"""Discord bot for Strat-O-Matic rules Q&A."""

import logging
import discord
from discord import app_commands
from discord.ext import commands
import aiohttp
from typing import Optional

from .config import settings

logger = logging.getLogger(__name__)


class StratChatbotBot(commands.Bot):
    """Discord bot for the rules chatbot."""

    def __init__(self):
        """Initialize the bot with default intents."""
        intents = discord.Intents.default()
        intents.message_content = True
        super().__init__(command_prefix="!", intents=intents)

        self.api_base_url: Optional[str] = None
        self.session: Optional[aiohttp.ClientSession] = None

    async def setup_hook(self):
        """Set up the bot's HTTP session and sync commands."""
        self.session = aiohttp.ClientSession()
        # Sync slash commands with Discord
        if settings.discord_guild_id:
            guild = discord.Object(id=int(settings.discord_guild_id))
            self.tree.copy_global_to(guild=guild)
            await self.tree.sync(guild=guild)
            logger.info("Slash commands synced to guild %s", settings.discord_guild_id)
        else:
            await self.tree.sync()
            logger.info("Slash commands synced globally")

    async def close(self):
        """Cleanup on shutdown."""
        if self.session:
            await self.session.close()
        await super().close()

    async def query_chat_api(
        self,
        message: str,
        user_id: str,
        channel_id: str,
        conversation_id: Optional[str] = None,
        parent_message_id: Optional[str] = None,
    ) -> dict:
        """Send a request to the FastAPI chat endpoint."""
        if not self.session:
            raise RuntimeError("Bot HTTP session not initialized")

        payload = {
            "message": message,
            "user_id": user_id,
            "channel_id": channel_id,
            "conversation_id": conversation_id,
            "parent_message_id": parent_message_id,
        }

        async with self.session.post(
            f"{self.api_base_url}/chat",
            json=payload,
            timeout=aiohttp.ClientTimeout(total=120),
        ) as response:
            if response.status != 200:
                error_text = await response.text()
                logger.error(
                    "API returned %s for %s %s — body: %s",
                    response.status,
                    response.method,
                    response.url,
                    error_text,
                )
                raise RuntimeError(f"API error {response.status}")
            return await response.json()


bot = StratChatbotBot()


@bot.event
async def on_ready():
    """Called when the bot is ready."""
    if not bot.user:
        return
    logger.info("Bot logged in as %s (ID: %s)", bot.user, bot.user.id)
    logger.info("Ready to answer Strat-O-Matic rules questions!")


@bot.tree.command(
    name="ask", description="Ask a question about Strat-O-Matic league rules"
)
@app_commands.describe(
    question="Your rules question (e.g., 'Can a runner steal on a 2-2 count?')"
)
async def ask_command(interaction: discord.Interaction, question: str):
    """Handle /ask command."""
    await interaction.response.defer(ephemeral=False)

    try:
        result = await bot.query_chat_api(
            message=question,
            user_id=str(interaction.user.id),
            channel_id=str(interaction.channel_id),
            conversation_id=None,  # New conversation
            parent_message_id=None,
        )

        # Build response embed
        embed = discord.Embed(
            title="Rules Answer",
            description=result["response"][:4000],  # Discord limit
            color=discord.Color.blue(),
        )

        # Add cited rules if any
        if result.get("cited_rules"):
            embed.add_field(
                name="📋 Cited Rules",
                value=", ".join([f"`{rid}`" for rid in result["cited_rules"]]),
                inline=False,
            )

        # Add confidence indicator
        confidence = result.get("confidence", 0.0)
        if confidence < 0.4:
            embed.add_field(
                name="⚠️ Confidence",
                value=f"Low ({confidence:.0%}) - A human review has been requested",
                inline=False,
            )

        # Add conversation ID for follow-ups (full UUID so replies can be threaded)
        embed.set_footer(
            text=f"conv:{result['conversation_id']} | Reply to ask a follow-up"
        )

        await interaction.followup.send(embed=embed)

    except Exception as e:
        logger.error(
            "Error handling /ask from user %s: %s",
            interaction.user.id,
            e,
            exc_info=True,
        )
        await interaction.followup.send(
            embed=discord.Embed(
                title="❌ Error",
                description="Something went wrong while fetching your answer. Please try again later.",
                color=discord.Color.red(),
            )
        )


@bot.event
async def on_message(message: discord.Message):
    """Handle follow-up messages via reply."""
    # Ignore bot messages
    if message.author.bot:
        return

    # Only handle replies to the bot's messages
    if not message.reference or message.reference.message_id is None:
        return

    referenced = await message.channel.fetch_message(message.reference.message_id)

    # Check if the referenced message was from this bot
    if referenced.author != bot.user:
        return

    # Try to extract conversation ID from the footer
    embed = referenced.embeds[0] if referenced.embeds else None
    if not embed or not embed.footer:
        await message.reply(
            "❓ I couldn't find this conversation. Please use `/ask` to start a new question.",
            mention_author=True,
        )
        return

    footer_text = embed.footer.text or ""
    if "conv:" not in footer_text:
        await message.reply(
            "❓ Could not determine conversation. Use `/ask` to start fresh.",
            mention_author=True,
        )
        return

    # Extract full conversation UUID from "conv:<uuid> | ..." format
    try:
        conversation_id = footer_text.split("conv:")[1].split(" ")[0].strip()
    except (IndexError, AttributeError):
        await message.reply(
            "❓ Could not parse conversation ID. Use `/ask` to start fresh.",
            mention_author=True,
        )
        return

    # Get parent message ID (the original answer message)
    parent_message_id = str(referenced.id)

    # Send a loading placeholder and replace it with the real answer when ready
    loading_msg = await message.reply(
        "🔍 Looking into that follow-up...", mention_author=True
    )

    try:
        result = await bot.query_chat_api(
            message=message.content,
            user_id=str(message.author.id),
            channel_id=str(message.channel.id),
            conversation_id=conversation_id,
            parent_message_id=parent_message_id,
        )

        response_embed = discord.Embed(
            title="Follow-up Answer",
            description=result["response"][:4000],
            color=discord.Color.green(),
        )

        if result.get("cited_rules"):
            response_embed.add_field(
                name="📋 Cited Rules",
                value=", ".join([f"`{rid}`" for rid in result["cited_rules"]]),
                inline=False,
            )

        if result.get("confidence", 0.0) < 0.4:
            response_embed.add_field(
                name="⚠️ Confidence",
                value="Low - Human review requested",
                inline=False,
            )

        # Carry the conversation ID forward so further replies stay in the same thread
        response_embed.set_footer(
            text=f"conv:{result['conversation_id']} | Reply to ask a follow-up"
        )

        await loading_msg.edit(content=None, embed=response_embed)

    except Exception as e:
        logger.error(
            "Error handling follow-up from user %s in channel %s: %s",
            message.author.id,
            message.channel.id,
            e,
            exc_info=True,
        )
        await loading_msg.edit(
            content=None,
            embed=discord.Embed(
                title="❌ Error",
                description="Something went wrong while processing your follow-up. Please try again later.",
                color=discord.Color.red(),
            ),
        )


def run_bot(api_base_url: str = "http://localhost:8000"):
    """Entry point to run the Discord bot."""
    bot.api_base_url = api_base_url

    if not settings.discord_bot_token:
        logger.critical("DISCORD_BOT_TOKEN environment variable is required")
        exit(1)

    bot.run(settings.discord_bot_token)