#!/usr/bin/env python3
# -*- coding: utf-8 -*-

try:  # Python3
    from itertools import zip_longest
except ImportError:  # Python2
    from itertools import izip_longest as zip_longest

from itertools import tee
from xml.sax.saxutils import escape, unescape

from joblib import Parallel, delayed
from tqdm import tqdm


class CJKChars(object):
    """
    An object that enumerates the code points of the CJK characters as listed on
    http://en.wikipedia.org/wiki/Basic_Multilingual_Plane#Basic_Multilingual_Plane
    """

    # Hangul Jamo (1100–11FF)
    Hangul_Jamo = (4352, 4607)  # (ord(u"\u1100"), ord(u"\u11ff"))

    # CJK Radicals Supplement (2E80–2EFF)
    # Kangxi Radicals (2F00–2FDF)
    # Ideographic Description Characters (2FF0–2FFF)
    # CJK Symbols and Punctuation (3000–303F)
    # Hiragana (3040–309F)
    # Katakana (30A0–30FF)
    # Bopomofo (3100–312F)
    # Hangul Compatibility Jamo (3130–318F)
    # Kanbun (3190–319F)
    # Bopomofo Extended (31A0–31BF)
    # CJK Strokes (31C0–31EF)
    # Katakana Phonetic Extensions (31F0–31FF)
    # Enclosed CJK Letters and Months (3200–32FF)
    # CJK Compatibility (3300–33FF)
    # CJK Unified Ideographs Extension A (3400–4DBF)
    # Yijing Hexagram Symbols (4DC0–4DFF)
    # CJK Unified Ideographs (4E00–9FFF)
    # Yi Syllables (A000–A48F)
    # Yi Radicals (A490–A4CF)
    CJK_Radicals = (11904, 42191)  # (ord(u"\u2e80"), ord(u"\ua4cf"))

    # Phags-pa (A840–A87F)
    Phags_Pa = (43072, 43135)  # (ord(u"\ua840"), ord(u"\ua87f"))

    # Hangul Syllables (AC00–D7AF)
    Hangul_Syllables = (44032, 55215)  # (ord(u"\uAC00"), ord(u"\uD7AF"))

    # CJK Compatibility Ideographs (F900–FAFF)
    CJK_Compatibility_Ideographs = (63744, 64255)  # (ord(u"\uF900"), ord(u"\uFAFF"))

    # CJK Compatibility Forms (FE30–FE4F)
    CJK_Compatibility_Forms = (65072, 65103)  # (ord(u"\uFE30"), ord(u"\uFE4F"))

    # Range U+FF65–FFDC encodes halfwidth forms, of Katakana and Hangul characters
    Katakana_Hangul_Halfwidth = (65381, 65500)  # (ord(u"\uFF65"), ord(u"\uFFDC"))

    # Ideographic Symbols and Punctuation (16FE0–16FFF)
    Ideographic_Symbols_And_Punctuation = (
        94176,
        94207,
    )  # (ord(u"\U00016FE0"), ord(u"\U00016FFF"))

    # Tangut (17000-187FF)
    # Tangut Components (18800-18AFF)
    Tangut = (94208, 101119)  # (ord(u"\U00017000"), ord(u"\U00018AFF"))

    # Kana Supplement (1B000-1B0FF)
    # Kana Extended-A (1B100-1B12F)
    Kana_Supplement = (110592, 110895)  # (ord(u"\U0001B000"), ord(u"\U0001B12F"))

    # Nushu (1B170-1B2FF)
    Nushu = (110960, 111359)  # (ord(u"\U0001B170"), ord(u"\U0001B2FF"))

    # Supplementary Ideographic Plane (20000–2FFFF)
    Supplementary_Ideographic_Plane = (
        131072,
        196607,
    )  # (ord(u"\U00020000"), ord(u"\U0002FFFF"))

    ranges = [
        Hangul_Jamo,
        CJK_Radicals,
        Phags_Pa,
        Hangul_Syllables,
        CJK_Compatibility_Ideographs,
        CJK_Compatibility_Forms,
        Katakana_Hangul_Halfwidth,
        Tangut,
        Kana_Supplement,
        Nushu,
        Supplementary_Ideographic_Plane,
    ]


def is_cjk(character):
    """
    This checks for CJK character.

        >>> CJKChars().ranges
        [(4352, 4607), (11904, 42191), (43072, 43135), (44032, 55215), (63744, 64255), (65072, 65103), (65381, 65500), (94208, 101119), (110592, 110895), (110960, 111359), (131072, 196607)]
        >>> is_cjk(u'\u33fe')
        True
        >>> is_cjk(u'\uFE5F')
        False

    :param character: The character that needs to be checked.
    :type character: char
    :return: bool
    """
    return any(
        [
            start <= ord(character) <= end
            for start, end in [
                (4352, 4607),
                (11904, 42191),
                (43072, 43135),
                (44032, 55215),
                (63744, 64255),
                (65072, 65103),
                (65381, 65500),
                (94208, 101119),
                (110592, 110895),
                (110960, 111359),
                (131072, 196607),
            ]
        ]
    )


def xml_escape(text):
    """
    This function transforms the input text into an "escaped" version suitable
    for well-formed XML formatting.
    Note that the default xml.sax.saxutils.escape() function don't escape
    some characters that Moses does so we have to manually add them to the
    entities dictionary.

        >>> input_str = ''')| & < > ' " ] ['''
        >>> expected_output =  ''')| &amp; &lt; &gt; ' " ] ['''
        >>> escape(input_str) == expected_output
        True
        >>> xml_escape(input_str)
        ')&#124; &amp; &lt; &gt; &apos; &quot; &#93; &#91;'

    :param text: The text that needs to be escaped.
    :type text: str
    :rtype: str
    """
    return escape(
        text,
        entities={
            r"'": r"&apos;",
            r'"': r"&quot;",
            r"|": r"&#124;",
            r"[": r"&#91;",
            r"]": r"&#93;",
        },
    )


def xml_unescape(text):
    """
    This function transforms the "escaped" version suitable
    for well-formed XML formatting into humanly-readable string.
    Note that the default xml.sax.saxutils.unescape() function don't unescape
    some characters that Moses does so we have to manually add them to the
    entities dictionary.

        >>> from xml.sax.saxutils import unescape
        >>> s = ')&#124; &amp; &lt; &gt; &apos; &quot; &#93; &#91;'
        >>> expected = ''')| & < > \' " ] ['''
        >>> xml_unescape(s) == expected
        True

    :param text: The text that needs to be unescaped.
    :type text: str
    :rtype: str
    """
    return unescape(
        text,
        entities={
            r"&apos;": r"'",
            r"&quot;": r'"',
            r"&#124;": r"|",
            r"&#91;": r"[",
            r"&#93;": r"]",
        },
    )


def pairwise(iterable):
    """
    From https://docs.python.org/3/library/itertools.html#recipes
    s -> (s0,s1), (s1,s2), (s2, s3), ...
    """
    a, b = tee(iterable)
    next(b, None)
    return zip(a, b)


def grouper(iterable, n, fillvalue=None):
    """Collect data into fixed-length chunks or blocks
    from https://stackoverflow.com/a/16789869/610569
    """
    # grouper('ABCDEFG', 3, 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return zip_longest(*args, fillvalue=fillvalue)


def parallelize_preprocess(func, iterator, processes, progress_bar=False):
    iterator = tqdm(iterator) if progress_bar else iterator
    if processes <= 1:
        return map(func, iterator)
    return Parallel(n_jobs=processes)(delayed(func)(line) for line in iterator)
