"""Explicit one-time migration; runtime never reads the monitor configuration."""
import argparse
import configparser
from pathlib import Path
from settings import SCHEMA,load,validated,check,save


def migrate(source):
    c=configparser.ConfigParser()
    if not c.read(source):raise ValueError('monitor config missing')
    result={s:{k:v['default'] for k,v in spec.items()} for s,spec in SCHEMA.items()}
    for section,old in (('fan','fan'),('rgb','led')):
        if c.has_section(old):
            values={k:v for k,v in c.items(old) if k in SCHEMA[section]}
            result[section].update(validated({section:values})[section])
    for old,key in (('oled_refresh_interval','refresh_seconds'),('page_interval','page_seconds')):
        if c.has_option('timing',old):result['oled'].update(validated({'oled':{key:c.get('timing',old)}})['oled'])
    check(result)
    return result

if __name__=='__main__':
    p=argparse.ArgumentParser();p.add_argument('source');p.add_argument('--check',action='store_true');p.add_argument('--output');a=p.parse_args()
    result=migrate(a.source)
    if a.output:save(a.output,result)
    else:print('migration valid; no files changed')