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"""
User Progress Management Utilities
Handles tracking and resuming review progress for Phase 2 reviewers
"""

from datetime import datetime
from sqlalchemy.orm import Session
from sqlalchemy import func, and_

from data.models import UserProgress, Annotation, Annotator, Validation
from utils.logger import get_logger

log = get_logger(__name__)


def get_user_progress(db: Session, user_id: int, target_annotator_id: int) -> UserProgress:
    """Get or create a progress record for the user reviewing the target annotator"""
    progress = db.query(UserProgress).filter(
        and_(
            UserProgress.user_id == user_id,
            UserProgress.target_annotator_id == target_annotator_id
        )
    ).first()
    
    if not progress:
        # Create new progress record
        progress = UserProgress(
            user_id=user_id,
            target_annotator_id=target_annotator_id,
            last_reviewed_annotation_id=None,
            last_position=0,
            updated_at=datetime.now()
        )
        db.add(progress)
        db.commit()
        log.info(f"Created new progress record for user {user_id} reviewing annotator {target_annotator_id}")
    
    return progress


def update_user_progress(db: Session, user_id: int, target_annotator_id: int, annotation_id: int, position: int):
    """Update user progress after they review an annotation"""
    progress = get_user_progress(db, user_id, target_annotator_id)
    
    progress.last_reviewed_annotation_id = annotation_id
    progress.last_position = position
    progress.updated_at = datetime.now()
    
    db.commit()
    log.info(f"Updated progress for user {user_id}: annotation {annotation_id} at position {position}")


def get_next_unreviewed_annotation(db: Session, user_id: int, target_annotator_id: int):
    """Find the next annotation that needs to be reviewed by this user"""
    
    # Get all annotations for the target annotator that haven't been reviewed by this user
    unreviewed_query = db.query(Annotation).filter(
        Annotation.annotator_id == target_annotator_id
    ).outerjoin(
        Validation, 
        and_(
            Validation.annotation_id == Annotation.id,
            Validation.validator_id == user_id
        )
    ).filter(
        Validation.id.is_(None)  # No validation record means not reviewed
    ).order_by(Annotation.id)
    
    first_unreviewed = unreviewed_query.first()
    
    if first_unreviewed:
        # Calculate the position of this annotation in the full list
        position = db.query(Annotation).filter(
            and_(
                Annotation.annotator_id == target_annotator_id,
                Annotation.id <= first_unreviewed.id
            )
        ).count() - 1  # Convert to 0-based index
        
        return first_unreviewed.id, position
    else:
        # All annotations have been reviewed, return the last position
        total_count = db.query(Annotation).filter(
            Annotation.annotator_id == target_annotator_id
        ).count()
        
        return None, max(0, total_count - 1)


def get_last_reviewed_position(db: Session, user_id: int, target_annotator_id: int) -> int:
    """Get the last position this user reviewed"""
    progress = get_user_progress(db, user_id, target_annotator_id)
    return progress.last_position


def get_annotations_from_position(db: Session, target_annotator_id: int, start_position: int, batch_size: int = 10):
    """Load annotations starting from a specific position"""
    
    annotations_query = db.query(
        Annotation
    ).join(
        Annotation.tts_data
    ).filter(
        Annotation.annotator_id == target_annotator_id
    ).order_by(Annotation.id).offset(start_position).limit(batch_size)
    
    return annotations_query.all()


def get_review_summary(db: Session, user_id: int, target_annotator_id: int):
    """Get a summary of review progress"""
    
    # Total annotations for target annotator
    total_count = db.query(Annotation).filter(
        Annotation.annotator_id == target_annotator_id
    ).count()
    
    # Reviewed count by this user
    reviewed_count = db.query(Annotation).join(
        Validation, Annotation.id == Validation.annotation_id
    ).filter(
        and_(
            Annotation.annotator_id == target_annotator_id,
            Validation.validator_id == user_id
        )
    ).count()
    
    # Approved count
    approved_count = db.query(Annotation).join(
        Validation, Annotation.id == Validation.annotation_id
    ).filter(
        and_(
            Annotation.annotator_id == target_annotator_id,
            Validation.validator_id == user_id,
            Validation.validated == True
        )
    ).count()
    
    # Rejected count
    rejected_count = reviewed_count - approved_count
    
    return {
        "total": total_count,
        "reviewed": reviewed_count,
        "approved": approved_count,
        "rejected": rejected_count,
        "remaining": total_count - reviewed_count,
        "progress_percentage": (reviewed_count / total_count * 100) if total_count > 0 else 0
    }