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"""
Session Service - Chat session management
"""
import json
import uuid
from datetime import datetime
from pathlib import Path
from typing import Dict, List, Optional
from core.config import SESSIONS_DIR
from core.state import get_state
from core.logger import logger
class SessionService:
"""
Manages chat sessions.
Sessions are stored in state + individual files for messages.
"""
def __init__(self):
self._state = get_state()
# ══════════════════════════════════════════════════════════════════
# SESSION CRUD
# ══════════════════════════════════════════════════════════════════
def create_session(
self,
title: str = "",
session_type: str = "chat",
system_prompt: str = ""
) -> Dict:
"""Create a new chat session"""
session_id = str(uuid.uuid4())[:8]
if not title:
now = datetime.now()
prefix = "Chat" if session_type == "chat" else "Roleplay"
title = f"{prefix} {now.strftime('%m/%d %H:%M')}"
session = {
"id": session_id,
"title": title,
"type": session_type,
"system_prompt": system_prompt,
"created_at": datetime.now().isoformat(),
"updated_at": datetime.now().isoformat(),
"message_count": 0,
"model_id": self._state.get_loaded_model_id()
}
# Save session metadata to state
self._state.add_session(session)
# Create empty messages file
self._save_messages(session_id, [])
logger.event("Sessions", f"Created: {session_id}", {"title": title})
return session
def get_session(self, session_id: str) -> Optional[Dict]:
"""Get session by ID with messages"""
sessions = self._state.get_sessions()
for s in sessions:
if s["id"] == session_id:
session = s.copy()
session["messages"] = self._load_messages(session_id)
return session
return None
def get_all_sessions(self) -> List[Dict]:
"""Get all sessions (without messages)"""
return self._state.get_sessions()
def update_session(self, session_id: str, updates: Dict) -> bool:
"""Update session metadata"""
return self._state.update_session(session_id, updates)
def delete_session(self, session_id: str) -> bool:
"""Delete session and its messages"""
# Delete messages file
msg_file = SESSIONS_DIR / f"{session_id}.json"
if msg_file.exists():
msg_file.unlink()
# Remove from state
result = self._state.delete_session(session_id)
if result:
logger.event("Sessions", f"Deleted: {session_id}")
return result
def rename_session(self, session_id: str, new_title: str) -> bool:
"""Rename a session"""
return self._state.update_session(session_id, {"title": new_title})
def clear_session(self, session_id: str) -> bool:
"""Clear all messages from a session"""
self._save_messages(session_id, [])
self._state.update_session(session_id, {"message_count": 0})
return True
# ══════════════════════════════════════════════════════════════════
# MESSAGE HANDLING
# ══════════════════════════════════════════════════════════════════
def add_message(self, session_id: str, role: str, content: str) -> bool:
"""Add a message to session"""
messages = self._load_messages(session_id)
message = {
"role": role,
"content": content,
"timestamp": datetime.now().isoformat()
}
messages.append(message)
self._save_messages(session_id, messages)
# Update session metadata
self._state.update_session(session_id, {
"message_count": len(messages)
})
# Auto-generate title from first user message
if role == "user" and len(messages) == 1:
title = content[:40] + "..." if len(content) > 40 else content
self._state.update_session(session_id, {"title": title})
return True
def get_messages(self, session_id: str) -> List[Dict]:
"""Get all messages for a session"""
return self._load_messages(session_id)
def _load_messages(self, session_id: str) -> List[Dict]:
"""Load messages from file"""
msg_file = SESSIONS_DIR / f"{session_id}.json"
if msg_file.exists():
try:
return json.loads(msg_file.read_text())
except:
pass
return []
def _save_messages(self, session_id: str, messages: List[Dict]):
"""Save messages to file"""
msg_file = SESSIONS_DIR / f"{session_id}.json"
msg_file.write_text(json.dumps(messages, indent=2))
# ══════════════════════════════════════════════════════════════════
# UTILITY
# ══════════════════════════════════════════════════════════════════
def get_active_session(self) -> Optional[Dict]:
"""Get the currently active session"""
session_id = self._state.get_active_session_id()
if session_id:
return self.get_session(session_id)
return None
def set_active_session(self, session_id: str):
"""Set active session"""
self._state.set_active_session(session_id)
def get_session_for_display(self, session_id: str) -> Optional[Dict]:
"""Get session formatted for UI display"""
session = self.get_session(session_id)
if not session:
return None
# Format messages for Gradio chatbot (tuple format)
history = []
user_msg = None
for msg in session.get("messages", []):
if msg["role"] == "user":
user_msg = msg["content"]
elif msg["role"] == "assistant" and user_msg:
history.append((user_msg, msg["content"]))
user_msg = None
if user_msg:
history.append((user_msg, None))
return {
"id": session["id"],
"title": session["title"],
"type": session["type"],
"system_prompt": session["system_prompt"],
"history": history,
"message_count": session["message_count"]
}
def group_sessions_by_date(self) -> Dict[str, List[Dict]]:
"""Group sessions by date for sidebar display"""
sessions = self.get_all_sessions()
today = datetime.now().date()
groups = {
"Today": [],
"Yesterday": [],
"This Week": [],
"Older": []
}
for s in sessions:
try:
updated = datetime.fromisoformat(s["updated_at"]).date()
diff = (today - updated).days
if diff == 0:
groups["Today"].append(s)
elif diff == 1:
groups["Yesterday"].append(s)
elif diff < 7:
groups["This Week"].append(s)
else:
groups["Older"].append(s)
except:
groups["Older"].append(s)
# Remove empty groups
return {k: v for k, v in groups.items() if v}
# Singleton
_session_service: Optional[SessionService] = None
def get_session_service() -> SessionService:
"""Get singleton session service"""
global _session_service
if _session_service is None:
_session_service = SessionService()
return _session_service
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