refactor importer

lib/importer/import_dialog.dart

@@ -0,0 +1,50 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:apidash/providers/providers.dart';
+import 'package:apidash/widgets/widgets.dart';
+import 'importer.dart';
+
+void importToCollectionPane(
+  BuildContext context,
+  WidgetRef ref,
+  ScaffoldMessengerState sm,
+) {
+  // TODO: The dialog must have a feature to paste contents in a text field
+  // Also, a mechanism can be added where on importing a file it shows the
+  // contents in the text field and then the user presses ok to add it to collection
+  showImportDialog(
+    context: context,
+    importFormat: ref.watch(importFormatStateProvider),
+    onImportFormatChange: (format) {
+      if (format != null) {
+        ref.read(importFormatStateProvider.notifier).state = format;
+      }
+    },
+    onFileDropped: (file) {
+      final importFormatType = ref.read(importFormatStateProvider);
+      sm.hideCurrentSnackBar();
+      file.readAsString().then(
+        (content) {
+          kImporter
+              .getHttpRequestModel(importFormatType, content)
+              .then((importedRequestModel) {
+            if (importedRequestModel != null) {
+              ref
+                  .read(collectionStateNotifierProvider.notifier)
+                  .addRequestModel(importedRequestModel);
+              if (!context.mounted) return;
+              Navigator.of(context).pop();
+            } else {
+              var err = "Unable to parse ${file.name}";
+              sm.showSnackBar(getSnackBar(err, small: false));
+            }
+          });
+        },
+        onError: (e) {
+          var err = "Unable to import ${file.name}";
+          sm.showSnackBar(getSnackBar(err, small: false));
+        },
+      );
+    },
+  );
+}