import unicodedata
import random

from sopel import plugin

from sopel_SpiceBot_Core_Prerun import prerun


@prerun()
@plugin.command('spongemock', 'smock')
def upper(bot, trigger, comrun):
    comrun.say(mock_case(comrun.command["trigger_str"]))


def mock_case(text):
    text = text.strip()

    out = text[0].lower()
    lower = True
    repeat = 1

    for char in text[1:]:
        lo = char.lower()
        up = char.upper()

        if unicodedata.category(char) == 'Zs' or lo == up:
            # whitespace shouldn't affect the case-repeat counting
            # nor should characters whose case cannot be transformed
            out += char
            continue

        if repeat == 2:
            repeat = 1
            lower = not lower
            out += lo if lower else up
        else:
            which = random.choice([True, False])
            if which:
                out += lo
            else:
                out += up
            if lower == which:
                repeat += 1
            else:
                repeat = 1
                lower = which

    return out