#!/usr/bin/env python3.7
# coding=utf-8

from argparse import ArgumentParser
from stand_off_data import StandOffData
import hashlib
import json


def main():
    # Parse the given arguments
    parser = ArgumentParser(description='Create a vrt from JSON and txt')
    parser.add_argument('text', help='Path to txt file')
    parser.add_argument('stand_off_data', help='Path to JSON file')
    parser.add_argument('output', help='Path to vrt output file')
    args = parser.parse_args()

    with open(args.stand_off_data) as stand_of_data_file:
        stand_off_data = StandOffData(json.load(stand_of_data_file))

    with open(args.text, "rb") as text_file:
        text_md5 = hashlib.md5()
        for chunk in iter(lambda: text_file.read(128 * text_md5.block_size), b''):  # noqa
            text_md5.update(chunk)
        if text_md5.hexdigest() != stand_off_data.meta['file']['md5']:
            raise Exception('md5 not equal')

    with open(args.text, encoding=stand_off_data.meta['file']['encoding']) as text_file:
        text = text_file.read()

    with open(args.output, 'w') as vrt_file:
        vrt_file.write(stand_off_data.to_vrt(text))


if __name__ == '__main__':
    main()