import re
from iottb import definitions
import logging

logger = logging.getLogger(__name__)


def normalize_string(s, chars_to_replace=None, replacement=None, allow_unicode=False):
    pass


def make_canonical_name(name):
    """
    Normalize the device name to a canonical form:
    - Replace the first two occurrences of spaces
    - transform characters with dashes.
    - Remove remaining spaces.
    - Convert to lowercase.
    """
    aliases = [name]
    # We first normalize
    chars_to_replace = definitions.REPLACEMENT_SET_CANONICAL_DEVICE_NAMES
    pattern = re.compile('|'.join(re.escape(char) for char in chars_to_replace))
    norm_name = pattern.sub('-', name)
    # Remove non ascii chars
    norm_name = re.sub(r'[^\x00-\x7F]+', '', norm_name) 

    aliases.append(norm_name)
    # Lower case
    norm_name = norm_name.lower()
    aliases.append(norm_name)
    # canoncial name is only first two tokens
    parts = norm_name.split('-')
    canonical_name = canonical_name = '-'.join(parts[:2])
    aliases.append(canonical_name)
    aliases = list(set(aliases))
    return canonical_name, aliases