Added URL selection menu for mass imports

lib/pages/import_export.dart

@@ -267,30 +267,44 @@ class _ImportExportPageState extends State<ImportExportPage> {
                                                       );
                                                     }).then((values) {
                                                   if (values != null) {
-                                                    source
-                                                        .getUrls(values)
-                                                        .then((urls) {
                                                     setState(() {
                                                       importInProgress = true;
                                                     });
-                                                      addApps(urls)
+                                                    source
-                                                          .then((errors) {
+                                                        .getUrls(values)
-                                                        if (errors.isEmpty) {
+                                                        .then((urls) {
-                                                          ScaffoldMessenger.of(
+                                                      showDialog<List<String>?>(
-                                                                  context)
-                                                              .showSnackBar(
-                                                            SnackBar(
-                                                                content: Text(
-                                                                    'Imported ${urls.length} Apps')),
-                                                          );
-                                                        } else {
-                                                          showDialog(
                                                               context: context,
+                                                              builder:
+                                                                  (BuildContext
+                                                                      ctx) {
+                                                                return UrlSelectionModal(
+                                                                    urls: urls);
+                                                              })
+                                                          .then((selectedUrls) {
+                                                        if (selectedUrls !=
+                                                            null) {
+                                                          addApps(selectedUrls)
+                                                              .then((errors) {
+                                                            if (errors
+                                                                .isEmpty) {
+                                                              ScaffoldMessenger
+                                                                      .of(context)
+                                                                  .showSnackBar(
+                                                                SnackBar(
+                                                                    content: Text(
+                                                                        'Imported ${selectedUrls.length} Apps')),
+                                                              );
+                                                            } else {
+                                                              showDialog(
+                                                                  context:
+                                                                      context,
                                                                   builder:
                                                                       (BuildContext
                                                                           ctx) {
                                                                     return ImportErrorDialog(
-                                                                    urlsLength: urls
+                                                                        urlsLength:
+                                                                            selectedUrls
                                                                                 .length,
                                                                         errors:
                                                                             errors);
@@ -302,7 +316,18 @@ class _ImportExportPageState extends State<ImportExportPage> {
                                                                   false;
                                                             });
                                                           });
+                                                        } else {
+                                                          setState(() {
+                                                            importInProgress =
+                                                                false;
+                                                          });
+                                                        }
+                                                      });
                                                     }).catchError((e) {
+                                                      setState(() {
+                                                        importInProgress =
+                                                            false;
+                                                      });
                                                       ScaffoldMessenger.of(
                                                               context)
                                                           .showSnackBar(
@@ -376,3 +401,67 @@ class _ImportErrorDialogState extends State<ImportErrorDialog> {
     );
   }
 }
+
+// ignore: must_be_immutable
+class UrlSelectionModal extends StatefulWidget {
+  UrlSelectionModal({super.key, required this.urls});
+
+  List<String> urls;
+
+  @override
+  State<UrlSelectionModal> createState() => _UrlSelectionModalState();
+}
+
+class _UrlSelectionModalState extends State<UrlSelectionModal> {
+  Map<String, bool> urlSelections = {};
+  @override
+  void initState() {
+    super.initState();
+    for (var url in widget.urls) {
+      urlSelections.putIfAbsent(url, () => true);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      scrollable: true,
+      title: const Text('Select URLs to Import'),
+      content: Column(children: [
+        ...urlSelections.keys.map((url) {
+          return Row(children: [
+            Checkbox(
+                value: urlSelections[url],
+                onChanged: (value) {
+                  setState(() {
+                    urlSelections[url] = value ?? false;
+                  });
+                }),
+            const SizedBox(
+              width: 8,
+            ),
+            Expanded(
+                child: Text(
+              Uri.parse(url).path.substring(1),
+            ))
+          ]);
+        })
+      ]),
+      actions: [
+        TextButton(
+            onPressed: () {
+              Navigator.of(context).pop();
+            },
+            child: const Text('Cancel')),
+        TextButton(
+            onPressed: () {
+              Navigator.of(context).pop(urlSelections.keys
+                  .where((url) => urlSelections[url] ?? false)
+                  .toList());
+            },
+            child: Text(
+                'Import ${urlSelections.values.where((b) => b).length} URLs'))
+      ],
+    );
+  }
+}