1 files changed, 89 insertions, 0 deletions
diff --git a/bot/exts/evergreen/xkcd.py b/bot/exts/evergreen/xkcd.py
new file mode 100644
index 00000000..d3224bfe
--- /dev/null
+++ b/bot/exts/evergreen/xkcd.py
@@ -0,0 +1,89 @@
+import logging
+import re
+from random import randint
+from typing import Dict, Optional, Union
+
+from discord import Embed
+from discord.ext import tasks
+from discord.ext.commands import Cog, Context, command
+
+from bot.bot import Bot
+from bot.constants import Colours
+
+log = logging.getLogger(__name__)
+
+COMIC_FORMAT = re.compile(r"latest|[0-9]+")
+BASE_URL = "https://xkcd.com"
+
+
+class XKCD(Cog):
+    """Retrieving XKCD comics."""
+
+    def __init__(self, bot: Bot) -> None:
+        self.bot = bot
+        self.latest_comic_info: Dict[str, Union[str, int]] = {}
+        self.get_latest_comic_info.start()
+
+    def cog_unload(self) -> None:
+        """Cancels refreshing of the task for refreshing the most recent comic info."""
+        self.get_latest_comic_info.cancel()
+
+    @tasks.loop(minutes=30)
+    async def get_latest_comic_info(self) -> None:
+        """Refreshes latest comic's information ever 30 minutes. Also used for finding a random comic."""
+        async with self.bot.http_session.get(f"{BASE_URL}/info.0.json") as resp:
+            if resp.status == 200:
+                self.latest_comic_info = await resp.json()
+            else:
+                log.debug(f"Failed to get latest XKCD comic information. Status code {resp.status}")
+
+    @command(name="xkcd")
+    async def fetch_xkcd_comics(self, ctx: Context, comic: Optional[str]) -> None:
+        """
+        Getting an xkcd comic's information along with the image.
+
+        To get a random comic, don't type any number as an argument. To get the latest, type 'latest'.
+        """
+        embed = Embed(title=f"XKCD comic '{comic}'")
+
+        embed.colour = Colours.soft_red
+
+        if comic and (comic := re.match(COMIC_FORMAT, comic)) is None:
+            embed.description = "Comic parameter should either be an integer or 'latest'."
+            await ctx.send(embed=embed)
+            return
+
+        comic = randint(1, self.latest_comic_info['num']) if comic is None else comic.group(0)
+
+        if comic == "latest":
+            info = self.latest_comic_info
+        else:
+            async with self.bot.http_session.get(f"{BASE_URL}/{comic}/info.0.json") as resp:
+                if resp.status == 200:
+                    info = await resp.json()
+                else:
+                    embed.title = f"XKCD comic #{comic}"
+                    embed.description = f"{resp.status}: Could not retrieve xkcd comic #{comic}."
+                    log.debug(f"Retrieving xkcd comic #{comic} failed with status code {resp.status}.")
+                    await ctx.send(embed=embed)
+                    return
+
+        embed.title = f"XKCD comic #{info['num']}"
+
+        if info["img"][-3:] in ("jpg", "png", "gif"):
+            embed.set_image(url=info["img"])
+            date = f"{info['year']}/{info['month']}/{info['day']}"
+            embed.set_footer(text=f"{date} - #{info['num']}, \'{info['safe_title']}\'")
+            embed.colour = Colours.soft_green
+        else:
+            embed.description = (
+                "The selected comic is interactive, and cannot be displayed within an embed.\n"
+                f"Comic can be viewed [here](https://xkcd.com/{info['num']})."
+            )
+
+        await ctx.send(embed=embed)
+
+
+def setup(bot: Bot) -> None:
+    """Loading the XKCD cog."""
+    bot.add_cog(XKCD(bot))