile/features/documents/bloc/documents_cubit.dart';
 import 'package:paperless_mobile/features/documents/view/pages/documents_page.dart';
 import 'package:paperless_mobile/features/home/view/widget/bottom_navigation_bar.dart';
@@ -13,8 +22,12 @@ import 'package:paperless_mobile/features/labels/view/pages/labels_page.dart';
 import 'package:paperless_mobile/features/saved_view/cubit/saved_view_cubit.dart';
 import 'package:paperless_mobile/features/scan/bloc/document_scanner_cubit.dart';
 import 'package:paperless_mobile/features/scan/view/scanner_page.dart';
+import 'package:paperless_mobile/features/sharing/share_intent_queue.dart';
+import 'package:paperless_mobile/generated/l10n.dart';
 import 'package:paperless_mobile/util.dart';
+import 'package:permission_handler/permission_handler.dart';
 import 'package:provider/provider.dart';
+import 'package:receive_sharing_intent/receive_sharing_intent.dart';
 
 class HomePage extends StatefulWidget {
   const HomePage({Key? key}) : super(key: key);
@@ -31,6 +44,126 @@ class _HomePageState extends State<HomePage> {
   void initState() {
     super.initState();
     _initializeData(context);
+    WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
+      _listenForReceivedFiles();
+    });
+  }
+
+  void _listenForReceivedFiles() async {
+    if (ShareIntentQueue.instance.hasUnhandledFiles) {
+      Fluttertoast.showToast(msg: "Sync: Has unhandled files!");
+      await _handleReceivedFile(ShareIntentQueue.instance.pop()!);
+      Fluttertoast.showToast(msg: "Sync: File handled!");
+    }
+    ShareIntentQueue.instance.addListener(() async {
+      final queue = ShareIntentQueue.instance;
+      while (queue.hasUnhandledFiles) {
+        Fluttertoast.showToast(msg: "Async: Has unhandled files!");
+        final file = queue.pop()!;
+        await _handleReceivedFile(file);
+        Fluttertoast.showToast(msg: "Async: File handled!");
+      }
+    });
+  }
+
+  bool _isFileTypeSupported(SharedMediaFile file) {
+    return supportedFileExtensions.contains(
+      file.path.split('.').last.toLowerCase(),
+    );
+  }
+
+  Future<void> _handleReceivedFile(SharedMediaFile file) async {
+    final isGranted = await askForPermission(Permission.storage);
+
+    if (!isGranted) {
+      return;
+    }
+    showDialog(
+        context: context,
+        builder: (context) => AlertDialog(
+              title: Text("Received File."),
+              content: Column(
+                children: [
+                  Text("Path: ${file.path}"),
+                  Text("Type: ${file.type.name}"),
+                  Text("Exists: ${File(file.path).existsSync()}"),
+                  FutureBuilder<bool>(
+                    future: Permission.storage.isGranted,
+                    builder: (context, snapshot) =>
+                        Text("Has storage permission: ${snapshot.data}"),
+                  )
+                ],
+              ),
+            ));
+    SharedMediaFile mediaFile;
+    if (Platform.isIOS) {
+      // Workaround for file not found on iOS: https://stackoverflow.com/a/72813212
+      mediaFile = SharedMediaFile(
+        file.path.replaceAll('file://', ''),
+        file.thumbnail,
+        file.duration,
+        file.type,
+      );
+    } else {
+      mediaFile = file;
+    }
+
+    if (!_isFileTypeSupported(mediaFile)) {
+      Fluttertoast.showToast(
+        msg: translateError(context, ErrorCode.unsupportedFileFormat),
+      );
+      if (Platform.isAndroid) {
+        // As stated in the docs, SystemNavigator.pop() is ignored on IOS to comply with HCI guidelines.
+        await SystemNavigator.pop();
+      }
+      return;
+    }
+    final filename = extractFilenameFromPath(mediaFile.path);
+
+    try {
+      if (File(mediaFile.path).existsSync()) {
+        final bytes = File(mediaFile.path).readAsBytesSync();
+        final success = await Navigator.push<bool>(
+              context,
+              MaterialPageRoute(
+                builder: (context) => BlocProvider.value(
+                  value: DocumentUploadCubit(
+                    localVault: context.read(),
+                    documentApi: context.read(),
+                    tagRepository: context.read(),
+                    correspondentRepository: context.read(),
+                    documentTypeRepository: context.read(),
+                  ),
+                  child: DocumentUploadPreparationPage(
+                    fileBytes: bytes,
+                    filename: filename,
+                  ),
+                ),
+              ),
+            ) ??
+            false;
+        if (success) {
+          await Fluttertoast.showToast(
+            msg: S.of(context).documentUploadSuccessText,
+          );
+          SystemNavigator.pop();
+        }
+      }
+    } catch (e, stackTrace) {
+      showDialog(
+        context: context,
+        builder: (context) => AlertDialog(
+          content: Column(
+            children: [
+              Text(
+                e.toString(),
+              ),
+              Text(stackTrace.toString()),
+            ],
+          ),
+        ),
+      );
+    }
   }
 
   @override