#!/usr/bin/env python3
"""Quick file statistics: lines, words, bytes, and unique words."""

import sys
from pathlib import Path
from collections import Counter

def quick_stats(filepath: str) -> dict:
    """Return line count, word count, byte size, and top 5 most common words."""
    path = Path(filepath)
    if not path.exists():
        return {"error": f"File not found: {filepath}"}
    
    content = path.read_text()
    lines = content.splitlines()
    words = content.split()
    
    word_counts = Counter(w.lower() for w in words if w.isalnum())
    top_words = word_counts.most_common(5)
    
    return {
        "path": filepath,
        "bytes": len(path.read_bytes()),
        "lines": len(lines),
        "words": len(words),
        "unique_words": len(word_counts),
        "top_5_words": top_words
    }

def main():
    if len(sys.argv) < 2:
        print("Usage: quick_stats.py <file1> [file2...]")
        sys.exit(1)
    
    for filepath in sys.argv[1:]:
        stats = quick_stats(filepath)
        if "error" in stats:
            print(f"ERROR: {stats['error']}")
            continue
        
        print(f"\n=== {stats['path']} ===")
        print(f"Bytes:     {stats['bytes']:,}")
        print(f"Lines:     {stats['lines']:,}")
        print(f"Words:     {stats['words']:,}")
        print(f"Unique:    {stats['unique_words']:,}")
        print(f"Top words: {stats['top_5_words']}")

if __name__ == "__main__":
    main()