#!/usr/bin/env python

import argparse
import json
import sys
import jsonschema

r"""
Validates the phosphor-regulators configuration file. Checks it against a JSON
schema as well as doing some extra checks that can't be encoded in the schema.
"""

def validate_schema(config, schema):
    r"""
    Validates the specified config file using the specified
    schema file.

    config:   Path of the file containing the config JSON
    schema:   Path of the file containing the schema JSON
    """

    with open(config) as config_handle:
        config_json = json.load(config_handle)

        with open(schema) as schema_handle:
            schema_json = json.load(schema_handle)

            try:
                jsonschema.validate(config_json, schema_json)
            except jsonschema.ValidationError as e:
                print(e)
                sys.exit("Validation failed.")

if __name__ == '__main__':

    parser = argparse.ArgumentParser(
        description='phosphor-regulators configuration file validator')

    parser.add_argument('-s', '--schema-file', dest='schema_file',
                        help='The phosphor-regulators schema file')

    parser.add_argument('-c', '--configuration-file', dest='configuration_file',
                        help='The phosphor-regulators configuration file')

    args = parser.parse_args()

    if not args.schema_file:
        parser.print_help()
        sys.exit("Error: Schema file is required.")
    if not args.configuration_file:
        parser.print_help()
        sys.exit("Error: Configuration file is required.")

    validate_schema(args.configuration_file, args.schema_file)