# Copyright 2018 vg@devys.org
# SPDX-License-Identifier: MIT

'''
Validate my contacts.

if no FILENAME or one filename is -, stdin will be used.

Usage: contacts-validation [options] [--] [FILENAME...]
       contacts-validation -h|--help|--help-format

Options:
  -h, --help     Display this help message
  --help-format  display schema fields name/title/descriptions
'''

import os
import sys

import docopt
import yaml

from . import validate_yaml_data


def gen_streams(filenames):
    for filename in filenames:
        if filename == '-':
            yield sys.stdin
        else:
            with open(filename, 'r', encoding='utf8') as stream:
                yield stream


def main():
    'function called only when script invoked directly on command line'
    args = docopt.docopt(__doc__)

    if args['--help-format']:
        print(f'for now see the schema yaml file for description')
        raise SystemExit(0)

    with open(f'{os.path.dirname(__file__)}/data/contacts_schema.yaml') as schema_fh:
        schema_obj = yaml.safe_load(schema_fh.read())
    assert schema_obj

    error_occured = False
    for i, stream in enumerate(gen_streams(args['FILENAME'] or ['-'])):
        print('#'*60, f'# Valdating stream {i}', '#'*60, sep='\n')
        yaml_data = yaml.safe_load(stream.read())
        assert yaml_data
        if not validate_yaml_data(yaml_data, schema_obj):
            error_occured = True
    if error_occured:
        raise SystemExit(1)