import re
from .cmudict import CMUDict

_letter_to_arpabet = {
    'A': 'EY1',
    'B': 'B IY1',
    'C': 'S IY1',
    'D': 'D IY1',
    'E': 'IY1',
    'F': 'EH1 F',
    'G': 'JH IY1',
    'H': 'EY1 CH',
    'I': 'AY1',
    'J': 'JH EY1',
    'K': 'K EY1',
    'L': 'EH1 L',
    'M': 'EH1 M',
    'N': 'EH1 N',
    'O': 'OW1',
    'P': 'P IY1',
    'Q': 'K Y UW1',
    'R': 'AA1 R',
    'S': 'EH1 S',
    'T': 'T IY1',
    'U': 'Y UW1',
    'V': 'V IY1',
    'X': 'EH1 K S',
    'Y': 'W AY1',
    'W': 'D AH1 B AH0 L Y UW0',
    'Z': 'Z IY1',
    's': 'Z'
}

# must ignore roman numerals
# _acronym_re = re.compile(r'([A-Z][A-Z]+)s?|([A-Z]\.([A-Z]\.)+s?)')
_acronym_re = re.compile(r'([A-Z][A-Z]+)s?')

class AcronymNormalizer(object):
    def __init__(self, phoneme_dict):
        self.phoneme_dict = phoneme_dict

    def normalize_acronyms(self, text):
        def _expand_acronyms(m, add_spaces=True):
            acronym = m.group(0)
            # remove dots if they exist
            acronym = re.sub('\.', '', acronym)

            acronym = "".join(acronym.split())
            arpabet = self.phoneme_dict.lookup(acronym)

            if arpabet is None:
                acronym = list(acronym)
                arpabet = ["{" + _letter_to_arpabet[letter] + "}" for letter in acronym]
                # temporary fix
                if arpabet[-1] == '{Z}' and len(arpabet) > 1:
                    arpabet[-2] = arpabet[-2][:-1] + ' ' + arpabet[-1][1:]
                    del arpabet[-1]
                arpabet = ' '.join(arpabet)
            elif len(arpabet) == 1:
                arpabet = "{" + arpabet[0] + "}"
            else:
                arpabet = acronym
            return arpabet
        text = re.sub(_acronym_re, _expand_acronyms, text)
        return text

    def __call__(self, text):
        return self.normalize_acronyms(text)
