Implement Artifact Class for Enhanced Data Handling (#5585)

frontend/lib/models/artifact.dart

@@ -0,0 +1,62 @@
+/// `Artifact` class represents an artifact either created by or submitted to the agent.
+///
+/// Each artifact object contains an ID, a flag indicating if it was created by the agent,
+/// a file name, and a relative path of the artifact in the agent's workspace.
+class Artifact {
+  // ID of the artifact.
+  final String artifactId;
+
+  // Whether the artifact has been created by the agent.
+  final bool agentCreated;
+
+  // Filename of the artifact.
+  final String fileName;
+
+  // Relative path of the artifact in the agent's workspace.
+  final String? relativePath;
+
+  /// Creates an `Artifact` instance.
+  ///
+  /// - `artifactId`: ID of the artifact. This is a required field.
+  /// - `agentCreated`: Indicates whether the artifact was created by the agent. This is a required field.
+  /// - `fileName`: The file name of the artifact. This is a required field.
+  /// - `relativePath`: The relative path of the artifact in the agent's workspace. This field can be null.
+  Artifact({
+    required this.artifactId,
+    required this.agentCreated,
+    required this.fileName,
+    this.relativePath,
+  });
+
+  /// Creates an `Artifact` instance from a map.
+  ///
+  /// This constructor is used for deserializing a JSON object into an `Artifact` instance.
+  /// It expects all the required fields to be present; otherwise, an error will be thrown.
+  ///
+  /// - `map`: The map from which the `Artifact` instance will be created.
+  factory Artifact.fromJson(Map<String, dynamic> map) {
+    if (map['artifact_id'] == null ||
+        map['agent_created'] == null ||
+        map['file_name'] == null) {
+      throw const FormatException(
+          'Invalid JSON: Missing one of the required fields.');
+    }
+
+    return Artifact(
+      artifactId: map['artifact_id'],
+      agentCreated: map['agent_created'],
+      fileName: map['file_name'],
+      relativePath: map['relative_path'],
+    );
+  }
+
+  /// Converts the `Artifact` instance into a JSON object.
+  ///
+  /// This can be useful for encoding the `Artifact` object into a JSON string.
+  Map<String, dynamic> toJson() => {
+        'artifact_id': artifactId,
+        'agent_created': agentCreated,
+        'file_name': fileName,
+        'relative_path': relativePath,
+      };
+}

frontend/lib/models/chat.dart

@@ -1,3 +1,4 @@
+import 'package:auto_gpt_flutter_client/models/artifact.dart';
 import 'package:auto_gpt_flutter_client/models/message_type.dart';
 
 /// Represents a chat message related to a specific task.
@@ -8,7 +9,7 @@ class Chat {
   final DateTime timestamp;
   final MessageType messageType;
   final Map<String, dynamic>? jsonResponse;
-  final List<dynamic> artifacts;
+  final List<Artifact> artifacts;
 
   Chat({
     required this.id,
@@ -29,7 +30,10 @@ class Chat {
       timestamp: DateTime.parse(map['timestamp']),
       messageType: MessageType.values.firstWhere(
           (e) => e.toString() == 'MessageType.${map['messageType']}'),
-      artifacts: List<dynamic>.from(map['artifacts'] ?? []),
+      artifacts: (map['artifacts'] as List)
+          .map(
+              (artifact) => Artifact.fromJson(artifact as Map<String, dynamic>))
+          .toList(),
     );
   }
 

frontend/lib/models/step.dart

@@ -1,4 +1,6 @@
 // TODO: Refactor this to match which values are required and optional
+import 'package:auto_gpt_flutter_client/models/artifact.dart';
+
 class Step {
   final String input;
   final Map<String, dynamic> additionalInput;
@@ -8,8 +10,7 @@ class Step {
   final String status;
   final String output;
   final Map<String, dynamic> additionalOutput;
-  // TODO: Create an actual artifact object
-  final List<dynamic> artifacts;
+  final List<Artifact> artifacts;
   final bool isLast;
 
   Step({
@@ -42,8 +43,10 @@ class Step {
       additionalOutput: map['additional_output'] != null
           ? Map<String, dynamic>.from(map['additional_output'])
           : {},
-      artifacts:
-          map['artifacts'] != null ? List<dynamic>.from(map['artifacts']) : [],
+      artifacts: (map['artifacts'] as List)
+          .map(
+              (artifact) => Artifact.fromJson(artifact as Map<String, dynamic>))
+          .toList(),
       isLast: map['is_last'] ?? false,
     );
   }

frontend/lib/views/chat/chat_view.dart

@@ -90,18 +90,10 @@ class _ChatViewState extends State<ChatView> {
                     key: ValueKey(chat.id),
                     chat: chat,
                     onArtifactsButtonPressed: () {
-                      // TODO: Create an actual artifact object
                       // Loop through each artifact and download it using the artifact_id
                       for (var artifact in chat.artifacts) {
-                        if (artifact is Map) {
-                          final artifactMap = artifact.cast<String,
-                              dynamic>(); // Cast each item to Map<String, dynamic>
-
-                          final artifactId = artifactMap['artifact_id']
-                              .toString(); // Get the artifact_id
-                          widget.viewModel.downloadArtifact(
-                              chat.taskId, artifactId); // Download the artifact
-                        }
+                        widget.viewModel
+                            .downloadArtifact(chat.taskId, artifact.artifactId);
                       }
                     },
                   );