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import 'package:auto_gpt_flutter_client/models/step.dart';
import 'package:auto_gpt_flutter_client/models/step_request_body.dart';
import 'package:auto_gpt_flutter_client/services/shared_preferences_service.dart';
import 'package:flutter/foundation.dart';
import 'package:auto_gpt_flutter_client/services/chat_service.dart';
import 'package:auto_gpt_flutter_client/models/chat.dart';
import 'package:auto_gpt_flutter_client/models/message_type.dart';
class ChatViewModel with ChangeNotifier {
final ChatService _chatService;
List<Chat> _chats = [];
String? _currentTaskId;
final SharedPreferencesService _prefsService;
bool _isWaitingForAgentResponse = false;
bool get isWaitingForAgentResponse => _isWaitingForAgentResponse;
SharedPreferencesService get prefsService => _prefsService;
bool _isContinuousMode = false;
bool get isContinuousMode => _isContinuousMode;
set isContinuousMode(bool value) {
_isContinuousMode = value;
notifyListeners();
}
ChatViewModel(this._chatService, this._prefsService);
/// Returns the current list of chats.
List<Chat> get chats => _chats;
String? get currentTaskId => _currentTaskId;
void setCurrentTaskId(String taskId) {
if (_currentTaskId != taskId) {
_currentTaskId = taskId;
fetchChatsForTask();
}
}
void clearCurrentTaskAndChats() {
_currentTaskId = null;
_chats.clear();
notifyListeners(); // Notify listeners to rebuild UI
}
/// Fetches chats from the data source for a specific task.
void fetchChatsForTask() async {
if (_currentTaskId == null) {
print("Error: Task ID is not set.");
return;
}
try {
// Fetch task steps from the data source
final Map<String, dynamic> stepsResponse =
await _chatService.listTaskSteps(_currentTaskId!, pageSize: 10000);
// Extract steps from the response
final List<dynamic> stepsJsonList = stepsResponse['steps'] ?? [];
// Convert each map into a Step object
List<Step> steps =
stepsJsonList.map((stepMap) => Step.fromMap(stepMap)).toList();
// Initialize an empty list to store Chat objects
List<Chat> chats = [];
// Generate current timestamp
DateTime currentTimestamp = DateTime.now();
for (int i = 0; i < steps.length; i++) {
Step step = steps[i];
// Create a Chat object for 'input' if it exists and is not empty
if (step.input.isNotEmpty) {
chats.add(Chat(
id: step.stepId,
taskId: step.taskId,
message: step.input,
timestamp: currentTimestamp,
messageType: MessageType.user,
artifacts: step.artifacts));
}
// Create a Chat object for 'output'
chats.add(Chat(
id: step.stepId,
taskId: step.taskId,
message: step.output,
timestamp: currentTimestamp,
messageType: MessageType.agent,
jsonResponse: stepsJsonList[i],
artifacts: step.artifacts));
}
// Assign the chats list
if (chats.length > 0) {
_chats = chats;
}
// Notify listeners to rebuild UI
notifyListeners();
print(
"Chats (and steps) fetched successfully for task ID: $_currentTaskId");
} catch (error) {
print("Error fetching chats: $error");
// TODO: Handle additional error scenarios or log them as required
}
}
/// Sends a chat message for a specific task.
void sendChatMessage(String message,
{required int continuousModeSteps, int currentStep = 1}) async {
if (_currentTaskId == null) {
print("Error: Task ID is not set.");
return;
}
_isWaitingForAgentResponse = true;
notifyListeners();
try {
// Create the request body for executing the step
StepRequestBody requestBody = StepRequestBody(input: message);
// Execute the step and get the response
Map<String, dynamic> executedStepResponse =
await _chatService.executeStep(_currentTaskId!, requestBody);
// Create a Chat object from the returned step
Step executedStep = Step.fromMap(executedStepResponse);
// Create a Chat object for the user message
if (executedStep.input.isNotEmpty) {
final userChat = Chat(
id: executedStep.stepId,
taskId: executedStep.taskId,
message: executedStep.input,
timestamp: DateTime.now(),
messageType: MessageType.user,
artifacts: executedStep.artifacts);
_chats.add(userChat);
}
// Create a Chat object for the agent message
final agentChat = Chat(
id: executedStep.stepId,
taskId: executedStep.taskId,
message: executedStep.output,
timestamp: DateTime.now(),
messageType: MessageType.agent,
jsonResponse: executedStepResponse,
artifacts: executedStep.artifacts);
_chats.add(agentChat);
// Remove the temporary message
removeTemporaryMessage();
// Notify UI of the new chats
notifyListeners();
if (_isContinuousMode && !executedStep.isLast) {
print("Continuous Mode: Step $currentStep of $continuousModeSteps");
if (currentStep < continuousModeSteps) {
sendChatMessage("",
continuousModeSteps: continuousModeSteps,
currentStep: currentStep + 1);
} else {
_isContinuousMode = false;
}
}
print("Chats added for task ID: $_currentTaskId");
} catch (e) {
// Remove the temporary message in case of an error
removeTemporaryMessage();
// TODO: We are bubbling up the full response. Revisit this.
rethrow;
// TODO: Handle additional error scenarios or log them as required
} finally {
_isWaitingForAgentResponse = false;
notifyListeners();
}
}
void addTemporaryMessage(String message) {
Chat tempMessage = Chat(
// You can generate a unique ID or use a placeholder
id: "TEMP_ID",
taskId: "TEMP_ID",
message: message,
timestamp: DateTime.now(),
messageType: MessageType.user,
artifacts: []);
_chats.add(tempMessage);
notifyListeners();
}
void removeTemporaryMessage() {
_chats.removeWhere((chat) => chat.id == "TEMP_ID");
notifyListeners();
}
/// Downloads an artifact associated with a specific chat.
///
/// [taskId] is the ID of the task.
/// [artifactId] is the ID of the artifact to be downloaded.
Future<void> downloadArtifact(String taskId, String artifactId) async {
try {
// Call the downloadArtifact method from the ChatService class
await _chatService.downloadArtifact(taskId, artifactId);
print("Artifact $artifactId downloaded successfully for task $taskId!");
} catch (error) {
print("Error downloading artifact: $error");
// TODO: Handle the error appropriately, perhaps notify the user
}
}
}
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