import asyncio
import random

import discord
from discord import app_commands
from discord.ext import commands

import lib.format
from lib.client import Luminara
from lib.const import CONST
from lib.exceptions import LumiException
from ui.embeds import Builder

PREDICTION_MAPPING = {
    "h": "heads",
    "head": "heads",
    "heads": "heads",
    "t": "tails",
    "tail": "tails",
    "tails": "tails",
}

COIN_FLIP_DELAY = 0.5  # seconds


class ActiveCoinflips:
    def __init__(self):
        self._flips: set[int] = set()

    def add(self, user_id: int) -> bool:
        if user_id in self._flips:
            return False
        self._flips.add(user_id)
        return True

    def remove(self, user_id: int) -> None:
        self._flips.discard(user_id)


class Coinflip(commands.Cog):
    def __init__(self, bot: Luminara) -> None:
        self.bot: Luminara = bot
        self.coinflip.usage = lib.format.generate_usage(self.coinflip)
        self.active_coinflips = ActiveCoinflips()

    @commands.command(
        name="coinflip",
        aliases=["cf"],
    )
    @commands.guild_only()
    async def coinflip(
        self,
        ctx: commands.Context[Luminara],
        *,
        prediction: str | None = None,
    ) -> None:
        """
        Flip a coin. Optionally predict the outcome.

        Parameters
        ----------
        ctx : commands.Context[Luminara]
            The context of the command.
        prediction : str, optional
            The predicted outcome ('heads', 'h', 'tails', or 't').
        """
        await self._coinflip(ctx, prediction)

    @app_commands.command(name="coinflip", description="Flip a coin. Optionally predict the outcome.")
    @app_commands.guild_only()
    @app_commands.choices(
        prediction=[
            app_commands.Choice(name="Heads", value="heads"),
            app_commands.Choice(name="Tails", value="tails"),
        ],
    )
    async def coinflip_slash(
        self,
        interaction: discord.Interaction,
        prediction: app_commands.Choice[str] | None = None,
    ) -> None:
        """
        Flip a coin. Optionally predict the outcome.

        Parameters
        ----------
        interaction : discord.Interaction
            The interaction of the command.
        prediction : app_commands.Choice[str], optional
            The predicted outcome ('heads' or 'tails').
        """
        await self._coinflip(interaction, prediction.value if prediction else None)

    async def _coinflip(self, ctx: commands.Context[Luminara] | discord.Interaction, prediction: str | None) -> None:
        if isinstance(ctx, commands.Context):
            author = ctx.author
            reply = ctx.reply
        else:
            author = ctx.user
            reply = ctx.followup.send

        if not self.active_coinflips.add(author.id):
            raise LumiException(CONST.STRINGS["error_already_flipping_coin_description"])

        try:
            result = random.choice(["heads", "tails"])

            if prediction:
                prediction = PREDICTION_MAPPING.get(prediction.lower())
                if not prediction:
                    raise LumiException(CONST.STRINGS["coinflip_invalid_prediction_description"])

            flip_embed = Builder.create_embed(
                Builder.INFO,
                user_name=author.name,
                author_text=CONST.STRINGS["coinflip_flipping_author"],
                description=CONST.STRINGS["coinflip_flipping_description"],
            )

            if isinstance(ctx, commands.Context):
                flip_message = await reply(embed=flip_embed)
            else:
                await ctx.response.send_message(embed=flip_embed)
                flip_message = await ctx.original_response()

            # Add a short delay before starting the coin flip animation
            await asyncio.sleep(COIN_FLIP_DELAY)

            if isinstance(flip_message, discord.Message):
                await self._animate_coin_flip(flip_message, author.name)

            if prediction:
                predicted_correctly = prediction == result

                embed_type = Builder.SUCCESS if predicted_correctly else Builder.ERROR
                author_text = CONST.STRINGS[
                    "coinflip_correct_prediction_author" if predicted_correctly else "coinflip_wrong_prediction_author"
                ]
                description = CONST.STRINGS[
                    "coinflip_correct_prediction_description"
                    if predicted_correctly
                    else "coinflip_wrong_prediction_description"
                ].format(result)

                embed = Builder.create_embed(
                    embed_type,
                    user_name=author.name,
                    author_text=author_text,
                    description=description,
                )
            else:
                embed = Builder.create_embed(
                    Builder.INFO,
                    user_name=author.name,
                    author_text=CONST.STRINGS["coinflip_result_author"],
                    description=CONST.STRINGS["coinflip_result_description"].format(result),
                )

            if flip_message is not None:
                await flip_message.edit(embed=embed)
        finally:
            self.active_coinflips.remove(author.id)

    async def _animate_coin_flip(self, flip_message: discord.Message, author_name: str) -> None:
        animations = [
            CONST.STRINGS["coinflip_flipping_animation_1"],
            CONST.STRINGS["coinflip_flipping_animation_2"],
            CONST.STRINGS["coinflip_flipping_animation_3"],
        ]
        for animation in animations:
            flip_embed = Builder.create_embed(
                Builder.INFO,
                user_name=author_name,
                author_text=CONST.STRINGS["coinflip_flipping_author"],
                description=animation,
            )
            await flip_message.edit(embed=flip_embed)
            await asyncio.sleep(COIN_FLIP_DELAY)


async def setup(bot: Luminara) -> None:
    await bot.add_cog(Coinflip(bot))