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Chat Manager Module
Handles conversation history and chat state management
"""
import logging
import json
from typing import List, Dict, Any, Optional
from datetime import datetime
from dataclasses import dataclass, asdict
from pathlib import Path
@dataclass
class ChatMessage:
"""Represents a single chat message"""
role: str # 'user' or 'assistant'
content: str
timestamp: str
metadata: Optional[Dict[str, Any]] = None
class ChatManager:
"""Manages chat history and conversation state"""
def __init__(self, max_history: int = 100):
"""
Initialize chat manager
Args:
max_history: Maximum number of messages to keep in history
"""
self.max_history = max_history
self.messages: List[ChatMessage] = []
# Configure logging
logging.basicConfig(level=logging.INFO)
self.logger = logging.getLogger(__name__)
def add_message(self, role: str, content: str, metadata: Optional[Dict[str, Any]] = None):
"""
Add a new message to the chat history
Args:
role: Message role ('user' or 'assistant')
content: Message content
metadata: Optional metadata
"""
try:
# Create message
message = ChatMessage(
role=role,
content=content,
timestamp=datetime.now().isoformat(),
metadata=metadata or {}
)
# Add to history
self.messages.append(message)
# Trim history if needed
if len(self.messages) > self.max_history:
self.messages = self.messages[-self.max_history:]
self.logger.info(f"Added {role} message to chat history")
except Exception as e:
self.logger.error(f"Error adding message: {e}")
raise
def get_messages(self, limit: Optional[int] = None) -> List[ChatMessage]:
"""
Get chat messages
Args:
limit: Maximum number of messages to return
Returns:
List of chat messages
"""
if limit is None:
return self.messages.copy()
return self.messages[-limit:]
def get_conversation_summary(self) -> str:
"""
Get a summary of the conversation
Returns:
Conversation summary
"""
if not self.messages:
return "No conversation history"
user_messages = [msg for msg in self.messages if msg.role == "user"]
assistant_messages = [msg for msg in self.messages if msg.role == "assistant"]
summary = f"Conversation Summary:\n"
summary += f"- Total messages: {len(self.messages)}\n"
summary += f"- User messages: {len(user_messages)}\n"
summary += f"- Assistant messages: {len(assistant_messages)}\n"
summary += f"- Started: {self.messages[0].timestamp}\n"
summary += f"- Last activity: {self.messages[-1].timestamp}\n"
return summary
def clear_history(self):
"""Clear all chat history"""
self.messages.clear()
self.logger.info("Chat history cleared")
def remove_message(self, index: int):
"""
Remove a specific message by index
Args:
index: Index of message to remove
"""
try:
if 0 <= index < len(self.messages):
removed = self.messages.pop(index)
self.logger.info(f"Removed message at index {index}")
return removed
else:
raise IndexError("Message index out of range")
except Exception as e:
self.logger.error(f"Error removing message: {e}")
raise
def get_context_for_rag(self, max_messages: int = 5) -> str:
"""
Get recent conversation context for RAG
Args:
max_messages: Maximum number of recent messages to include
Returns:
Formatted conversation context
"""
if not self.messages:
return ""
# Get recent messages
recent_messages = self.messages[-max_messages:]
# Format context
context_parts = []
for msg in recent_messages:
role_label = "User" if msg.role == "user" else "Assistant"
context_parts.append(f"{role_label}: {msg.content}")
return "\n".join(context_parts)
def save_conversation(self, filepath: str):
"""
Save conversation to file
Args:
filepath: Path to save the conversation
"""
try:
# Convert messages to dictionaries
messages_dict = [asdict(msg) for msg in self.messages]
# Create conversation data
conversation_data = {
"metadata": {
"created_at": datetime.now().isoformat(),
"total_messages": len(self.messages),
"max_history": self.max_history
},
"messages": messages_dict
}
# Save to file
with open(filepath, 'w', encoding='utf-8') as f:
json.dump(conversation_data, f, indent=2, ensure_ascii=False)
self.logger.info(f"Conversation saved to {filepath}")
except Exception as e:
self.logger.error(f"Error saving conversation: {e}")
raise
def load_conversation(self, filepath: str):
"""
Load conversation from file
Args:
filepath: Path to load the conversation from
"""
try:
# Load from file
with open(filepath, 'r', encoding='utf-8') as f:
conversation_data = json.load(f)
# Clear current history
self.messages.clear()
# Load messages
for msg_data in conversation_data.get("messages", []):
message = ChatMessage(
role=msg_data["role"],
content=msg_data["content"],
timestamp=msg_data["timestamp"],
metadata=msg_data.get("metadata")
)
self.messages.append(message)
self.logger.info(f"Conversation loaded from {filepath}")
except Exception as e:
self.logger.error(f"Error loading conversation: {e}")
raise
def export_conversation_text(self, filepath: str):
"""
Export conversation as plain text
Args:
filepath: Path to save the text file
"""
try:
with open(filepath, 'w', encoding='utf-8') as f:
f.write("PDFPal Conversation Export\n")
f.write("=" * 50 + "\n\n")
for msg in self.messages:
role_label = "User" if msg.role == "user" else "Assistant"
timestamp = datetime.fromisoformat(msg.timestamp).strftime("%Y-%m-%d %H:%M:%S")
f.write(f"[{timestamp}] {role_label}:\n{msg.content}\n\n")
self.logger.info(f"Conversation exported to {filepath}")
except Exception as e:
self.logger.error(f"Error exporting conversation: {e}")
raise
def get_statistics(self) -> Dict[str, Any]:
"""
Get chat statistics
Returns:
Dictionary with chat statistics
"""
if not self.messages:
return {
"total_messages": 0,
"user_messages": 0,
"assistant_messages": 0,
"avg_message_length": 0,
"conversation_duration": "0:00:00"
}
user_messages = [msg for msg in self.messages if msg.role == "user"]
assistant_messages = [msg for msg in self.messages if msg.role == "assistant"]
# Calculate average message length
total_length = sum(len(msg.content) for msg in self.messages)
avg_length = total_length / len(self.messages) if self.messages else 0
# Calculate conversation duration
start_time = datetime.fromisoformat(self.messages[0].timestamp)
end_time = datetime.fromisoformat(self.messages[-1].timestamp)
duration = end_time - start_time
return {
"total_messages": len(self.messages),
"user_messages": len(user_messages),
"assistant_messages": len(assistant_messages),
"avg_message_length": round(avg_length, 2),
"conversation_duration": str(duration),
"start_time": self.messages[0].timestamp,
"end_time": self.messages[-1].timestamp
}
def search_messages(self, query: str, case_sensitive: bool = False) -> List[ChatMessage]:
"""
Search messages by content
Args:
query: Search query
case_sensitive: Whether search should be case sensitive
Returns:
List of matching messages
"""
matching_messages = []
for msg in self.messages:
content = msg.content
if not case_sensitive:
content = content.lower()
query = query.lower()
if query in content:
matching_messages.append(msg)
return matching_messages
def get_gradio_chat_history(self) -> list:
"""
Return chat history as a list of [user, assistant] pairs for Gradio Chatbot.
Each pair is [user_message, assistant_message].
Handles cases where the conversation may start or end with a user message without a reply.
"""
pairs = []
current_pair = []
for msg in self.messages:
if msg.role == "user":
if current_pair: # If previous pair is incomplete, append it
pairs.append(current_pair)
current_pair = [msg.content, None]
elif msg.role == "assistant":
if current_pair:
current_pair[1] = msg.content
pairs.append(current_pair)
current_pair = []
if current_pair: # Handle any trailing user message
pairs.append(current_pair)
return pairs |