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Human-in-the-Loop Session Manager
Manages review sessions for bias detection with user approval workflow
"""
import uuid
from datetime import datetime
from typing import Dict, Optional
from api.schemas import BiasReviewSession, BiasReviewItem
class HITLSessionManager:
"""
Manages in-memory sessions for human-in-the-loop bias detection workflow.
Stores session state between PDF upload, review, and final PDF generation.
"""
def __init__(self):
"""Initialize session manager with empty sessions dictionary."""
self._sessions: Dict[str, BiasReviewSession] = {}
def create_session(
self,
filename: str,
sentences: list,
raw_text: str,
pdf_bytes: bytes
) -> BiasReviewSession:
"""
Create a new review session.
Args:
filename: Original PDF filename
sentences: List of BiasReviewItem objects
raw_text: Raw extracted text from PDF
pdf_bytes: Original PDF content as bytes
Returns:
BiasReviewSession object with generated session_id
"""
session_id = str(uuid.uuid4())
session = BiasReviewSession(
session_id=session_id,
original_filename=filename,
sentences=sentences,
raw_text=raw_text,
pdf_bytes=pdf_bytes,
created_at=datetime.utcnow().isoformat(),
status="pending_review"
)
self._sessions[session_id] = session
return session
def get_session(self, session_id: str) -> Optional[BiasReviewSession]:
"""
Retrieve a session by ID.
Args:
session_id: Session identifier
Returns:
BiasReviewSession if found, None otherwise
"""
return self._sessions.get(session_id)
def update_sentence_status(
self,
session_id: str,
sentence_id: str,
status: str,
approved_suggestion: Optional[str] = None
) -> bool:
"""
Update the status of a specific sentence in a session.
Args:
session_id: Session identifier
sentence_id: Sentence identifier
status: New status ("pending", "approved", "needs_regeneration")
approved_suggestion: Approved suggestion text (if status is "approved")
Returns:
True if update successful, False otherwise
"""
session = self.get_session(session_id)
if not session:
return False
for sentence in session.sentences:
if sentence.sentence_id == sentence_id:
sentence.status = status
if approved_suggestion:
sentence.approved_suggestion = approved_suggestion
# Update session status to in_progress once first action taken
if session.status == "pending_review":
session.status = "in_progress"
return True
return False
def update_sentence_suggestion(
self,
session_id: str,
sentence_id: str,
new_suggestion: str
) -> bool:
"""
Update the suggestion for a specific sentence.
Args:
session_id: Session identifier
sentence_id: Sentence identifier
new_suggestion: New suggestion text from LLM
Returns:
True if update successful, False otherwise
"""
session = self.get_session(session_id)
if not session:
return False
for sentence in session.sentences:
if sentence.sentence_id == sentence_id:
sentence.suggestion = new_suggestion
sentence.status = "pending" # Reset to pending after regeneration
return True
return False
def get_session_stats(self, session_id: str) -> Optional[Dict]:
"""
Get statistics for a session.
Args:
session_id: Session identifier
Returns:
Dictionary with counts or None if session not found
"""
session = self.get_session(session_id)
if not session:
return None
total = len(session.sentences)
pending = sum(1 for s in session.sentences if s.status == "pending")
approved = sum(1 for s in session.sentences if s.status == "approved")
needs_regen = sum(1 for s in session.sentences if s.status == "needs_regeneration")
return {
"total_sentences": total,
"pending_count": pending,
"approved_count": approved,
"needs_regeneration_count": needs_regen
}
def is_session_ready_for_pdf(self, session_id: str) -> bool:
"""
Check if all sentences in a session have been reviewed.
Args:
session_id: Session identifier
Returns:
True if all sentences are approved, False otherwise
"""
session = self.get_session(session_id)
if not session:
return False
# Check if all sentences are either approved or were neutral
for sentence in session.sentences:
if sentence.is_biased and sentence.status != "approved":
return False
return True
def mark_session_completed(self, session_id: str) -> bool:
"""
Mark a session as completed.
Args:
session_id: Session identifier
Returns:
True if successful, False otherwise
"""
session = self.get_session(session_id)
if not session:
return False
session.status = "completed"
return True
def delete_session(self, session_id: str) -> bool:
"""
Delete a session from memory.
Args:
session_id: Session identifier
Returns:
True if deleted, False if not found
"""
if session_id in self._sessions:
del self._sessions[session_id]
return True
return False
def get_all_sessions(self) -> Dict[str, BiasReviewSession]:
"""
Get all active sessions (for debugging/monitoring).
Returns:
Dictionary of all sessions
"""
return self._sessions
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