import os
import discord
from discord.ext import commands
from discord import app_commands
import random as random_module
import typing  # Need this for Optional

# Cache to store uploaded file URLs (local to this cog)
file_url_cache = {}


class RandomCog(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

    # Updated _random_logic
    async def _random_logic(
        self, interaction_or_ctx, hidden: bool = False
    ) -> typing.Optional[str]:
        """Core logic for the random command. Returns an error message string or None if successful."""
        # NSFW Check
        is_nsfw_channel = False
        channel = interaction_or_ctx.channel
        if isinstance(channel, discord.TextChannel) and channel.is_nsfw():
            is_nsfw_channel = True
        elif isinstance(
            channel, discord.DMChannel
        ):  # DMs are considered NSFW for this purpose
            is_nsfw_channel = True

        if not is_nsfw_channel:
            # Return error message directly, ephemeral handled by caller
            return "This command can only be used in age-restricted (NSFW) channels or DMs."

        directory = os.getenv("UPLOAD_DIRECTORY")
        if not directory:
            return "UPLOAD_DIRECTORY is not set in the .env file."
        if not os.path.isdir(directory):
            return (
                "The specified UPLOAD_DIRECTORY does not exist or is not a directory."
            )

        files = [
            f
            for f in os.listdir(directory)
            if os.path.isfile(os.path.join(directory, f))
        ]
        if not files:
            return "The specified directory is empty."

        # Attempt to send a random file, handling potential size issues
        original_files = list(files)  # Copy for checking if all files failed
        while files:
            chosen_file_name = random_module.choice(files)
            file_path = os.path.join(directory, chosen_file_name)

            # Check cache first
            if chosen_file_name in file_url_cache:
                # For interactions, defer if not already done, using the hidden flag
                if (
                    not isinstance(interaction_or_ctx, commands.Context)
                    and not interaction_or_ctx.response.is_done()
                ):
                    await interaction_or_ctx.response.defer(
                        ephemeral=hidden
                    )  # Defer before sending cached URL
                # Send cached URL
                if isinstance(interaction_or_ctx, commands.Context):
                    await interaction_or_ctx.reply(
                        file_url_cache[chosen_file_name]
                    )  # Prefix commands can't be ephemeral
                else:
                    await interaction_or_ctx.followup.send(
                        file_url_cache[chosen_file_name], ephemeral=hidden
                    )
                return None  # Indicate success

            try:
                # Determine how to send the file based on context/interaction
                if isinstance(interaction_or_ctx, commands.Context):
                    message = await interaction_or_ctx.reply(
                        file=discord.File(file_path)
                    )  # Use reply for context
                else:  # It's an interaction
                    # Interactions need followup for files after defer()
                    if not interaction_or_ctx.response.is_done():
                        await interaction_or_ctx.response.defer(
                            ephemeral=hidden
                        )  # Defer before sending file
                    # Send file ephemerally if hidden is True
                    message = await interaction_or_ctx.followup.send(
                        file=discord.File(file_path), ephemeral=hidden
                    )

                # Cache the URL if successfully sent
                if message and message.attachments:
                    file_url_cache[chosen_file_name] = message.attachments[0].url
                    # Success, no further message needed
                    return None
                else:
                    # Should not happen if send succeeded, but handle defensively
                    files.remove(chosen_file_name)
                    print(
                        f"Warning: File {chosen_file_name} sent but no attachment URL found."
                    )  # Log warning
                    continue

            except discord.HTTPException as e:
                if e.code == 40005:  # Request entity too large
                    print(f"File too large: {chosen_file_name}")
                    files.remove(chosen_file_name)
                    continue  # Try another file
                else:
                    print(f"HTTP Error sending file: {e}")
                    # Return error message directly, ephemeral handled by caller
                    return f"Failed to upload the file due to an HTTP error: {e}"
            except Exception as e:
                print(f"Generic Error sending file: {e}")
                # Return error message directly, ephemeral handled by caller
                return f"An unexpected error occurred while uploading the file: {e}"

        # If loop finishes without returning/sending, all files were too large
        # Return error message directly, ephemeral handled by caller
        return "All files in the directory were too large to upload."

    # --- Prefix Command ---
    @commands.command(name="random")
    async def random(self, ctx: commands.Context):
        """Upload a random NSFW image from the configured directory."""
        # Call _random_logic, hidden is False by default and irrelevant for prefix
        response = await self._random_logic(ctx)
        if response is not None:
            await ctx.reply(response)

    # --- Slash Command ---
    # Updated signature and logic
    @app_commands.command(
        name="random",
        description="Upload a random NSFW image from the configured directory",
    )
    @app_commands.describe(
        hidden="Set to True to make the response visible only to you (default: False)"
    )
    async def random_slash(
        self, interaction: discord.Interaction, hidden: bool = False
    ):
        """Slash command version of random."""
        # Pass hidden parameter to logic
        response = await self._random_logic(interaction, hidden=hidden)
        # If response is None, the logic already sent the file via followup/deferral

        if response is not None:  # An error occurred
            # Ensure interaction hasn't already been responded to or deferred
            if not interaction.response.is_done():
                # Send error message ephemerally if hidden is True OR if it's the NSFW channel error
                ephemeral_error = hidden or response.startswith(
                    "This command can only be used"
                )
                await interaction.response.send_message(
                    response, ephemeral=ephemeral_error
                )
            else:
                # If deferred, use followup. Send ephemerally based on hidden flag.
                await interaction.followup.send(response, ephemeral=hidden)


async def setup(bot):
    await bot.add_cog(RandomCog(bot))