Normalize Phone

import json
import re

REGIONS = {'TH': {'dial': '66', 'trunk': '0', 'min': 8, 'max': 9},
           'US': {'dial': '1', 'trunk': '', 'min': 10, 'max': 10}}

def normalize_phone(value, region='TH', output='e164'):
    if value is None:
        return {'value': None, 'valid': None}
    rules = REGIONS[region]
    raw = str(value).strip()
    if re.search(r'[^\d+\-().\s ]', raw):
        return {'value': value, 'valid': False}
    digits = re.sub(r'\D', '', raw)
    if digits == '':
        return {'value': value, 'valid': False}
    if raw.startswith('+') or digits.startswith('00'):
        digits = re.sub(r'^00', '', digits)
        if not digits.startswith(rules['dial']):
            return {'value': value, 'valid': False}
        digits = digits[len(rules['dial']):]
    elif rules['trunk'] and digits.startswith(rules['trunk']):
        digits = digits[len(rules['trunk']):]
    elif digits.startswith(rules['dial']) and len(digits) > rules['max']:
        digits = digits[len(rules['dial']):]
    if not rules['min'] <= len(digits) <= rules['max']:
        return {'value': value, 'valid': False}
    if output == 'e164':
        return {'value': '+' + rules['dial'] + digits, 'valid': True}
    if output == 'national':
        return {'value': rules['trunk'] + digits, 'valid': True}
    return {'value': digits, 'valid': True}

values = ['081-234-5678', '+66 81 234 5678', '(02) 123 4567', '12345', None]
print(json.dumps([normalize_phone(v) for v in values], ensure_ascii=False))