"""
Decode unicode text to an ASCII representation of the text.
Translate unicode characters to ASCII.

Inspired from John Schember's unidecode library which was created as part
of calibre.

Copyright(c) 2009, John Schember

Tranliterate the string from unicode characters to ASCII in Chinese and others.
"""
import unicodedata


__license__ = 'GPL 3'
__copyright__ = '2010, Hiroshi Miura <miurahr@linux.com>'
__docformat__ = 'restructuredtext en'
__all__ = ["Unihandecoder"]


class Unihandecoder(object):
    preferred_encoding = None
    decoder = None

    def __init__(self, lang="zh", encoding='utf-8'):
        self.preferred_encoding = encoding
        lang = lang.lower()
        if lang[:2] == 'ja':
            from ebook_converter.ebooks.unihandecode.jadecoder import Jadecoder
            self.decoder = Jadecoder()
        elif lang[:2] == 'kr' or lang == 'korean':
            from ebook_converter.ebooks.unihandecode.krdecoder import Krdecoder
            self.decoder = Krdecoder()
        elif lang[:2] == 'vn' or lang == 'vietnum':
            from ebook_converter.ebooks.unihandecode.vndecoder import Vndecoder
            self.decoder = Vndecoder()
        else:  # zh and others
            from ebook_converter.ebooks.unihandecode.unidecoder import Unidecoder
            self.decoder = Unidecoder()

    def decode(self, text):
        if isinstance(text, bytes):
            try:
                text = text.decode(self.preferred_encoding)
            except Exception:
                text = text.decode('utf-8', 'replace')
        # at first unicode normalize it. (see Unicode standards)
        ntext = unicodedata.normalize('NFKC', text)
        return self.decoder.decode(ntext)