#!/usr/bin/env python
# coding: utf-8
"""
Paranoid text spacing for good readability, to automatically insert whitespace between CJK (Chinese, Japanese, Korean) and half-width characters (alphabetical letters, numerical digits and symbols).

>>> import pangu
>>> nwe_text = pangu.spacing_text('當你凝視著bug，bug也凝視著你')
>>> print(nwe_text)
'當你凝視著 bug，bug 也凝視著你'
>>> nwe_content = pangu.spacing_file('path/to/file.txt')
>>> print(nwe_content)
'與 PM 戰鬥的人，應當小心自己不要成為 PM'
"""

import argparse
import os
import re
import sys

__version__ = '4.0.6.1'
__all__ = ['spacing_text', 'spacing_file', 'spacing', 'cli']

CJK = r'\u2e80-\u2eff\u2f00-\u2fdf\u3040-\u309f\u30a0-\u30fa\u30fc-\u30ff\u3100-\u312f\u3200-\u32ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff'

ANY_CJK = re.compile(r'[{CJK}]'.format(CJK=CJK))

CONVERT_TO_FULLWIDTH_CJK_SYMBOLS_CJK = re.compile('([{CJK}])([ ]*(?:[\\:]+|\\.)[ ]*)([{CJK}])'.format(CJK=CJK))  # there is an extra non-capturing group compared to JavaScript version
CONVERT_TO_FULLWIDTH_CJK_SYMBOLS = re.compile('([{CJK}])[ ]*([~\\!;,\\?]+)[ ]*'.format(CJK=CJK))
DOTS_CJK = re.compile('([\\.]{{2,}}|\u2026)([{CJK}])'.format(CJK=CJK))  # need to escape { }
FIX_CJK_COLON_ANS = re.compile('([{CJK}])\\:([A-Z0-9\\(\\)])'.format(CJK=CJK))

CJK_QUOTE = re.compile('([{CJK}])([`"\u05f4])'.format(CJK=CJK))  # no need to escape `
QUOTE_CJK = re.compile('([`"\u05f4])([{CJK}])'.format(CJK=CJK))  # no need to escape `
FIX_QUOTE_ANY_QUOTE = re.compile(r'([`"\u05f4]+)(\s*)(.+?)(\s*)([`"\u05f4]+)')

CJK_SINGLE_QUOTE_BUT_POSSESSIVE = re.compile("([{CJK}])('[^s])".format(CJK=CJK))
SINGLE_QUOTE_CJK = re.compile("(')([{CJK}])".format(CJK=CJK))
FIX_POSSESSIVE_SINGLE_QUOTE = re.compile("([{CJK}A-Za-z0-9])( )('s)".format(CJK=CJK))

HASH_ANS_CJK_HASH = re.compile('([{CJK}])(#)([{CJK}]+)(#)([{CJK}])'.format(CJK=CJK))
CJK_HASH = re.compile('([{CJK}])(#([^ ]))'.format(CJK=CJK))
HASH_CJK = re.compile('(([^ ])#)([{CJK}])'.format(CJK=CJK))

CJK_OPERATOR_ANS = re.compile('([{CJK}])([\\+\\-\\*\\/=&\\|<>])([A-Za-z0-9])'.format(CJK=CJK))
ANS_OPERATOR_CJK = re.compile('([A-Za-z0-9])([\\+\\-\\*\\/=&\\|<>])([{CJK}])'.format(CJK=CJK))

FIX_SLASH_AS = re.compile(r'([/]) ([a-z\-_\./]+)')
FIX_SLASH_AS_SLASH = re.compile(r'([/\.])([A-Za-z\-_\./]+) ([/])')

CJK_LEFT_BRACKET = re.compile('([{CJK}])([\\(\\[\\{{<>\u201c])'.format(CJK=CJK))  # need to escape {
RIGHT_BRACKET_CJK = re.compile('([\\)\\]\\}}<>\u201d])([{CJK}])'.format(CJK=CJK))  # need to escape }
FIX_LEFT_BRACKET_ANY_RIGHT_BRACKET = re.compile(r'([\(\[\{<\u201c]+)(\s*)(.+?)(\s*)([\)\]\}>\u201d]+)')  # need to escape { }
ANS_CJK_LEFT_BRACKET_ANY_RIGHT_BRACKET = re.compile('([A-Za-z0-9{CJK}])[ ]*([\u201c])([A-Za-z0-9{CJK}\\-_ ]+)([\u201d])'.format(CJK=CJK))
LEFT_BRACKET_ANY_RIGHT_BRACKET_ANS_CJK = re.compile('([\u201c])([A-Za-z0-9{CJK}\\-_ ]+)([\u201d])[ ]*([A-Za-z0-9{CJK}])'.format(CJK=CJK))

AN_LEFT_BRACKET = re.compile(r'([A-Za-z0-9])([\(\[\{])')
RIGHT_BRACKET_AN = re.compile(r'([\)\]\}])([A-Za-z0-9])')

CJK_ANS = re.compile('([{CJK}])([A-Za-z\u0370-\u03ff0-9@\\$%\\^&\\*\\-\\+\\\\=\\|/\u00a1-\u00ff\u2150-\u218f\u2700—\u27bf])'.format(CJK=CJK))
ANS_CJK = re.compile('([A-Za-z\u0370-\u03ff0-9~\\!\\$%\\^&\\*\\-\\+\\\\=\\|;:,\\./\\?\u00a1-\u00ff\u2150-\u218f\u2700—\u27bf])([{CJK}])'.format(CJK=CJK))

S_A = re.compile(r'(%)([A-Za-z])')

MIDDLE_DOT = re.compile(r'([ ]*)([\u00b7\u2022\u2027])([ ]*)')

# Python version only
TILDES = re.compile(r'~+')
EXCLAMATION_MARKS = re.compile(r'!+')
SEMICOLONS = re.compile(r';+')
COLONS = re.compile(r':+')
COMMAS = re.compile(r',+')
PERIODS = re.compile(r'\.+')
QUESTION_MARKS = re.compile(r'\?+')


def convert_to_fullwidth(symbols):
    symbols = TILDES.sub('～', symbols)
    symbols = EXCLAMATION_MARKS.sub('！', symbols)
    symbols = SEMICOLONS.sub('；', symbols)
    symbols = COLONS.sub('：', symbols)
    symbols = COMMAS.sub('，', symbols)
    symbols = PERIODS.sub('。', symbols)
    symbols = QUESTION_MARKS.sub('？', symbols)
    return symbols.strip()


def spacing(text):
    """
    Perform paranoid text spacing on text.
    """
    if len(text) <= 1 or not ANY_CJK.search(text):
        return text

    new_text = text

    # TODO: refactoring
    matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS_CJK.search(new_text)
    while matched:
        start, end = matched.span()
        new_text = ''.join((new_text[:start + 1], convert_to_fullwidth(new_text[start + 1:end - 1]), new_text[end - 1:]))
        matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS_CJK.search(new_text)

    matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS.search(new_text)
    while matched:
        start, end = matched.span()
        new_text = ''.join((new_text[:start + 1].strip(), convert_to_fullwidth(new_text[start + 1:end]), new_text[end:].strip()))
        matched = CONVERT_TO_FULLWIDTH_CJK_SYMBOLS.search(new_text)

    new_text = DOTS_CJK.sub(r'\1 \2', new_text)
    new_text = FIX_CJK_COLON_ANS.sub(r'\1：\2', new_text)

    new_text = CJK_QUOTE.sub(r'\1 \2', new_text)
    new_text = QUOTE_CJK.sub(r'\1 \2', new_text)
    new_text = FIX_QUOTE_ANY_QUOTE.sub(r'\1\3\5', new_text)

    new_text = CJK_SINGLE_QUOTE_BUT_POSSESSIVE.sub(r'\1 \2', new_text)
    new_text = SINGLE_QUOTE_CJK.sub(r'\1 \2', new_text)
    new_text = FIX_POSSESSIVE_SINGLE_QUOTE.sub(r"\1's", new_text)

    new_text = HASH_ANS_CJK_HASH.sub(r'\1 \2\3\4 \5', new_text)
    new_text = CJK_HASH.sub(r'\1 \2', new_text)
    new_text = HASH_CJK.sub(r'\1 \3', new_text)

    new_text = CJK_OPERATOR_ANS.sub(r'\1 \2 \3', new_text)
    new_text = ANS_OPERATOR_CJK.sub(r'\1 \2 \3', new_text)

    new_text = FIX_SLASH_AS.sub(r'\1\2', new_text)
    new_text = FIX_SLASH_AS_SLASH.sub(r'\1\2\3', new_text)

    new_text = CJK_LEFT_BRACKET.sub(r'\1 \2', new_text)
    new_text = RIGHT_BRACKET_CJK.sub(r'\1 \2', new_text)
    new_text = FIX_LEFT_BRACKET_ANY_RIGHT_BRACKET.sub(r'\1\3\5', new_text)
    new_text = ANS_CJK_LEFT_BRACKET_ANY_RIGHT_BRACKET.sub(r'\1 \2\3\4', new_text)
    new_text = LEFT_BRACKET_ANY_RIGHT_BRACKET_ANS_CJK.sub(r'\1\2\3 \4', new_text)

    new_text = AN_LEFT_BRACKET.sub(r'\1 \2', new_text)
    new_text = RIGHT_BRACKET_AN.sub(r'\1 \2', new_text)

    new_text = CJK_ANS.sub(r'\1 \2', new_text)
    new_text = ANS_CJK.sub(r'\1 \2', new_text)

    new_text = S_A.sub(r'\1 \2', new_text)

    new_text = MIDDLE_DOT.sub('・', new_text)

    return new_text.strip()


def spacing_text(text):
    """
    Perform paranoid text spacing on text. An alias of `spacing()`.
    """
    return spacing(text)


def spacing_file(path):
    """
    Perform paranoid text spacing from file.
    """
    # TODO: read line by line
    with open(os.path.abspath(path)) as f:
        return spacing_text(f.read())


def cli(args=None):
    if not args:
        args = sys.argv[1:]

    parser = argparse.ArgumentParser(
        prog='pangu',
        description='pangu.py -- Paranoid text spacing for good readability, to automatically insert whitespace between CJK and half-width characters (alphabetical letters, numerical digits and symbols).',
    )
    parser.add_argument('-v', '--version', action='version', version=__version__)
    parser.add_argument('-t', '--text', action='store_true', dest='is_text', required=False, help='specify the input value is a text')
    parser.add_argument('-f', '--file', action='store_true', dest='is_file', required=False, help='specify the input value is a file path')
    parser.add_argument('text_or_path', action='store', type=str, help='the text or file path to apply spacing')

    if not sys.stdin.isatty():
        print(spacing_text(sys.stdin.read()))  # noqa: T003
    else:
        args = parser.parse_args(args)
        if args.is_text:
            print(spacing_text(args.text_or_path))  # noqa: T003
        elif args.is_file:
            print(spacing_file(args.text_or_path))  # noqa: T003
        else:
            print(spacing_text(args.text_or_path))  # noqa: T003


if __name__ == '__main__':
    cli()