#!/usr/bin/env python

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

valid_c_name_pattern = re.compile('[\W_]+')


def parse_event(e):
    e['name'] = valid_c_name_pattern.sub('_', e['name']).lower()
    if e.get('filter') is None:
        e.setdefault('filter', {}).setdefault('type', 'none')
    if e.get('action') is None:
        e.setdefault('action', {}).setdefault('type', 'noop')
    return e

if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description='Phosphor Inventory Manager (PIM) YAML '
        'scanner and code generator.')
    parser.add_argument(
        '-o', '--output', dest='output',
        default='generated.cpp', help='Output file name.')
    parser.add_argument(
        '-d', '--dir', dest='inputdir',
        default='example',
        help='Location of files to process.')
    parser.add_argument(
        '-t', '--template', dest='template',
        default='generated.mako.cpp',
        help='Location of mako template.')

    args = parser.parse_args()

    events_dir = os.path.join(args.inputdir, 'events')
    yaml_files = filter(
        lambda x: x.endswith('.yaml'),
        os.listdir(events_dir))

    events = []
    for x in yaml_files:
        with open(os.path.join(events_dir, x), 'r') as fd:
            for e in yaml.load(fd.read()).get('events', {}):
                events.append(parse_event(e))

    t = Template(filename=args.template)
    with open(os.path.join(args.inputdir, 'interfaces.yaml'), 'r') as fd:
        interfaces = yaml.load(fd.read())

    with open(args.output, 'w') as fd:
        fd.write(
            t.render(
                interfaces=interfaces,
                events=events))


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