""" formatting.py - handy functions for formatting text
"""

import re
import html.entities

from html.parser import HTMLParser

from cloudbot.util.colors import strip_irc


# Constants

IRC_COLOR_RE = re.compile(r"(\x03(\d+,\d+|\d)|[\x0f\x02\x16\x1f])")

REPLACEMENTS = {
    'a': 'ä',
    'b': 'Б',
    'c': 'ċ',
    'd': 'đ',
    'e': 'ë',
    'f': 'ƒ',
    'g': 'ġ',
    'h': 'ħ',
    'i': 'í',
    'j': 'ĵ',
    'k': 'ķ',
    'l': 'ĺ',
    'm': 'ṁ',
    'n': 'ñ',
    'o': 'ö',
    'p': 'ρ',
    'q': 'ʠ',
    'r': 'ŗ',
    's': 'š',
    't': 'ţ',
    'u': 'ü',
    'v': '',
    'w': 'ω',
    'x': 'χ',
    'y': 'ÿ',
    'z': 'ź',
    'A': 'Å',
    'B': 'Β',
    'C': 'Ç',
    'D': 'Ď',
    'E': 'Ē',
    'F': 'Ḟ',
    'G': 'Ġ',
    'H': 'Ħ',
    'I': 'Í',
    'J': 'Ĵ',
    'K': 'Ķ',
    'L': 'Ĺ',
    'M': 'Μ',
    'N': 'Ν',
    'O': 'Ö',
    'P': 'Р',
    'Q': 'Ｑ',
    'R': 'Ŗ',
    'S': 'Š',
    'T': 'Ţ',
    'U': 'Ů',
    'V': 'Ṿ',
    'W': 'Ŵ',
    'X': 'Χ',
    'Y': 'Ỳ',
    'Z': 'Ż'
}


# Classes

class HTMLTextExtractor(HTMLParser):
    """
    Takes HTML and provides cleaned and stripped text.
    """
    def __init__(self):
        HTMLParser.__init__(self)
        self.result = []

    def handle_data(self, d):
        self.result.append(d)

    def handle_charref(self, number):
        codepoint = int(number[1:], 16) if number[0] in ('x', 'X') else int(number)
        self.result.append(chr(codepoint))

    def handle_entityref(self, name):
        codepoint = html.entities.name2codepoint[name]
        self.result.append(chr(codepoint))

    def get_text(self):
        return ''.join(self.result)


# Functions

def strip_html(to_strip):
    """
    Takes HTML and returns cleaned and stripped text.
    :rtype str
    """
    s = HTMLTextExtractor()
    s.feed(to_strip)
    return s.get_text()


def munge(text, count=0):
    """
    Replaces characters in a string with visually similar characters to avoid pinging users in IRC.
    Count sets how many characters are replaced, defaulting to all characters.
    :rtype str
    """
    reps = 0
    for n in range(len(text)):
        rep = REPLACEMENTS.get(text[n])
        if rep:
            text = text[:n] + rep + text[n + 1:]
            reps += 1
            if reps == count:
                break
    return text


def multi_replace(text, word_dic):
    """
    Takes a string and replace words that match a key in a dictionary with the associated value,
    then returns the changed text
    :rtype str
    """
    rc = re.compile('|'.join(map(re.escape, word_dic)))

    def translate(match):
        return word_dic[match.group(0)]

    return rc.sub(translate, text)

# compatibility
multiword_replace = multi_replace


def truncate_words(content, length=10, suffix='...'):
    """
    Truncates a string after a certain number of words.
    :rtype str
    """
    split = content.split()
    if len(split) <= length:
        return " ".join(split[:length])
    else:
        return " ".join(split[:length]) + suffix


def truncate(content, length=100, suffix='...'):
    """
    Truncates a string after a certain number of characters.
    Function always tries to truncate on a word boundary.
    :rtype str
    """
    if len(content) <= length:
        return content
    else:
        return content[:length].rsplit(' ', 1)[0] + suffix

# compatibility
truncate_str = truncate
strip_colors = strip_irc


def pluralize(num=0, text=''):
    """
    Takes a number and a string, and pluralizes that string using the number and combines the results.
    :rtype: str
    """
    return "{:,} {}{}".format(num, text, "s"[num == 1:])


def dict_format(args, formats):
    """
    :type args: dict[unknown, unknown]
    :type formats: list[str]
    :rtype: str
    """
    matches = {}
    for f in formats:
        try:
            # Check if values can be mapped
            m = f.format(**args)
            # Insert match and number of matched values (max matched values if already in dict)
            matches[m] = max([matches.get(m, 0), len(re.findall(r'(\{.*?\})', f))])
        except:
            continue

    # Return most complete match, ranked by values matched and then my match length or None
    try:
        return max(matches.items(), key=lambda x: (x[1], len(x[0])))[0]
    except:
        return None


# ALL CODE BELOW THIS LINE IS COVERED BY THE FOLLOWING AGREEMENT:

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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
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#     documentation and/or other materials provided with the distribution.
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#     to endorse or promote products derived from this software without
#     specific prior written permission.
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split_re = re.compile(r"""((?:[^\s'"]*(?:(?:"(?:[^"\\]|\\.)*" | '(?:["""
                      r"""^'\\]|\\.)*')[^\s'"]*)+) | \S+)""", re.VERBOSE)


def smart_split(text):
    """
    Generator that splits a string by spaces, leaving quoted phrases together.
    Supports both single and double quotes, and supports escaping quotes with
    backslashes. In the output, strings will keep their initial and trailing
    quote marks and escaped quotes will remain escaped (the results can then
    be further processed with unescape_string_literal()).

    >> list(smart_split(r'This is "a person\'s" test.'))
    ['This', 'is', '"a person\\\'s"', 'test.']
    >> list(smart_split(r"Another 'person\'s' test."))
    ['Another', "'person\\'s'", 'test.']
    >> list(smart_split(r'A "\"funky\" style" test.'))
    ['A', '"\\"funky\\" style"', 'test.']
    """
    for bit in split_re.finditer(text):
        yield bit.group(0)


def get_text_list(list_, last_word='or'):
    """
    >> get_text_list(['a', 'b', 'c', 'd'])
    'a, b, c or d'
    >> get_text_list(['a', 'b', 'c'], 'and')
    'a, b and c'
    >> get_text_list(['a', 'b'], 'and')
    'a and b'
    >> get_text_list(['a'])
    'a'
    >> get_text_list([])
    ''
    """
    if len(list_) == 0:
        return ''
    if len(list_) == 1:
        return list_[0]
    return '%s %s %s' % (
        # Translators: This string is used as a separator between list elements
        ', '.join([i for i in list_][:-1]),
        last_word, list_[-1])