"""Entry point for the Discord bot.

Usage:
    python main.py
"""

import asyncio
import os
import sys
import logging
import logging.handlers

# Add project root to path
project_root = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, project_root)

# Load environment variables
from dotenv import load_dotenv

load_dotenv()

# ─── Debug Mode ──────────────────────────────────────────────────────────────

DEBUG = os.getenv("APP_DEBUG", "0") == "1"

if DEBUG:
    print("[DEBUG] Debug mode is ENABLED. Logs will be printed.")
else:
    print("[DEBUG] Debug mode is DISABLED. Logs will NOT be printed.")

# ─── Logging Configuration ───────────────────────────────────────────────────

log_file = os.path.join(project_root, "bot.log")

# Create a rotating file handler (max 10 MB, keep 5 files)
file_handler = logging.handlers.RotatingFileHandler(
    log_file,
    maxBytes=10 * 1024 * 1024,  # 10 MB
    backupCount=5,
)
file_handler.setLevel(logging.DEBUG)
file_handler.setFormatter(logging.Formatter(
    "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
))

# Console handler (only when DEBUG is enabled)
console_handler = logging.StreamHandler(sys.stdout)
console_handler.setLevel(logging.DEBUG if DEBUG else logging.WARNING)
console_handler.setFormatter(logging.Formatter(
    "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
))

# Root logger
root_logger = logging.getLogger()
root_logger.addHandler(file_handler)
root_logger.addHandler(console_handler)
root_logger.setLevel(logging.DEBUG if DEBUG else logging.WARNING)

# Suppress noisy third-party logs
logging.getLogger("discord").setLevel(logging.DEBUG if DEBUG else logging.INFO)
logging.getLogger("discord.http").setLevel(logging.DEBUG if DEBUG else logging.WARNING)
logging.getLogger("discord.gateway").setLevel(logging.DEBUG if DEBUG else logging.WARNING)
logging.getLogger("discord.utils").setLevel(logging.DEBUG if DEBUG else logging.WARNING)
logging.getLogger("discord.app_commands").setLevel(logging.DEBUG if DEBUG else logging.WARNING)
logging.getLogger("discord.ext.commands").setLevel(logging.DEBUG if DEBUG else logging.WARNING)
logging.getLogger("discord.errors").setLevel(logging.DEBUG if DEBUG else logging.WARNING)
logging.getLogger("discord.client").setLevel(logging.DEBUG if DEBUG else logging.WARNING)

# ─── Logging Configuration ───────────────────────────────────────────────────

# Configure logging
logging.basicConfig(
    level=logging.DEBUG if DEBUG else logging.WARNING,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
    handlers=[file_handler, console_handler],
)

logger = logging.getLogger(__name__)


import discord
from discord.ext import commands
from discord.app_commands import Command as AppCommand, CommandTree

from handlers.gif_emotes import setup as setup_gif_emotes
from handlers.reactions import setup as setup_reactions
from handlers.voice import setup as setup_voice
from cogs.admin import setup as setup_admin
from commands.ping import ping, info
from commands.hello import hello
from commands.emoji import emoji, app_emoji
from commands.admin import upload_emoji, list_emojis, delete_emoji


# ─── Bot Setup ───────────────────────────────────────────────────────────────

intents = discord.Intents.default()
intents.message_content = True
intents.members = True

bot = commands.Bot(
    command_prefix="!",
    intents=intents,
)

tree: CommandTree = bot.tree

# ─── Slash Commands ──────────────────────────────────────────────────────────

# Register slash commands from modules
tree.add_command(AppCommand(name="ping", callback=ping, description="Check bot latency."))
tree.add_command(AppCommand(name="info", callback=info, description="Show bot information."))
tree.add_command(AppCommand(name="hello", callback=hello, description="Say hello to someone."))
tree.add_command(AppCommand(name="emoji", callback=emoji, description="Send a custom emoji by name."))
tree.add_command(AppCommand(name="app-emoji", callback=app_emoji, description="Fetch an app-owned emoji by ID."))
tree.add_command(AppCommand(name="upload-emoji", callback=upload_emoji, description="Upload a custom emoji to the guild."))
tree.add_command(AppCommand(name="list-emojis", callback=list_emojis, description="List all custom emojis in the guild."))
tree.add_command(AppCommand(name="delete-emoji", callback=delete_emoji, description="Delete a custom emoji."))

# ─── Prefix Commands ─────────────────────────────────────────────────────────

@bot.command(name="ping", description="Check bot latency.")
async def ping_command(ctx: commands.Context) -> None:
    """Check the bot's latency."""
    latency = round(bot.latency * 1000)
    await ctx.send(f"Pong! Latency: {latency}ms")

@bot.command(name="info", description="Show bot information.")
async def info_command(ctx: commands.Context) -> None:
    """Show bot information."""
    await ctx.send(
        f"**{ctx.guild.name if ctx.guild else 'DM'}**\n"
        f"Bot: `{bot.user.name}` (ID: {bot.user.id})\n"
        f"Latency: `{bot.latency:.3f}s`"
    )

@bot.command(name="hello", description="Say hello to someone.")
async def hello_command(ctx: commands.Context, name: str = "World") -> None:
    """Say hello to someone."""
    await ctx.send(f"Hello, {name}!")

@bot.command(name="list-commands", description="List all available commands.")
async def list_commands(ctx: commands.Context) -> None:
    """List all available commands."""
    cmds = list(bot.commands.values())
    cmd_list = []
    for cmd in cmds:
        cmd_list.append(f"  `{cmd.name}` — {cmd.description}")

    await ctx.send(
        f"**{bot.user.name} — Command List**\n\n"
        + "\n".join(cmd_list)
    )

# ─── Event Handlers ──────────────────────────────────────────────────────────

@bot.event
async def on_ready() -> None:
    """Entry point after successful login."""
    assert bot.user is not None
    print(f"Logged in as {bot.user} (ID: {bot.user.id})")
    print(f"Bot is running with {len(bot.guilds)} guilds")

    # Sync slash commands
    await tree.sync()
    print("Slash commands synced.")

    # Register handlers
    await setup_gif_emotes(bot)
    await setup_reactions(bot)
    await setup_voice(bot)
    await setup_admin(bot)

    print("All handlers registered.")


@bot.event
async def on_command_error(ctx: commands.Context, error: commands.CommandError) -> None:
    """Global error handler for all commands."""
    logger.debug(f"Command error for {ctx.author.name} ({ctx.author.id}): {error}")
    if isinstance(error, commands.CommandNotFound):
        await ctx.send("Command not found. Type `!list-commands` for a list of commands.")
    elif isinstance(error, commands.CheckFailure):
        await ctx.send("You do not have permission to use this command.")
    elif isinstance(error, commands.MissingPermissions):
        await ctx.send("You don't have permission to use this command.")
    elif isinstance(error, commands.MissingRequiredArgument):
        await ctx.send(f"Missing argument: {error.param.name}.")
    elif isinstance(error, commands.BadArgument):
        await ctx.send(f"Bad argument: {error.argument}.")
    elif isinstance(error, commands.CommandOnCooldown):
        remaining = int(error.retry_after)
        await ctx.send(
            f"This command is on cooldown. Try again in {remaining} seconds."
        )
    else:
        await ctx.send(f"An error occurred: {error}")


@bot.event
async def on_message(message: discord.Message) -> None:
    """Handle text messages sent in channels (prefix commands)."""
    # Ignore bot's own messages
    if message.author == bot.user:
        return

    # Ignore messages in DMs
    if message.guild is None:
        return

    # Call bot.process_commands() — this handles PREFIX COMMANDS
    # Note: In discord.py 2.7.x, process_commands() is a coroutine
    # and MUST be awaited.
    await bot.process_commands(message)


@bot.event
async def on_voice_state_update(
    member: discord.Member,
    before: discord.VoiceState,
    after: discord.VoiceState,
) -> None:
    """Handle voice state changes."""
    if after.channel_id is None and before.channel_id is not None:
        print(f"{member.name} left voice channel.")
    elif after.channel_id is not None and before.channel_id is None:
        print(f"{member.name} joined voice channel.")


# ─── Entry Point ─────────────────────────────────────────────────────────────

def main() -> None:
    """Run the bot."""
    token = os.getenv("DISCORD_TOKEN")
    if not token:
        print("Error: DISCORD_TOKEN environment variable is not set.")
        print("Create a .env file with your Discord bot token.")
        sys.exit(1)

    asyncio.run(bot.start(token))


if __name__ == "__main__":
    main()