#!/usr/bin/env python3
"""JSON validator and formatter utility.
Usage: python json_validate.py <file.json
Tests validity and outputs formatted JSON with line count.
"""
import json
import sys
from pathlib import Path

def validate_and_format(filepath: str) -> dict:
    """Validate JSON file and return formatted output."""
    path = Path(filepath)
    
    if not path.exists():
        return {"valid": False, "error": f"File not found: {filepath}", "lines": 0}
    
    try:
        with open(path, 'r') as f:
            data = json.load(f)
        formatted = json.dumps(data, indent=2, sort_keys=True)
        lines = len(formatted.split('\n'))
        return {"valid": True, "lines": lines, "content": formatted}
    except json.JSONDecodeError as e:
        return {"valid": False, "error": str(e), "lines": 0}
    except Exception as e:
        return {"valid": False, "error": str(e), "lines": 0}

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("Usage: python json_validate.py <file.json>")
        sys.exit(1)
    
    result = validate_and_format(sys.argv[1])
    
    if not result["valid"]:
        print(f"INVALID: {result['error']}")
        sys.exit(1)
    
    print(f"VALID: {result['lines']} lines")
    print(result["content"])