#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import print_function

import sys
import os.path
import json
import jsonpatch
import argparse


parser = argparse.ArgumentParser(
    description='Apply a JSON patch on a JSON file')
parser.add_argument('ORIGINAL', type=argparse.FileType('r'),
                    help='Original file')
parser.add_argument('PATCH', type=argparse.FileType('r'),
                    help='Patch file')
parser.add_argument('--indent', type=int, default=None,
                    help='Indent output by n spaces')
parser.add_argument('-v', '--version', action='version',
                    version='%(prog)s ' + jsonpatch.__version__)


def main():
    try:
        patch_files()
    except KeyboardInterrupt:
        sys.exit(1)


def patch_files():
    """ Diffs two JSON files and prints a patch """
    args = parser.parse_args()
    doc = json.load(args.ORIGINAL)
    patch = json.load(args.PATCH)
    result = jsonpatch.apply_patch(doc, patch)
    print(json.dumps(result, indent=args.indent))


if __name__ == "__main__":
    main()
