feat: dahbot chat page

packages/dashbot/lib/features/chat/models/chat_models.dart

@@ -0,0 +1,134 @@
+import '../view/widgets/chat_bubble.dart';
+
+// Create a Message class that extends the existing ChatMessage for compatibility
+class Message extends ChatMessage {
+  const Message({
+    required super.id,
+    required super.content,
+    required super.role,
+    required super.timestamp,
+    required super.messageType,
+  });
+}
+
+class ChatState {
+  final Map<String, List<ChatMessage>> chatSessions; // requestId -> messages
+  final bool isGenerating;
+  final String currentStreamingResponse;
+  final String? currentRequestId;
+  final ChatFailure? lastError;
+
+  const ChatState({
+    this.chatSessions = const {},
+    this.isGenerating = false,
+    this.currentStreamingResponse = '',
+    this.currentRequestId,
+    this.lastError,
+  });
+
+  ChatState copyWith({
+    Map<String, List<ChatMessage>>? chatSessions,
+    bool? isGenerating,
+    String? currentStreamingResponse,
+    String? currentRequestId,
+    ChatFailure? lastError,
+  }) {
+    return ChatState(
+      chatSessions: chatSessions ?? this.chatSessions,
+      isGenerating: isGenerating ?? this.isGenerating,
+      currentStreamingResponse:
+          currentStreamingResponse ?? this.currentStreamingResponse,
+      currentRequestId: currentRequestId ?? this.currentRequestId,
+      lastError: lastError ?? this.lastError,
+    );
+  }
+}
+
+class ChatMessage {
+  final String id;
+  final String content;
+  final MessageRole role;
+  final DateTime timestamp;
+  final ChatMessageType? messageType;
+
+  const ChatMessage({
+    required this.id,
+    required this.content,
+    required this.role,
+    required this.timestamp,
+    this.messageType,
+  });
+
+  ChatMessage copyWith({
+    String? id,
+    String? content,
+    MessageRole? role,
+    DateTime? timestamp,
+    ChatMessageType? messageType,
+  }) {
+    return ChatMessage(
+      id: id ?? this.id,
+      content: content ?? this.content,
+      role: role ?? this.role,
+      timestamp: timestamp ?? this.timestamp,
+      messageType: messageType ?? this.messageType,
+    );
+  }
+}
+
+class ChatResponse {
+  final String content;
+  final ChatMessageType? messageType;
+
+  const ChatResponse({required this.content, this.messageType});
+
+  ChatResponse copyWith({String? content, ChatMessageType? messageType}) {
+    return ChatResponse(
+      content: content ?? this.content,
+      messageType: messageType ?? this.messageType,
+    );
+  }
+}
+
+enum ChatMessageType { explainResponse, debugError, generateTest, general }
+
+// Failure classes using fpdart Either pattern
+abstract class ChatFailure implements Exception {
+  final String message;
+  final String? code;
+  const ChatFailure(this.message, {this.code});
+
+  @override
+  String toString() => 'ChatFailure: $message';
+}
+
+class NetworkFailure extends ChatFailure {
+  const NetworkFailure(super.message, {super.code});
+}
+
+class AIModelNotConfiguredFailure extends ChatFailure {
+  const AIModelNotConfiguredFailure()
+    : super("Please configure an AI model in the AI Request tab");
+}
+
+class APIKeyMissingFailure extends ChatFailure {
+  const APIKeyMissingFailure(String provider)
+    : super("API key missing for $provider");
+}
+
+class NoRequestSelectedFailure extends ChatFailure {
+  const NoRequestSelectedFailure() : super("No request selected");
+}
+
+class InvalidRequestContextFailure extends ChatFailure {
+  const InvalidRequestContextFailure(super.message);
+}
+
+class RateLimitFailure extends ChatFailure {
+  const RateLimitFailure()
+    : super("Rate limit exceeded. Please try again later.");
+}
+
+class StreamingFailure extends ChatFailure {
+  const StreamingFailure(super.message);
+}