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#!/usr/bin/env python3

import os
import re
import shutil
from collections import defaultdict
from pathlib import Path

def copy_middle_segments():
    source_dir = Path("edited_segmented_images")
    target_dir = Path("middle_segments")
    
    # Create target directory if it doesn't exist
    target_dir.mkdir(exist_ok=True)
    
    # Group images by page_id
    page_segments = defaultdict(list)
    
    # Pattern to extract page_id and segment number
    pattern = re.compile(r'page_(\d+)_segment_(\d+)\.png')
    
    # Collect all image files and group by page
    for file in source_dir.glob("*.png"):
        match = pattern.search(file.name)
        if match:
            page_id = match.group(1)
            segment_num = int(match.group(2))
            page_segments[page_id].append((segment_num, file.name))
    
    # Process each page
    total_copied = 0
    for page_id, segments in page_segments.items():
        if len(segments) <= 2:
            # If there are only 2 or fewer segments, skip (no middle segments)
            print(f"Page {page_id}: Only {len(segments)} segments, skipping")
            continue
        
        # Sort segments by segment number
        segments.sort(key=lambda x: x[0])
        
        min_segment = segments[0][0]
        max_segment = segments[-1][0]
        
        print(f"Page {page_id}: segments {min_segment} to {max_segment}, copying middle segments...")
        
        # Copy middle segments
        for segment_num, filename in segments[1:-1]:  # Exclude first and last
            source_path = source_dir / filename
            target_path = target_dir / filename
            shutil.copy2(source_path, target_path)
            total_copied += 1
            print(f"  Copied: {filename}")
    
    print(f"\nTotal files copied: {total_copied}")
    print(f"Files saved to: {target_dir.absolute()}")

if __name__ == "__main__":
    copy_middle_segments()