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import json
import logging
import random
from collections.abc import Iterable
from pathlib import Path
from typing import Literal
import pyjokes
from discord import Embed
from discord.ext import commands
from discord.ext.commands import BadArgument, Cog, Context, clean_content
from bot.bot import Bot
from bot.constants import Client, Colours, Emojis
from bot.utils import helpers, messages
log = logging.getLogger(__name__)
def caesar_cipher(text: str, offset: int) -> Iterable[str]:
"""
Implements a lazy Caesar Cipher algorithm.
Encrypts a `text` given a specific integer `offset`. The sign
of the `offset` dictates the direction in which it shifts to,
with a negative value shifting to the left, and a positive
value shifting to the right.
"""
for char in text:
if not char.isascii() or not char.isalpha() or char.isspace():
yield char
continue
case_start = 65 if char.isupper() else 97
true_offset = (ord(char) - case_start + offset) % 26
yield chr(case_start + true_offset)
class Fun(Cog):
"""A collection of general commands for fun."""
def __init__(self, bot: Bot):
self.bot = bot
self._caesar_cipher_embed = json.loads(Path("bot/resources/fun/caesar_info.json").read_text("UTF-8"))
@staticmethod
def _get_random_die() -> str:
"""Generate a random die emoji, ready to be sent on Discord."""
die_name = f"dice_{random.randint(1, 6)}"
return getattr(Emojis, die_name)
@commands.command()
async def roll(self, ctx: Context, num_rolls: int = 1) -> None:
"""Outputs a number of random dice emotes (up to 6)."""
if 1 <= num_rolls <= 6:
dice = " ".join(self._get_random_die() for _ in range(num_rolls))
await ctx.send(dice)
else:
raise BadArgument(f"`{Client.prefix}roll` only supports between 1 and 6 rolls.")
@commands.command(name="randomcase", aliases=("rcase", "randomcaps", "rcaps",))
async def randomcase_command(self, ctx: Context, *, text: clean_content(fix_channel_mentions=True)) -> None:
"""Randomly converts the casing of a given `text`."""
def conversion_func(text: str) -> str:
"""Randomly converts the casing of a given string."""
return "".join(
char.upper() if round(random.random()) else char.lower() for char in text
)
text, embed = await messages.get_text_and_embed(ctx, text)
# Convert embed if it exists
if embed is not None:
embed = messages.convert_embed(conversion_func, embed)
converted_text = conversion_func(text)
converted_text = helpers.suppress_links(converted_text)
# Don't put >>> if only embed present
if converted_text:
converted_text = f">>> {converted_text.lstrip('> ')}"
await ctx.send(content=converted_text, embed=embed)
@commands.group(name="caesarcipher", aliases=("caesar", "cc",))
async def caesarcipher_group(self, ctx: Context) -> None:
"""
Translates a message using the Caesar Cipher.
See `decrypt`, `encrypt`, and `info` subcommands.
"""
if ctx.invoked_subcommand is None:
await ctx.invoke(self.bot.get_command("help"), "caesarcipher")
@caesarcipher_group.command(name="info")
async def caesarcipher_info(self, ctx: Context) -> None:
"""Information about the Caesar Cipher."""
embed = Embed.from_dict(self._caesar_cipher_embed)
embed.colour = Colours.dark_green
await ctx.send(embed=embed)
@staticmethod
async def _caesar_cipher(ctx: Context, offset: int, msg: str, left_shift: bool = False) -> None:
"""
Given a positive integer `offset`, translates and sends the given `msg`.
Performs a right shift by default unless `left_shift` is specified as `True`.
Also accepts a valid Discord Message ID or link.
"""
if offset < 0:
await ctx.send(":no_entry: Cannot use a negative offset.")
return
if left_shift:
offset = -offset
def conversion_func(text: str) -> str:
"""Encrypts the given string using the Caesar Cipher."""
return "".join(caesar_cipher(text, offset))
text, embed = await messages.get_text_and_embed(ctx, msg)
if embed is not None:
embed = messages.convert_embed(conversion_func, embed)
converted_text = conversion_func(text)
if converted_text:
converted_text = f">>> {converted_text.lstrip('> ')}"
await ctx.send(content=converted_text, embed=embed)
@caesarcipher_group.command(name="encrypt", aliases=("rightshift", "rshift", "enc",))
async def caesarcipher_encrypt(self, ctx: Context, offset: int, *, msg: str) -> None:
"""
Given a positive integer `offset`, encrypt the given `msg`.
Performs a right shift of the letters in the message.
Also accepts a valid Discord Message ID or link.
"""
await self._caesar_cipher(ctx, offset, msg, left_shift=False)
@caesarcipher_group.command(name="decrypt", aliases=("leftshift", "lshift", "dec",))
async def caesarcipher_decrypt(self, ctx: Context, offset: int, *, msg: str) -> None:
"""
Given a positive integer `offset`, decrypt the given `msg`.
Performs a left shift of the letters in the message.
Also accepts a valid Discord Message ID or link.
"""
await self._caesar_cipher(ctx, offset, msg, left_shift=True)
@commands.command()
async def joke(self, ctx: commands.Context, category: Literal["neutral", "chuck", "all"] = "all") -> None:
"""Retrieves a joke of the specified `category` from the pyjokes api."""
joke = pyjokes.get_joke(category=category)
await ctx.send(joke)
def setup(bot: Bot) -> None:
"""Load the Fun cog."""
bot.add_cog(Fun(bot))
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