"""A State Of Trance chat simulator.

2 to 3 chunks per message. Chunks can receive one effect (low proc).

Chunks:
- repeat same thing (3 to 6)
- interleave two or three things of one theme, repeat (2 to 4)
- repeat three or four things of one theme (3 to 4 each)

Effects:
- interleave a word with one thing
- just add a word somewhere

Words are actually the requester's name but it could be extended.
"""

import random
from itertools import zip_longest

from edmond.plugin import Plugin
from edmond.utils import proc


class AmbiencePlugin(Plugin):

    REQUIRED_CONFIGS = ["commands", "themes", "effect_rate", "target_word"]

    def __init__(self, bot):
        super().__init__(bot)

    @property
    def themes(self):
        return self.config["themes"]

    def on_pubmsg(self, event):
        if not self.should_handle_command(event.arguments[0]):
            return False
        target = None
        contents = self.command.content.split()
        if len(contents) >= 2 and contents[0] == self.config["target_word"]:
            target = " ".join(contents[1:])
        self.bot.say(event.target, self.get_reply(event, target=target))
        return True

    def get_reply(self, event, target=None):
        reply = ""
        num_chunks = random.randint(2, 3)
        for i in range(num_chunks):
            reply += self.get_chunk()
        if target is not None or proc(self.config["effect_rate"]):
            effect_word = (target or event.source.nick).upper()
            reply = self.apply_effect(reply, effect_word)
        return reply

    def get_chunk(self):
        return {
            1: self.repeat_same,
            2: self.interleave,
            3: self.repeat_from_theme,
        }[random.randint(1, 3)]()

    def repeat_same(self):
        random_theme_values = random.choice(list(self.themes.values()))
        random_item = random.choice(random_theme_values)
        return random_item * random.randint(3, 6)

    def interleave(self):
        random_theme_values = random.choice(list(self.themes.values()))
        sample_size = min(len(random_theme_values), random.randint(2, 4))
        random_items = "".join(random.sample(random_theme_values, sample_size))
        return random_items * random.randint(2, 4)

    def repeat_from_theme(self):
        random_theme_values = random.choice(list(self.themes.values()))
        sample_size = min(len(random_theme_values), random.randint(3, 4))
        random_items = random.sample(random_theme_values, sample_size)
        reps = random.randint(3, 4)
        return "".join(item * reps for item in random_items)

    def apply_effect(self, chunk, word):
        return {1: self.insert_word, 2: self.interleave_word,}[
            random.randint(1, 2)
        ](chunk, word)

    def insert_word(self, chunk, word):
        index = random.randint(0, len(chunk))
        return chunk[:index] + word + chunk[index:]

    def interleave_word(self, chunk, word):
        return "".join(
            a + b for a, b in zip_longest(chunk, word, fillvalue="")
        )