from random import choice

import discord
from discord.ext import commands

from bot.bot import Bot

HTTP_DOG_URL = "https://httpstatusdogs.com/img/{code}.jpg"
HTTP_CAT_URL = "https://http.cat/{code}.jpg"
STATUS_TEMPLATE = '**Status: {code}**'
ERR_404 = 'Unable to find status Floof for {code}.'
ERR_UNKNOWN = 'Error attempting to retrieve status Floof for {code}.'


class HTTPStatusCodes(commands.Cog):
    """
    Fetch an image depicting HTTP status codes as a dog or a cat.

    If neither animal is selected a cat or dog is chosen randomly for the given status code.
    """

    def __init__(self, bot: Bot):
        self.bot = bot

    @commands.group(name="http_status", aliases=("status", "httpstatus"), invoke_without_command=True)
    async def http_status_group(self, ctx: commands.Context, code: int) -> None:
        """Choose a cat or dog randomly for the given status code."""
        subcmd = choice((self.http_cat, self.http_dog))
        await subcmd(ctx, code)

    @http_status_group.command(name="cat")
    async def http_cat(self, ctx: commands.Context, code: int) -> None:
        """Assemble Cat URL and build Embed."""
        await self.build_embed(url=HTTP_CAT_URL.format(code=code), ctx=ctx, code=code)

    @http_status_group.command(name="dog")
    async def http_dog(self, ctx: commands.Context, code: int) -> None:
        """Assemble Dog URL and build Embed."""
        await self.build_embed(url=HTTP_DOG_URL.format(code=code), ctx=ctx, code=code)

    async def build_embed(self, url: str, ctx: commands.Context, code: int) -> None:
        """Attempt to build and dispatch embed. Append error message instead if something goes wrong."""
        async with self.bot.http_session.get(url, allow_redirects=False) as response:
            if 200 <= response.status <= 299:
                await ctx.send(embed=discord.Embed(
                    title=STATUS_TEMPLATE.format(code=code)).set_image(url=url))
            elif 404 == response.status:
                await ctx.send(embed=discord.Embed(
                    title=ERR_404.format(code=code)).set_image(url=url)
                )
            else:
                await ctx.send(embed=discord.Embed(
                    title=STATUS_TEMPLATE.format(code=code), footer=ERR_UNKNOWN.format(code=code))
                )


def setup(bot: Bot) -> None:
    """Load the HTTPStatusCodes cog."""
    bot.add_cog(HTTPStatusCodes(bot))