#!/usr/bin/env python

import os
import sys
import yaml
from argparse import ArgumentParser
from mako.template import Template


def generate(yaml_file, output_file):
    with open(yaml_file, 'r') as yaml_input:
        yaml_data = yaml.safe_load(yaml_input) or {}

    with open(output_file, 'w') as gen_out:
        gen_out.write(Template(filename='generated.mako.cpp').render(
            events=yaml_data))


if __name__ == '__main__':
    parser = ArgumentParser()
    # Groups of items and how they should be monitored yaml file
    parser.add_argument(
        "-y", "--yaml", dest="input_yaml",
        default="example/monitoring_defs.yaml",
        help="Input item monitoring definition yaml to parse")
    parser.add_argument(
        "-o", "--outdir", dest="output_dir",
        default=os.path.abspath('.'),
        help="Output directory for source files generated")
    args = parser.parse_args(sys.argv[1:])

    yaml_file = os.path.abspath(args.input_yaml)
    generate(yaml_file, os.path.join(args.output_dir, "generated.cpp"))