#!/usr/bin/env python3
"""JSON minifier: removes all unnecessary whitespace from JSON files.

Usage: json-minify.py <input.json> [output.json]
If output not specified, writes to stdout.
"""

import json
import sys
from pathlib import Path


def minify_json(input_path: str, output_path: str | None = None) -> None:
    """Read JSON, minify it, and write result."""
    with open(input_path, 'r', encoding='utf-8') as f:
        data = json.load(f)
    
    minified = json.dumps(data, separators=(',', ':'), ensure_ascii=False)
    
    if output_path:
        Path(output_path).write_text(minified + '\n', encoding='utf-8')
        print(f"Minified {input_path} -> {output_path}", file=sys.stderr)
    else:
        print(minified)


if __name__ == '__main__':
    if len(sys.argv) < 2:
        print(__doc__, file=sys.stderr)
        sys.exit(1)
    
    input_file = sys.argv[1]
    output_file = sys.argv[2] if len(sys.argv) > 2 else None
    
    minify_json(input_file, output_file)