#!/usr/bin/env python3
"""Merge multiple PDF files into one."""
import argparse, json, sys
from pathlib import Path

def merge(input_paths, output_path):
    from PyPDF2 import PdfMerger
    
    merger = PdfMerger()
    for path in input_paths:
        merger.append(path)
    
    if not output_path:
        output_path = str(Path(input_paths[0]).parent / 'merged.pdf')
    
    merger.write(output_path)
    merger.close()
    return output_path

def main():
    parser = argparse.ArgumentParser(description='Merge PDF files')
    parser.add_argument('--input', required=True, nargs='+')
    parser.add_argument('--output', required=True)
    args = parser.parse_args()
    try:
        result = merge(args.input, args.output)
        print(json.dumps({"success": True, "output": result, "message": "PDFs merged successfully"}))
    except Exception as e:
        print(json.dumps({"success": False, "output": "", "message": str(e)}))
        sys.exit(1)

if __name__ == '__main__':
    main()