Refactor response widgets

lib/widgets/response_body.dart

@@ -0,0 +1,67 @@
+import 'package:flutter/material.dart';
+import 'package:apidash_core/apidash_core.dart';
+import 'package:apidash/models/models.dart';
+import 'package:apidash/utils/utils.dart';
+import 'package:apidash/consts.dart';
+import 'error_message.dart';
+import 'response_body_success.dart';
+
+class ResponseBody extends StatelessWidget {
+  const ResponseBody({
+    super.key,
+    this.selectedRequestModel,
+  });
+
+  final RequestModel? selectedRequestModel;
+
+  @override
+  Widget build(BuildContext context) {
+    final responseModel = selectedRequestModel?.httpResponseModel;
+    if (responseModel == null) {
+      return const ErrorMessage(
+          message: '$kNullResponseModelError $kUnexpectedRaiseIssue');
+    }
+
+    var body = responseModel.body;
+    var formattedBody = responseModel.formattedBody;
+    if (body == null) {
+      return const ErrorMessage(
+          message: '$kMsgNullBody $kUnexpectedRaiseIssue');
+    }
+    if (body.isEmpty) {
+      return const ErrorMessage(
+        message: kMsgNoContent,
+        showIcon: false,
+        showIssueButton: false,
+      );
+    }
+
+    final mediaType =
+        responseModel.mediaType ?? MediaType(kTypeText, kSubTypePlain);
+    // Fix #415: Treat null Content-type as plain text instead of Error message
+    // if (mediaType == null) {
+    //   return ErrorMessage(
+    //       message:
+    //           '$kMsgUnknowContentType - ${responseModel.contentType}. $kUnexpectedRaiseIssue');
+    // }
+
+    var responseBodyView = getResponseBodyViewOptions(mediaType);
+    var options = responseBodyView.$1;
+    var highlightLanguage = responseBodyView.$2;
+
+    if (formattedBody == null) {
+      options = [...options];
+      options.remove(ResponseBodyView.code);
+    }
+
+    return ResponseBodySuccess(
+      key: Key("${selectedRequestModel!.id}-response"),
+      mediaType: mediaType,
+      options: options,
+      bytes: responseModel.bodyBytes!,
+      body: body,
+      formattedBody: formattedBody,
+      highlightLanguage: highlightLanguage,
+    );
+  }
+}